CN113357660B - Cooling and heating system based on plume elimination and waste heat recovery of gas boiler flue gas - Google Patents

Abstract

The invention discloses a refrigerating and heating system based on plume elimination and waste heat recovery of gas boiler flue gas, comprising a lithium bromide absorption refrigeration device and a heat pump device, and the refrigeration device includes an evaporator, an absorber, a generator, a condenser and a vacuum pump The evaporator includes an evaporator chamber and a first heat exchanger, the vacuuming device is connected to the evaporator chamber, the absorber includes an absorber chamber and a second heat exchanger, and the generator includes a generator chamber and a third heat exchanger Heat exchanger, the third heat exchanger is boiler waste heat flue gas, the condenser includes a condenser chamber, the fourth heat exchanger, the heat pump device includes a heat pump evaporator, a compressor and a heat pump condenser, and the heat pump evaporator includes a heat pump evaporator The chamber and the fifth heat exchanger, the third heat exchanger communicates with the heat pump evaporator chamber, and the heat pump condenser includes the heat pump condenser chamber and the sixth heat exchanger. The invention utilizes the latent heat of the boiler waste heat flue gas to realize the combined cooling and heating supply and can eliminate the white plume emitted by the flue gas.

Description

A refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas

technical field

The invention relates to a method for deep utilization of waste heat of gas boiler flue gas, in particular to a refrigeration and heating system based on gas boiler flue gas elimination and waste heat recovery.

Background technique

When gas boilers produce steam or hot water and heat or dry materials, the utilization of waste heat from flue gas is essential. At present, the economizer, commonly known as the economizer, which uses the waste heat of flue gas to preheat the boiler's supplementary water and waste heat combustion air, is the mainstream product, but the remaining heat is not fully utilized, especially the gas flue gas contains a large amount of water vapor. The heat that the air can absorb cannot reduce the water vapor in the flue gas below the dew point temperature, but only recovers part of the sensible heat of the flue gas at a higher temperature, while the latent heat of the water vapor in the flue gas has not been deeply recycled. cause a huge waste of energy.

Gas boiler flue gas contains a lot of water vapor. When the exhaust gas temperature is high, the water vapor in the flue gas does not drop below the dew point temperature. The direct low-altitude discharge of flue gas containing high water vapor partial pressure will produce white plumes around the chimney. , this kind of white plume is easy to form aerosol, which is another incentive to cause smog. The elimination of white plume in flue gas is a mandatory indicator for future environmental protection emission requirements. For the treatment of large-scale industrial flue gas with concentrated emissions, it is an urgent problem to seek a novel, energy-saving and profitable flue gas treatment process for eliminating white plume.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a method that makes full use of the latent heat with high water content in the waste heat of the gas and simultaneously obtains the cooling capacity and heat to achieve the waste heat utilization of the flue gas to obtain combined cooling and heating, and can eliminate the heat at the same time. An economical method for the white plume phenomenon emitted by the gas boiler flue gas, and a refrigeration and heating system based on the waste heat recovery of the gas boiler flue gas to eliminate the white smoke phenomenon is developed.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A refrigeration and heating system based on plume elimination and waste heat recovery of gas boiler flue gas, comprising a lithium bromide absorption refrigeration device and a heat pump device, and the lithium bromide absorption refrigeration device includes an evaporator, an absorber, a generator, a condenser and a pump. A vacuum device, the evaporator includes an evaporator chamber and a first heat exchanger arranged in the evaporator chamber, the medium in the evaporator chamber is refrigerant water, and the vacuum pumping device is connected to the evaporator chamber , the absorber includes an absorber chamber and a second heat exchanger arranged in the absorber chamber, the medium in the absorber chamber is a lithium bromide solution, and the evaporator chamber is connected with the first refrigerant water vapor channel through the first refrigerant water vapor channel. The absorber chamber is connected, the generator includes a generator chamber and a third heat exchanger arranged in the generator chamber, the medium in the generator chamber is a lithium bromide solution, and the The medium is boiler waste heat flue gas, the generator chamber is connected to the absorber chamber through pipelines, the condenser includes a condenser chamber and a fourth heat exchanger arranged in the condenser chamber, the condenser The medium in the chamber is refrigerant water, the generator chamber communicates with the condenser chamber through the second refrigerant water vapor channel, the condenser chamber communicates with the evaporator chamber through the refrigerant water channel, and the The heat pump device includes a heat pump evaporator, a compressor and a heat pump condenser, the heat pump evaporator includes a heat pump evaporator chamber and a fifth heat exchanger arranged in the heat pump evaporator chamber, and the outlet of the third heat exchanger passes through The primary cooling flue gas pipeline is communicated with the heat pump evaporator chamber, the medium in the fifth heat exchanger is low-pressure refrigerant, the heat pump evaporator chamber is provided with a smoke exhaust port, and the heat pump condenser includes a heat pump condenser The chamber and the sixth heat exchanger arranged in the heat pump condenser chamber, the outlet of the fifth heat exchanger is connected with the compressor, the compressor is connected with the heat pump condenser chamber, and the heat pump condenser chamber is connected with the fifth heat exchanger The inlet of the heat exchanger is connected.

As a further improvement of the above technical solution, the lithium bromide absorption refrigeration device further includes a solution heat exchanger, and the solution heat exchanger includes a working concentration lithium bromide solution path and a concentrated hot lithium bromide shell path, and the working concentration cold lithium bromide The inlet of the solution on the tube side is connected with the absorber chamber, the outlet is connected with the generator chamber, the concentrated hot lithium bromide dilute cold solution is connected with the generator chamber on the shell side, and the outlet is connected with the absorber chamber.

As a further improvement of the above technical solution, the first heat exchanger performs heat-to-cold exchange, and the medium therein is chilled water.

As a further improvement of the above technical solution, the second heat exchanger performs cold-to-heat exchange, and circulating cooling water is introduced into it; the fourth heat exchanger is used for cold-to-heat exchange, and the The first is circulating cooling water; the sixth heat exchanger performs the exchange of cold and heat, and the preparation water is introduced into it.

As a further improvement of the above technical solution, the refrigeration and heating system includes a low-pressure box body and a high-pressure box body, and the low-pressure box body is horizontally divided into two low-pressure sub-box bodies by a first partition plate, wherein one low-pressure sub-box body constitutes The evaporator chamber, another low-pressure sub-box body constitutes the absorber chamber, the space reserved between the first baffle and the top of the low-pressure box constitutes the low-temperature refrigerant water vapor channel, and the high-pressure box passes through the first partition. The two partitions are horizontally divided into two high-pressure sub-boxes, one of which constitutes the generator chamber, and the other high-pressure sub-box constitutes the condenser chamber. The second partition is connected to the top of the high-pressure box. The reserved gap between them constitutes a high-temperature refrigerant water vapor channel.

As a further improvement of the above technical solution, the top of the first partition is provided with a defoaming stuffing box for removing refrigerant water vapor, and the top of the second partition is also provided with a defoaming stuffing box. The foam stuffing box is filled with ceramic corrugated packing, ceramic Haier ring and Raschig ring.

As a further improvement of the above technical solution, an absorber circulating pump is connected to the absorber chamber, and the absorber circulating pump is divided into two branches, one branch is connected to the working concentration lithium bromide solution through the inlet of the pipe side, and the other branch The road is connected to a first spray device arranged in the absorber chamber, and the first spray device is located above the second heat exchanger.

As a further improvement of the above technical solution, the generator chamber is provided with a second spray device, the second spray device is connected to the outlet of the working concentration lithium bromide solution through the pipe side, and the second spray device is located in the third Above the heat exchanger, the generator chamber is connected to the shell-side inlet of the concentrated hot lithium bromide solution through the generator circulating pump.

As a further improvement of the above technical solution, a condenser circulating pump is provided on the refrigerant water channel.

As a further improvement of the above technical solution, the third heat exchanger includes a heat transfer tube with fins; the fifth heat exchanger includes a copper tube with fins.

Compared with the prior art, the advantages of the present invention are:

The refrigeration and heating system based on the waste heat recovery of the gas boiler flue gas of the present invention is the deep utilization of the waste heat of the flue gas. The latent heat with high water content in the flue gas can obtain both cooling and heat at the same time, so that the waste heat of the flue gas can be utilized to obtain combined cooling and heating, and the medium and low temperature waste heat in the flue gas of the gas boiler can be fully utilized in stages to produce cooling and heat to meet production and life requirements. In the occasions where there is a demand for cold and heat at the same time, and the output characteristic of the waste heat flue gas is dry flue gas with low humidity, white smoke will not be produced after being discharged at low altitude. The system is easy to connect to the boiler system and has high reliability, which can maximize the energy saving of the combined cooling and heating, and the operation of the environmental protection treatment device is economical and beneficial.

Description of drawings

Fig. 1 is the working principle diagram of the system of the present invention.

Figure 2 is a schematic perspective view of the lithium bromide absorption refrigeration device of the present invention.

3 is a schematic cross-sectional view of the lithium bromide absorption refrigeration device of the present invention.

Figure 4 is a schematic longitudinal cross-sectional view of the lithium bromide absorption refrigeration device of the present invention.

Fig. 5 is a front view of the heat pump device in the present invention.

Fig. 6 is a left side view of the heat pump device in the present invention.

The symbols in the figure represent:

100, lithium bromide absorption refrigeration device; 101, low temperature refrigerant water vapor passage; 102, high temperature refrigerant water vapor passage; 103, refrigerant water passage; 110, evaporator; 111, evaporator chamber; 112, first change Heater; 120, absorber; 121, absorber chamber; 122, second heat exchanger; 130, generator; 131, generator chamber; 132, third heat exchanger; 140, condenser; 141, Condenser chamber; 142, the fourth heat exchanger; 150, solution heat exchanger; 151, the working concentration lithium bromide solution goes on the tube side; 152, the concentrated hot lithium bromide solution goes on the shell side; 160, the vacuum pumping device; 161, the vacuum pump; 162, buffer tank; 163, gas-liquid separator; 200, heat pump device; 201, heat pump flue gas inlet; 202, low pressure refrigerant inlet; 203, low pressure refrigerant outlet; 204, preparation water inlet; 205, preparation water outlet 205 ; 210, heat pump evaporator; 211, heat pump evaporator chamber; 212, fifth heat exchanger; 213, smoke outlet; 214, exhaust fan; 220, compressor; 230, heat pump condenser; 231, heat pump condenser Chamber; 232, sixth heat exchanger; 3, primary cooling flue gas pipeline; 4, boiler; 41, waste heat flue gas pipeline; 5, low pressure box; 51, first partition; 6, high pressure box ; 61, the second partition; 62, the gas inlet head; 63, the gas outlet head; 7, the defoaming stuffing box; 81, the absorber circulating pump; 82, the generator circulating pump; 83, the condenser Circulating pump; 91. First spraying device; 92. Second spraying device.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 to FIG. 6 , the cooling and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas in this embodiment includes a lithium bromide absorption refrigeration device 100 and a heat pump device 200 . The lithium bromide absorption refrigeration device 100 includes an evaporator 110, an absorber 120, a generator 130, a condenser 140, and a vacuum device 160. The evaporator 110 includes an evaporator chamber 111 and a first exchanger disposed in the evaporator chamber 111. Heater 112, the medium in the evaporator chamber 111 is refrigerant water, the vacuum device 160 is connected to the evaporator chamber 111, and the absorber 120 includes the absorber chamber 121 and the second absorber chamber 121. The heat exchanger 122, the medium in the absorber chamber 121 is lithium bromide solution, the evaporator chamber 111 is communicated with the absorber chamber 121 through the low-temperature refrigerant water vapor channel 101, and the generator 130 includes a generator chamber 131 and a generator chamber 131. The third heat exchanger 132 in the generator chamber 131, the medium in the generator chamber 131 is lithium bromide solution, the medium in the third heat exchanger 132 is boiler waste heat flue gas, and the inlet of the third heat exchanger 132 passes the waste heat The flue gas pipeline 41 is connected to the boiler 4 , the generator chamber 131 is connected to the absorber chamber 121 through a pipeline, and the condenser 140 includes a condenser chamber 141 and a fourth heat exchanger arranged in the condenser chamber 141 142, the medium in the condenser chamber 141 is refrigerant water, the generator chamber 131 communicates with the condenser chamber 141 through the high temperature refrigerant water vapor channel 102, and the condenser chamber 141 communicates with the evaporator through the refrigerant water channel 103 The chamber 111 communicates.

The heat pump device 200 includes a heat pump evaporator 210, a compressor 220 and a heat pump condenser 230. The heat pump evaporator 210 includes a heat pump evaporator chamber 211 and a fifth heat exchanger 212 arranged in the heat pump evaporator chamber 211. The third heat exchanger The outlet of the heat exchanger 132 is communicated with the heat pump evaporator chamber 211 through the primary cooling flue gas pipeline 3, the medium in the fifth heat exchanger 212 is low pressure refrigerant, the heat pump evaporator chamber 211 is provided with a smoke exhaust port 213, and the heat pump condenses The heat pump 230 includes a heat pump condenser chamber 231 and a sixth heat exchanger 232 arranged in the heat pump condenser chamber 231. The outlet of the fifth heat exchanger 212 is connected to the compressor 220, and the compressor 220 is connected to the heat pump condenser chamber 231. Connected, the heat pump condenser chamber 231 is connected to the inlet of the fifth heat exchanger 212 .

Among them, preferably, the first heat exchanger 112 performs heat-to-cold exchange, the medium therein is chilled water, the chilled water is connected to the user's refrigerator or other places that require cooling, and after cooling, the water flows into the first heat exchange again. device 112. The second heat exchanger 122 performs cold-to-heat exchange, and the circulating cooling water is introduced into it, and the circulating cooling water is an external water source; the fourth heat exchanger 142 is used for cold-to-heat exchange, and the circulating cooling water is introduced into it. Circulating cooling water, which is also an external water source. The sixth heat exchanger 232 performs cold-to-heat exchange, into which the prepared water is passed, and after being heated, hot water is prepared, and then connected to the user's heater or other places where hot water is needed. It should be noted that, in addition to this embodiment, the second heat exchanger 122 may also pass other cooling liquids, the fourth heat exchanger 142 may pass other cooling liquids, and the sixth heat exchanger 232 may also be Other preparation liquids.

when working:

Referring to FIG. 1 , the vacuuming device 160 evacuates the evaporator chamber 111 to ensure that the pressure of the evaporator chamber 111 and the absorber chamber 121 (the low-temperature refrigerant water vapor channel 101 connects the two) is 0.78kpa, and the evaporator The refrigerant water in the chamber 111 evaporates rapidly at a lower surface pressure, and the temperature of the refrigerant water in the chamber decreases, cooling the circulating refrigeration water in the first heat exchanger 112, and the circulating refrigeration water is connected to the user's Refrigerator or other places that need to be cooled to achieve cooling. The evaporated refrigerant water vapor enters the absorber chamber 121 through the low-temperature refrigerant water vapor channel 101. The lithium bromide solution with high concentration in the absorber chamber 121 has strong water absorption. After water absorption, the lithium bromide solution becomes diluted into a working concentration lithium bromide solution. , Since lithium bromide water absorption is an exothermic reaction, in order to ensure the absorption effect, circulating cooling water is introduced into the second heat exchanger 122 to ensure that the temperature in the absorber chamber 121 is below 40°C. The absorbed working concentration lithium bromide solution enters the generator chamber 131 through the pipeline, and heat exchange occurs through the waste heat flue gas in the third heat exchanger 132. After the working concentration lithium bromide solution is heated to evaporate water, the lithium bromide solution becomes thicker and evaporated. The refrigerant water vapor enters the condenser chamber 141 from the high temperature refrigerant water vapor channel 102, and the circulating cooling water is passed into the fourth heat exchanger 142 therein, and the refrigerant water vapor generates heat exchange with the circulating cooling water and condenses. The refrigerant water is converted into refrigerant water, and the refrigerant water enters the evaporator chamber 111 through the refrigerant water channel 103 for recycling.

After the waste heat flue gas in the third heat exchanger 132 is cooled once, it enters the chamber of the heat pump evaporator 210 through the primary cooling flue gas pipeline 3, and exchanges heat with the low-pressure refrigerant in the fifth heat exchanger 212. After the secondary cooling of the gas, it is discharged through the exhaust port 213, and the low-pressure refrigerant and the waste heat flue gas are exchanged into refrigerant vapor, and the refrigerant vapor is pressurized and heated by the compressor 220 to become high-temperature and high-pressure steam, and the high-temperature and high-pressure steam enters the heat pump for condensation. The heat pump chamber 231 exchanges heat with the prepared water in the sixth heat exchanger 232, and the prepared water is heated to become hot water, which is connected to the user's heater or other places where hot water is needed. After the refrigerant vapor is cooled and liquefied, it enters the fifth heat exchanger 212 again for recycling.

It should be noted that the concentration range of the working concentration lithium bromide solution is a low value range of 55% to 65%, and the concentration range of the concentrated lithium bromide solution is a high value range of 55% to 65%. The temperature of the boiler waste heat flue gas entering the inlet of the third heat exchanger 132 is not lower than 70°C, and the temperature of the flue gas at the outlet of the third heat exchanger 132 is not lower than 60°C. The temperature of the flue gas discharged by the secondary cooling in the heat pump evaporator 210 can be lower than 20°C. After the secondary cooling of the waste heat flue gas, the water vapor in it is condensed into water, and the residual heat flue gas becomes low-temperature dry flue gas. The smoke port 213 is discharged to eliminate the white plume emitted by the flue gas of the gas boiler, and the phenomenon of white smoke will not be produced. The upper limit of the temperature of the hot water prepared by the heat pump device 200 can reach 80°C.

The invention is for the deep utilization of the waste heat of the flue gas, aiming at the relatively low temperature waste heat flue gas after treatment, not the high temperature flue gas directly discharged from the boiler, making full use of the latent heat of the high water content in the waste heat flue gas of the gas, and obtaining the cooling capacity and the heat at the same time. , to achieve the utilization of flue gas waste heat to obtain combined cooling and heating, and to make full use of the medium and low temperature waste heat in the gas boiler flue gas to produce cooling and heat, so as to meet the needs of both production and life, and the output characteristics of waste heat flue gas It is dry flue gas with low humidity and will not produce white smoke after being discharged at low altitude. The system is easy to connect to the boiler system and has high reliability, which can maximize the energy saving of the combined cooling and heating, and the operation of the environmental protection treatment device is economical and beneficial.

In this embodiment, the lithium bromide absorption refrigeration device 100 further includes a solution heat exchanger 150, and the solution heat exchanger 150 includes a working concentration lithium bromide solution passing tube 151 and a concentrated hot lithium bromide solution shell passing 152, and the working concentration lithium bromide solution passing a tube pass The inlet of 151 is connected to the absorber chamber 121 , the outlet is connected to the generator chamber 131 , the concentrated hot lithium bromide solution goes through the shell side 152 The inlet is connected to the generator chamber 131 , and the outlet is connected to the absorber chamber 121 .

Specifically, the absorber chamber 121 is connected to an absorber circulating pump 81, and the absorber circulating pump 81 is divided into two branches, one branch is connected to the inlet of the working concentration lithium bromide solution through the pipe path 151, and the other branch is connected to the absorption The first spray device 91 in the heat exchanger chamber 121 is connected, and the first spray device 91 is located above the second heat exchanger 122 . The generator chamber 131 is provided with a second spray device 92, the second spray device 92 is connected to the outlet of the working concentration lithium bromide solution through the pipe pass 151, the second spray device 92 is located above the third heat exchanger 132, the generator The chamber 131 is connected with the inlet of the concentrated hot lithium bromide solution through the shell side 152 through the generator circulating pump 82 .

The lithium bromide solution in the absorber chamber 121 becomes a working concentration lithium bromide solution after being diluted, and passes through the solution heat exchanger 150 for heat exchange before entering the generator chamber 131 . The working concentration lithium bromide solution in the absorber chamber 121 is sucked out by the absorber circulating pump 81 and divided into two paths, and one path is returned to the first spray device 91 in the absorber chamber 121, and is atomized by the nozzle of the first spray device 91 Then absorb the refrigerant water vapor and dilute it into a dilute lithium bromide solution. The other way is to enter the working concentration lithium bromide solution through the tube process 151, and the concentrated hot lithium bromide solution enters through the shell process 152 is the concentrated hot lithium bromide solution from the generator chamber 131 from dilute to thick, and the working concentration lithium bromide solution and the concentrated hot lithium bromide solution are generated. During heat exchange, the working concentration lithium bromide solution becomes heated and enters the generator chamber 131, and continues to be heated to become thicker.

The lithium bromide solution that enters the generator chamber 131 is heated and becomes concentrated and enters the second spray device 92, and is atomized by the nozzle of the second spray device 92 and then volatilizes the refrigerant water vapor to become a concentrated lithium bromide solution.

By arranging the solution heat exchanger 150, the process of diluting and concentrating the lithium bromide solution is accelerated, and energy is saved.

In this embodiment, the cooling and heating system includes a low-pressure box 5 and a high-pressure box 6. The low-pressure box 5 is horizontally divided into two low-pressure sub-boxes by the first partition plate 51, and one of the low-pressure sub-boxes constitutes an evaporator cavity Chamber 111, another low-pressure sub-box constitutes the absorber chamber 121, the space reserved between the first partition 51 and the top of the low-pressure box 5 constitutes the low-temperature refrigerant water vapor channel 101, and the high-pressure box 6 passes through the second The partition 61 is horizontally divided into two high-pressure sub-boxes, one of which constitutes the generator chamber 131 , the other high-pressure sub-box constitutes the condenser chamber 141 , and the second partition 61 and the high-pressure box 6 are connected. The space reserved between the tops constitutes the high-temperature refrigerant water vapor channel 102 .

Among them, the top of the first partition 51 is provided with a defoaming stuffing box 7 for removing refrigerant water vapor mist, and the top of the second partition 61 is also provided with a defoaming stuffing box 7, and the defoaming stuffing box 7 is filled with ceramics Corrugated packing, ceramic Haier and Raschig rings.

In this embodiment, the refrigerant water channel 103 is provided with a condenser circulating pump 83 . That is, the refrigerant water in the condenser chamber 141 is pumped into the evaporator chamber 111 by the condenser circulating pump 83 .

In this embodiment, the first heat exchanger 112 in the evaporator 110 is a immersed coil heat exchanger, which is characterized by using stainless steel or copper or titanium tubes to be wound into a circular disc or a spiral with a circular arc rectangular disc The spiral disk layers are fixed with angle steel or flat steel, the whole group is fixed at the bottom of the low-pressure box 5, and the inlet and outlet pipes are led out from the left side plate of the low-pressure box 5.

In this embodiment, the second heat exchanger 122 of the absorber 120 adopts a submerged coil heat exchanger, which is characterized by using stainless steel or copper tubes or titanium tubes to be wound into a spiral shape of a circular disc or a rectangular disc with a circular arc. The spiral disk layers are fixed with angle steel or flat steel, and the whole group is fixed at the bottom of the low-pressure box 5. The inlet and outlet pipes are led out from the right side plate of the low-pressure box 5 and connected to the external circulating cooling water.

In this embodiment, the first spray device 91 adopts a silicon carbide centrifugal nozzle, which is characterized by atomizing the lithium bromide solution into droplets of about 45 microns, increasing the contact area between the lithium bromide solution and the refrigerant vapor evaporated by the evaporator 110, and increasing the absorption efficiency.

In this embodiment, the third heat exchanger 132 in the generator 130 adopts a falling film heat exchanger, including a heat transfer tube with fins, and the fins can increase the heat exchange area and efficiency. There are a flue gas inlet head 62 and a flue gas outlet head 63 . The waste heat flue gas enters from the flue gas inlet head 62 into contact with the finned heat transfer tube for heat exchange, and then exits from the flue gas outlet head 63 and enters the heat pump device 200 through the primary cooling flue gas pipeline 3 . The dilute lithium bromide solution in the absorber 120 is pumped by the absorber circulating pump 81 to the second spray device 92 in the generator 130, and sprayed evenly on the surface of the heat transfer tube with fins to realize the separation of the lithium bromide solution from the water.

In this embodiment, the fourth heat exchanger 142 in the condenser 140 is an immersed coil heat exchanger, which is characterized by using stainless steel or copper tubes or titanium tubes to be wound into a circular disc or a spiral shape with a circular arc rectangular disc. , the spiral disk layer and the layer are fixed with angle steel or flat steel, the whole group is fixed at the bottom of the high-pressure box 6, and the inlet and outlet pipes are led out from the side or top of the high-pressure box 6.

In this embodiment, the solution heat exchanger 150 adopts a shell-and-tube heat exchanger to realize heat exchange between cold and hot fluids and achieve the purpose of energy saving. The generator circulating pump 82, the absorber circulating pump 81, and the condenser circulating pump 83 are centrifugal chemical pumps.

In the present embodiment, the vacuum pumping device 160 includes a vacuum pump 161, a buffer tank 162, a gas-liquid separator 163 and a connecting pipeline. When it is detected that the pressure in the evaporator 110 is lower than the set temperature, the vacuum pump 161 automatically starts pumping to make evaporation The device 110 reaches a specified degree of vacuum.

In this embodiment, the heat pump device 200 is a direct expansion heat pump device. One end of the heat pump evaporator chamber 211 is provided with a heat pump flue gas inlet 201 , and an exhaust fan 214 is provided at the exhaust port 213 . The primary cooling flue gas pipeline 3 is connected to the heat pump flue gas inlet 201 . Both ends of the heat pump evaporator chamber 211 are further provided with a low pressure refrigerant inlet 202 and a low pressure refrigerant outlet 203 , and the low pressure refrigerant inlet 202 and the low pressure refrigerant outlet 203 are connected to the fifth heat exchanger 212 . The low pressure refrigerant outlet 203 is at the same end as the heat pump flue gas inlet 201 and the low pressure refrigerant inlet 202 is at the opposite end. The fifth heat exchanger 212 includes finned copper tubes. The flue gas enters the heat pump evaporator chamber 211 to exchange heat with the finned copper tube, and heat up and vaporize the low-pressure refrigerant.

The low pressure refrigerant outlet 203 is connected to the compressor 220 through the pipeline, and the compressor 220 is connected to the heat pump condenser chamber 231 through the pipeline. The heat pump condenser chamber 231 is provided with a preparation water inlet 204 and a preparation water outlet 205 , and the preparation water inlet 204 and the preparation water outlet 205 are connected to the sixth heat exchanger 232 . The compressor 220 adopts a screw compressor or a centrifugal compressor or a piston compressor assembly. The compressor 220 compresses the low pressure refrigerant vapor vaporized from the heat pump evaporator chamber 211 into a high temperature and high pressure gas. The high-temperature and high-pressure steam from the compressor 220 enters the heat pump condenser chamber 231, and the prepared water in the sixth heat exchanger 232 obtains the heat of the high-temperature and high-pressure refrigerant to be heated to the desired temperature. Preferably, the low-pressure refrigerant is R134a or R407 environmentally friendly refrigerant.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent implementation of equivalent changes. example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention should fall within the protection scope of the technical solutions of the present invention.

Claims (10)

1. a refrigeration and heating system based on plume elimination and waste heat recovery of gas boiler flue gas, is characterized in that: comprise lithium bromide absorption refrigeration device (100) and heat pump device (200), described lithium bromide absorption refrigeration device (100) ) includes an evaporator (110), an absorber (120), a generator (130), a condenser (140) and a vacuum device (160), the evaporator (110) includes an evaporator chamber (111) and a device The first heat exchanger (112) in the evaporator chamber (111), the medium in the evaporator chamber (111) is refrigerant water, and the vacuum device (160) is connected to the evaporator chamber (111). 111) connection, the absorber (120) includes an absorber chamber (121) and a second heat exchanger (122) provided in the absorber chamber (121), and the absorber chamber (121) The medium is a lithium bromide solution, the evaporator chamber (111) is communicated with the absorber chamber (121) through a low-temperature refrigerant water vapor channel (101), and the generator (130) includes a generator chamber (131) and A third heat exchanger (132) arranged in the generator chamber (131), the medium in the generator chamber (131) is a lithium bromide solution, and the medium in the third heat exchanger (132) is Boiler waste heat flue gas, the generator chamber (131) is connected to the absorber chamber (121) through pipelines, and the condenser (140) includes a condenser chamber (141) and a condenser chamber (141) provided in the condenser chamber ( 141) in the fourth heat exchanger (142), the medium in the condenser chamber (141) is refrigerant water, and the generator chamber (131) communicates with the high temperature refrigerant water vapor channel (102) through the high temperature refrigerant water vapor channel (102). A condenser chamber (141) is communicated, the condenser chamber (141) is communicated with the evaporator chamber (111) through a refrigerant water channel (103), and the heat pump device (200) includes a heat pump evaporator (210) , a compressor (220) and a heat pump condenser (230), the heat pump evaporator (210) includes a heat pump evaporator chamber (211) and a fifth heat exchanger ( 212), the outlet of the third heat exchanger (132) is communicated with the heat pump evaporator chamber (211) through the primary cooling flue gas pipeline (3), and the medium in the fifth heat exchanger (212) is low pressure For refrigerant, the heat pump evaporator chamber (211) is provided with a smoke exhaust port (213), and the heat pump condenser (230) includes a heat pump condenser chamber (231) and a heat pump condenser chamber (231) The sixth heat exchanger (232) inside, the outlet of the fifth heat exchanger (212) is connected to the compressor (220), the compressor (220) is connected to the heat pump condenser chamber (231), the The heat pump condenser chamber (231) is connected to the inlet of the fifth heat exchanger (212). 2. The refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas according to claim 1, characterized in that: the lithium bromide absorption refrigeration device (100) further comprises a solution heat exchanger (150), The solution heat exchanger (150) includes a working concentration lithium bromide solution passing through a tube pass (151) and a concentrated hot lithium bromide solution passing through a shell pass (152), the working concentration lithium bromide solution passing through the inlet of the tube pass (151) and the absorber cavity The chamber (121) is connected, the outlet is connected with the generator chamber (131), the inlet of the concentrated hot lithium bromide solution is connected with the generator chamber (131) through the shell side (152), and the outlet is connected with the absorber chamber (121) . 3. The refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas according to claim 1, characterized in that: the first heat exchanger (112) performs heat-to-cooling exchange, and the The medium is chilled water. 4. The refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas according to claim 1, wherein the second heat exchanger (122) performs cold-to-heat exchange, and its internal communication The incoming is circulating cooling water; the fourth heat exchanger (142) performs cold-to-heat exchange, and the circulating cooling water is introduced into it; the sixth heat exchanger (232) performs cold-to-heat exchange , which is fed with water for preparation. 5. The cooling and heating system based on the plume reduction and waste heat recovery of gas boiler flue gas according to any one of claims 1 to 4, characterized in that: the cooling and heating system comprises a low-pressure box (5) and a high-pressure The box body (6), the low pressure box body (5) is horizontally divided into two low pressure sub-box bodies by the first partition plate (51), one of the low pressure sub-box bodies constitutes the evaporator chamber (111), the other low pressure sub-box body The sub-box body constitutes an absorber chamber (121), the space reserved between the first partition plate (51) and the top of the low-pressure box body (5) constitutes a low-temperature refrigerant water vapor channel (101), and the high-pressure The box (6) is horizontally divided into two high-pressure sub-boxes by the second partition plate (61), wherein one high-pressure sub-box constitutes a generator chamber (131), and the other high-pressure sub-box constitutes a condenser chamber (131). 141), the gap reserved between the second partition plate (61) and the top of the high-pressure tank (6) constitutes a high-temperature refrigerant water vapor channel (102). 6. The cooling and heating system based on the plume reduction and waste heat recovery of gas boiler flue gas according to claim 5, characterized in that: the top of the first partition plate (51) is provided with a water vapor mist removal device on top of the first partition plate (51). The defoaming stuffing box (7), the top of the second partition (61) is also provided with a defoaming stuffing box (7), the defoaming stuffing box (7) is filled with ceramic corrugated packing, ceramic Haier ring and Raschig Ring. 7. The refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas according to claim 2, characterized in that: the absorber chamber (121) is connected to an absorber circulating pump (81), so The absorber circulating pump (81) is divided into two branches, one branch is connected to the inlet of the working concentration lithium bromide solution through the tube side (151), and the other branch is connected to the first sprayer arranged in the absorber chamber (121). A shower device (91) is connected, and the first shower device (91) is located above the second heat exchanger (122). 8. The cooling and heating system based on plume reduction and waste heat recovery of gas boiler flue gas according to claim 7, characterized in that: a second spray device (92) is provided in the generator chamber (131) , the second spraying device (92) is connected to the outlet of the working concentration lithium bromide solution through the tube side (151), the second spraying device (92) is located above the third heat exchanger (132), and the generator The chamber (131) is connected with the inlet of the concentrated hot lithium bromide solution on the shell side (152) through the generator circulation pump (82). 9. The refrigeration and heating system based on the plume elimination and waste heat recovery of gas boiler flue gas according to any one of claims 1 to 4, characterized in that: the refrigerant water channel (103) is provided with a condenser circulation pump (83). 10. The refrigeration and heating system based on the plume reduction and waste heat recovery of gas boiler flue gas according to any one of claims 1 to 4, wherein the third heat exchanger (132) comprises a finned heat exchanger. A heat transfer tube; the fifth heat exchanger (212) includes a red copper tube with fins.

Images