CN208205498U - A kind of absorption soil source heat pump system of twin-stage of fume afterheat driving - Google Patents

Abstract

The utility model provides a two-stage absorption soil source heat pump system driven by flue gas waste heat, which includes a flue gas waste heat utilization subsystem, a heat absorption heat pump subsystem, and a soil source utilization subsystem; the soil source utilization subsystem includes a shallow ground Thermal energy heat exchange device; the heat absorption heat pump subsystem includes a heating machine and a refrigerator; the heating machine receives the smoke exhaust from the flue gas waste heat utilization subsystem and the circulating water after heat exchange through the shallow geothermal energy heat exchange device enters the heating machine. After heating, the return water of the user heating circulating water is output as the feed water of the user heating circulating water; after the refrigerator receives the waste heat of the flue gas and utilizes the exhaust smoke of the subsystem for heat-cold exchange, the return water of the user refrigeration cycle entering the refrigerator is After cooling, it is output as the feed water of the user's refrigeration cycle water. Through multi-energy complementary coupling, the utility model can not only flexibly adjust the utilization of shallow geothermal energy, but also ensure the energy demand of users, improve the energy supply stability of renewable energy, and reduce waste heat waste and thermal pollution.

Description

A two-stage absorption ground source heat pump system driven by flue gas waste heat

technical field

The utility model relates to the technical field of low-grade waste heat utilization, in particular to a two-stage absorption soil source heat pump system driven by flue gas waste heat.

Background technique

Energy and environmental issues are two prominent issues restricting sustainable economic and social development. Distributed energy systems are usually based on renewable energy and clean fuels, arranged near the demand side, directly facing users, and supplying a variety of energy on demand. Green comprehensive energy supply system. Renewable energy has the characteristics of low energy flow density, relatively dispersed distribution, and small scale. Conventional energy utilization methods are difficult to efficiently utilize it. Therefore, research on new distributed energy supply systems that complement each other with clean fossil fuels and renewable energy Significant.

The shallow layer of the ground is a huge solar collector, which collects 47% of the solar energy, and the soil source is a nearly unlimited renewable energy source, which is also a clean energy source. A single soil source utilization scheme is greatly affected by soil properties. How to realize the efficient coupling of shallow geothermal energy and gas distributed energy has become a practical technical problem to be solved urgently by those skilled in the art.

Utility model content

The technical problem that the utility model solves:

The utility model provides a two-stage absorption soil source heat pump system driven by waste heat of flue gas, which realizes efficient coupling of shallow geothermal energy and gas distributed energy.

The technical scheme that the utility model adopts:

A two-stage absorption ground source heat pump system driven by flue gas waste heat, including:

The flue gas waste heat utilization subsystem that provides smoke exhaust; the heat absorption heat pump subsystem that obtains the smoke exhaust of the flue gas waste heat utilization subsystem; the soil source utilization subsystem that communicates with the heat absorption heat pump subsystem for heat exchange;

The soil source utilization subsystem includes a shallow geothermal energy heat exchange device 5 for exchanging heat with the geothermal and heat-absorbing heat pump subsystems;

The endothermic heat pump subsystem includes a heating machine 3 and a refrigerator 4;

The heating machine 3 receives the smoke exhaust from the flue gas waste heat utilization subsystem and the circulating water after heat exchange by the shallow geothermal energy heat exchange device 5. After heating the return water of the user heating circulating water entering the heating machine 3, it is used as the user heating cycle The water supply is output, and at the same time, the circulating water of the shallow geothermal energy heat exchange device 5 that has been cooled by heat exchange is re-sent to the shallow geothermal energy heat exchange device 5 for heat exchange and temperature rise;

Refrigerator 4 receives the waste heat of flue gas and utilizes the exhaust smoke of the subsystem for heat-cold exchange, and then cools the return water of the user's refrigeration cycle entering into the refrigerator 4, and outputs it as the feed water of the user's refrigeration cycle water; at the same time, during the cooling process The generated heat will be heated by the circulating water of the shallow geothermal energy heat exchange device 5, and then re-sent to the shallow geothermal energy heat exchange device 5 for heat exchange and cooling.

Further, the soil source utilization subsystem also includes a U-shaped buried pipe device 6, and the medium in the pipeline of the U-shaped buried pipe device 6 enters the shallow geothermal energy heat exchange device 5 for heat exchange, and then re-enters the U-shaped buried pipe device 6. Type buried pipe device 6.

Further, the heating machine 3 of the endothermic heat pump subsystem is a first-type heat-increasing absorption heat pump, including a generator _IGH , a condenser ICH, an evaporator _IEH , and an absorber _IAH ; the _{generator IGH} The air inlet of the evaporator receives the smoke exhaust from the waste heat utilization subsystem of the flue gas, and the exhaust smoke from the outlet of the generator IG _H is discharged into the atmosphere; the water inlet of the evaporator IE _H is connected to the circulating water outlet of the shallow geothermal energy heat exchange device 5, and evaporates The water outlet of _{EH is connected to the circulating water inlet of shallow geothermal energy heat exchange device 5; the water inlet of absorber IA H is} connected to the return water of user heating circulating water, and the water outlet of condenser _ICH is connected to the user’s heating circulating water water supply;

The refrigerator 4 of the endothermic heat pump subsystem is an absorption refrigeration device, including a generator _IIGC , a condenser _IICC , an evaporator _IIEC , and an absorber _IIAC ; the air inlet of the generator _IIGC receives flue gas The smoke exhaust from the waste heat utilization subsystem and the exhaust smoke from the outlet of the generator _IIGC are discharged into the atmosphere; the water inlet of the evaporator _IIEC is connected to the return water of the user's refrigeration circulation water, and the water outlet of the evaporator _IIEC is connected to the user's refrigeration circulation water For water supply, the water inlet of the absorber ⅡA _H is connected to the circulating water outlet of the shallow geothermal energy heat exchange device 5, and the water outlet of the condenser ⅡCH _H is connected to the circulating water inlet of the shallow geothermal energy heat exchange device 5.

Further, a valve IV _G1 is set on the pipe connecting the flue gas waste heat utilization subsystem with the inlet of the generator IG _H of the heating machine 3, and the water outlet of the evaporator IE _H is connected to the shallow geothermal energy heat exchange device 5 A valve IIIV _H2 is set on the pipeline connected to the circulating water inlet of the shallow geothermal energy heat exchange device 5, and a valve VV _H1 is set on the pipeline connected to the water inlet of the evaporator IE _H between the circulating water outlet of the shallow geothermal energy heat exchange device 5;

_A valve IIV _G2 is set on the pipe connecting the flue gas waste heat utilization subsystem with the air inlet of the generator _IIGC of the refrigerator 4; A valve _{IVV C2} is provided on the pipeline between the water inlets, and a valve VIV _C1 is provided on the pipeline connecting the circulating water outlet of the shallow geothermal energy heat exchange device 5 with the water inlet of the absorber IIAC;

When the heating machine 3 is working, valve IV _G1 , valve III V _H2 and valve V V _H1 are opened, and valve II V _G2 , valve IV V _C2 and valve VI V _C1 are closed;

When the refrigerator 4 is working, the valves IIVG2, IVVC2 and VIVC1 are opened, and the valves IVG1, IIIVH2 and VVH1 are closed.

Further, the flue gas waste heat utilization subsystem includes a sequentially connected fuel power conversion device 1 and a waste heat cooling and heating device 2, the fuel power conversion device 1 is an internal combustion unit; the waste heat cooling and heating device 2 is a flue gas heating Water type absorption heat pump.

The beneficial effects of the utility model:

(1) The use of absorption heat pump technology realizes the efficient recovery and utilization of low-grade flue gas waste heat and shallow geothermal energy, realizes the coupling of gas-fired combined cooling, heating and power technology and soil source heat pump technology, and improves the energy supply of renewable energy Stability, reducing waste heat waste and thermal pollution;

(2) The absorption heat pump uses flue gas as the driving heat source, and the energy consumption of the absorption heat pump is less than that of the electric-driven soil source heat pump, which improves the comprehensive energy utilization rate of the multi-energy complementary system.

(3) Through multi-energy complementary coupling, it can not only flexibly adjust the utilization of shallow geothermal energy, but also ensure the energy demand of users, maintain the energy balance in the soil, and realize the sustainable utilization of renewable energy.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them, 1-fuel power conversion device; 2-waste heat cooling and heating device; 3-heating machine; 4-refrigerating machine; 5-shallow geothermal energy heat exchange device; 6-U-shaped buried pipe device;

S1, S2, S3, S4, S5, S6 are flue gas;

W1, W2, W3, W4, W5, and W6 are circulating water for shallow geothermal energy heat exchangers;

D1 and D2 are U-shaped buried pipe circulating water;

L1, L2, L3, and L4 are circulating water for user air conditioners;

VG1, VG2, VC1, VC2, VH1, VH2 are valves.

Detailed ways

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

The embodiment of the utility model discloses a two-stage absorption soil source heat pump system driven by flue gas waste heat, which realizes the complementary coupling of gas cooling, heating and power triple supply technology and soil source heat pump technology, and improves the energy supply stability of renewable energy , reducing waste heat waste and thermal pollution.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Specifically, as shown in Figure 1, the utility model provides a two-stage absorption soil source heat pump system driven by flue gas waste heat, including a flue gas waste heat utilization subsystem, and the flue gas waste heat utilization subsystem uses gas cooling and heating power The triple supply system provides exhaust smoke S2 as the driving heat source of the heat-absorbing heat pump subsystem; the exhaust smoke S2 enters the heat-absorbing heat pump subsystem for heating, and also includes the use of soil sources connected to the heat-absorbing heat pump subsystem for heat exchange subsystem.

Among them, the soil source utilization subsystem includes a shallow geothermal energy heat exchange device 5 for exchanging heat between the underground heat and the above-ground heat-absorbing heat pump subsystem, and also includes a U-shaped underground pipe device 6 buried underground, where U The medium D1 (such as circulating hot water) in the U-shaped pipe of the buried pipe device 6 enters the shallow geothermal energy heat exchange device 5 for heat exchange, and the medium D2 after heat exchange returns to the U-shaped pipe. A heat exchange tube can be arranged inside the shallow geothermal energy heat exchange device 5, and the heat exchange tube communicates with the medium pipeline of the U-shaped underground pipe device 6 and also communicates with the endothermic heat pump subsystem.

The endothermic heat pump subsystem includes a heating machine 3 and a refrigerator 4. The heating machine 3 is used to heat the user's heating circulating water to heat the user, and the refrigerator 4 is used to cool the user's refrigeration circulating water to cool the user. Wherein, the user heating circulating water and the user cooling circulating water can use the same circulating pipe, and connect the heating machine 3 or the refrigerator 4 in different seasons to realize heating or cooling. The heating machine 3 uses the exhaust smoke S2 as the driving heat source, and uses the circulating water W5 of the shallow geothermal energy heat exchange device 5 as the low-temperature heat source to realize heat supply, while the refrigerator 4 uses the exhaust smoke S2 as the high-temperature heat source, and uses the shallow geothermal energy for heat exchange. The circulating water W2 of the thermal device 5 is used as cooling water to realize cooling.

Among them, in the system shown in Figure 1, the heating machine 3 receives the exhaust smoke S2 of the flue gas waste heat utilization subsystem and the circulating water inlet W4 after heat exchange by the shallow geothermal energy heat exchange device 5, and the heating machine 3 The return water L3 of the user's heating circulating water is heated, and the heated circulating water is output to the user as the supply water L4 of the user's heating circulating water for heating; at the same time, the heating machine 3 converts the shallow geothermal energy heat exchange device 5 that has been cooled by heat exchange The influent water W5 is re-sent to the shallow geothermal energy heat exchange device 5 as the circulating water inflow W6 for heat exchange and temperature rise, and the circulating water effluent W1 after heat exchange and temperature rise enters the heating machine 3 again.

The refrigerating machine 4 receives the waste heat of the flue gas and utilizes the smoke exhaust of the subsystem to heat the generator, and the refrigerant evaporates in the evaporator and absorbs the heat of the return water L1 of the user's refrigerating circulating water entering the refrigerating machine 4, and heats up the user's refrigerating circulating water. After cooling down, the feed water L2 used as the user’s refrigeration circulating water is output to the user for cooling; while in the refrigeration cycle process, the heat generated by the absorber and the condenser has a great impact on the circulating water W2 entering the shallow geothermal energy heat exchange device 5 of the refrigerator 4 After heating, the incoming water W4 which is used as the circulating water of the shallow geothermal energy heat exchange device 5 enters the shallow geothermal energy heat exchange device 5 for heat exchange and cooling, and the cooled circulating water outlet W1 enters the refrigerator 4 again as cooling water cycle.

As a specific implementation, the heat generator 3 of the above-mentioned endothermic heat pump subsystem is a first-type heat-increasing absorption heat pump, including a generator IGH, a condenser ICH, an evaporator IEH, and an absorber IAH; The air inlet of IGH receives the flue gas waste heat utilization subsystem, and the exhaust smoke of the flue gas waste heat utilization subsystem enters the air inlet of the generator GH as the exhaust smoke S3 of the heating machine 3, and the air outlet of the generator IGH serves as the exhaust port to The cooled flue gas S5 is discharged into the atmosphere; the water inlet of the evaporator IEH is connected to the circulating water outlet W3 of the shallow geothermal energy heat exchange device 5, and the water outlet of the evaporator IEH is connected to the circulating water inlet of the shallow geothermal energy heat exchange device 5 W5; the water inlet of the absorber IAH is connected to the return water L3 of the user's heating circulating water, and the water outlet of the condenser ICH is connected to the supply water L2 of the user's heating circulating water.

When the above-mentioned heating machine 3 is working, after the generator _IGH receives the exhaust smoke S4, it heats the dilute solution in the generator _IGH to evaporate and precipitate the refrigerant. After being compressed, it enters the evaporator IE _H to absorb heat and become a low-pressure steam. The low-pressure steam is absorbed by the concentrated solution in the absorber IA _H to become a dilute solution, and the dilute solution returns to the generator to complete the cycle. The absorber and condenser are exothermic processes. The user refrigeration cycle water enters the absorber and condenser in turn for heating. The heated user refrigeration cycle outlet water completes heat exchange on the user side, and the user refrigeration cycle return water re-enters the absorber inlet. The evaporator is a heat-absorbing process, the circulating water of the shallow geothermal energy heat exchange device 5 enters the evaporator to release heat, and the cooled circulating water of the shallow geothermal energy heat exchange device 5 enters the shallow geothermal energy heat exchange device 5 for heat exchange After that, it enters the circulation again as cooling water.

The refrigerator 4 of the endothermic heat pump subsystem is an absorption refrigeration device, including a generator _IIGC , a _{condenser IICC} , an evaporator _IIEC , and an absorber _IIAC ; The exhaust smoke S ₄ sent by the subsystem, the gas outlet of the generator Ⅱ G _C discharges the heat-exchanged flue gas S ₆ into the atmosphere; the water inlet of the evaporator Ⅱ E _C is connected to the return water L ₁ of the user’s refrigeration circulating water, and the evaporator Ⅱ E The water outlet of _C is used as the supply water L ₂ of the user's refrigeration circulating water, the water inlet of the absorber ⅡA _C is connected to the circulating water outlet W ₂ of the shallow geothermal energy heat exchange device 5, and the water outlet of the condenser ⅡC _C is connected to the shallow geothermal energy exchange The circulating water of the heating device 5 is water W ₄ .

When the above-mentioned refrigerator ₄ is working, after the generator _IIGC receives the exhaust smoke S4, the dilute solution in the generator IIGC is heated to evaporate and precipitate the refrigerant, and the gaseous refrigerant enters the condenser _{IICC C} to release heat and condense to become a liquid state. After decompression, it enters the evaporator _IIEC to absorb heat and becomes low-pressure steam. The low _- pressure steam is absorbed by the concentrated solution in the absorber IIAC to become a dilute solution, and the dilute solution returns to the generator to complete the cycle. The evaporator is a heat-absorbing process that cools the user's refrigeration cycle water. After cooling, the user's refrigeration cycle outlet water completes heat exchange on the user side, and the user's refrigeration cycle return water enters the evaporator again. In this circulation process, the condenser and the absorber are exothermic processes, and the circulating water of the shallow geothermal energy heat exchange device 5 enters the absorber and the condenser in turn to absorb heat, and the heated circulating water of the shallow geothermal energy heat exchange device 5 After entering the shallow geothermal energy heat exchange device 5 for heat exchange, it enters the circulation again as cooling water.

In order to better control the cooling and heating supply, a valve IV _G1 is set on the pipeline connecting the flue gas waste heat utilization subsystem with the generator G _H inlet of the heating machine 3, and the water outlet of the evaporator E _H is connected with the shallow A valve IIIV _H2 is set on the pipe connecting the circulating water inlet of the geothermal energy heat exchange device 5 in the upper layer, and a valve is installed on the pipe connecting the circulating water outlet of the shallow geothermal energy heat exchange device 5 and the water inlet of the evaporator IE _H VV _H1 .

There is a valve II V _G2 on the pipe connecting the flue gas waste heat utilization subsystem with the inlet of the generator _{G C} of the refrigerator 4; A valve _{IVV C2} is set on the pipeline between them, and a valve VIV _C1 is set on the pipeline connecting the circulating water outlet of the shallow geothermal energy heat exchange device 5 with the water inlet of the absorber AC.

When the heating machine 3 is working, the valve IV _G1 , valve III V _H2 , and valve V V _H1 are open, and the valve II V _G2 , valve IV V _C2 , and valve VI V _C1 are closed; when the refrigerator 4 is working, the valve II V _G2 , valve IV _C2 , and valve VI V _C1 is open, valve IV _G1 , valve IIIV _H2 and valve VV _H1 are closed.

As a specific implementation, the flue gas waste heat utilization subsystem includes a fuel power conversion device 1 and a waste heat cooling and heating device 2, and the exhaust gas S1 of the fuel power conversion device ₁ is connected to the waste heat cooling and heating device 2 to realize power generation , cooling, heating, fuel power conversion device 1 can choose internal combustion unit for power generation, fuel can choose natural gas, biogas, etc.; waste heat cooling and heating device 2 can choose flue gas hot water type absorption heat pump for recycling The exhaust smoke S1 _of the fuel power conversion device and the waste heat of cylinder jacket water realize cooling and heating.

The waste heat cooling and heating device 2 can be realized by using an existing flue gas hot water type absorption heat pump.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (3)

1. A two-stage absorption soil source heat pump system driven by waste heat of flue gas, characterized in that it comprises: The flue gas waste heat utilization subsystem that provides smoke exhaust; the heat absorption heat pump subsystem that obtains the smoke exhaust of the flue gas waste heat utilization subsystem; the soil source utilization subsystem that communicates with the heat absorption heat pump subsystem for heat exchange; The soil source utilization subsystem includes a shallow geothermal energy heat exchange device (5) for exchanging heat between the geothermal and heat-absorbing heat pump subsystems; The endothermic heat pump subsystem includes a heating machine (3) and a refrigerator (4); The heating machine (3) of the endothermic heat pump subsystem is the first type of heat-increasing absorption heat pump, including generator I ( _GH ), condenser I (CH), evaporator I ( _{E H )} , Absorber Ⅰ (A _H ); the inlet of generator Ⅰ ( _GH ) receives the exhaust smoke from the waste heat utilization subsystem of flue gas, and the exhaust smoke from the outlet of generator Ⅰ ( _GH ) is discharged into the atmosphere; evaporator Ⅰ ( The water inlet of E _H ) is connected to the circulating water outlet of the shallow geothermal energy heat exchange device (5), and the water outlet of the evaporator (E _H ) is connected to the circulating water inlet of the shallow geothermal energy heat exchange device (5); the absorber The water inlet of Ⅰ (A _H ) is connected to the return water of the user's heating circulating water, and the water outlet of the condenser Ⅰ ( _CH ) is connected to the supply water of the user's heating circulating water; The refrigerator (4) of the endothermic heat pump subsystem is an absorption refrigeration device, including generator II (G _C ), condenser II ( _CC ), evaporator II (EC), absorber II ( _{A C} ); the inlet of generator II (G _C ) receives the exhaust smoke from the waste heat utilization subsystem of flue gas, and the exhaust smoke from the outlet of generator II (G _C ) is discharged into the atmosphere; the inlet of evaporator II (E _C ) The water port is connected to the return water of the user's refrigeration circulating water, the water outlet of the evaporator II ( _{EC) is connected to the feed water of the user's refrigeration circulating water, and the water inlet of the absorber II (A H )} is connected to the shallow geothermal energy heat exchange device (5) Circulating water outlet, the outlet of condenser II ( _CH ) is connected to the circulating water inlet of the shallow geothermal energy heat exchange device (5); A valve I (V _G1 ) is set on the pipe connecting the flue gas waste heat utilization subsystem with the inlet of the generator I ( _GH ) of the heating machine (3), and the water outlet of the evaporator I (E _H ) A valve III (V _H2 ) is provided on the pipe communicating with the circulating water inlet of the shallow geothermal energy heat exchange device (5), and the circulating water outlet of the shallow geothermal energy heat exchange device (5) is connected to the evaporator I A valve Ⅴ (V _H1 ) is provided on the pipe connected to the water inlet of (E _H ); A valve II (V _G2 ) is set on the pipe connecting the flue gas waste heat utilization subsystem with the air inlet of the generator II (G _C ) of the refrigerator (4); the water outlet of the condenser II ( _CC ) A valve IV (V _C2 ) is provided on the pipeline between the circulating water inlet of the shallow geothermal energy heat exchange device (5), and the circulating water outlet of the shallow geothermal energy heat exchange device (5) and the absorber A valve Ⅵ (V _C1 ) is set on the pipe connected to the water inlet of Ⅱ (A _C ); When the heating machine (3) is working, valve I (V _G1 ), valve III (V _H2 ), valve V (V _H1 ) are open, valve II (V _G2 ), valve IV (V _C2 ), valve VI (V _C1 )closure; When the refrigerator (4) is working, valve II (V _G2 ), valve IV (V _C2 ), valve VI (V _C1 ) are opened, valve I (V _G1 ), valve III (V _H2 ), valve V (V _H1 )closure. 2. A two-stage absorption soil source heat pump system driven by waste heat of flue gas according to claim 1, characterized in that: The soil source utilization subsystem also includes a U-shaped buried pipe device (6). After the medium in the pipe of the U-shaped buried pipe device (6) enters the shallow geothermal energy heat exchange device (5) for heat exchange, Re-enter the U-shaped buried pipe device (6). 3. A two-stage absorption ground source heat pump system driven by flue gas waste heat according to claim 1, characterized in that: The flue gas waste heat utilization subsystem includes a fuel power conversion device (1) and a waste heat cooling and heating device (2) connected in sequence, the fuel power conversion device (1) is an internal combustion unit; the waste heat cooling and heating device ( 2) It is a flue gas hot water type absorption heat pump.