WO2022094900A1

WO2022094900A1 - Single long-distance pipe-based low-temperature waste heat heating system

Info

Publication number: WO2022094900A1
Application number: PCT/CN2020/126951
Authority: WO
Inventors: 付林; 王明卿; 吴彦廷; 张世钢; 赵玺灵
Original assignee: 清华大学; 北京清建能源技术有限公司
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2022-05-12

Abstract

A single long-distance pipe-based low-temperature waste heat heating system, comprising: a low-temperature waste heat recovery unit and a low-temperature heat source, wherein the low-temperature heat source enters the low-temperature waste heat recovery unit and transfers heat with a heat transfer medium conveyed to the low-temperature waste heat recovery unit; the heat transfer medium after heat transfer enters a hydrothermal heat exchange unit by means of a single long-distance pipe, a primary network water supply is obtained by transferring heat with primary network backwater conveyed to the hydrothermal heat exchange unit. The primary network water supply transfers heat to secondary network backwater by means of different forms of heat exchange heat units, or the primary network water supply is directly conveyed to a user for use. According to the present invention, by means of the heat transfer medium located near the low-temperature heat source, the heat of the low-temperature heat source is transferred to the heat transfer medium, the heated heat transfer medium is then conveyed to a city for use by means of the single long-distance pipe, the energy density of low-temperature waste heat conveyance is improved, and at the same time, construction investments made to a heating network are reduced, and the long-distance conveying of the low-temperature waste heat is further made feasible.

Description

一种基于单管长输的低温余热供热***A low-temperature waste heat heating system based on single-pipe long-distance transmission

技术领域technical field

本发明涉及低温余热回收技术领域，特别涉及一种基于单管长输的低温余热供热***。The invention relates to the technical field of low-temperature waste heat recovery, in particular to a low-temperature waste heat heating system based on single-pipe long-distance transmission.

背景技术Background technique

近年来，为了实现低碳经济的发展以及营造清洁的生活环境，大温差长距离供热技术作为一种清洁供热技术得到了广泛的应用，使得大规模的电厂余热得以回收的同时还能够长距离输送至城市负荷区，解决了城市的雾霾问题。In recent years, in order to realize the development of a low-carbon economy and create a clean living environment, the long-distance heating technology with large temperature difference has been widely used as a clean heating technology. The distance is transported to the urban load area, which solves the urban haze problem.

而为了应对气候危机和实现可持续发展，近年来各个国家又相继提出更高的目标——“碳中和”，作为耗能大户的供热领域也就被提出了更高的要求。例如某国家首都为了实现该目标，做出了在一定年限内逐步关闭燃煤电厂的决定，给城市供热带来新的巨大挑战，城市供热必须要寻找新的热源替代。而位于城市周边的工业余热是一种量大但温度较低的清洁热源，如果能够将其利用起来，则可以使资源得到更有效利用的同时，解决了城市供热的问题。In order to cope with the climate crisis and achieve sustainable development, in recent years, various countries have successively put forward higher goals - "carbon neutrality", and the heating field, which is a large energy consumer, has also been put forward higher requirements. For example, in order to achieve this goal, the capital of a certain country has made a decision to gradually close coal-fired power plants within a certain number of years, which brings new and huge challenges to urban heating, and urban heating must find new heat sources to replace. The industrial waste heat located around the city is a clean heat source with a large amount but a low temperature. If it can be used, it can make the resources more effectively used and solve the problem of urban heating.

发明内容SUMMARY OF THE INVENTION

(一)发明目的(1) Purpose of the invention

本发明的目的是提供一种基于单管长输的低温余热供热***，通过借助位于低温热源附近的输热介质，将低温热源的热量传递给输热介质，再通过长距离单管将升温后的输热介质输送给城市使用，实现了低温余热的长距离输送。The purpose of the present invention is to provide a low-temperature waste heat heating system based on single-pipe long-distance transmission, which transfers the heat of the low-temperature heat source to the heat-transport medium by means of a heat-transport medium located near the low-temperature heat source, and then increases the temperature through a long-distance single-pipe The latter heat transfer medium is transported to the city for use, realizing long-distance transport of low-temperature waste heat.

(二)技术方案(2) Technical solutions

为解决上述问题，根据本发明的一个方面,本发明提供了一种基于单管长输的低温余热供热***，包括：低温余热回收单元；以及设置在所述低温余热回收单元内的低温热源输送管道和输热介质输送管道，所述低温热源输送管道内的低温热源与所述输热介质输送管道内的输热介质在所述低温余热回收单元内进行热传递；所述低温热源和所述输热介质均位于城市边缘的同一位置；长输单管，所述长输单管的始端与所述输热介质输送管道的出口连通，所述长输单管的末端与水热换热单元连通，用于将热传递后的所述输热介质输送至所述水热换热单元中；一次网回水管道，用于将一次网回水输送至所述水热换热单元中，使得热传递后的所述输热介质与所述一次网回水进行热传递，得到一次网供水；一次网供水管道，所述一次网供水管道的输入口与所述一次网回水管道的输出口连通，所述一次网供水管道的输出口与换热热力单元连通，用于将所述一次网供水输送至所述换热热力单元中；所述换热热力单元中还设有二次网回水管道，用于输送二次网回水，所述一次网供水与所述二次网回水在所述换热热力单元中进行热传递后得到的二次网供水将通过二次网供水管道输送给用户；或一次网供水管道，用于将所述一次网供水直接输送至用户。In order to solve the above problems, according to one aspect of the present invention, the present invention provides a low-temperature waste heat heating system based on single-pipe long-distance transmission, comprising: a low-temperature waste heat recovery unit; and a low-temperature heat source arranged in the low-temperature waste heat recovery unit A conveying pipeline and a heat conveying medium conveying pipeline, the low temperature heat source in the low temperature heat source conveying pipeline and the heat conveying medium in the heat conveying medium conveying pipeline conduct heat transfer in the low temperature waste heat recovery unit; the low temperature heat source and all The heat transport medium is located at the same position on the edge of the city; the long-distance transport single pipe, the beginning end of the long-distance transport single pipe is communicated with the outlet of the heat transport medium transport pipe, and the end of the long-distance transport single pipe exchanges heat with water and heat The unit is connected to transport the heat transfer medium after heat transfer to the hydrothermal heat exchange unit; the primary net return water pipeline is used to transport the primary net return water to the hydrothermal heat exchange unit, Make the heat transfer medium after heat transfer and the primary network return water to carry out heat transfer to obtain the primary network water supply; the primary network water supply pipeline, the input port of the primary network water supply pipeline and the output of the primary network return water pipeline The outlet of the primary network water supply pipeline is communicated with the heat exchange thermal unit, which is used to transport the water supply from the primary network to the heat exchange thermal unit; the heat exchange thermal unit is also provided with a secondary network The return water pipeline is used to transport the return water of the secondary network. The water supply of the secondary network obtained after the heat transfer between the water supply of the primary network and the return water of the secondary network in the heat exchange thermal unit will be supplied through the secondary network. The pipeline is delivered to the user; or the primary network water supply pipeline is used to directly deliver the primary network water supply to the user.

可选的，所述低温热源包括工业冷却循环液体、工业冷却循环气体或工业排放的高温污水。Optionally, the low-temperature heat source includes industrial cooling circulating liquid, industrial cooling circulating gas or high-temperature sewage discharged by industry.

可选的，所述输热介质包括河流、湖泊、水库、大海、污水处理厂或自来水厂中的液体或者气体。Optionally, the heat transfer medium includes liquid or gas in rivers, lakes, reservoirs, seas, sewage treatment plants or waterworks.

可选的，所述低温余热回收单元包括：电动热泵和换热器；所述电动热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述电动热泵；所述低温热源输送管道包括第一低温热源输送管道和第二低温热源输送管道；所述第一低温热源输送管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；所述第二低温热源输送管道进入所述电动热泵的另一侧，一次热传递后的所述输热介质与所述第二低温热源输送管道中的低温热源继续进行二次热传递。Optionally, the low-temperature waste heat recovery unit includes: an electric heat pump and a heat exchanger; one side of the electric heat pump and one side of the heat exchanger are communicated through a pipeline, and the heat transfer medium enters sequentially through the pipeline. the heat exchanger and the electric heat pump; the low-temperature heat source transportation pipeline includes a first low-temperature heat source transportation pipeline and a second low-temperature heat source transportation pipeline; the first low-temperature heat source transportation pipeline enters the other side of the heat exchanger , conduct a heat transfer with the heat transfer medium; the second low-temperature heat source transportation pipeline enters the other side of the electric heat pump, and the heat transfer medium and the second low-temperature heat source transportation pipeline after the first heat transfer The low-temperature heat source continues to carry out secondary heat transfer.

可选的，所述水热换热单元包括：电动热泵、换热器和燃气锅炉；所述电动热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述电动热泵；所述一次网回水管道包括第一一次网回水管道和第二一次网回水管道；所述第二一次网回水管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；所述第一一次网回水管道进入所述电动热泵的另一侧，一次热传递后的所述输热介质与所述第一一次网回水管道中的一次网回水继续进行二次热传递；热传递后的第二一次网回水与第一一次网回水汇合后进入所述燃气锅炉中继续进行加热。Optionally, the water-heat heat exchange unit includes: an electric heat pump, a heat exchanger and a gas boiler; one side of the electric heat pump and one side of the heat exchanger are connected through a pipeline, and the heat transfer medium passes through the The pipeline enters the heat exchanger and the electric heat pump in sequence; the primary network return pipeline includes a first primary network return pipeline and a second primary network return pipeline; the second primary network return water The pipeline enters the other side of the heat exchanger, and conducts primary heat transfer with the heat transfer medium; the first primary network return water pipeline enters the other side of the electric heat pump, and the The heat transfer medium and the primary network return water in the first primary network return water pipeline continue to carry out secondary heat transfer; the second primary network return water after heat transfer and the first primary network return water merge into the Heating continues in the gas boiler.

可选的，所述水热换热单元包括：燃气热泵和换热器；所述燃气热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述燃气热泵；所述一次网回水管道包括第一一次网回水管道和第二一次网回水管道；所述第二一次网回水管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；所述第一一次网回水管道进入所述燃气热泵的另一侧，一次热传递后的所述输热介质与所述第一一次网回水管道中的一次网回水继续进行二次热传递；热传递后的第二一次网回水与第一一次网回水汇合。Optionally, the water-heat heat exchange unit includes: a gas-fired heat pump and a heat exchanger; one side of the gas-fired heat pump and one side of the heat exchanger are communicated through a pipeline, and the heat transfer medium is sequentially passed through the pipeline. Enter the heat exchanger and the gas heat pump; the primary network return pipeline includes the first primary network return pipeline and the second primary network return pipeline; the second primary network return pipeline enters the On the other side of the heat exchanger, a heat transfer is performed with the heat transfer medium; the first primary network return pipe enters the other side of the gas heat pump, and the heat transfer medium after the first heat transfer The secondary heat transfer is continued with the primary mesh return water in the first primary mesh return water pipeline; the second primary mesh return water after heat transfer merges with the first primary mesh return water.

可选的，还包括：第一换热热力单元；所述第一换热热力单元包括吸收式换热器；所述一次网供水管道设于所述吸收式换热器的一侧，所述二次网回水管道设于所述吸收式换热器的另一侧；所述水热换热单元输出的一次网供水通过所述一次网供水管道进入所述吸收式换热器，与所述二次网回水管道中的二次网回水进行热传递；热传递后的所述一次网供水输出所述吸收式换热器，重新进入所述水热换热单元进行循环加热。Optionally, it further includes: a first heat exchange thermal unit; the first heat exchange thermal unit includes an absorption heat exchanger; the primary network water supply pipeline is provided on one side of the absorption heat exchanger, and the The secondary network return water pipeline is arranged on the other side of the absorption heat exchanger; the water supply from the primary network output by the hydrothermal heat exchange unit enters the absorption heat exchanger through the primary network water supply pipeline, and is connected to the other side of the absorption heat exchanger. The secondary network return water in the secondary network return pipeline conducts heat transfer; the water supplied from the primary network after the heat transfer is output to the absorption heat exchanger, and re-enters the hydrothermal heat exchange unit for circulating heating.

可选的，还包括：第二换热热力单元；所述第二换热热力单元包括燃气热泵；所述一次网供水管道设于所述燃气热泵的一侧，所述二次网回水管道设于所述燃气热泵的另一侧；所述水热换热单元输出的一次网供水通过所述一次网供水管道进入所述燃气热泵，与所述二次网回水管道中的二次网回水进行热传递；热传递后的所述一次网供水输出所述燃气热泵，重新进入所述水热换热单元进行循环加热。Optionally, it further includes: a second heat exchange heat unit; the second heat exchange heat unit includes a gas heat pump; the primary network water supply pipeline is provided on one side of the gas heat pump, and the secondary network water return pipeline Set on the other side of the gas-fired heat pump; the primary network water output from the water-heat heat exchange unit enters the gas-fired heat pump through the primary network water supply pipeline, and is connected with the secondary network in the secondary network return pipeline. The return water is used for heat transfer; the water from the primary network after the heat transfer is output to the gas heat pump, and re-enters the water-heat heat exchange unit for circulating heating.

可选的，还包括：第三换热热力单元；所述第三换热热力单元包括：电动热泵和换热器；所述电动热泵的一侧和所述换热器的一侧通过所述一次网供水管道连通，所述电动热泵的另一侧和所述换热器的另一侧均设置有所述二次网回水管道；所述水热换热单元输出的一次网供水通过所述一次网供水管道依次进入所述换热器、所述电动热泵，与所述二次网回水管道中的二次网回水进行热传递；热传递后的所述一次网供水输出所述电动热泵，重新进入所述水热换热单元进行循环加热。Optionally, it further includes: a third heat exchange thermal unit; the third heat exchange thermal unit includes: an electric heat pump and a heat exchanger; one side of the electric heat pump and one side of the heat exchanger pass through the The primary network water supply pipeline is connected, and the other side of the electric heat pump and the other side of the heat exchanger are provided with the secondary network return water pipeline; the primary network water supply output by the hydrothermal heat exchange unit passes through the The primary network water supply pipeline enters the heat exchanger and the electric heat pump in turn, and conducts heat transfer with the secondary network return water in the secondary network return water pipeline; the primary network water supply after heat transfer outputs the The electric heat pump re-enters the hydrothermal heat exchange unit for circulating heating.

可选的，还包括：第四换热热力单元；所述第四换热热力单元包括：电动热泵和吸收式换热器；所述电动热泵的一侧和所述吸收式换热器的一侧通过所述一次网供水管道连通，所述电动热泵的另一侧和所述吸收式换热器的另一侧均设置有二次网供水管道；所述水热换热单元输出的一次网供水通过所述一次网供水管道依次进入所述吸收式换热器、所述电动热泵，与所述二次网回水管道中的二次网回水进行热传递；热传递后的所述一次网供水输出所述电动热泵，重新进入所述水热换热单元进行循环加热。Optionally, it further includes: a fourth heat exchange thermal unit; the fourth heat exchange thermal unit includes: an electric heat pump and an absorption heat exchanger; one side of the electric heat pump and one side of the absorption heat exchanger The two sides are connected through the primary network water supply pipeline, and the other side of the electric heat pump and the other side of the absorption heat exchanger are both provided with a secondary network water supply pipeline; the primary network output by the water-heat heat exchange unit The water supply enters the absorption heat exchanger and the electric heat pump in sequence through the primary network water supply pipeline, and conducts heat transfer with the secondary network return water in the secondary network return water pipeline; the primary network after heat transfer The network water supply outputs the electric heat pump, and re-enters the water-heat heat exchange unit for circulating heating.

可选的，还包括：至少一个中继泵；所述中继泵设置于所述长输单管上，用于在输送所述输热介质时提供动力。Optionally, it also includes: at least one relay pump; the relay pump is arranged on the long-distance single pipe, and is used to provide power when the heat transfer medium is transported.

可选的，还包括：至少一个一次网循环泵；所述一次网循环泵设置于所述一次网回水管道和/或所述一次网供水管道上，用于在输送所述一次网回水和所述一次网供水时提供动力。Optionally, it also includes: at least one primary network circulating pump; the primary network circulating pump is arranged on the primary network return water pipeline and/or the primary network water supply pipeline, and is used for conveying the primary network return water. And the primary net provides power when water is supplied.

可选的，所述换热器包括板式换热器。Optionally, the heat exchanger includes a plate heat exchanger.

可选的，所述低温热源的初始温度在50°以下；所述输热介质的初始温度为0-10°。Optionally, the initial temperature of the low-temperature heat source is below 50°; the initial temperature of the heat transfer medium is 0-10°.

可选的，在所述低温余热回收单元内热传递后的所述输热介质的温度为50-80°；在所述水热换热单元内热传递后的所述输热介质的温度为15°以下。Optionally, the temperature of the heat transfer medium after heat transfer in the low-temperature waste heat recovery unit is 50-80°; the temperature of the heat transfer medium after heat transfer in the hydrothermal heat exchange unit is 15° the following.

可选的，在所述水热换热单元内热传递后得到的所述一次网供水的温度为80-130°；与所述一次网供水进行热传递后得到的二次网供水的温度为50°以上。Optionally, the temperature of the primary network water supply obtained after heat transfer in the hydrothermal heat exchange unit is 80-130°; the temperature of the secondary network water supply obtained after heat transfer with the primary network water supply is 50°C. ° above.

(三)有益效果(3) Beneficial effects

本发明的上述技术方案具有如下有益的技术效果：The above-mentioned technical scheme of the present invention has the following beneficial technical effects:

本发明通过借助位于低温热源附近的输热介质，将低温热源的热量传递给输热介质，再通过长距离单管将升温后的输热介质输送给城市使用；提高了低温余热输送的能量密度，减少了回水管道的建设，从而减少了近40％热网的投资建设，并且省去了回水管道的沿程阻力损失，减少了近50％水泵耗电量。The invention transfers the heat of the low-temperature heat source to the heat-transfer medium by means of the heat-transfer medium located near the low-temperature heat source, and then transfers the heated heat-transfer medium to the city through a long-distance single pipe; the energy density of the low-temperature waste heat transfer is improved. , reducing the construction of the return water pipeline, thereby reducing the investment and construction of the heating network by nearly 40%, and eliminating the resistance loss along the return water pipeline, reducing the power consumption of the pump by nearly 50%.

利用热源附近存在的河流、湖泊、水库或大海，或者污水处理厂及自来水厂等，将这些水作为热量输送的介质。实现了低温余热远距离输送的可行性，给燃煤电厂的关闭提出解决方案，给“零碳”***的构建提供一种技术路线。同时使得资源得到了非常有效的利用。Use the rivers, lakes, reservoirs or seas near the heat source, or sewage treatment plants and water plants, etc., to use these waters as heat transfer media. It realizes the feasibility of long-distance transmission of low-temperature waste heat, proposes a solution for the shutdown of coal-fired power plants, and provides a technical route for the construction of a "zero carbon" system. At the same time, resources are used very efficiently.

附图说明Description of drawings

图1是本发明提供的基于单管长输的低温余热供热***示意图；1 is a schematic diagram of a low-temperature waste heat heating system based on a single-pipe long-distance transmission provided by the present invention;

图2是本发明提供的低温余热回收单元100的示意图；2 is a schematic diagram of a low-temperature waste heat recovery unit 100 provided by the present invention;

图3是本发明提供的一实施例中水热换热单元200的示意图；3 is a schematic diagram of a hydrothermal heat exchange unit 200 in an embodiment provided by the present invention;

图4是本发明提供的另一实施例中水热换热单元200的示意图。FIG. 4 is a schematic diagram of a hydrothermal heat exchange unit 200 in another embodiment provided by the present invention.

附图标记：Reference number:

100-低温余热回收单元；200-水热换热单元；100-low temperature waste heat recovery unit; 200-hydrothermal heat exchange unit;

1-低温热源；2-主动力泵；3-输热介质摄取端；4-输热介质释放端；5-长输单管；6-中继泵；7-一次网循环泵；8-一次网；9-吸收式换热器；10-电动热泵；11-换热器；12-燃气热泵；13-二次网；14-燃气锅炉；1- low temperature heat source; 2- main power pump; 3- heat transfer medium intake end; 4- heat transfer medium release end; 5- long-distance single pipe; 6- relay pump; 7- primary network circulating pump; 8- primary Grid; 9-absorption heat exchanger; 10-electric heat pump; 11-heat exchanger; 12-gas heat pump; 13-secondary network; 14-gas boiler;

A-第一换热热力单元；B-第二换热热力单元；C-第三换热热力单元；D-第四换热热力单元；E-输送管道；F-电；G-燃气。A-the first heat-exchange thermal unit; B-the second heat-exchange thermal unit; C-the third heat-exchange thermal unit; D-the fourth heat-exchange thermal unit; E-transport pipeline; F-electricity; G-gas.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚明了，下面结合具体实施方式并参照附图，对本发明进一步详细说明。应该理解，这些描述只是示例性的，而并非要限制本发明的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要地混淆本发明的概念。In order to make the objectives, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

下面结合附图和实施例对本发明进行详细说明。The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

本发明提供了一种基于单管长输的低温余热供热***，图1是本发明提供的基于单管长输的低温余热供热***示意图。The present invention provides a low-temperature waste heat heating system based on single-pipe long-distance transmission. FIG. 1 is a schematic diagram of the low-temperature waste heat heating system based on single-pipe long-distance transmission provided by the present invention.

基于单管长输的低温余热供热***用于将有低温余热的工业冷却循环液体或工业冷却循环气体的热量传递给输热介质，或用于将工业排放的高温污水的热量传递给输热介质，再通过长距离单管将升温后的输热介质输送到城市边缘的水热换热单元200，与城市的一次网回水进行热传递，而热传递后降温的输热介质则被排放回江河湖泊或者水厂或市政供水管网。其中，工业冷却循环液体或工业冷却循环气***于城市边缘，而城市边缘附近存在河流、湖泊、水库、大海或存在污水处理厂、自来水厂等，因此这些位于城市边缘的海水、湖泊水、河水、污水等均可以作为输热介质。The low-temperature waste heat heating system based on single-pipe long-distance transmission is used to transfer the heat of industrial cooling circulating liquid or industrial cooling circulating gas with low-temperature waste heat to the heat transfer medium, or to transfer the heat of high-temperature sewage discharged from industry to the heat transfer medium. Then, the heated heat transfer medium is transported to the water-heat heat exchange unit 200 at the edge of the city through a long-distance single pipe, and the heat transfer is carried out with the return water of the city's primary network, and the cooled heat transfer medium after heat transfer is discharged. Back to rivers and lakes or water plants or municipal water supply network. Among them, the industrial cooling circulating liquid or the industrial cooling circulating gas is located at the edge of the city, and there are rivers, lakes, reservoirs, seas or sewage treatment plants, waterworks, etc. Sewage, etc. can be used as heat transfer medium.

位于城市边缘附近的工业余热是一种量大但温度较低的清洁热源，普遍来自炼钢、化工等工厂，而利用城市边缘的低温余热给城市供热，则需要敷设长距离输热管道。虽然工业余热量大，但是其温度低、能量密度低的特点，将会大大降低长距离输送热量的经济性。因此可以利用低温热源附近存在的河流、湖泊、水库、大海或者污水处理厂、自来水厂等，将这些水作为热量输送的介质。这些水由低温热源加热并通过热泵提高温度，提升能量密度后输送至城市负荷区进行热传递，热传递后介质水的温度将会降低至与取水源相同甚至更低的温度，之后便可将降温后的介质水排入河流、湖泊、水库或大海，不再返回热源厂。若采用纯水、自来水等作为输热介质，则降温后的介质水可直接进入城市的给水***，实现“热”和“水”的两种商品输出。The industrial waste heat near the city fringe is a clean heat source with a large amount but low temperature. It generally comes from steel-making, chemical and other factories. To use the low-temperature waste heat at the city fringe to supply heat to the city, long-distance heat transmission pipes need to be laid. Although the industrial waste heat is large, its low temperature and low energy density will greatly reduce the economy of long-distance heat transfer. Therefore, the rivers, lakes, reservoirs, seas, or sewage treatment plants, water plants, etc. existing near the low-temperature heat source can be used, and these waters can be used as the medium for heat transfer. The water is heated by a low-temperature heat source and raised by a heat pump. After increasing the energy density, it is transported to the urban load area for heat transfer. After the heat transfer, the temperature of the medium water will be reduced to the same or even lower temperature than that of the water source. The cooled medium water is discharged into rivers, lakes, reservoirs or the sea, and is no longer returned to the heat source plant. If pure water, tap water, etc. are used as the heat transfer medium, the cooled medium water can directly enter the city's water supply system to realize two commodity outputs of "heat" and "water".

上述方式提高了低温余热输送的能量密度，提高了长距离输送的经济性；同时长距离单管不需要再建设回水管道，大幅减少了热网的建设投资；也省去了回水管道的沿程阻力损失，减少了水泵耗电量，从而进一步实现低温余热长距离输送的可行性。The above method improves the energy density of low-temperature waste heat transportation and improves the economy of long-distance transportation; at the same time, the long-distance single pipe does not need to build a return water pipeline, which greatly reduces the construction investment of the heating network; it also saves the need for the return water pipeline. The resistance loss along the process reduces the power consumption of the pump, thereby further realizing the feasibility of long-distance transportation of low-temperature waste heat.

本发明提供的上述基于单管长输的低温余热供热***包括：低温余热回收单元100，低温余热回收单元100用于将低温热源1的余热传递给输热介质，最终起到回收低温热源1余热的作用。The above-mentioned low-temperature waste heat heating system based on single-pipe long-distance transmission provided by the present invention includes: a low-temperature waste heat recovery unit 100, and the low-temperature waste heat recovery unit 100 is used to transfer the waste heat of the low-temperature heat source 1 to the heat transfer medium, and finally recover the low-temperature heat source 1. effect of residual heat.

图2是本发明提供的低温余热回收单元100的示意图，请查看图2，低温余热回收单元100包括电动热泵10和换热器11。FIG. 2 is a schematic diagram of the low-temperature waste heat recovery unit 100 provided by the present invention. Please refer to FIG. 2 . The low-temperature waste heat recovery unit 100 includes an electric heat pump 10 and a heat exchanger 11 .

具体地，电动热泵10和换热器11的一侧通过输热介质输送管道连通，输热介质通过输热介质输送管道依次进入换热器11、电动热泵10。低温热源1为工业冷却循环水，被分成两股，一股通过第一低温热源输送管道进入换热器11的另一侧，与输热介质进行一次热传递，一次热传递降温后的低温热源1排出换热器11，继续作为工业冷却循环水；另一股通过第二低温热源输送管道进入电动热泵10的蒸发器，释热降温，以便与输热介质进行二次热传递，之后排出电动热泵10，继续作为工业冷却循环水。Specifically, the electric heat pump 10 and one side of the heat exchanger 11 are connected through a heat transfer medium conveying pipeline, and the heat conveying medium enters the heat exchanger 11 and the electric heat pump 10 sequentially through the heat conveying medium conveying pipeline. The low-temperature heat source 1 is industrial cooling circulating water, which is divided into two parts, one enters the other side of the heat exchanger 11 through the first low-temperature heat source transportation pipeline, and conducts a heat transfer with the heat transfer medium, and the first heat transfer is the low-temperature heat source after cooling. 1. The heat exchanger 11 is discharged to continue to be used as industrial cooling circulating water; the other one enters the evaporator of the electric heat pump 10 through the second low-temperature heat source transportation pipeline, and releases heat to cool down, so as to conduct secondary heat transfer with the heat transfer medium, and then discharge the electric heat pump 10. The heat pump 10 continues to serve as the industrial cooling circulating water.

而低温热源1在电动热泵10的蒸发器中释热降温，给输热介质热传递的同时，电动热泵10内的热泵还将进一步给输热介质进行加热。The low-temperature heat source 1 releases heat in the evaporator of the electric heat pump 10 to cool down, and while transferring heat to the heat transfer medium, the heat pump in the electric heat pump 10 will further heat the heat transfer medium.

可选的，低温热源1的初始温度为50°以下；输热介质的初始温度为0-10°；输热介质依次进入换热器11和电动热泵10热传递后升温至50-80°。Optionally, the initial temperature of the low temperature heat source 1 is below 50°; the initial temperature of the heat transfer medium is 0-10°;

可选的，换热器11包括板式换热器。Optionally, the heat exchanger 11 includes a plate heat exchanger.

基于单管长输的低温余热供热***包括：主动力泵2，主动力泵2设置在输热介质摄取端3，用于在抽取输热介质时提供动力，以便于将输热介质从输热介质摄取端3抽取至输热介质输送管道中，最终进入低温余热回收单元100中进行热量的交换。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a main power pump 2, which is arranged at the heat transfer medium intake end 3, and is used to provide power when the heat transfer medium is extracted, so as to facilitate the transfer of the heat transfer medium from the heat transfer medium. The heat medium intake end 3 is drawn into the heat transfer medium pipeline, and finally enters the low-temperature waste heat recovery unit 100 for heat exchange.

基于单管长输的低温余热供热***包括：水热换热单元200，水热换热单元200用于将低温余热回收单元100加热后的输热介质的热量传递给一次网8的一次网回水回水。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a hydrothermal heat exchange unit 200, which is used to transfer the heat of the heat transfer medium heated by the low-temperature waste heat recovery unit 100 to the primary network of the primary network 8 backwater backwater.

基于单管长输的低温余热供热***包括：长输单管5，长输单管5的始端与低温热源输送管道的出口连通，长输单管5的末端与水热换热单元200连通，从低温余热回收单元100输出的输热介质通过长输单管5输送至水热换热单元200中。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a long-distance single pipe 5, the beginning of the long-distance single pipe 5 is connected with the outlet of the low-temperature heat source transport pipe, and the end of the long-distance single pipe 5 is connected with the water-heat heat exchange unit 200. , the heat transfer medium output from the low-temperature waste heat recovery unit 100 is transferred to the hydrothermal heat exchange unit 200 through the long-distance single pipe 5 .

具体地，长输单管5的始端与低温余热回收单元100连通，长输单管5的末端与水热换热单元200连通，长输单管5不具有回水管，因此减少了回水管道的建设，减少近40％的建设投资；同时省去了回水管道的沿程阻力损失，降低了近50％的水泵耗电量。Specifically, the start end of the long-distance single pipe 5 is connected with the low-temperature waste heat recovery unit 100, and the end of the long-distance single pipe 5 is connected with the water-heat heat exchange unit 200. The long-distance single pipe 5 does not have a return pipe, so the return pipe is reduced. It can reduce the construction investment by nearly 40%; at the same time, it saves the resistance loss along the backwater pipeline and reduces the power consumption of the pump by nearly 50%.

基于单管长输的低温余热供热***包括：至少一个中继泵6，中继泵6设置在长输单管5上，用于在输送输热介质时提供动力，以便于将输热介质从低温余热回收单元100输送至水热换热单元200中。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: at least one relay pump 6, and the relay pump 6 is arranged on the long-distance single pipe 5 to provide power when transporting the heat transfer medium, so as to facilitate the transfer of the heat transfer medium. It is transported from the low-temperature waste heat recovery unit 100 to the hydrothermal heat exchange unit 200 .

可选的，多个中继泵6串联或并联。Optionally, multiple relay pumps 6 are connected in series or in parallel.

基于单管长输的低温余热供热***包括：至少一个一次网循环泵7，一次网循环泵7设置在一次网回水管道和一次网供水管道上，用于在输送一次网回水或一次网供水时提供动力，以便于将一次网回水输送至水热换热单元200，或将一次网供水输送至一次网供水管道。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: at least one primary network circulating pump 7, which is arranged on the primary network return water pipeline and the primary network water supply pipeline, and is used for conveying the primary network return water or primary network return water. When supplying water from the network, power is provided so as to deliver the return water of the primary network to the hydrothermal heat exchange unit 200, or to deliver the water supply of the primary network to the water supply pipeline of the primary network.

可选的，一次网循环泵7仅设置在一次网回水管道上，用于在输送一次网回水时提供动力，以便于将一次网回水输送至水热换热单元200。Optionally, the primary net circulating pump 7 is only provided on the primary net return water pipeline to provide power when transporting the primary net return water, so as to transport the primary net return water to the hydrothermal heat exchange unit 200 .

可选的，一次网循环泵7设置在一次网供水管道上，用于在输送一次网供水时提供动力，以便于将一次网供水输送至一次网供水管道。Optionally, the primary network circulating pump 7 is arranged on the primary network water supply pipeline, and is used to provide power when delivering the primary network water supply, so as to facilitate the delivery of the primary network water supply to the primary network water supply pipeline.

可选的，一次网回水管道和一次网供水管道上也可以不设置一次网循环泵7，技术人员可以按照具体情况进行设置。Optionally, the primary network circulating pump 7 may not be provided on the primary network return water pipeline and the primary network water supply pipeline, and the technician can set it according to the specific situation.

基于单管长输的低温余热供热***包括：输热介质释放端4，高温的输热介质依次进入换热器11、电动热泵10中进行热传递降温后通过管道排出水热换热单元200，进而从输热介质释放端4排放至外部环境中。该外部环境为抽取输热介质的地区。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: the heat transfer medium release end 4, the high-temperature heat transfer medium enters the heat exchanger 11 and the electric heat pump 10 in turn for heat transfer and cooling, and then discharges the water-heat heat exchange unit 200 through the pipeline. , and then discharged from the heat transfer medium release end 4 to the external environment. The external environment is the area where the heat transfer medium is extracted.

可选的，在水热换热单元200内热传递后的输热介质的温度为15°以下后，将从输热介质释放端4排放至外部环境中。Optionally, after the temperature of the heat transfer medium after heat transfer in the hydrothermal heat exchange unit 200 is below 15°, it will be discharged from the heat transfer medium release end 4 to the external environment.

图3是本发明提供的一实施例中水热换热单元200的示意图，请查看图3，在一实施例中，水热换热单元200包括电动热泵10、换热器11和燃气锅炉14。FIG. 3 is a schematic diagram of a hydrothermal heat exchange unit 200 in an embodiment provided by the present invention. Please refer to FIG. 3 . In an embodiment, the hydrothermal heat exchange unit 200 includes an electric heat pump 10 , a heat exchanger 11 and a gas boiler 14 .

具体地，电动热泵10和换热器11的一侧通过输热介质输送管道连通，使得高温的输热介质依次进入换热器11、电动热泵10。一次网回水管道包括第一一次网回水管道和第二一次网回水管道，因此一次网回水被分为两股，第一股一次网回水进入电动热泵10中与输热介质进行热传递，热传递后的第一股一次网回水进入燃气锅炉14中进一步热传递升温，最终得到高温的一次网回水。第二股一次网回水进入换热器11中与输热介质进行热传递，热传递后的第二股一次网回水与第一股一次网回水汇合后一同进入燃气锅炉14中进一步加热升温，最终得到高温的一次网供水。Specifically, the electric heat pump 10 and one side of the heat exchanger 11 are connected through a heat transfer medium conveying pipeline, so that the high temperature heat transfer medium enters the heat exchanger 11 and the electric heat pump 10 in sequence. The primary network return water pipeline includes the first primary network return water pipeline and the second primary network return water pipeline, so the primary network return water is divided into two shares, and the first primary network return water enters the electric heat pump 10 and transmits heat. The medium conducts heat transfer, and the first primary network return water after the heat transfer enters the gas boiler 14 for further heat transfer and temperature rise, and finally obtains a high-temperature primary network return water. The second primary network return water enters the heat exchanger 11 for heat transfer with the heat transfer medium, and the second primary network return water after heat transfer and the first primary network return water join together into the gas boiler 14 for further heating The temperature rises, and finally a high-temperature primary network water supply is obtained.

可选的，在该实施例中，在水热换热单元200内进行热传递后的一次网供水的温度为80-130°。Optionally, in this embodiment, the temperature of the primary network water supply after heat transfer is performed in the hydrothermal heat exchange unit 200 is 80-130°.

图4是本发明提供的另一实施例中水热换热单元200的示意图，请查看图4，在另一实施例中，水热换热单元200包括燃气热泵12和换热器11。FIG. 4 is a schematic diagram of a hydrothermal heat exchange unit 200 in another embodiment provided by the present invention. Please refer to FIG. 4 . In another embodiment, the hydrothermal heat exchange unit 200 includes a gas heat pump 12 and a heat exchanger 11 .

具体地，燃气热泵12和换热器11的一侧通过输热介质输送管道连通，使得高温的输热介质通过该管道依次进入换热器11、燃气热泵12。一次网回水管道包括第一一次网回水管道和第二一次网回水管道，因此一次网回水被分为两股，第一股一次网回水进入燃气热泵12中与输热介质进行热传递，最终得到高温的一次网供水。第二股一次网回水进入换热器11中与输热介质进行热传递，热传递后得到的两股一次网供水汇合。Specifically, the gas-fired heat pump 12 and one side of the heat exchanger 11 are communicated through a heat-transfer medium conveying pipeline, so that the high-temperature heat-transfer medium enters the heat exchanger 11 and the gas-fired heat pump 12 sequentially through the pipeline. The primary network return water pipeline includes the first primary network return water pipeline and the second primary network return water pipeline, so the primary network return water is divided into two parts, and the first primary network return water enters the gas heat pump 12 and transmits heat. The medium conducts heat transfer, and finally a high-temperature primary network water supply is obtained. The second primary net return water enters the heat exchanger 11 for heat transfer with the heat transfer medium, and the two primary net water supplies obtained after the heat transfer merge.

基于单管长输的低温余热供热***包括：输送管道E。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: transmission pipeline E.

具体地，输送管道E的输入端与一次网8的一次网回水管道连通，输送管道E的输出端与一次网8的一次网供水管道连通，使得加热后一次网供水能够直接通过输送管道E输送至用户使用，也能够使得用户使用完低温的回水通过一次网回水管道输送至水热换热单元200中进行重新加热。Specifically, the input end of the conveying pipeline E is connected to the primary network return water pipeline of the primary network 8, and the output end of the conveying pipeline E is connected to the primary network water supply pipeline of the primary network 8, so that the water supply of the primary network can directly pass through the conveying pipeline E after heating After being transported to the user for use, the low-temperature return water can also be transported to the hydrothermal heat exchange unit 200 for reheating through the primary network return water pipeline after the user has finished using it.

基于单管长输的低温余热供热***包括：第一换热热力单元A，第一换热热力单元A用于将一次网供水的热量传递给二次网13的二次网回水。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a first heat exchange thermal unit A, which is used to transfer the heat of the primary network water supply to the secondary network return water of the secondary network 13 .

具体地，第一换热热力单元A包括吸收式换热器9和二次网回水管道；吸收式换热器9的一侧设置有一次网供水管道，用于输送一次网供水，吸收式换热器9的另一侧设置有二次网回水管道，用于输送二次网回水。从水热换热单元200输出的高温的一次网供水通过一次网供水管道进入吸收式换热器9，将热量传递给二次网回水，热传递降温后的一次网供水输出吸收式换热器9，重新进入水热换热单元200进行循环加热。加热后得到的二次网供水将输送给用户使用。Specifically, the first heat exchange thermal unit A includes an absorption heat exchanger 9 and a secondary network return pipe; one side of the absorption heat exchanger 9 is provided with a primary network water supply pipe for conveying primary network water supply. The other side of the heat exchanger 9 is provided with a secondary network return water pipeline for conveying the secondary network return water. The high-temperature primary network water output from the hydrothermal heat exchange unit 200 enters the absorption heat exchanger 9 through the primary network water supply pipeline, and transfers heat to the secondary network return water, and the primary network water supply after heat transfer and cooling is output for absorption heat exchange 9, and re-enter the hydrothermal heat exchange unit 200 for circulating heating. The secondary network water supply obtained after heating will be delivered to users for use.

可选的，在该实施例中，与一次网供水进行热传递后得到的二次网供水的温度为50°以上。Optionally, in this embodiment, the temperature of the water supply from the secondary network obtained after heat transfer with the water supply from the primary network is above 50°.

基于单管长输的低温余热供热***包括：第二换热热力单元B，第一换热热力单元B用于将一次网供水的热量传递给二次网13的二次网回水。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a second heat exchange thermal unit B, and the first heat exchange thermal unit B is used to transfer the heat of the primary network water supply to the secondary network return water of the secondary network 13 .

具体地，第二换热热力单元B包括燃气热泵12和二次网回水管道；燃气热泵12的一侧设置有一次网供水管道，用于输送一次网供水，燃气热泵12的另一侧设置有二次网回水管道，用于输送二次网回水。从水热换热单元200输出的高温的一次网供水通过一次网供水管道进入燃气热泵12，将热量传递给二次网回水，热传递降温后的一次网供水输出燃气热泵12，重新进入水热换热单元200进行循环加热。在一次网供水给二次网回水传递热量的同时，燃气热泵12进一步给二次网回水进行加热。加热后得到的二次网供水将输送给用户使用。Specifically, the second heat exchange thermal unit B includes a gas heat pump 12 and a secondary network return water pipeline; one side of the gas heat pump 12 is provided with a primary network water supply pipeline for conveying water supply from the primary network, and the other side of the gas heat pump 12 is provided with a primary network water supply pipeline. There is a secondary network return water pipeline, which is used to transport the secondary network return water. The high-temperature primary network water output from the hydrothermal heat exchange unit 200 enters the gas heat pump 12 through the primary network water supply pipeline, and transfers heat to the secondary network return water, and the primary network water supply after heat transfer and cooling is output to the gas heat pump 12, and re-enters the water The heat exchange unit 200 performs circulating heating. While the water from the primary network transfers heat to the return water of the secondary network, the gas heat pump 12 further heats the return water of the secondary network. The secondary network water supply obtained after heating will be delivered to users for use.

可选的，在该实施例中，与一次网回水进行热传递后得到的二次网供水的温度为50°以上。Optionally, in this embodiment, the temperature of the water supply from the secondary net obtained after heat transfer with the return water of the primary net is above 50°.

基于单管长输的低温余热供热***包括：第三换热热力单元C，第三换热热力单元C用于将一次网供水的热量传递给二次网13的二次网回水。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a third heat exchange thermal unit C, which is used to transfer the heat of the primary network water supply to the secondary network return water of the secondary network 13 .

具体地，第三换热热力单元C包括电动热泵10、换热器11和二次网回水管道；电动热泵10和换热器11的一侧通过一次网供水管道连通，用于输送一次网回水，电动热泵10和换热器11的另一侧分别设置有二次网回水管道，用于输送二次网回水。从水热换热单元200输出的高温的一次网供水通过一次网供水管道依次进入换热器11、电动热泵10；首先，高温的一次网供水将热量传递给输送至换热器11中的二次网回水，加热后得到的二次网供水输送给用户使用；紧接着，热传递后处于中温的一次网供水再将热量传递给输送至电动热泵10中的另一二次网回水，同时电动热泵10进一步对该二次网回水进行加热，最终将加热得到的二次网供水输送给用户使用。热传递降温后的一次网供水8输出电动热泵10，重新进入水热换热单元200进行循环加热。Specifically, the third heat exchange thermal unit C includes an electric heat pump 10, a heat exchanger 11 and a secondary network return water pipeline; one side of the electric heat pump 10 and the heat exchanger 11 is communicated through a primary network water supply pipeline for conveying the primary network For the return water, the electric heat pump 10 and the other side of the heat exchanger 11 are respectively provided with secondary network return water pipelines for conveying the secondary network return water. The high-temperature primary network water output from the hydrothermal heat exchange unit 200 enters the heat exchanger 11 and the electric heat pump 10 in turn through the primary network water supply pipeline; The secondary network returns water, and the secondary network water supply obtained after heating is delivered to the user for use; then, the primary network water supply at a medium temperature after heat transfer transfers the heat to another secondary network return water in the electric heat pump 10, At the same time, the electric heat pump 10 further heats the return water of the secondary network, and finally delivers the heated water from the secondary network to the user for use. The primary network water supply 8 after heat transfer and cooling is output to the electric heat pump 10 and re-enters the water-heat heat exchange unit 200 for circulating heating.

基于单管长输的低温余热供热***包括：第四换热热力单元D，第四换热热力单元D用于将一次网供水的热量传递给二次网13的二次网回水。The low-temperature waste heat heating system based on single-pipe long-distance transmission includes: a fourth heat exchange thermal unit D, which is used to transfer the heat of the primary network water supply to the secondary network return water of the secondary network 13 .

具体地，第四换热热力单元D包括电动热泵10和吸收式换热器9；电动热泵10和吸收式换热器9的一侧通过一次网供水管道连通，用于输送一次网供水，电动热泵10和吸收式换热器9的另一侧分别设置有二次网回水管道，用于输送二次网回水。从水热换热单元200输出的高温的一次网供水通过管道依次进入吸收式换热器9、电动热泵10；首先，高温的一次网供水将热量换给输送至吸收式换热器9中的二次网回水，加热后得到的二次网供水输送给用户使用；紧接着，热传递后处于中温的一次网供水8再将热量换给输送至电动热泵10中的另一二次网回水，同时电动热泵10进一步对该二次网回水进行加热，最终将加热后得到的二次网供水输送给用户使用。热传递降温后的一次网供水输出电动热泵10，重新进入水热换热单元200进行循环加热。Specifically, the fourth heat exchange thermal unit D includes an electric heat pump 10 and an absorption heat exchanger 9; one side of the electric heat pump 10 and the absorption heat exchanger 9 is connected through a primary network water supply pipeline for conveying primary network water supply. The heat pump 10 and the other side of the absorption heat exchanger 9 are respectively provided with secondary network return water pipes for conveying the secondary network return water. The high-temperature primary network water output from the hydrothermal heat exchange unit 200 enters the absorption heat exchanger 9 and the electric heat pump 10 in turn through pipes; The secondary network returns water, and the secondary network water supply obtained after heating is delivered to the user for use; then, the primary network water supply 8 that is at a medium temperature after heat transfer transfers the heat to another secondary network return in the electric heat pump 10. At the same time, the electric heat pump 10 further heats the return water of the secondary network, and finally delivers the water supply of the secondary network obtained after heating to the user for use. After the heat transfer and cooling down, the water supply from the primary network is output to the electric heat pump 10 and re-enters the water-heat heat exchange unit 200 for circulating heating.

实施例1Example 1

在该实施例中，低温热源1是位于海边的化工厂排出的无污染废水，低温热源1的初始温度为45°；主动力泵2从输热介质摄取端3取得海水作为输热介质，海水的初始温度为0-10°。In this embodiment, the low-temperature heat source 1 is pollution-free waste water discharged from a chemical plant located on the seashore, and the initial temperature of the low-temperature heat source 1 is 45°; the main power pump 2 obtains seawater from the heat transfer medium intake end 3 as the heat transfer medium, and the seawater The initial temperature is 0-10°.

0-10°的海水先通过输热介质输送管道进入低温余热回收单元100的换热器11中被加热至43°，然后进入电动热泵10，被加热到70°后进入长输单管5，长输单管5上设置的中继泵6能够提供动力，克服管路沿程阻力，将加热至70°的海水从长输单管5抽取至水热换热单元200中。The seawater of 0-10° first enters the heat exchanger 11 of the low-temperature waste heat recovery unit 100 through the heat transfer medium conveying pipeline and is heated to 43°, then enters the electric heat pump 10, is heated to 70°, and then enters the long-distance transmission single pipe 5, The relay pump 6 provided on the long-distance transmission single pipe 5 can provide power to overcome the resistance along the pipeline, and extract the seawater heated to 70° from the long-distance transmission single pipe 5 to the water-heat heat exchange unit 200 .

水热换热单元200位于城市边缘且同样位于海边。The hydrothermal heat exchange unit 200 is located at the edge of the city and also at the seaside.

在水热换热单元200内，70°的海水先进入换热器11，与一次网回水管道中的15°回水进行热传递，热传递后海水降温到17°，17°的海水再进入电动热泵10的蒸发器中继续降温释热，降温到5°后排放到输热介质释放端4返回大海。In the hydrothermal heat exchange unit 200, the 70° seawater first enters the heat exchanger 11, and conducts heat transfer with the 15° return water in the primary network return pipe. It enters the evaporator of the electric heat pump 10 to continue to cool down and release heat, and after the temperature is lowered to 5°, it is discharged to the heat transfer medium release end 4 and returned to the sea.

一次网回水管道中的15°回水被分成两股：第一股一次网回水和第二股一次网回水，第一股一次网回水进入到换热器11中，与70°的海水热传递，热传递后回水温度达到68°；第二股一次网回水进入电动热泵10中与17°的海水热传递，热传递的同时被电动热泵10加热到68°。The 15° return water in the primary network return water pipeline is divided into two shares: the first primary network return water and the second primary network return water, the first primary network return water enters the heat exchanger 11, and the 70° After the heat transfer, the return water temperature reaches 68°; the return water of the second primary network enters the electric heat pump 10 and transfers heat to the seawater of 17°, and is heated to 68° by the electric heat pump 10 at the same time of heat transfer.

均达到68°的第一股一次网回水和第二股一次网回水汇合后进入燃气锅炉14中，燃气锅炉14进一步对其进行加热，直到回水的温度达到100°后排出，并进入一次网供水管道中。The first primary network return water and the second primary network return water that both reach 68° are merged into the gas boiler 14, and the gas boiler 14 further heats it until the temperature of the return water reaches 100° and then discharges and enters the gas boiler 14. In the primary network water supply pipeline.

当热网为直供管网时，一次网供水通过输送管道E直接输送至用户使用。When the heating network is a direct supply pipe network, the water supply from the primary network is directly transported to the user through the transmission pipeline E.

本实施例中，燃气锅炉14起到调峰的作用，严寒期时燃气锅炉14打开，初末寒期时关闭燃气锅炉14或者减小燃气锅炉14的热量输出。In this embodiment, the gas boiler 14 plays the role of peak regulation, the gas boiler 14 is turned on during the severe cold period, and the gas boiler 14 is turned off or the heat output of the gas boiler 14 is reduced during the early and late cold periods.

实施例2Example 2

低温热源1位于城市边缘的污水处理厂附近，低温热源1的初始温度为50°；主动力泵2从输热介质摄取端3取得污水处理厂排放的污水作为输热介质，污水的初始温度为0-10°。The low temperature heat source 1 is located near the sewage treatment plant on the edge of the city, and the initial temperature of the low temperature heat source 1 is 50°; the main power pump 2 obtains the sewage discharged from the sewage treatment plant from the heat transfer medium intake end 3 as the heat transfer medium, and the initial temperature of the sewage is 0-10°.

0-10°的污水先进入低温余热回收单元100的换热器11中被加热至 45°，然后进入电动热泵10，被加热到80°后进入长输单管5，长输单管5上设置的中继泵6提供动力，克服管路沿程阻力，将加热至80°的污水从长输单管5抽取至水热换热单元200中。The sewage at 0-10° first enters the heat exchanger 11 of the low-temperature waste heat recovery unit 100 and is heated to 45°, then enters the electric heat pump 10, is heated to 80°, and then enters the long-distance transmission single pipe 5. The relay pump 6 provided provides power, overcomes the resistance along the pipeline, and extracts the sewage heated to 80° from the long-distance single pipe 5 to the hydrothermal heat exchange unit 200 .

水热换热单元200位于城市边缘且同样位于污水处理厂附近。The hydrothermal heat exchange unit 200 is located on the edge of the city and also near the sewage treatment plant.

在水热换热单元200内，80°的污水先进入换热器11，与一次网回水管道中的20°回水进行热传递，热传递后海水降温到30°，30°的污水再进入电动热泵10的蒸发器中继续降温释热，降温到5°后排放到输热介质释放端4返回污水处理厂。In the hydrothermal heat exchange unit 200, the 80° sewage first enters the heat exchanger 11, and conducts heat transfer with the 20° return water in the primary network return pipe. After the heat transfer, the seawater is cooled to 30°, and the 30° sewage is recycled It enters the evaporator of the electric heat pump 10 and continues to cool down and release heat, and after the temperature is lowered to 5°, it is discharged to the heat transfer medium release end 4 and returned to the sewage treatment plant.

一次网回水管道中的20°回水被分成两股：第一股一次网回水和第二股一次网回水，第一股一次网回水进入到换热器11中，与80°的污水热传递，热传递后回水温度达到100°；第二股一次网回水进入电动热泵10中与30°的海水热传递，热传递的同时被电动热泵10加热到100°。The 20° return water in the primary network return water pipeline is divided into two shares: the first primary network return water and the second primary network return water, the first primary network return water enters the heat exchanger 11, and the 80° After the heat transfer, the return water temperature reaches 100°; the second primary network return water enters the electric heat pump 10 and transfers heat to the seawater at 30°, and is heated to 100° by the electric heat pump 10 at the same time of heat transfer.

100°的一次网供水通过一次网供水管道被分配到城市各个地方的换热热力单元，结合城市中不通过地区的实际情况，通过以下四种不同的换热热力单元，将100°的一次网供水的热量传递给二次网回水，热传递后的一次网供水降温到15°后，再返回到水热换热单元200被循环加热。The 100° primary network water supply is distributed to the heat exchange and thermal units in various places in the city through the primary network water supply pipeline. Combined with the actual situation in the non-passing areas in the city, the following four different heat exchange thermal units are used to convert the 100° primary network. The heat of the water supply is transferred to the return water of the secondary network, and after the heat transfer, the water supply of the primary network is cooled to 15°, and then returned to the hydrothermal heat exchange unit 200 for circulating heating.

本实施例中不同的四种换热热力单元为：The four different heat exchange thermal units in this embodiment are:

当某一地区的原有热力单元不具备燃气增容和电力增容的条件时，采用第一换热热力单元A，第一换热热力单元A由吸收式换热器9组成。一次网供水和二次网回水在吸收式换热器9中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area does not have the conditions for gas capacity increase and electric power capacity increase, the first heat exchange thermal unit A is used, and the first heat exchange thermal unit A consists of an absorption heat exchanger 9 . After the water supply from the primary network and the return water from the secondary network are heat transferred in the absorption heat exchanger 9, the return water from the secondary network is heated to 50° and then delivered to the user.

当某一地区的原有热力单元仅具备电力增容的条件时，采用第二换热热力单元B，第二换热热力单元B由吸收式换热器9和电动热泵10组成，100°的一次网供水先进入吸收式换热器9中释热降温，再进入电动热泵10的蒸发器中继续降温后输出，返回到一次网回水管道中，进而返回到水热换热单元200被循环加热。100°的一次网供水和二次网回水在吸收式换热器9中热传递后，将二次网回水加热到50°后输送至用户。50°的一次网供水和二次网回水在电动热泵10中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area only has the conditions for power capacity increase, the second heat exchange thermal unit B is used. The second heat exchange thermal unit B consists of an absorption heat exchanger 9 and an electric heat pump 10. The water supply from the primary network first enters the absorption heat exchanger 9 to release heat and cool down, and then enters the evaporator of the electric heat pump 10 to continue cooling and then output, returns to the primary network return water pipeline, and then returns to the water-heat heat exchange unit 200 to be circulated heating. After the 100° primary network water supply and the secondary network return water are heat transferred in the absorption heat exchanger 9, the secondary network return water is heated to 50° and then delivered to the user. 50° primary network water supply and secondary network return water after heat transfer in the electric heat pump 10, the secondary network return water is heated to 50° and then delivered to the user.

当某一地区的原有热力单元具备电力增容条件但不具备空间增容的条件时，采用第三换热热力单元C，第三换热热力单元C由换热器11和电动热泵10组成，100°的一次网供水先进入换热器1中释热降温，再进入电动热泵10的蒸发器中继续降温后输出，返回到一次网回水管道中，进而返回到水热换热单元200被循环加热。100°的一次网供水和二次网回水在换热器11中热传递后，将二次网回水加热到50°后输送至用户。50°的一次网供水和二次网回水在电动热泵10中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area has the conditions for power capacity increase but does not have the conditions for space capacity increase, the third heat exchange thermal unit C is used, and the third heat exchange thermal unit C consists of a heat exchanger 11 and an electric heat pump 10. The 100° primary network water supply first enters the heat exchanger 1 to release heat and cool down, and then enters the evaporator of the electric heat pump 10 to continue to cool down and then output, returns to the primary network return water pipeline, and then returns to the hydrothermal heat exchange unit 200 heated by circulation. After the 100° primary network water supply and the secondary network return water are heat transferred in the heat exchanger 11, the secondary network return water is heated to 50° and then delivered to the user. After the 50° primary network water supply and the secondary network return water are thermally transferred in the electric heat pump 10, the secondary network return water is heated to 50° and then delivered to the user.

当某一地区的原有热力单元仅具备燃气增容的条件时，采用第四换热热力单元D，第四换热热力单元D由燃气热泵12组成，100°的一次网供水进入燃气热泵12中释热降温后输出，返回到一次网回水管道中，进而返回到水热换热单元200被循环加热。100°的一次网供水和二次网回水在燃气热泵12中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area only has the conditions for gas capacity expansion, the fourth heat exchange thermal unit D is used. The medium-release heat is cooled and output, returned to the primary network return water pipeline, and then returned to the hydrothermal heat exchange unit 200 for circulating heating. After the 100° primary network water supply and the secondary network return water are heat-transferred in the gas heat pump 12, the secondary network return water is heated to 50° and then delivered to the user.

实施例3Example 3

在该实施例中，低温热源1位于城市边缘的自来水厂附近，低温热源1的初始温度为40°；主动力泵2从输热介质摄取端3取得自来水厂的自来水作为输热介质，自来水的初始温度为0-10°。In this embodiment, the low-temperature heat source 1 is located near the waterworks on the edge of the city, and the initial temperature of the low-temperature heat source 1 is 40°; the main power pump 2 obtains the tap water from the waterworks from the heat transfer medium intake end 3 as the heat transfer medium, and the The initial temperature is 0-10°.

0-10°的自来水先进入低温余热回收单元100的换热器11中被加热至50°，然后进入电动热泵10，被加热到80°后进入长输单管5，长输单管5上设置的中继泵6提供动力，克服管路沿程阻力，将加热至80°的自来水从长输单管5抽取至水热换热单元200中。The tap water of 0-10° first enters the heat exchanger 11 of the low-temperature waste heat recovery unit 100 and is heated to 50°, then enters the electric heat pump 10, is heated to 80°, and then enters the long-distance transmission single pipe 5, and the long-distance transmission single pipe 5 The relay pump 6 provided provides power, overcomes the resistance along the pipeline, and extracts the tap water heated to 80° from the long-distance single pipe 5 to the water-heat heat exchange unit 200 .

水热换热单元200位于城市边缘且同样位于自来水厂附近。The hydrothermal heat exchange unit 200 is located on the edge of the city and also near the waterworks.

在水热换热单元200内，80°的自来水先进入换热器11，与一次网回水管道中的10°回水进行换热，换热后自来水降温到20°，20°的自来水再进入电动热泵10的蒸发器中继续降温释热，降温到5°后排放到输热介质释放端4返回自来水厂。In the water-heat heat exchange unit 200, the 80° tap water first enters the heat exchanger 11, and exchanges heat with the 10° return water in the primary network return water pipeline. It enters the evaporator of the electric heat pump 10 to continue to cool down and release heat, and after the temperature reaches 5°, it is discharged to the heat transfer medium release end 4 and returned to the waterworks.

或者，80°的自来水直接进入城市的给水***，作为“热”和“水”的两种商品输出使用。Alternatively, tap water at 80° goes directly into the city's water supply system and is used as two commodity outputs of "heat" and "water".

一次网回水管道中的10°回水被分成两股：第一股一次网回水和第二股一次网回水，第一股一次网回水进入到换热器11中，与80°的自来水换热，换热后回水温度达到100°；第二股一次网回水进入电动热泵10中与20°的自来水换热，换热的同时被电动热泵10加热到100°。The 10° return water in the primary network return water pipeline is divided into two shares: the first primary network return water and the second primary network return water, the first primary network return water enters the heat exchanger 11, and the 80° After heat exchange, the return water temperature reaches 100°; the second primary network return water enters the electric heat pump 10 to exchange heat with tap water at 20°, and is heated to 100° by the electric heat pump 10 during heat exchange.

当热网为直供管网时，100°的一次网供水将通过输送管道E直接输送至用户使用。When the heating network is a direct supply pipe network, the 100° water supply from the primary network will be directly delivered to the user through the transmission pipeline E.

当热网不是直供管网时，100°的一次网供水将通过一次网供水管道直接被分配到城市各个地方的换热热力单元，结合城市中不通过地区的实际情况，通过以下四种不同的换热热力单元，将100°的一次网供水换热给二次网回水，换热后的一次网供水降温到10°后，再返回到水热换热单元200被循环加热。When the heating network is not a direct supply pipe network, the 100° primary network water supply will be directly distributed to the heat exchange and heat units in various parts of the city through the primary network water supply pipeline. Combined with the actual situation in the city that does not pass through the area, through the following four different The heat exchange thermal unit of the 100° primary network water is exchanged to the secondary network return water. After the heat exchange, the primary network water supply is cooled to 10°, and then returned to the hydrothermal heat exchange unit 200 for cyclic heating.

本实施例中不同的四种换热热力站为：The four different heat exchange thermal stations in this embodiment are:

当某一地区的原有热力单元仅具备电力增容的条件时，采用第二换热热力单元B，第二换热热力单元B由吸收式换热器9和电动热泵10组成，100°的一次网供水先进入吸收式换热器9中释热降温，再进入电动热泵10的蒸发器中继续降温后输出，返回到一次网回水管道中，进而返回到水热换热单元200被循环加热。100°的一次网供水和二次网回水在吸收式换热器9中热传递后，将二次网回水加热到50°后输送至用户。50°的一次网供水和二次网回水在电动热泵10中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area only has the conditions for power capacity increase, the second heat exchange thermal unit B is used. The second heat exchange thermal unit B consists of an absorption heat exchanger 9 and an electric heat pump 10. The water supply from the primary network first enters the absorption heat exchanger 9 to release heat and cool down, and then enters the evaporator of the electric heat pump 10 to continue to cool down and then output, returns to the primary network return water pipeline, and then returns to the water-heat heat exchange unit 200 to be circulated heating. After the 100° primary network water supply and the secondary network return water are heat transferred in the absorption heat exchanger 9, the secondary network return water is heated to 50° and then delivered to the user. After the 50° primary network water supply and the secondary network return water are thermally transferred in the electric heat pump 10, the secondary network return water is heated to 50° and then delivered to the user.

当某一地区的原有热力单元具备电力增容条件但不具备空间增容的条件时，采用第三换热热力单元C，第三换热热力单元C由换热器11和电动热泵 10组成，100°的一次网供水先进入换热器1中释热降温，再进入电动热泵10的蒸发器中继续降温后输出，返回到一次网回水管道中，进而返回到水热换热单元200被循环加热。100°的一次网供水和二次网回水在换热器11中热传递后，将二次网回水加热到50°后输送至用户。50°的一次网供水和二次网回水在电动热泵10中热传递后，将二次网回水加热到50°后输送至用户。When the original thermal unit in a certain area has the conditions for power capacity increase but does not have the conditions for space capacity increase, the third heat exchange thermal unit C is used, and the third heat exchange thermal unit C consists of a heat exchanger 11 and an electric heat pump 10. The 100° primary network water supply first enters the heat exchanger 1 to release heat and cool down, and then enters the evaporator of the electric heat pump 10 to continue to cool down and then output, returns to the primary network return water pipeline, and then returns to the hydrothermal heat exchange unit 200 heated by circulation. After the 100° primary network water supply and the secondary network return water are heat transferred in the heat exchanger 11, the secondary network return water is heated to 50° and then delivered to the user. After the 50° primary network water supply and the secondary network return water are thermally transferred in the electric heat pump 10, the secondary network return water is heated to 50° and then delivered to the user.

本发明旨在保护一种基于单管长输的低温余热供热***，包括：低温余热回收单元以及低温热源，低温热源进入低温余热回收单元，与输送至低温余热回收单元的输热介质进行热传递；热传递后的输热介质通过长输单管进入水热换热单元中，与输送至水热换热单元的一次网回水进行热传递得到一次网供水；一次网供水通过不同形式的换热热力单元将热量传递给二次网回水，或一次网供水直接传递给用户使用。本发明通过借助位于低温热源附近的输热介质，将低温热源的热量换热给输热介质，再通过长距离单管将升温后的输热介质输送给城市使用，提高了低温余热输送的能量密度，同时大幅减少了热网的建设投资，省去了回水管道的沿程阻力损失，减少了水泵耗电量，进一步实现低温余热长距离输送的可行性。The invention aims to protect a low-temperature waste heat heating system based on single-pipe long-distance transmission, including: a low-temperature waste heat recovery unit and a low-temperature heat source. Transfer; the heat transfer medium after heat transfer enters the water-heat heat exchange unit through the long-distance single pipe, and conducts heat transfer with the primary network return water transported to the water-heat heat exchange unit to obtain the primary network water supply; the primary network water supply is passed through different forms. The heat exchange thermal unit transfers heat to the return water of the secondary network, or the water supply from the primary network is directly transferred to the user for use. The present invention improves the energy of low-temperature waste heat transportation by exchanging heat from the low-temperature heat source to the heat-transporting medium by means of the heat-transporting medium located near the low-temperature heat source, and then transporting the heated heat-transporting medium to the city through a long-distance single tube for use in the city. At the same time, it greatly reduces the construction investment of the heating network, saves the resistance loss along the return water pipeline, reduces the power consumption of the pump, and further realizes the feasibility of long-distance transportation of low-temperature waste heat.

应当理解的是，本发明的上述具体实施方式仅仅用于示例性说明或解释本发明的原理，而不构成对本发明的限制。因此，在不偏离本发明的精神和范围的情况下所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。此外，本发明所附权利要求旨在涵盖落入所附权利要求范围和边界、或者这种范围和边界的等同形式内的全部变化和修改例。It should be understood that the above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, but not to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention. Furthermore, the appended claims of this invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalents of such scope and boundaries.

Claims

一种基于单管长输的低温余热供热***，其特征在于，包括：A low-temperature waste heat heating system based on single-pipe long-distance transmission is characterized in that, comprising:

低温余热回收单元；以及low temperature waste heat recovery unit; and

设置在所述低温余热回收单元内的低温热源输送管道和输热介质输送管道，所述低温热源输送管道内的低温热源与所述输热介质输送管道内的输热介质在所述低温余热回收单元内进行热传递；The low temperature heat source conveying pipeline and the heat conveying medium conveying pipeline arranged in the low temperature waste heat recovery unit, the low temperature heat source in the low temperature heat source conveying pipeline and the heat conveying medium in the heat conveying medium conveying pipeline are recovered in the low temperature waste heat. heat transfer within the unit;

所述低温热源和所述输热介质均位于城市边缘的同一位置；Both the low-temperature heat source and the heat transfer medium are located at the same position on the edge of the city;

长输单管，所述长输单管的始端与所述输热介质输送管道的出口连通，所述长输单管的末端与水热换热单元连通，用于将热传递后的所述输热介质输送至所述水热换热单元中；The long-distance transportation single pipe, the beginning of the long-distance transportation single pipe is communicated with the outlet of the heat transfer medium transportation pipeline, and the end of the long-distance transportation single pipe is communicated with the water-heat heat exchange unit, which is used to transfer the heat transfer to the The heat transfer medium is transported to the hydrothermal heat exchange unit;

一次网回水管道，用于将一次网回水输送至所述水热换热单元中，使得热传递后的所述输热介质与所述一次网回水进行热传递，得到一次网高温供水；The primary network return water pipeline is used to transport the primary network return water to the hydrothermal heat exchange unit, so that the heat transfer medium after heat transfer and the primary network return water conduct heat transfer to obtain the primary network high-temperature water supply ;

一次网供水管道，所述一次网供水管道的输入口与所述一次网回水管道的输出口连通，所述一次网供水管道的输出口与换热热力单元连通，用于将所述一次网供水输送至所述换热热力单元中；The primary network water supply pipeline, the input port of the primary network water supply pipeline is communicated with the output port of the primary network return water pipeline, and the output port of the primary network water supply pipeline is communicated with the heat exchange thermal unit for connecting the primary network water supply pipeline. Water supply is delivered to the heat exchange thermal unit;

所述换热热力单元中还设有二次网回水管道，用于输送二次网回水，所述一次网供水与所述二次网回水在所述换热热力单元中进行热传递后得到的二次网供水将通过二次网供水管道输送给用户；或The heat exchange thermal unit is also provided with a secondary network return water pipeline for conveying the secondary network return water, and the primary network water supply and the secondary network return water conduct heat transfer in the heat exchange thermal unit. The obtained secondary network water supply will be delivered to the user through the secondary network water supply pipeline; or

一次网供水管道，用于将所述一次网供水直接输送至用户。The primary network water supply pipeline is used to directly deliver the primary network water supply to the user.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述低温热源包括工业冷却循环液体、工业冷却循环气体或工业排放的高温污水。The low-temperature heat source includes industrial cooling circulating liquid, industrial cooling circulating gas or high-temperature sewage discharged from industry.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述输热介质包括河流、湖泊、水库、大海、污水处理厂或自来水厂中的液体或者气体。The heat transfer medium includes liquid or gas in rivers, lakes, reservoirs, seas, sewage treatment plants or waterworks.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述低温余热回收单元包括：电动热泵和换热器；The low-temperature waste heat recovery unit includes: an electric heat pump and a heat exchanger;

所述电动热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述电动热泵；One side of the electric heat pump and one side of the heat exchanger are communicated through a pipeline, and the heat transfer medium enters the heat exchanger and the electric heat pump sequentially through the pipeline;

所述低温热源输送管道包括第一低温热源输送管道和第二低温热源输送管道；The low-temperature heat source transportation pipeline includes a first low-temperature heat source transportation pipeline and a second low-temperature heat source transportation pipeline;

所述第一低温热源输送管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；The first low-temperature heat source conveying pipeline enters the other side of the heat exchanger, and conducts primary heat transfer with the heat conveying medium;

所述第二低温热源输送管道进入所述电动热泵的另一侧，一次热传递后的所述输热介质与所述第二低温热源输送管道中的低温热源继续进行二次热传递。The second low-temperature heat source transportation pipeline enters the other side of the electric heat pump, and the heat transfer medium after primary heat transfer continues to perform secondary heat transfer with the low-temperature heat source in the second low-temperature heat source transportation pipeline.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述水热换热单元包括：电动热泵、换热器和燃气锅炉；The water-heat heat exchange unit includes: an electric heat pump, a heat exchanger and a gas boiler;

所述电动热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述电动热泵；One side of the electric heat pump and one side of the heat exchanger are communicated through a pipeline, and the heat transfer medium enters the heat exchanger and the electric heat pump sequentially through the pipeline;

所述一次网回水管道包括第一一次网回水管道和第二一次网回水管道；The primary network return pipeline includes a first primary network return pipeline and a second primary network return pipeline;

所述第二一次网回水管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；The second primary network return water pipeline enters the other side of the heat exchanger, and conducts primary heat transfer with the heat transfer medium;

所述第一一次网回水管道进入所述电动热泵的另一侧，一次热传递后的所述输热介质与所述第一一次网回水管道中的一次网回水继续进行二次热传递；The first primary network return water pipeline enters the other side of the electric heat pump, and the heat transfer medium after the primary heat transfer and the primary network return water in the first primary network return water pipeline continue for two secondary heat transfer;

热传递后的第二一次网回水与第一一次网回水汇合后进入所述燃气锅炉中继续进行加热。After the heat transfer, the return water of the second network and the return water of the first network are merged into the gas boiler to continue heating.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述水热换热单元包括：燃气热泵和换热器；The water-heat heat exchange unit includes: a gas heat pump and a heat exchanger;

所述燃气热泵的一侧和所述换热器的一侧通过管道连通，所述输热介质通过所述管道依次进入所述换热器、所述燃气热泵；One side of the gas-fired heat pump and one side of the heat exchanger are communicated through a pipeline, and the heat transfer medium enters the heat exchanger and the gas-fired heat pump sequentially through the pipeline;

所述一次网回水管道包括第一一次网回水管道和第二一次网回水管道；The primary network return pipeline includes a first primary network return pipeline and a second primary network return pipeline;

所述第二一次网回水管道进入所述换热器的另一侧，与所述输热介质进行一次热传递；The second primary network return pipe enters the other side of the heat exchanger, and conducts primary heat transfer with the heat transfer medium;

所述第一一次网回水管道进入所述燃气热泵的另一侧，一次热传递后的所述输热介质与所述第一一次网回水管道中的一次网回水继续进行二次热传递；The first primary network return pipeline enters the other side of the gas-fired heat pump, and the heat transfer medium after primary heat transfer and the primary network return water in the first primary network return pipeline continue for two secondary heat transfer;

热传递后的第二一次网回水与第一一次网回水汇合。The second net return water after heat transfer merges with the first net return water.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：第一换热热力单元；The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, further comprising: a first heat exchange thermal unit;

所述第一换热热力单元包括吸收式换热器；the first heat exchange thermal unit includes an absorption heat exchanger;

所述一次网供水管道设于所述吸收式换热器的一侧，所述二次网回水管道设于所述吸收式换热器的另一侧；The primary network water supply pipeline is arranged on one side of the absorption heat exchanger, and the secondary network water return pipeline is arranged on the other side of the absorption heat exchanger;

所述水热换热单元输出的一次网供水通过所述一次网供水管道进入所述吸收式换热器，与所述二次网回水管道中的二次网回水进行热传递；The primary network water output from the hydrothermal heat exchange unit enters the absorption heat exchanger through the primary network water supply pipeline, and conducts heat transfer with the secondary network return water in the secondary network return water pipeline;

热传递后的所述一次网供水输出所述吸收式换热器，重新进入所述水热换热单元进行循环加热。The water from the primary network after the heat transfer is output to the absorption heat exchanger, and re-enters the hydrothermal heat exchange unit for circulating heating.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：第二换热热力单元；The low-temperature waste heat heat supply system based on single-pipe long-distance transmission according to claim 1, further comprising: a second heat exchange thermal unit;

所述第二换热热力单元包括燃气热泵；The second heat exchange thermal unit includes a gas heat pump;

所述一次网供水管道设于所述燃气热泵的一侧，所述二次网回水管道设于所述燃气热泵的另一侧；The primary network water supply pipeline is arranged on one side of the gas heat pump, and the secondary network return water pipeline is arranged on the other side of the gas heat pump;

所述水热换热单元输出的一次网供水通过所述一次网供水管道进入所述燃气热泵，与所述二次网回水管道中的二次网回水进行热传递；The water supply from the primary network output by the hydrothermal heat exchange unit enters the gas heat pump through the water supply pipeline of the primary network, and conducts heat transfer with the return water of the secondary network in the return water pipeline of the secondary network;

热传递后的所述一次网供水输出所述燃气热泵，重新进入所述水热换热单元进行循环加热。After the heat transfer, the water supply from the primary network is output to the gas heat pump, and re-enters the water-heat heat exchange unit for circulating heating.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：第三换热热力单元；The low-temperature waste heat heat supply system based on single-pipe long-distance transmission according to claim 1, further comprising: a third heat exchange thermal unit;

所述第三换热热力单元包括：电动热泵和换热器；The third heat exchange thermal unit includes: an electric heat pump and a heat exchanger;

所述电动热泵的一侧和所述换热器的一侧通过所述一次网供水管道连通，所述电动热泵的另一侧和所述换热器的另一侧均设置有所述二次网回水管道；One side of the electric heat pump and one side of the heat exchanger are communicated through the primary network water supply pipeline, and the other side of the electric heat pump and the other side of the heat exchanger are both provided with the secondary network return pipe;

所述水热换热单元输出的一次网供水通过所述一次网供水管道依次进入所述换热器、所述电动热泵，与所述二次网回水管道中的二次网回水进行热传递；The primary network water output from the hydrothermal heat exchange unit enters the heat exchanger and the electric heat pump sequentially through the primary network water supply pipeline, and is heated with the secondary network return water in the secondary network return water pipeline. transfer;

热传递后的所述一次网供水输出所述电动热泵，重新进入所述水热换热单元进行循环加热。After the heat transfer, the water supply from the primary network is output to the electric heat pump, and re-enters the water-heat heat exchange unit for circulating heating.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：第四换热热力单元；The low-temperature waste heat heat supply system based on single-pipe long-distance transmission according to claim 1, further comprising: a fourth heat exchange thermal unit;

所述第四换热热力单元包括：电动热泵和吸收式换热器；The fourth heat exchange thermal unit includes: an electric heat pump and an absorption heat exchanger;

所述电动热泵的一侧和所述吸收式换热器的一侧通过所述一次网供水管道连通，所述电动热泵的另一侧和所述吸收式换热器的另一侧均设置有二次网供水管道；One side of the electric heat pump and one side of the absorption heat exchanger are communicated through the primary network water supply pipeline, and the other side of the electric heat pump and the other side of the absorption heat exchanger are both provided with Secondary network water supply pipeline;

所述水热换热单元输出的一次网供水通过所述一次网供水管道依次进入所述吸收式换热器、所述电动热泵，与所述二次网回水管道中的二次网回水进行热传递；The primary network water output from the hydrothermal heat exchange unit enters the absorption heat exchanger, the electric heat pump sequentially through the primary network water supply pipeline, and the secondary network return water in the secondary network return water pipeline. heat transfer;

热传递后的所述一次网供水输出所述电动热泵，重新进入所述水热换热单元进行循环加热。After the heat transfer, the water supply from the primary network is output to the electric heat pump, and re-enters the water-heat heat exchange unit for circulating heating.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：至少一个中继泵；The low-temperature waste heat heat supply system based on single-pipe long-distance transmission according to claim 1, is characterized in that, also comprises: at least one relay pump;

所述中继泵设置于所述长输单管上，用于在输送所述输热介质时提供动力。The relay pump is arranged on the long-distance single pipe, and is used to provide power when transporting the heat transfer medium.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，还包括：至少一个一次网循环泵；The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, further comprising: at least one primary network circulating pump;

所述一次网循环泵设置于所述一次网回水管道和/或所述一次网供水管道上，用于在输送所述一次网回水和所述一次网供水时提供动力。The primary network circulating pump is arranged on the primary network return water pipeline and/or the primary network water supply pipeline, and is used to provide power when conveying the primary network return water and the primary network water supply.
根据权利要求4-10任一项所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to any one of claims 4-10, characterized in that,

所述换热器包括板式换热器。The heat exchanger includes a plate heat exchanger.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

所述低温热源的初始温度在50°以下；The initial temperature of the low-temperature heat source is below 50°;

所述输热介质的初始温度为0-10°。The initial temperature of the heat transfer medium is 0-10°.
根据权利要求1所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to claim 1, characterized in that,

在所述低温余热回收单元内热传递后的所述输热介质的温度为50-80°；The temperature of the heat transfer medium after heat transfer in the low-temperature waste heat recovery unit is 50-80°;

在所述水热换热单元内热传递后的所述输热介质的温度为15°以下。The temperature of the heat transfer medium after heat transfer in the hydrothermal heat exchange unit is below 15°.
根据权利要求7-10任一项所述的基于单管长输的低温余热供热***，其特征在于，The low-temperature waste heat heating system based on single-pipe long-distance transmission according to any one of claims 7-10, characterized in that,

在所述水热换热单元内热传递后得到的所述一次网供水的温度为80-130°；The temperature of the primary network water supply obtained after heat transfer in the hydrothermal heat exchange unit is 80-130°;

与所述一次网供水进行热传递后得到的二次网供水的温度为50°以上。The temperature of the secondary network water supply obtained after heat transfer with the primary network water supply is 50° or higher.