CN115560348A

CN115560348A - Refrigeration water-saving treatment system utilizing boiler exhaust smoke waste heat

Info

Publication number: CN115560348A
Application number: CN202211103957.XA
Authority: CN
Inventors: 周广权; 采有林; 王勇; 宋端阳; 田建明
Original assignee: Beijing SPC Environment Protection Tech Co Ltd
Current assignee: Beijing SPC Environment Protection Tech Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-01-03

Abstract

The invention relates to a refrigeration water-saving treatment system utilizing waste heat of boiler exhaust smoke, which comprises a low-temperature heat exchanger, an air cooling tower, a regenerative heat exchanger, a lithium bromide refrigerator and a cryogenic heat exchanger; the outlet of the flue gas heat exchange channel of the low-temperature heat exchanger is connected with the desulfurizing tower, and the outlet of the heat exchange tube, the generator inlet and the generator outlet of the lithium bromide refrigerator and the inlet of the heat exchange tube are connected end to end; an evaporator outlet of the lithium bromide refrigerator, a tube pass inlet and outlet of the cryogenic heat exchanger and an evaporator inlet are connected end to end; the shell side inlet of the cryogenic heat exchanger is connected with the gas phase outlet of the second gas-liquid separator, the shell side outlet of the cryogenic heat exchanger is connected with the inlet of the third gas-liquid separator, and the gas phase inlet of the third gas-liquid separator is connected with the shell side inlet of the regenerative heat exchanger; the inlet of the heat exchanger in the air cooling tower is connected with the desulfurizing tower, the outlet of the heat exchanger is connected with the inlet of the first gas-liquid separator, and the gas-phase outlet of the first gas-liquid separator, the tube side inlet of the regenerative heat exchanger, the tube side outlet and the inlet of the second gas-liquid separator are sequentially connected. The advantages are that: can reduce water consumption.

Description

Refrigeration water-saving treatment system utilizing boiler exhaust smoke waste heat

Technical Field

The invention relates to the technical field of energy conservation and emission reduction of a power plant boiler system, in particular to a refrigeration water-saving treatment system utilizing waste heat of boiler exhaust smoke.

Background

At present, the most main power generation mode in China is thermal power generation, and accounts for 62.2% of the total power generation amount in China. Most coal-fired power plants in China adopt a limestone-gypsum wet desulphurization technology to carry out desulphurization treatment on flue gas, the technology has the advantages of high desulphurization efficiency and stable operation, but a large amount of fresh water needs to be supplemented in the production process, and a large amount of desulphurization wastewater is generated at the same time, so that the technology has great influence on water-deficient areas in the north. The current zero-emission technical research mainly focuses on waste water evaporation, but the problem of water recovery is less concerned. In order to reduce the water consumption of a wet desulphurization system and relieve the environmental pressure of the current water resources, a water-saving method is provided.

Water consumption of a wet desulphurization system is mainly three aspects, namely water carried by flue gas, water carried by gypsum and wastewater discharge, wherein the water carried by the flue gas accounts for the main part. The flue gas at the outlet of the desulfurizing tower is saturated wet flue gas, and when the temperature of the flue gas is reduced from one saturated state to another saturated state, the moisture in the flue gas is separated out. Taking a 600MW electric generating set as an example, when the temperature of the flue gas is reduced from 50 ℃ to 30 ℃, the moisture in the flue gas is reduced from 14% to 5%, and when the temperature of the flue gas is 2 x 10 ⁶ Nm ³ And meanwhile, the heat of about 300GJ/h can be recovered by cooling the flue gas to 20 ℃, the heat source for energy-saving projects such as heating can be recovered, and the evaporation capacity of the desulfurizing tower is reduced.

Based on the above, a new refrigeration water-saving treatment system capable of effectively saving water and utilizing waste heat of boiler exhaust smoke needs to be developed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a refrigeration water-saving treatment system utilizing waste heat of boiler exhaust smoke, and effectively overcomes the defects of the prior art.

The technical scheme for solving the technical problems is as follows:

a refrigeration water-saving treatment system utilizing waste heat of boiler exhaust smoke comprises a low-temperature heating system, a smoke air-cooling water-saving system, a low-temperature smoke regenerative system, a lithium bromide refrigeration system and a clean smoke deep cooling system; the low-temperature heating system comprises a low-temperature heat exchanger, the flue gas air-cooling water-saving system comprises an air cooling tower and a first gas-liquid separator, the low-temperature flue gas heat recovery system comprises a heat recovery heat exchanger and a second gas-liquid separator, the lithium bromide refrigeration system comprises a lithium bromide refrigerator, and the clean flue gas deep cooling system comprises a deep cooling heat exchanger and a third gas-liquid separator; the low-temperature heat exchanger is provided with a flue gas heat exchange channel and a heat exchange tube wound outside the flue gas heat exchange channel, the inlet of the flue gas heat exchange channel is connected with a flue gas pipeline, the outlet of the flue gas heat exchange channel is connected with a desulfurizing tower, and the outlet of the heat exchange tube, the generator inlet and the generator outlet of a lithium bromide refrigerator are sequentially connected with the inlet of the heat exchange tube end to end; the outlet of the evaporator of the lithium bromide refrigerator, the tube pass inlet and the outlet of the cryogenic heat exchanger and the inlet of the evaporator of the lithium bromide refrigerator are sequentially connected end to end; a shell side inlet of the cryogenic heat exchanger is connected with a gas phase outlet of the second gas-liquid separator, a shell side outlet of the cryogenic heat exchanger is connected with an inlet of the third gas-liquid separator, and a gas phase inlet of the third gas-liquid separator is connected with a shell side inlet of the regenerative heat exchanger; the air cooling tower is internally provided with a heat exchanger, the inlet of the heat exchanger is connected with the flue of the desulfurizing tower, the outlet of the heat exchanger is connected with the inlet of the first gas-liquid separator, and the gas-phase outlet of the first gas-liquid separator, the tube side inlet and the tube side outlet of the regenerative heat exchanger and the inlet of the second gas-liquid separator are sequentially connected.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the low-temperature heating system further comprises a heat medium cache box, and the heat medium cache box is communicated between an outlet of the generator of the lithium bromide refrigerator and an inlet of the heat exchange tube.

The liquid phase outlet of the first gas-liquid separator, the liquid phase outlet of the second gas-liquid separator and the liquid phase outlet of the third gas-liquid separator are respectively connected with the condensed water tank.

Further, the shell side outlet of the regenerative heat exchanger, the gas phase outlet of the first gas-liquid separator and the flue of the desulfurizing tower are respectively connected with a tail gas discharging device through tail gas pipelines.

Further, a first induced draft fan is arranged on the tail gas pipeline.

Further, the lithium bromide refrigeration system further comprises a cold water cache tank, and the cold water cache tank is communicated between a tube pass outlet of the cryogenic heat exchanger and an inlet of an evaporator of the lithium bromide refrigerator.

And the branch flue gas pipeline is connected in parallel with the flue gas heat exchange channel and is connected between the flue gas pipeline and the desulfurizing tower.

Furthermore, the inlet and outlet of the condenser of the lithium bromide refrigerator are connected with a circulating water pipeline of a plant area of a power plant.

Furthermore, an electric dust removal device is arranged on the flue gas pipeline.

Further, a second draught fan is communicated between an outlet of the flue gas heat exchange channel and the desulfurizing tower.

The invention has the beneficial effects that: the system has the advantages of simple structure, capability of greatly reducing the comprehensive water consumption of the power plant, easy manufacture, safe and reliable use, convenient implementation, popularization and application and economic value of machines.

Drawings

FIG. 1 is a schematic structural diagram of a refrigeration water-saving treatment system using waste heat of boiler exhaust gas according to the present invention;

FIG. 2 is a schematic structural diagram of a low temperature heat exchanger in the refrigeration water-saving treatment system using waste heat of boiler exhaust gas of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

3. a desulfurizing tower; 4. a condensed water tank; 9. branching a flue gas line; 11. a low temperature heat exchanger; 12. a heating medium buffer tank; 21. an air cooling tower; 22. a first gas-liquid separator; 31. a regenerative heat exchanger; 32. a second gas-liquid separator; 41. a lithium bromide refrigerator; 42. a cold water buffer tank; 51. a cryogenic heat exchanger; 52. a third gas-liquid separator; 111. a heat exchange pipe; 211. a heat exchanger.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

The embodiment is as follows: as shown in fig. 1 (the arrow in fig. 1 indicates the fluid flowing direction), the refrigeration water-saving treatment system using the waste heat of the boiler exhaust gas of the present embodiment mainly includes five main core portions: the system comprises a low-temperature heating system, a flue gas air cooling water-saving system, a low-temperature flue gas heat regeneration system, a lithium bromide refrigerating system and a clean flue gas deep cooling system.

The cryogenic heating system comprises a cryogenic heat exchanger 11.

The flue gas air cooling water-saving system comprises an air cooling tower 21 and a first gas-liquid separator 22.

The low-temperature flue gas regenerative system comprises a regenerative heat exchanger 31 and a second gas-liquid separator 32.

The lithium bromide refrigeration system described above includes a lithium bromide refrigerator 41.

The net flue gas cryogenic system includes a cryogenic heat exchanger 51 and a third gas-liquid separator 52.

As shown in fig. 2 (the arrow in fig. 2 indicates the direction of fluid flow), the low-temperature heat exchanger 11 has a flue gas heat exchange channel (indicated by a in the figure) and a heat exchange tube 111 wound outside the flue gas heat exchange channel, the inlet of the flue gas heat exchange channel is connected to a flue gas pipeline, the outlet of the flue gas heat exchange channel is connected to the desulfurizing tower 3, and the outlet of the heat exchange tube 111, the generator inlet and the generator outlet of the lithium bromide refrigerator 41 are sequentially connected end to end with the inlet of the heat exchange tube 111; the outlet of the evaporator of the lithium bromide refrigerator 41, the tube pass inlet and outlet of the cryogenic heat exchanger 51 and the inlet of the evaporator of the lithium bromide refrigerator 41 are sequentially connected end to end; a shell-side inlet of the cryogenic heat exchanger 51 is connected with a gas-phase outlet of the second gas-liquid separator 32, a shell-side outlet of the cryogenic heat exchanger 51 is connected with an inlet of the third gas-liquid separator 52, and a gas-phase inlet of the third gas-liquid separator 52 is connected with a shell-side inlet of the regenerative heat exchanger 31; the air cooling tower 21 is provided with a heat exchanger 211, an inlet of the heat exchanger 211 is connected to the flue of the desulfurization tower 3, an outlet of the heat exchanger 211 is connected to an inlet of the first gas-liquid separator 22, and a gas phase outlet of the first gas-liquid separator 22, a tube side inlet and a tube side outlet of the regenerative heat exchanger 31, and an inlet of the second gas-liquid separator 32 are connected in this order.

In the whole system, all the functional ports are connected by adopting adaptive pipelines, the medium at the outlet of the low-temperature heat exchanger 11 is heated to 100-120 ℃ by utilizing the waste heat of the flue gas, a heat source is provided for the lithium bromide refrigerator 41, the desulfurized saturated clean flue gas is cooled by the air cooling tower 21, enters the tube side of the regenerative heat exchanger 31 for cooling, then enters the shell side of the cryogenic heat exchanger 51 for further cooling, enters the shell side of the regenerative heat exchanger 31 and is discharged; in the process, after the desulfurized clean flue gas is cooled for three times, a large amount of condensed water is separated out from the flue gas, and the condensed water is collected after passing through the corresponding three gas-liquid separators.

Specifically, the five core components in the present embodiment specifically function as follows:

the flue gas air cooling water saving device mainly aims at: the desulfurized saturated flue gas from the desulfurizing tower 3 is cooled again through the air cooling tower 21, and the saturated flue gas can be cooled to 35-40 ℃ according to the process requirements because the cooling amplitude has a large influence on the local environment temperature;

the low-temperature flue gas heat recovery device aims at: heating low-temperature flue gas (25-30 ℃) from a clean flue gas deep cooling system to 30-35 ℃ through heat exchange, and cooling the flue gas (35-40 ℃) from an air cooling tower 21 to 30-35 ℃ through the flue gas at the outlet of a regenerative heat exchanger 31;

in this embodiment, the main purpose of the lithium bromide refrigeration system is: the heat source delivered by the low temperature heat exchanger 11 enters the generator of the lithium bromide refrigerator 41, and the heat of the steam is taken away by the condenser which enters the lithium bromide refrigerator 41 through the cooling circulating water, so as to prepare cold water with the temperature of 10-15 ℃, wherein the heat source medium of the lithium bromide refrigerator 41 adopts glycol solution, and the temperature is controlled between 100-110 ℃;

the net flue gas cryogenic system mainly aims at: cold water (10-15 ℃) from the lithium bromide refrigerator 41 enters a cryogenic heat exchanger 51 to further cool the saturated flue gas from 30-35 ℃ to 25-30 ℃.

It needs to be added that: in the low temperature heating system, the pipeline that the export of flue gas heat transfer passageway is connected with desulfurizing tower 3 is equipped with the second draught fan, and, be equipped with the valve at the export of flue gas heat transfer passageway, the entrance of flue gas heat transfer passageway is connected with the isolating valve, low temperature heat exchanger 11 wholly adopts the gas-liquid double-phase countercurrent flow mode, the structure is similar to fin tube heat exchanger (product of prior art), the fin makes the boundary layer constantly break to the disturbance of fluid, therefore has great heat transfer coefficient, simultaneously because the fin is very thin, has high thermal conductivity, can reach very high efficiency, in addition, in this embodiment, be equipped with flue gas dust removal equipment (M indicates in the picture) on above-mentioned flue gas pipeline, after the electric precipitation, most sulfur trioxide and sulfate in the flue gas are got rid of in the electric precipitation, sulfur trioxide is very little in the shell pass (flue gas heat transfer passageway) flue gas that gets into low temperature heat exchanger 11, so the dew point of this flue gas is little less than the dew point of air preheater department, when the aqueous vapor content is between 6-14%, the sulfur dioxide concentration is below 1%, the dew point of flue gas is generally around 60 ℃, control heater exhanst gas outlet is above 80 ℃, can reduce the corruption of flue gas to the heat exchanger. The outlet temperature of the heating medium of the heater tube pass can be controlled to be more than 100 ℃.

In this embodiment, the air cooling tower 21 adopts a hyperbolic air duct and an adjustable vent, the air duct is internally provided with the heat exchanger 211, and the heat exchanger 211 adopts a large-diameter fin tube heat exchanger and adopts a gas-gas two-phase countercurrent heat exchange mode. Because the fin continuously breaks the boundary layer due to disturbance of fluid, the fin has a larger heat exchange coefficient, and simultaneously, because the fin is very thin, the fin has high heat conductivity, and very high efficiency can be achieved. A low-temperature flue gas channel is arranged in the heat exchanger 211, the flow speed of flue gas is controlled within 5m/s, an air channel is arranged outside the heat exchanger, and the heat exchanger 211 is made of corrosion-resistant stainless steel materials because a small amount of sulfur dioxide is contained in the flue gas and the condensation water process is acidic.

In this embodiment, the regenerative heat exchanger 31 is a large-diameter finned tube heat exchanger, and adopts a gas-gas two-phase countercurrent heat exchange mode. Because the fin disturbs the fluid, the boundary layer is continuously broken, so that the fin has a larger heat exchange coefficient, and meanwhile, because the fin is very thin, the fin has high heat conductivity, and very high efficiency can be achieved. The tube side of the regenerative heat exchanger 31 is a low-temperature flue gas channel, the flow rate of flue gas is controlled within 5m/s, the shell side of the regenerative heat exchanger 31 is a high-temperature flue gas channel, and condensed water is acidic due to the fact that the flue gas contains a small amount of sulfur dioxide, and the heat exchanger is made of corrosion-resistant stainless steel.

In this embodiment, the lithium bromide refrigerator 41 is of a hot water type, the heating medium is a high-boiling point glycol solution, and the temperature of the heating medium is controlled between 100 ℃ and 120 ℃ during operation.

In this embodiment, the cryogenic heat exchanger 51 is a fin tube heat exchanger and adopts a gas-liquid two-phase countercurrent heat exchange mode. Because the fin continuously breaks the boundary layer due to disturbance of fluid, the fin has a larger heat exchange coefficient, and simultaneously, because the fin is very thin, the fin has high heat conductivity, and very high efficiency can be achieved. The tube side of the cryogenic heat exchanger 51 is a cold water channel, the shell side of the cryogenic heat exchanger 51 is a flue gas channel, and the cryogenic heat exchanger 51 is made of corrosion-resistant stainless steel materials because the flue gas contains a small amount of sulfur dioxide and the condensed water side is acidic.

In a preferred embodiment, the low temperature heating system further includes a heat medium buffer tank 12, and the heat medium buffer tank 12 is disposed between an outlet of the generator of the lithium bromide refrigerator 41 and an inlet of the heat exchanging pipe 111 in a communication manner.

In the above embodiment, the heat medium buffer tank 12 is used for buffering the fluid from the generator outlet of the lithium bromide refrigerator 41, so that the flow rate of the fluid from the heat medium buffer tank 12 entering the heat exchange tube 111 matches with the system, and a good heat exchange effect is achieved, and meanwhile, a delivery pump is arranged on the pipeline between the heat medium buffer tank 12 and the inlet of the heat exchange tube 111, so as to ensure good flow of the fluid in the pipeline.

It needs to be further added that: the outlet of the evaporator of the lithium bromide refrigerator 41 is also connected with a cold water station (prior art) at other points in the plant area through a pipeline, and a water return pipeline of the cold water station returns to the inlet of the evaporator, and also can return to the heating medium buffer tank 12.

In a preferred embodiment, the gas-liquid separator further includes a condensed water tank 4, and the liquid phase outlet of the first gas-liquid separator 22, the liquid phase outlet of the second gas-liquid separator 32, and the liquid phase outlet of the third gas-liquid separator 52 are connected to the condensed water tank 4, respectively.

In the above embodiment, the condensed water in the three gas-liquid separators (the first gas-liquid separator 22, the second gas-liquid separator 32, and the third gas-liquid separator 52) is collected by the condensed water tank 4, so that the condensed water collection process is simplified, and the collected condensed water can be transported to each water using station through a pipeline for recycling.

In this embodiment, be equipped with first draught fan on the above-mentioned tail gas pipeline, more do benefit to the emission of final flue gas under the effect of first draught fan.

In a preferred embodiment, the lithium bromide refrigeration system further includes a cold water buffer tank 42, and the cold water buffer tank 42 is disposed in communication between an outlet of the tube side of the cryogenic heat exchanger 51 and an inlet of the evaporator of the lithium bromide refrigerator 41.

In the above embodiment, the design of the cold water buffer tank 42 is more beneficial to the refrigerant to continuously enter the evaporator of the lithium bromide refrigerator 41 to realize good heat exchange, and the liquid phase outlets of the three gas-liquid separators in the system are all connected with the condensate water tank 4 through the drain valves.

As a preferable embodiment, the flue gas desulfurization system further comprises a branch flue gas pipeline 9, and the branch flue gas pipeline 9 is connected in parallel with the flue gas heat exchange channel and is connected between the flue gas pipeline and the desulfurization tower 3.

In the above embodiment, the branch flue gas pipeline 9 is mainly used for commissioning when the system is shut down or overhauled, so as to ensure normal discharge of flue gas, and generally, a flow valve or a control valve is arranged on the branch flue gas pipeline 9.

In a preferred embodiment, the shell-side outlet of the regenerative heat exchanger 31, the gas-phase outlet of the first gas-liquid separator 22, and the flue of the desulfurizing tower 3 are connected to a tail gas discharging device through a tail gas pipeline.

In the embodiment, the flue gas dewatered by the gas-liquid separator and the saturated clean flue gas which is directly discharged by the desulfurizing tower and is not cooled converge and mix in the tail gas pipeline, so that the unsaturation degree of the flue gas is improved, the corrosion of facilities is reduced, and the white smoke plume in the final discharged smoke is reduced.

In this embodiment, a delivery pump is added to each pipeline according to actual needs to make the fluid in the pipeline normally flow, for example, a delivery pump is set on the pipeline connecting the generator outlet of the lithium bromide refrigerator 41 (or the heat medium buffer tank 12) and the inlet of the heat exchange tube 111, and a delivery pump is also set on the pipeline connecting the evaporator inlet of the lithium bromide refrigerator 41 and the cold water buffer tank 42, in this embodiment, at the beginning of system operation, the delivery pump on the pipeline of the low temperature heat exchanger 11 is started first, the low temperature heater inlet and outlet valves are opened, and the heat medium starts to heat up; when the temperature of the heating medium reaches 100 ℃, starting the lithium bromide refrigerator 41 to start refrigeration, simultaneously starting a delivery pump on a pipeline connected between an evaporator inlet of the lithium bromide refrigerator 41 and the cold water buffer tank 42, and when the temperature of the cold water is reduced to 10 ℃, opening a hot port valve of the air cooling tower 21, and starting to introduce clean flue gas into the system; when the system normally operates, condensed water enters a condensed water tank 4 through a steam-water separator (the condensed water is sent to each water station again); when the outdoor temperature is low in winter and the cooling amplitude of the air cooling tower 21 is large, the cryogenic heat exchanger 51 can be stopped, and the desulfurized flue gas does not enter the cryogenic heat exchanger 51 (i.e., the valve on the connecting pipeline between the flue of the desulfurizing tower 3 and the tail gas pipeline is opened, and the valve on the pipeline through which the flue of the desulfurizing tower 3 flows to the regenerative heat exchanger 31 is closed), and is discharged through the tail gas pipeline by the tail gas discharge equipment.

In this embodiment, the inlet and outlet of the condenser of the lithium bromide refrigerator 41 are connected to the circulating water line of the power plant, and are used as the main source of the cooling water of the lithium bromide refrigerator 41.

In this embodiment, a second induced draft fan is arranged between the outlet of the flue gas heat exchange channel and the desulfurizing tower 3, so as to ensure smooth flow of fluid in the section of pipeline.

In this embodiment, the first induced draft fan and the second induced draft fan can overcome the flow resistance in each heat exchanger device in the system, ensure good flow of fluid in the pipeline, and promote good operation of the system, and generally, the flow velocity of fluid in each heat exchanger device in the system is lower than 5m/s.

In this embodiment, the water collection rates (i.e., the condensed water) of the three gas-liquid separators can all reach about 80%.

The air cooling tower 21 is a closed air cooling tower of the prior art.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides an utilize refrigeration water conservation processing system of boiler waste heat of discharging fume which characterized in that: the system comprises a low-temperature heating system, a flue gas air cooling water-saving system, a low-temperature flue gas heat regeneration system, a lithium bromide refrigerating system and a clean flue gas deep cooling system; the low-temperature heating system comprises a low-temperature heat exchanger (11), the flue gas air cooling water-saving system comprises an air cooling tower (21) and a first gas-liquid separator (22), the low-temperature flue gas heat recovery system comprises a heat recovery heat exchanger (31) and a second gas-liquid separator (32), the lithium bromide refrigerating system comprises a lithium bromide refrigerator (41), and the clean flue gas deep cooling system comprises a deep cooling heat exchanger (51) and a third gas-liquid separator (52);

the low-temperature heat exchanger (11) is provided with a flue gas heat exchange channel and a heat exchange tube (111) wound outside the flue gas heat exchange channel, the inlet of the flue gas heat exchange channel is connected with a flue gas pipeline, the outlet of the flue gas heat exchange channel is connected with a desulfurizing tower (3), and the outlet of the heat exchange tube (111), the generator inlet and the generator outlet of a lithium bromide refrigerator (41) are sequentially connected with the inlet of the heat exchange tube (111) end to end; an outlet of an evaporator of the lithium bromide refrigerator (41), a tube pass inlet and an outlet of the cryogenic heat exchanger (51) and an inlet of the evaporator of the lithium bromide refrigerator (41) are sequentially connected end to end; a shell-side inlet of the cryogenic heat exchanger (51) is connected with a gas-phase outlet of the second gas-liquid separator (32), a shell-side outlet of the cryogenic heat exchanger (51) is connected with an inlet of the third gas-liquid separator (52), and a gas-phase inlet of the third gas-liquid separator (52) is connected with a shell-side inlet of the regenerative heat exchanger (31);

a heat exchanger (211) is arranged in the air cooling tower (21), the inlet of the heat exchanger (211) is connected with the flue of the desulfurizing tower (3), the outlet of the heat exchanger (211) is connected with the inlet of the first gas-liquid separator (22), and the gas-phase outlet of the first gas-liquid separator (22), the tube side inlet and the tube side outlet of the regenerative heat exchanger (31) and the inlet of the second gas-liquid separator (32) are sequentially connected.

2. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: the low-temperature heating system further comprises a heating medium buffer tank (12), wherein the heating medium buffer tank (12) is communicated and arranged between the generator outlet of the lithium bromide refrigerator (41) and the inlet of the heat exchange pipe (111).

3. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: the liquid phase separator further comprises a condensed water tank (4), and a liquid phase outlet of the first gas-liquid separator (22), a liquid phase outlet of the second gas-liquid separator (32) and a liquid phase outlet of the third gas-liquid separator (52) are respectively connected with the condensed water tank (4).

4. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: and a shell side outlet of the regenerative heat exchanger (31), a gas phase outlet of the first gas-liquid separator (22) and a flue of the desulfurizing tower (3) are respectively connected with a tail gas discharge device through tail gas pipelines.

5. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 4, characterized in that: and a first induced draft fan is arranged on the tail gas pipeline.

6. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: lithium bromide refrigerating system still includes cold water buffer tank (42), cold water buffer tank (42) intercommunication sets up the tube side export of cryogenic heat exchanger (51) with between the entry of the evaporimeter of lithium bromide refrigerator (41).

7. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: still include branch flue gas pipeline (9), branch flue gas pipeline (9) with flue gas heat transfer passageway is parallelly connected, and be connected in between flue gas pipeline and desulfurizing tower (3).

8. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: and the inlet and outlet of the condenser of the lithium bromide refrigerator (41) are connected with a circulating water pipeline of a power plant area.

9. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: and an electric dust removal device is arranged on the flue gas pipeline.

10. The system for refrigerating and water-saving treatment by using waste heat of boiler exhaust smoke according to claim 1, characterized in that: and a second draught fan is communicated between the outlet of the flue gas heat exchange channel and the desulfurizing tower (3).