阅读说明：本技术 耦合溴化锂吸收式制冷的跨临界二氧化碳循环余热发电系统 (Transcritical carbon dioxide circulation waste heat power generation system of coupling lithium bromide absorption refrigeration ) 是由 杨声 袁名旋 刘志强 于 2019-09-03 设计创作，主要内容包括：本发明提供了一种耦合溴化锂吸收式制冷的跨临界二氧化碳循环余热发电系统,包括：发电循环系统,制冷系统和水吸收循环系统,所述发电循环由第一循环泵、蒸发器、透平和冷凝蒸发器组成；所述蒸发器上设置有第一进口、第一出口、第二进口和第二出口,所述冷凝蒸发器上设置有第三进口、第三出口、第四进口和第四出口,所述透平设置有蒸汽进口和乏汽出口；本发明将所述制冷系统和所述水吸收循环系统通过所述冷凝蒸发器与所述发电循环系统耦合在一起,优势互补,通过对余热进行梯级利用,显著降低工业能耗,有助于减少温室气体排放,大大提高了低温余热回收效率和发电效率。(The invention provides a lithium bromide absorption refrigeration coupled transcritical carbon dioxide circulation waste heat power generation system, which comprises: the system comprises a power generation circulating system, a refrigerating system and a water absorption circulating system, wherein the power generation circulating system consists of a first circulating pump, an evaporator, a turbine and a condensation evaporator; the evaporator is provided with a first inlet, a first outlet, a second inlet and a second outlet, the condensing evaporator is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, and the turbine is provided with a steam inlet and a dead steam outlet; the refrigeration system and the water absorption circulation system are coupled with the power generation circulation system through the condensation evaporator, so that the advantages are complementary, the waste heat is utilized in a cascade manner, the industrial energy consumption is obviously reduced, the greenhouse gas emission is reduced, and the low-temperature waste heat recovery efficiency and the power generation efficiency are greatly improved.)

1. A coupling lithium bromide absorption refrigeration trans-critical carbon dioxide circulation waste heat power generation system is characterized by comprising:

The power generation circulating system consists of a first circulating pump, an evaporator, a turbine and a condensation evaporator; the evaporator is provided with a first inlet, a first outlet, a second inlet and a second outlet, the condensing evaporator is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, and the turbine is provided with a steam inlet and a dead steam outlet; an outlet of the first circulating pump is communicated with the first inlet, the first outlet is communicated with the steam inlet, the dead steam outlet is communicated with the third inlet, and the third outlet is communicated with an inlet of the first circulating pump;

The refrigerating system consists of a regenerator, a condenser, an absorber and the condensing evaporator; the regenerator is provided with a fifth inlet, a fifth outlet, a sixth inlet, a sixth outlet and a steam outlet, and the absorber is provided with a steam inlet, a seventh inlet and a seventh outlet; the steam outlet is communicated with the inlet of the condenser, the outlet of the condenser is communicated with the fourth inlet, and the fourth outlet is communicated with the steam inlet;

the water absorption circulating system consists of a heat exchanger, a second circulating pump, the absorber and the regenerator; the heat exchanger is provided with an eighth inlet, an eighth outlet, a ninth inlet and a ninth outlet; the sixth outlet is communicated with the eighth inlet, the eighth outlet is communicated with the seventh inlet, the seventh outlet is communicated with the inlet of the second circulating pump, the outlet of the second circulating pump is communicated with the ninth inlet, and the ninth outlet is communicated with the sixth inlet.

2. the system for generating power by using waste heat of the coupled lithium bromide absorption refrigeration transcritical carbon dioxide cycle as claimed in claim 1, wherein a generator is further arranged on the turbine.

3. The coupled lithium bromide absorption refrigeration trans-critical carbon dioxide cycle waste heat power generation system as claimed in claim 1, wherein the working medium used in the power generation cycle system is carbon dioxide, the refrigerant used in the refrigeration system is water, and the absorbent used in the water absorption cycle system is lithium bromide.

4. The lithium bromide absorption refrigeration coupled transcritical carbon dioxide cycle waste heat power generation system according to claim 1, further comprising a waste heat medium channel, wherein the waste heat medium channel comprises an inflow pipeline and an outflow pipeline, the inflow pipeline is communicated with the second inlet, the second outlet is communicated with the fifth inlet, and the fifth outlet is communicated with the outflow pipeline.

5. The lithium bromide absorption refrigeration coupled transcritical carbon dioxide cycle waste heat power generating system as recited in claim 1 wherein a first throttle valve is disposed between the outlet of said condenser and said fourth inlet.

6. The lithium bromide absorption refrigeration coupled transcritical carbon dioxide cycle waste heat power generating system as recited in claim 1 wherein a second throttle valve is disposed between said eighth outlet and seventh inlet.

Technical Field

The invention relates to power engineering and engineering thermophysical technology, in particular to a lithium bromide absorption refrigeration coupled transcritical carbon dioxide circulation waste heat power generation system.

background

The waste heat is waste energy which is not utilized in energy utilization equipment under certain economic and technical conditions. According to statistics, the total waste heat resources of all industries account for 17% -67% of the total heat energy consumption, and 60% of waste heat can be theoretically recycled. The forms of waste heat resources are different, and the ways of recovering waste heat are also various. Depending on the temperature level, the waste heat includes three types: the low-temperature waste heat (lower than 300 ℃), the medium-temperature waste heat (300-.

Carbon dioxide power generation is a novel power generation technology, when the temperature of carbon dioxide reaches 31.10 ℃ and the pressure reaches 7.38MPa, the carbon dioxide is changed into a supercritical state, and the carbon dioxide has the special physical characteristics of small gas viscosity, high liquid density and the like, so that the carbon dioxide has the typical advantages of good fluidity, high heat transfer efficiency, compressibility and the like, and is suitable for power circulation. Compared with kalina cycle and organic rankine cycle, the transcritical carbon dioxide cycle has great potential in thermodynamic and economic performance. The medium-low temperature waste heat is used as a proper heat source, and the medium-low temperature waste heat recovery power generation can be realized by utilizing the transcritical carbon dioxide circulation.

The absorption refrigeration (heat pump) can utilize cheap energy and low-grade heat energy without relying on a compressor to work to provide power for circulation, and is a common waste heat recovery technology, wherein the absorption refrigeration taking a lithium bromide aqueous solution as a working medium is most widely applied, the lithium bromide absorption refrigeration circulation takes water as a refrigerant and lithium bromide as an absorbent, and can utilize waste heat in the range of more than 80 ℃ to refrigerate and is used for air conditioning or industrial chilled water. The circulation can utilize the medium-low temperature waste heat as the driving heat energy required by the circulation, and the recovery of the medium-low temperature waste heat is realized. The generated chilled water is used as a cold source of the transcritical carbon dioxide circulating power generation system, so that the power generation efficiency of the system is improved, and the cascade utilization of waste heat is realized.

At present, no design can effectively and reasonably combine absorption refrigeration and transcritical carbon dioxide cycle power generation for the field of waste heat recovery.

Disclosure of Invention

The invention provides a lithium bromide absorption refrigeration coupled transcritical carbon dioxide circulation waste heat power generation system, and aims to solve the problem that waste heat utilization is limited by temperature, environment and process and improve waste heat recovery efficiency and power generation efficiency.

in order to achieve the above object, an embodiment of the present invention provides a lithium bromide absorption refrigeration coupled transcritical carbon dioxide cycle waste heat power generation system, including:

the power generation circulating system consists of a first circulating pump, an evaporator, a turbine and a condensation evaporator; the evaporator is provided with a first inlet, a first outlet, a second inlet and a second outlet, the condensing evaporator is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, and the turbine is provided with a steam inlet and a dead steam outlet; an outlet of the first circulating pump is communicated with the first inlet, the first outlet is communicated with the steam inlet, the dead steam outlet is communicated with the third inlet, and the third outlet is communicated with an inlet of the first circulating pump;

The refrigerating system consists of a regenerator, a condenser, an absorber and the condensing evaporator; the regenerator is provided with a fifth inlet, a fifth outlet, a sixth inlet, a sixth outlet and a steam outlet, and the absorber is provided with a steam inlet, a seventh inlet and a seventh outlet; the steam outlet is communicated with the inlet of the condenser, the outlet of the condenser is communicated with the fourth inlet, and the fourth outlet is communicated with the steam inlet;

The water absorption circulating system consists of a heat exchanger, a second circulating pump, the absorber and the regenerator; the heat exchanger is provided with an eighth inlet, an eighth outlet, a ninth inlet and a ninth outlet; the sixth outlet is communicated with the eighth inlet, the eighth outlet is communicated with the seventh inlet, the seventh outlet is communicated with the inlet of the second circulating pump, the outlet of the second circulating pump is communicated with the ninth inlet, and the ninth outlet is communicated with the sixth inlet.

The working medium used in the power generation circulating system is carbon dioxide, the refrigerant used in the refrigerating system is water, and the absorbent used in the water absorption circulating system is lithium bromide.

The waste heat medium channel comprises an inflow pipeline and an outflow pipeline, the inflow pipeline is communicated with the second inlet, the second outlet is communicated with the fifth inlet, and the fifth outlet is communicated with the outflow pipeline.

Wherein a first throttle valve is arranged between the outlet of the condenser and the fourth inlet.

And a second throttling valve is arranged between the eighth outlet and the seventh inlet.

The scheme of the invention has the following beneficial effects:

The lithium bromide absorption refrigeration coupled transcritical carbon dioxide circulation waste heat power generation system combines the refrigeration system taking water as a refrigerant and the water absorption circulation system taking lithium bromide as an absorbent into an absorption refrigeration system, and the refrigeration system and the water absorption circulation system are coupled with the power generation circulation system taking carbon dioxide as a working medium through the condensation evaporator, so that the advantages are complementary; the invention obviously reduces the industrial energy consumption by carrying out cascade utilization on the waste heat, is beneficial to reducing the emission of greenhouse gases and greatly improves the low-temperature waste heat recovery efficiency and the power generation efficiency.

Drawings

FIG. 1 is a schematic diagram of a transcritical carbon dioxide cycle waste heat power generation system with coupled lithium bromide absorption refrigeration of the present invention;

FIG. 2 is a partial schematic view I of a transcritical carbon dioxide cycle waste heat power generation system with coupled lithium bromide absorption refrigeration according to the present invention;

Fig. 3 is a partial schematic view of a coupling lithium bromide absorption refrigeration transcritical carbon dioxide cycle waste heat power generation system of the present invention.

[ description of reference ]

1-a first circulation pump; 2-an evaporator; 3-turbine; 4-a condensation evaporator; 5-a first inlet; 6-a first outlet; 7-a second inlet; 8-a second outlet; 9-a third inlet; 10-a third outlet; 11-a fourth inlet; 12-a fourth outlet; 13-a steam inlet; 14-a dead steam outlet; 15-a regenerator; 16-a condenser; 17-an absorber; 18-a fifth inlet; 19-a fifth outlet; 20-a sixth inlet; 21-a sixth outlet; 22-steam outlet; 23-steam inlet; 24-a seventh inlet; 25-a seventh outlet; 26-a heat exchanger; 27-a second circulation pump; 28-eighth inlet; 29-eighth outlet; 30-a ninth inlet; 31-a ninth outlet; 32-a generator; 33-an inflow conduit; 34-an outflow conduit; 35-a first throttle valve; 36-second throttle valve.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

the invention provides a transcritical carbon dioxide circulation waste heat power generation system coupled with lithium bromide absorption refrigeration, aiming at the problems that the existing waste heat utilization is limited by temperature, environment and process, and the waste heat utilization efficiency and the power generation efficiency are not high.

as shown in fig. 1, 2 and 3, an embodiment of the present invention provides a transcritical carbon dioxide cycle waste heat power generation system coupled with lithium bromide absorption refrigeration, including:

The power generation circulating system consists of a first circulating pump 1, an evaporator 2, a turbine 3 and a condensation evaporator 4; the evaporator 2 is provided with a first inlet 5, a first outlet 6, a second inlet 7 and a second outlet 8, the condensing evaporator 4 is provided with a third inlet 9, a third outlet 10, a fourth inlet 11 and a fourth outlet 12, and the turbine 3 is provided with a steam inlet 13 and a dead steam outlet 14; the outlet of the first circulating pump 1 is communicated with the first inlet 5, the first outlet 6 is communicated with the steam inlet 13, the dead steam outlet 14 is communicated with the third inlet 9, and the third outlet 10 is communicated with the inlet of the first circulating pump 1; a refrigeration system, the refrigeration structure is composed of a regenerator 15, a condenser 16, an absorber 17 and the condensing evaporator 4; the regenerator 15 is provided with a fifth inlet 18, a fifth outlet 19, a sixth inlet 20, a sixth outlet 21 and a steam outlet 22, and the absorber 17 is provided with a steam inlet 23, a seventh inlet 24 and a seventh outlet 25; the steam outlet 22 is communicated with the inlet of the condenser 16, the outlet of the condenser 16 is communicated with the fourth inlet 11, and the fourth outlet 12 is communicated with the steam inlet 23; a water absorption circulation system consisting of a heat exchanger 26, a second circulation pump 27, the absorber 17 and the regenerator 15; the heat exchanger 26 is provided with an eighth inlet 28, an eighth outlet 29, a ninth inlet 30 and a ninth outlet 31; the sixth outlet 21 is communicated with the eighth inlet 28, the eighth outlet 29 is communicated with the seventh inlet 24, the seventh outlet 25 is communicated with the inlet of the second circulating pump 27, the outlet of the second circulating pump 27 is communicated with the ninth inlet 30, and the ninth outlet 31 is communicated with the sixth inlet 20.

The lithium bromide absorption refrigeration coupled transcritical carbon dioxide circulation waste heat power generation system provided by the embodiment of the invention is provided with the power generation circulation system, the refrigeration system and the water absorption circulation system are combined to form absorption refrigeration, and the power generation circulation system, the refrigeration system and the water absorption circulation system are coupled together by the condensation evaporator 4; the working medium in the power generation circulating system starts from an outlet of the first circulating pump 1, enters the evaporator through the first inlet 5, flows out of the first outlet 6 to the steam inlet 13, works in the turbine 3, flows to the third inlet 9 from the dead steam outlet 14, exchanges heat with the refrigerant in the condensing evaporator 4, and then flows to the inlet of the first circulating pump 1 from the third outlet 10 to form circulation; the refrigerant in the refrigeration system flows out from the steam outlet 22 of the regenerator 15, is led to the inlet of the condenser 16, flows from the outlet of the condenser 16 to the fourth inlet 11 after being condensed by the condenser 16, and flows from the fourth outlet 12 to the steam inlet 23 after being subjected to cold heat exchange in the condensing evaporator 4; the absorbent in the water absorption cycle system flows from the sixth outlet 21 to the eighth inlet 28, exchanges heat in the heat exchanger 26, flows from the eighth outlet 29 to the seventh inlet 24, absorbs water in the absorber 17, flows from the seventh outlet 25 to the ninth inlet 30, exchanges heat in the heat exchanger 26, flows from the ninth outlet 31 to the sixth inlet 20, and returns to the regenerator 15.

Wherein, a generator 32 is also arranged on the turbine 3.

The working medium used in the power generation circulating system is carbon dioxide, the refrigerant used in the refrigerating system is water, and the absorbent used in the water absorption circulating system is lithium bromide.

in the above embodiment of the invention, the working medium used in the electric circulation system is carbon dioxide, the refrigerant used in the refrigeration system is water, and the absorbent used in the water absorption circulation system is lithium bromide; the supercritical carbon dioxide carries out heat and cold exchange in the evaporator 2, the formed high-temperature high-pressure supercritical carbon dioxide flows out from the first outlet 6, enters the turbine 3 through the steam inlet 13, and flows out through the exhaust steam outlet 14 for exhaust steam generated after the power generator 32 applies work, the condensation evaporator 4 is cooled, the low-temperature low-pressure carbon dioxide liquid formed by condensation flows out from the third outlet 10, flows into the first circulating pump 1 through the inlet of the first circulating pump 1, the carbon dioxide is compressed to the supercritical state and finally flows into the evaporator 2 through the first inlet 5, and the steps are repeated to generate power circularly, and the first circulating pump 1 provides power for the carbon dioxide to flow circularly; in the regenerator 15, the lithium bromide solution absorbs heat to separate out water vapor, the water vapor flows out from a vapor outlet 22 and is condensed into water in the condenser 16, the water is subjected to heat exchange in the condensation evaporator 4 to form water vapor, the water vapor flows into a vapor inlet 23, and the water vapor is absorbed by a concentrated lithium bromide solution in the absorber 17 to form a dilute lithium bromide solution; in the regenerator 15, after the lithium bromide solution is separated out, a concentrated lithium bromide solution is formed and is led to the heat exchanger 26, the concentrated lithium bromide solution exchanges heat with the dilute lithium bromide in the heat exchanger 26, and then is led to the absorber 17, the concentrated lithium bromide solution absorbs steam to become the dilute lithium bromide solution, the dilute lithium bromide solution absorbs heat in the heat exchanger 26 to form a circulating base solution with a proper temperature, the circulating base solution enters the regenerator 15, the steps are repeated, the circulating absorption is performed, and the second circulating pump 27 provides power for the circulating flow of the lithium bromide solution.

The waste heat medium channel comprises an inflow pipeline 33 and an outflow pipeline 34, the inflow pipeline 33 is communicated with the second inlet 7, the second outlet 8 is communicated with the fifth inlet 18, and the fifth outlet 19 is communicated with the outflow pipeline 34.

In the transcritical carbon dioxide circulation waste heat power generation system adopting coupling lithium bromide absorption refrigeration according to the embodiment of the invention, the waste heat medium flows into the pipeline 33 from the inlet, enters the evaporator 2 through the second inlet 7, so that the carbon dioxide in the evaporator 2 absorbs heat to form high-temperature high-pressure supercritical carbon dioxide, the temperature of the waste heat medium is reduced to form medium and low temperature waste heat medium, the medium and low temperature waste heat medium flows out from the second outlet 8, flows into the regenerator 15 through the fifth inlet 18, so that steam separated from the dilute lithium bromide solution in the regenerator 15 is reformed into the concentrated lithium bromide solution, the steam flows out from the steam outlet 22, and then the medium and low temperature waste heat medium enters the outflow pipeline 34 through the fifth outlet 19.

Wherein a first throttle valve 35 is arranged between the outlet of the condenser 16 and the fourth inlet 11.

Wherein a second throttle 36 is arranged between the eighth outlet 29 and the seventh inlet 24.

In the above-described embodiment of the present invention, the first throttle valve 35 is configured to regulate the flow rate and the water pressure of the condensed water entering the fourth inlet 11 from the outlet of the condenser 16, and the second throttle valve 35 is configured to regulate the flow rate and the speed of the concentrated lithium bromide entering the seventh inlet 24 from the eighth outlet 29.

The lithium bromide absorption refrigeration coupling transcritical carbon dioxide circulation waste heat power generation system provided by the embodiment of the invention is provided with a power generation circulation system, a refrigeration system and a water absorption circulation system, wherein the refrigeration system takes water as a coolant, the water absorption circulation system takes lithium bromide as an absorbent, the power generation circulation system takes carbon dioxide as a working medium, the refrigeration system and the water absorption circulation system are combined into an absorption refrigeration system, and the refrigeration system and the water absorption circulation system are coupled with the power generation circulation system through the condensation evaporator, so that the advantages are complementary, the waste heat is utilized in a stepped manner, the industrial energy consumption is obviously reduced, the greenhouse gas emission is favorably reduced, and the low-temperature waste heat recovery efficiency and the power generation efficiency are greatly improved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.