CN212406842U - Stepped recovery low-temperature waste heat power generation system adopting linear generator - Google Patents
Stepped recovery low-temperature waste heat power generation system adopting linear generator Download PDFInfo
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- CN212406842U CN212406842U CN202020989166.1U CN202020989166U CN212406842U CN 212406842 U CN212406842 U CN 212406842U CN 202020989166 U CN202020989166 U CN 202020989166U CN 212406842 U CN212406842 U CN 212406842U
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Abstract
The utility model discloses a step recovery low-temperature waste heat power generation system adopting a linear generator, which comprises a plurality of multistage piston expansion-linear generator waste heat recovery power generation subsystems; the piston expansion-linear generator waste heat recovery power generation subsystem comprises a waste heat evaporator and a plurality of power generation modules, the power generation modules in the piston expansion-linear generator waste heat recovery power generation subsystem are distributed in sequence, each power generation module comprises a piston expansion-linear generator system, a heat exchanger and a liquid storage device, a working medium outlet of the piston expansion-linear generator system is communicated with a heat release side inlet of the heat exchanger, a heat release side outlet of the heat exchanger is communicated with an inlet of the liquid storage device, and the system can utilize the piston expansion-linear generator system to realize the step recycling of low-temperature waste heat power generation.
Description
Technical Field
The utility model relates to a low temperature waste heat recovery power generation system relates to an adopt linear generator's step to retrieve low temperature waste heat power generation system.
Background
Low temperature waste heat sources exist in large numbers in various aspects of industry such as electricity, chemical, metallurgical, processing, manufacturing, and the like. The form of waste heat is many, such as flue gas, waste water, cooling water, and the like. These heat sources have a large amount of heat, but are often difficult to use because of their low temperature, typically below 200 ℃. Although this heat can be used to heat by heat exchange, it is still wasted in summer when no heating is required. At present, some low-temperature waste heat recovery power generation devices exist, most common Organic Rankine Cycle (ORC) waste heat recovery power generation systems exist, and the systems have some problems at present, so that the systems are difficult to popularize and apply greatly. The main problems exist in that the low temperature of the heat source limits the efficiency of the ORC system, the low efficiency causes the cost of the ORC system to be very high, the investment recovery period of the system is very long, and many enterprises are not willing to adopt the system. The main reason is that on the one hand, waste heat sources tend to be not large in scale, often encounter heat sources in the order of hundreds kW or tens kW, for which the turbine size in the ORC system becomes smaller, otherwise high-speed motors with lower efficiency and higher cost must be used, under which conditions the efficiency of the ORC turbine tends to be not high, which further limits the profit margin for waste heat recovery power generation. Meanwhile, even if the turbine is designed at 3000rpm, the dynamic sealing of the rotating machine is a difficult problem in the ORC system, the conventional shaft sealing system cannot avoid 0 leakage, once leakage occurs, the leakage means economic loss of the organic working medium, and if a high-grade sealing system, such as dry gas sealing, is adopted, the cost increase makes the system face a greater challenge. On the other hand, the ORC systems currently use either radial or axial turbines, which are expensive to manufacture. Meanwhile, in order to ensure the normal work of the turbine, the inlet and the outlet of the turbine need to ensure relatively high pressure difference, the larger the pressure difference is, the larger the expansion ratio of the turbine is, the stronger the work-doing capability of the turbine is, and the higher the thermal efficiency of the system is, the more the system needs to adopt equipment such as a pump for pressurization. Therefore, a new technology with higher quality and lower cost is urgently needed to break the dilemma faced by the existing ORC system in the field of waste heat recovery power generation.
The linear generator is almost a generator form which is simultaneous with the rotary generator, and only the rotary generator is more suitable under the condition of high-speed movement, and then the linear generator is only adopted under special conditions. In recent years, attention has been paid to the development of new energy sources such as wave energy and the utilization of linear generators. The linear generator can keep higher efficiency under the relatively lower frequency movement condition, which cannot be realized by a rotary generator, and meanwhile, after the piston expansion-linear generator system is provided with acting parts such as a spring, a piston and the like, the piston expansion-linear generator system can generate electricity by utilizing airflow with very low pressure difference and very low temperature difference, which cannot be realized by a common turbine and a common generator. And such piston expansion-linear generator systems have been widely researched and applied. The characteristics of the piston expansion-linear generator system bring new opportunity for low-temperature waste heat power generation.
However, the single-stage piston expansion-linear generator system can utilize a low-pressure-difference working medium to generate electricity, and simultaneously limits the temperature range of heat recycling of each stage of power generation system, and the smaller the pressure difference of each stage is, the smaller the temperature range of heat recycling is. Therefore, in practical applications, a multi-stage piston expansion-linear generator subsystem combination may be required to recover waste heat source heat.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide an adopt linear generator's step recovery low temperature cogeneration system, this system can utilize piston inflation-linear generator system to realize low temperature cogeneration's step recycle.
In order to achieve the purpose, the step recovery low-temperature waste heat power generation system adopting the linear generator comprises a plurality of multistage piston expansion-linear generator waste heat recovery power generation subsystems;
each stage of piston expansion-linear generator waste heat recovery power generation subsystem comprises a waste heat evaporator and a plurality of power generation modules, each power generation module in the same stage of piston expansion-linear generator waste heat recovery power generation subsystem is sequentially distributed, each power generation module comprises a piston expansion-linear generator system, a heat exchanger and a liquid storage device, a working medium outlet of the piston expansion-linear generator system is communicated with a heat release side inlet of the heat exchanger, and a heat release side outlet of the heat exchanger is communicated with an inlet of the liquid storage device;
in the same-stage piston expansion-linear generator waste heat recovery power generation subsystem, an outlet of a liquid storage device in a first power generation module is communicated with a heat absorption side inlet of a waste heat evaporator, a heat absorption side outlet of the waste heat evaporator is communicated with a working medium inlet of a piston expansion-linear generator system in the first power generation module, an outlet of the liquid storage device in a latter power generation module is communicated with a heat absorption side inlet of a heat exchanger in a former power generation module, a working medium inlet of the piston expansion-linear generator system in the latter power generation module is communicated with a heat absorption side outlet of the heat exchanger in the former power generation module, a heat absorption side inlet of the heat exchanger in the last power generation module is communicated with a cold medium input pipeline, and a heat absorption side outlet of the heat exchanger in the last power generation module is communicated with;
the heat release sides of the waste gas evaporators in the waste heat recovery power generation subsystems of the piston expansion-linear generators at all levels are communicated in sequence.
Along the flow direction of waste gas, the number of the power generation modules in each stage of piston expansion-linear generator waste heat recovery power generation subsystem is gradually reduced.
Working media in the waste heat evaporator and working media in the heat absorption sides of the heat exchangers flow from bottom to top and are gradually evaporated into a gaseous state in the flowing process.
Working media in the heat-radiating sides of the heat exchangers flow from top to bottom and are cooled into liquid in the flowing process.
In the same-stage piston expansion-linear generator waste heat recovery power generation subsystem, the liquid level of liquid working medium in the heat release side of the heat exchanger in the first power generation module is higher than that in the waste heat evaporator, and pressure difference generated by the height difference provides working medium flow and pressure difference required by acting of the piston expansion-linear generator system in the first power generation module; the liquid level of the liquid working medium in the heat-radiating side of the heat exchanger in the next power generation module is higher than the liquid level in the heat-absorbing side of the heat exchanger in the previous power generation module, and the pressure difference generated by the height provides the pressure difference required by the working medium flowing in the next power generation module and the work of the piston expansion-linear generator system.
The utility model discloses following beneficial effect has:
adopt linear generator's step to retrieve low temperature waste heat power generation system when concrete operation, waste heat working medium enters into in proper order and releases heat in the waste heat evaporimeter among the piston expansion-linear generator waste heat recovery power generation subsystem of each grade to give piston expansion-linear generator waste heat recovery power generation subsystem of each grade with the heat release, in order to realize thermal utilization step by step, the piston expansion-linear generator system among each power generation module utilizes this heat to generate electricity, in order to realize utilizing piston expansion-linear generator system to realize low temperature waste heat power generation's step recycle's purpose.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a power generation module, 2 is a waste heat evaporator, 3 is a piston expansion-linear generator system, 4 is a heat exchanger, and 5 is a liquid storage device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the cascade recovery low temperature waste heat power generation system using linear generator of the present invention includes a plurality of multistage piston expansion-linear generator waste heat recovery power generation subsystems; each stage of piston expansion-linear generator waste heat recovery power generation subsystem comprises a waste heat evaporator 2 and a plurality of power generation modules 1, each power generation module 1 in the same stage of piston expansion-linear generator waste heat recovery power generation subsystem is sequentially distributed, each power generation module 1 comprises a piston expansion-linear generator system 3, a heat exchanger 4 and a liquid storage device 5, a working medium outlet of the piston expansion-linear generator system 3 is communicated with a heat release side inlet of the heat exchanger 4, and a heat release side outlet of the heat exchanger 4 is communicated with an inlet of the liquid storage device 5; in the same-stage piston expansion-linear generator waste heat recovery power generation subsystem, an outlet of a liquid storage device 5 in a first power generation module 1 is communicated with a heat absorption side inlet of a waste heat evaporator 2, a heat absorption side outlet of the waste heat evaporator 2 is communicated with a working medium inlet of a piston expansion-linear generator system 3 in the first power generation module 1, an outlet of the liquid storage device 5 in a subsequent power generation module 1 is communicated with a heat absorption side inlet of a heat exchanger 4 in a previous power generation module 1, a working medium inlet of the piston expansion-linear generator system 3 in the subsequent power generation module 1 is communicated with a heat absorption side outlet of the heat exchanger 4 in the previous power generation module 1, a heat absorption side inlet of the heat exchanger 4 in the last power generation module 1 is communicated with a cold medium input pipeline, and a heat absorption side outlet of the heat exchanger 4 in the last power generation module 1 is communicated with, the cooling medium in the cooling medium input pipeline is cold air or cold water; the heat release sides of the waste gas evaporators in the waste heat recovery power generation subsystems of the piston expansion-linear generators at all levels are communicated in sequence.
Along the flow direction of waste gas, the number of the power generation modules 1 in each stage of piston expansion-linear generator waste heat recovery power generation subsystem is gradually reduced; working media in the waste heat evaporator 2 and working media in the heat absorption sides of the heat exchangers 4 flow from bottom to top and are gradually evaporated into a gas state in the flowing process; the working medium in the heat-radiating side of each heat exchanger 4 flows from top to bottom and is cooled into liquid state in the flowing process.
The utility model discloses a concrete working process does:
the waste heat working medium is subjected to heat release through the heat release side of a waste heat evaporator 2 in the stage piston expansion-linear generator waste heat recovery power generation subsystem in sequence;
in the same piston expansion-linear generator waste heat recovery power generation subsystem, an output working medium of a liquid storage device 5 in a first power generation module 1 enters a heat absorption side of a waste heat evaporator 2 from bottom to top to be gradually evaporated into a gas state, then enters a piston expansion-linear generator system 3 in the first power generation module 1 to do work, and the working medium output by the piston expansion-linear generator system 3 in the first power generation module 1 enters a heat release side of a heat exchanger 4 in the first power generation module 1 from top to bottom to be gradually condensed into liquid, and then enters the liquid storage device 5 in the first power generation module 1;
the output working medium of the liquid storage device 5 in the next power generation module 1 enters the heat absorption side of the heat exchanger 4 in the previous power generation module 1 from bottom to top to be gradually evaporated into a gas state, then enters the piston expansion-linear generator system 3 in the next power generation module 1 to do work, the working medium output by the piston expansion-linear generator system 3 in the next power generation module 1 enters the heat release side of the heat exchanger 4 in the next power generation module 1 from top to bottom to be gradually condensed into liquid, and then enters the liquid storage device 5 in the next power generation module 1.
In the same-stage piston expansion-linear generator waste heat recovery power generation subsystem, the liquid level of the liquid working medium in the heat release side of the heat exchanger 4 in the first power generation module 1 is higher than that in the waste heat evaporator 2, and the pressure difference generated by the height difference provides working medium flow and the pressure difference required by the piston expansion-linear generator system 3 in the first power generation module 1 to do work; the liquid level of the liquid working medium in the heat releasing side of the heat exchanger 4 in the next power generation module 1 is higher than the liquid level in the heat absorbing side of the heat exchanger 4 in the previous power generation module 1, and the pressure difference generated by the height provides the pressure difference required by the working medium flowing in the next power generation module 1 and the work of the piston expansion-linear generator system 3, so that the system does not need to adopt equipment such as a pump for pressurization, and the system is simplified to the greatest extent. Meanwhile, the pressure difference required by the power generation system is small, so that the pressure of the whole system can be low, the pressure grade of the system can be reduced, the adoption of cheaper materials and a processing and manufacturing process can be facilitated, and the cost of the system can be further reduced. Meanwhile, as the motion frequency and the speed of the piston expansion-linear generator system 3 are lower, the difficulty of shaft seal is greatly reduced, and a cheaper shaft seal form such as graphite can be adopted, so that the cost is greatly reduced.
The waste heat recovery power generation subsystem comprises a plurality of stages of piston expansion-linear generator waste heat recovery power generation subsystems, wherein the plurality of stages of piston expansion-linear generator waste heat recovery power generation subsystems are connected in series along the flowing direction of waste heat carrying fluid (such as flue gas and waste water), the temperature of the flue gas or the waste water is gradually reduced, the recovery temperature grade of the single-stage piston expansion-linear generator waste heat recovery power generation subsystem is also gradually reduced, the grade of the piston expansion-linear generator waste heat recovery power generation subsystem is determined according to the temperature of a waste heat source, the kind of working media selected by the piston expansion-linear generator waste heat recovery power generation subsystem and other factors, and each stage of.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A cascade recovery low-temperature waste heat power generation system adopting a linear generator is characterized by comprising a plurality of multistage piston expansion-linear generator waste heat recovery power generation subsystems;
each stage of piston expansion-linear generator waste heat recovery power generation subsystem comprises a waste heat evaporator (2) and a plurality of power generation modules (1), each power generation module (1) in the same stage of piston expansion-linear generator waste heat recovery power generation subsystem is sequentially distributed, each power generation module (1) comprises a piston expansion-linear generator system (3), a heat exchanger (4) and a liquid storage device (5), a working medium outlet of the piston expansion-linear generator system (3) is communicated with a heat release side inlet of the heat exchanger (4), and a heat release side outlet of the heat exchanger (4) is communicated with an inlet of the liquid storage device (5);
in the same-stage piston expansion-linear generator waste heat recovery power generation subsystem, an outlet of a liquid storage device (5) in a first power generation module (1) is communicated with a heat absorption side inlet of a waste heat evaporator (2), a heat absorption side outlet of the waste heat evaporator (2) is communicated with a working medium inlet of a piston expansion-linear generator system (3) in the first power generation module (1), an outlet of the liquid storage device (5) in a subsequent power generation module (1) is communicated with a heat absorption side inlet of a heat exchanger (4) in a previous power generation module (1), a working medium inlet of the piston expansion-linear generator system (3) in the subsequent power generation module (1) is communicated with a heat absorption side outlet of the heat exchanger (4) in the previous power generation module (1), and a heat absorption side inlet of the heat exchanger (4) in the last power generation module (1) is communicated with a cold medium input pipeline, the heat absorption side outlet of the heat exchanger (4) in the last power generation module (1) is communicated with the cold medium output pipeline;
the heat release sides of the waste gas evaporators in the waste heat recovery power generation subsystems of the piston expansion-linear generators at all levels are communicated in sequence.
2. The cascade recovery low temperature waste heat power generation system using linear generators as claimed in claim 1, wherein the number of power generation modules (1) in each stage of piston expansion-linear generator waste heat recovery power generation subsystem is gradually reduced along the exhaust gas flow direction.
3. The cascade recovery low-temperature waste heat power generation system adopting the linear generator as claimed in claim 1, wherein the working medium in the waste heat evaporator (2) and the working medium in the heat absorption side of each heat exchanger (4) flow from bottom to top and gradually evaporate into a gaseous state in the flowing process.
4. The cascade recovery low-temperature waste heat power generation system adopting the linear generator as claimed in claim 1, wherein the working medium in the heat-releasing side of each heat exchanger (4) flows from top to bottom and is cooled to be liquid in the flowing process.
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| CN202020989166.1U CN212406842U (en) | 2020-06-02 | 2020-06-02 | Stepped recovery low-temperature waste heat power generation system adopting linear generator |
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| CN202020989166.1U CN212406842U (en) | 2020-06-02 | 2020-06-02 | Stepped recovery low-temperature waste heat power generation system adopting linear generator |
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