CN210861047U

CN210861047U - Heat energy recycling double-circulation system based on steam generator

Info

Publication number: CN210861047U
Application number: CN201921305259.1U
Authority: CN
Inventors: 温秀峰; 詹仰东; 崔金峰
Original assignee: Zhejiang Juanyue Water Technology Co ltd
Current assignee: Zhejiang Juanyue Water Technology Co ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-26
Anticipated expiration: 2029-08-13

Abstract

The utility model belongs to the boiler energy-saving field of recycling, concretely relates to two circulation system are recycled to heat energy based on steam generator, including steam generator and the flue gas heat absorption circulation system that is linked together with the steam generator water tank, flue gas heat absorption circulation system comprises low temperature economizer, income water tank, play water tank and circulating pump. The utility model discloses utilize the part heat transfer module of low temperature economizer to be used for the steam generation system, satisfy steam user's demand, reduce the quantity of new steam, reach energy saving and consumption reduction's purpose. Particularly, a part of components of the low-temperature economizer are taken for generating steam; the output of heat exchange quantity is ensured through a large-flow circulating system arranged in the system, and the stability of output steam quantity is ensured by matching with an independently designed high-efficiency steam generator. The conservative estimation can save ten percent of energy consumption, and has the significance of simplicity, practicability, and great positive and effective in the field.

Description

Heat energy recycling double-circulation system based on steam generator

Technical Field

The utility model belongs to the boiler energy-saving field of recycling, concretely relates to double circulation system is recycled to heat energy based on steam generator.

Background

In 2015, 1 month, development and improvement committee issued "national key energy-saving low-carbon technology popularization catalogue", wherein the core of the popularized comprehensive optimization system for flue gas of a thermal power plant, namely the waste heat deep recovery technology, is to additionally install a low-temperature economizer. The requirements of the national institute of energy and power improvement, environmental protection department and national energy agency on the power supply and coal consumption of the units are in the documents of coal and electricity energy conservation, emission reduction, upgrade and transformation action plan (2014-2020).

The Economizer (Economizer) is a device which is arranged at the lower part of a flue at the tail part of a boiler and is used for recovering the waste heat of exhausted smoke, water fed by the boiler is heated into a heating surface of saturated water under the pressure of a steam drum, and the Economizer is called as the Economizer because the Economizer absorbs the heat of high-temperature smoke, reduces the exhaust temperature of the smoke, saves energy and improves the efficiency.

The steel pipe type economizer is not limited by pressure, can be used as a boiling type economizer and is generally made of carbon steel pipes with the outer diameter of 32-51 mm. Fins and fins are sometimes added to the tube to improve heat transfer. The steel pipe type economizer consists of parallel elbow pipes (commonly called coiled pipes) which are horizontally arranged.

The coal economizer is mainly suitable for the industry, and is gradually popularized to the agriculture and the related industries for business.

According to the degree to which the water is heated: it can be classified into non-boiling type and boiling type.

The method comprises the following steps of: there are cast iron and steel tube coal economizer. The non-boiling type coal economizer is mostly made of cast iron, but is also made of steel pipes, and the boiling type coal economizer is only made of steel pipes. The cast iron economizer is mainly applied to boilers with the pressure less than or equal to 2.5 MPa. If the pressure exceeds 2.5MPa, the coal economizer made of steel pipes is adopted.

The coal economizer is divided into the following parts in the form of devices: there are vertical and horizontal types. Dividing according to the relative flow direction of the exhaust smoke and the water supply: there are three types, forward flow, reverse flow and mixed. According to the structural form: light pipe economizers and finned economizers. The finned economizer comprises: h-type economizers (used more) and helical fin economizers. According to the heat conduction mode: direct conduction and indirect conduction;

during the starting process of the boiler, because the circulation of the steam-water pipeline is not established, namely the boiler feed water is in a stagnation state, the water in the economizer is in a non-flowing state at the moment. Along with the enhancement of boiler combustion and the increase of the flue gas temperature, water in the economizer is easy to vaporize, so that the local part of the economizer is in an over-temperature state.

A low-temperature economizer system is installed in a flue of a boiler at present, and the problem that the exhaust gas temperature of the boiler is high is solved. The exhaust gas temperature is generally designed to be about 120-140 ℃, in China, the exhaust gas temperature of a boiler with a large number of running units is higher than the design value by 20-30 ℃, and basically, the waste heat of the exhaust gas is utilized to heat condensed water or the condensed water is utilized in a grading manner to supply heat for a boiler air heater. The heat exchange of the low-temperature economizer is carried out between flue gas and water, and the utilization of the low-temperature flue gas waste heat of the boiler is single. The problem that the heat energy cannot be effectively utilized and the coverage area is narrow is solved.

SUMMERY OF THE UTILITY MODEL

To above-mentioned boiler low temperature flue gas waste heat utilization singleness, the narrower problem of heat energy utilization cover face, the utility model provides a steam system based on boiler low temperature economizer, its technical scheme as follows:

a heat energy recycling double-circulation system based on a steam generator comprises the steam generator and a smoke heat absorption circulation system communicated with a water tank of the steam generator, wherein the smoke heat absorption circulation system consists of a low-temperature economizer, a water inlet tank, a water outlet tank and a circulation pump; the low-temperature economizer is arranged in the flue of the steam generator;

a water circulation path from the steam generator water tank to the inlet water tank to the low temperature economizer to the outlet water tank back to the steam generator water tank; the circulating pump is located on a circulating path between the steam generator and the water inlet tank.

Further, a recycling door is arranged at the water inlet of the water inlet tank, the water outlet of the water outlet tank and between the water inlet and the water outlet of the water inlet tank.

Furthermore, the joint of the steam generator and the water inlet tank is a water outlet, the joint of the steam generator and the water outlet tank is a water inlet, and the height of the water outlet is lower than that of the water inlet.

Furthermore, a temperature sensor is arranged in the flue and connected with the circulating pump through a controller.

The utility model discloses utilize the part heat transfer module of low temperature economizer to be used for the steam generation system, satisfy steam user's demand, reduce the quantity of new steam, reach energy saving and consumption reduction's purpose. Particularly, a part of components of the low-temperature economizer are taken for generating steam; the output of heat exchange quantity is ensured through a large-flow circulating system arranged in the system, and the stability of output steam quantity is ensured by matching with an independently designed high-efficiency steam generator. The conservative estimation can save ten percent of energy consumption, and has the significance of simplicity, practicability, and great positive and effective in the field.

Drawings

FIG. 1 is a schematic view of a complete cycle system according to example 2;

reference numerals: the system comprises a low-temperature economizer 1, a water inlet tank 2, a water outlet tank 3, a circulating pump 4, a steam generator 5, a steam heater 11, a liquid level control valve 6, a condensate pump 7 and a condensate tank 8.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A heat energy recycling double-circulation system based on a steam generator comprises the steam generator 5 and a flue gas heat absorption circulation system communicated with a water tank of the steam generator 5, wherein the flue gas heat absorption circulation system consists of a low-temperature economizer 1, a water inlet tank 2, a water outlet tank 3 and a circulating pump 4; the low-temperature economizer 1 is arranged in a flue of the steam generator 5;

the water circulation path is from the water tank of the steam generator 5 to the water inlet tank 2 to the low-temperature economizer 1 to the water outlet tank 3 and back to the water tank of the steam generator 5; the circulation pump 4 is located on a circulation path between the steam generator 5 and the water inlet tank 2.

The device that this embodiment provided is equipped with low temperature economizer 1 in steam generator 5's flue, and with low temperature economizer 1 access steam circulation pipeline, make the inside demineralized water of steam generator 5 can be through circulating pump to low temperature economizer 1 inside, absorb the heat in the flue, then the rivers of higher temperature return steam generator, so avoided the flue internal temperature too high promptly, draw heat energy from the flue region with the form of rising the temperature water again, can be better for steam consumer energy supply, accurate the reasonable recovery and the reuse of thermal compensation.

Example 2

The embodiment is further defined on the basis of embodiment 1, and a complete set of circular paths will be presented in the embodiment to facilitate the overall and partial explanation of the technical solution so as to more clearly present the advantages of the present technology. Refer to fig. 1.

The system flow is as follows: supply to low temperature economizer by the circulating pump with the demineralized water in the steam generator and go into water tank 2, through going into in the heat exchange assemblies that water tank 2 got into low temperature economizer 1, water after the heat absorption gets into low temperature economizer 1 and goes out case 3, get into in steam generator 5 by the pipe connection, the continuous circulation heating of water in the steam generator 5, steam by steam generator 5 production, carry to steam heater 11 through steam conduit and be the steam heat source user promptly, steam meets the water entering condensate water tank 8 of condensation, the condensate water passes through condensate pump 7 and carries steam generator 5, whole device forms a closed circulation system. The condensate water tank 8 can be connected with a water replenishing pipe, a liquid level control valve 6 can be arranged on a return path of the condensate water pump 7 and the steam generator 5, and the liquid level control valve 6 replenishes water according to the height of the inner page of the steam generator 5. The condensation water tank 8 can be externally connected with a vacuum pump 9 to assist in exhausting air.

Compared with the prior art, the low-temperature economizer 1 in the flue of the steam generator 5 is used as a part of the water heated by the whole steam generator 5, and the device can save about percent of energy.

Example 3

The embodiment is improved on the basis of the embodiment 2, the joint of the steam generator 5 and the water inlet tank 2 is a water outlet, the joint of the steam generator and the water outlet tank 3 is a water inlet, and the height of the water outlet is lower than that of the water inlet. So set up can be preferred from the water that goes out nearer the bottom, let the water that heats of backward flow arrive higher position earlier. A temperature sensor is arranged in the flue and connected with the circulating pump through a controller. When the flue temperature of the steam generator 5 is too high, the temperature sensor phase controller sends a command to increase the power of the circulating pump 4, and the circulating pump 4 can adopt a multi-gear pump or a variable pump, which is not further explained herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A double circulation system for recycling heat energy based on a steam generator is characterized in that the circulation system comprises the steam generator and a smoke heat absorption circulation system communicated with a water tank of the steam generator, and the smoke heat absorption circulation system consists of a low-temperature economizer, a water inlet tank, a water outlet tank and a circulation pump; the low-temperature economizer is arranged in the flue of the steam generator;

the water circulation path is from the steam generator water tank to the water inlet tank, then to the low-temperature economizer, then to the water outlet tank, and finally back to the steam generator water tank; the circulating pump is located on a circulating path between the steam generator and the water inlet tank.

2. The steam generator-based dual thermal energy recycling cycle system of claim 1, wherein a recirculation door is provided between the inlet tank inlet, the outlet tank outlet, and both.

3. The steam generator-based dual cycle system for recycling heat energy of claim 2, wherein the steam generator is connected with the water inlet tank through a water outlet, the water outlet is connected with the water outlet tank through a water inlet, and the water outlet is lower than the water inlet.

4. The steam generator-based dual heat energy recycling system of claim 1, wherein a temperature sensor is disposed in the flue, and the temperature sensor is connected to the circulating pump via a controller.