Low-temperature dead steam absorber device

Abstract

The utility model discloses a low-temperature dead steam absorber device, which belongs to the technical field of absorbers and is characterized in that a narrow-channel long-flow heat exchange cavity is arranged in a heat exchange box body, a cooling water pipe group is arranged in the heat exchange cavity, and a concentrated solution inlet is arranged at the top of the heat exchange cavity or on the side wall close to the top of the heat exchange cavity; a channel communicated with the dilute solution collecting box is arranged at the bottom of the heat exchange cavity or close to the side wall of the bottom. Through the synergistic effect of the narrow-channel long-flow heat exchange cavity design and the liquid distribution unit, the absorption efficiency and waste heat recovery capacity of low-temperature dead steam are remarkably improved; a narrow-channel long-flow structure prolongs the contact path of a concentrated solution and flash steam, and is matched with a matrix type cooling water pipe group to enhance the heat and mass transfer efficiency; the observation window monitors the state of a solution in real time, the density meter connector accurately controls the concentration, the overall structure is compact, installation and maintenance are convenient due to the modular design, and the device is suitable for efficient low-grade waste heat recovery under complex working conditions such as desulfurized flue gas of a coal-fired power plant.

Description

TECHNICAL FIELD

[0001] The utility model belongs to absorber technical field, especially a low temperature waste steam absorber device. BACKGROUND

[0002] Waste heat energy recycling is an important branch in the field of energy saving and environmental protection. China's industrial waste heat resources are rich, especially in coal-fired power generation, steel, non-ferrous, chemical industry, cement, building materials, petroleum and petrochemical, light industry and other industries, waste heat resources account for about 17% to 67% of total fuel consumption, among which about 60% of the total waste heat resources can be recycled, and the waste heat utilization has great potential. For example, in the thermal power industry, coal-fired power plants burn a large amount of coal during operation, and the generated heat energy is mainly used for power generation and heating, but a large amount of waste heat is discharged into the atmosphere with flue gas after desulfurization. Due to the presence of a large amount of pollutants and impurities in the flue gas, there are serious corrosion and blockage problems, and it is impossible to use conventional closed absorption method for heat exchange.

[0003] Absorption heat pump is a kind of heat driven device, which realizes the "transportation" or "temperature rise" of heat energy through absorption-desorption cycle. Its core function is to absorb heat from low temperature heat source and transfer heat to high temperature user end with external driving heat source, realizing efficient utilization of heat energy, which is an effective device for recycling low temperature heat energy. Absorption heat pump can be divided into closed heat pump and open heat pump, and at present, closed heat pump is widely used. However, compared with closed heat pump, open heat pump has the advantages of simple structure, flexible absorption agent replacement, direct use of environmental medium, efficient treatment of low concentration pollutants, reduction of secondary pollution and other advantages.

[0004] Closed absorption heat pump adopts full closed cycle, and water-lithium bromide working pair is used as the core. Low temperature waste heat enters the evaporator to evaporate and absorb heat of the refrigerant, and the generated water vapor is absorbed by the lithium bromide concentrated solution in the absorber and releases heat. Then, the dilute solution is heated by the external high temperature heat source to regenerate, and the separated water vapor is condensed in the condenser to release heat, and the liquid water returns to the evaporator after throttling to circulate. The working medium is completely closed, depends on high temperature driving heat source, and is suitable for industrial waste heat recovery and high temperature heating. While open absorption heat pump directly interacts with environmental medium, and flash steam directly contacts with concentrated solution, water vapor is absorbed and releases heat. The dilute solution is regenerated by waste heat, water is evaporated and discharged, and the solution restores the concentration for recycling. The working medium is partially open, can use low grade heat source, and is suitable for low temperature waste heat recovery. Therefore, open absorption heat pump can be used to recycle low quality energy in low temperature waste steam such as coal-fired power plant desulfurization flue gas.

[0005] In view of the problems of low contact area between traditional absorber working medium and waste steam and low mass transfer efficiency, a low temperature waste steam absorber device is provided. Utility model content

[0006] The utility model discloses a low-temperature exhaust steam absorber device to solve the above-mentioned problems existing in the prior art.

[0007] Technical scheme: a low-temperature exhaust steam absorber device, comprising: a heat exchange box body, a narrow channel long process heat exchange cavity is arranged in the heat exchange box body, a cooling water pipe group is arranged in the heat exchange cavity, a concentrated solution inlet is arranged on the top or near the top side wall of the heat exchange cavity, and a passage communicated with a dilute solution collecting box is arranged on the bottom or near the bottom side wall of the heat exchange cavity.

[0008] Further, the heat exchange box body is provided with a liquid distribution unit communicated with the concentrated solution inlet, and the liquid distribution unit is used for uniformly distributing liquid to the cooling water pipe group.

[0009] Further, the liquid distribution unit comprises: a liquid distribution pipe communicated with the concentrated solution inlet, and a plurality of first liquid distribution holes for uniformly distributing liquid to the cooling water pipe group are formed in the liquid distribution pipe.

[0010] Further, the liquid distribution unit further comprises a liquid distribution plate between the liquid distribution pipe and the cooling water pipe group, and a plurality of second liquid distribution holes for uniformly distributing liquid to the cooling water pipe group are formed in the liquid distribution plate.

[0011] Further, the heat exchange box body is provided with a vacuum pump interface communicated with the heat exchange cavity.

[0012] Further, a gas pressure communication pipeline is arranged between the dilute solution collecting box and the heat exchange cavity.

[0013] Further, a flash steam inlet communicated with the heat exchange cavity is arranged on the bottom or near the bottom side wall of the heat exchange box body.

[0014] Further, at least one observation window is arranged on the heat exchange box body.

[0015] Further, the dilute solution collecting box is located below the heat exchange box body.

[0016] Further, a dilute solution discharge outlet and a densimeter interface are arranged on the dilute solution collecting box.

[0017] Beneficial effects:

[0018] The low-temperature waste steam absorber device improves the absorption efficiency and waste heat recovery capacity of the low-temperature waste steam through the cooperation of the narrow channel long process heat exchange cavity design and the liquid distribution unit; the narrow channel long process structure prolongs the contact path of the concentrated solution and the flash steam, and cooperates with the matrix type cooling water pipe group to strengthen the heat and mass transfer efficiency; the double liquid distribution structure of the liquid distribution pipe and the liquid distribution plate ensures the uniform distribution of the solution, forms a stable liquid film covering the heat exchange surface; the vacuum pump interface maintains the vacuum environment to reduce the steam condensation temperature, and the air pressure communication pipeline promotes the gravity flow of the dilute solution; the observation window monitors the solution state in real time, the density meter interface accurately controls the concentration, the overall structure is compact and the modular design is convenient for installation and maintenance, and is suitable for the efficient recovery of low-grade waste heat under complex conditions such as desulfurized flue gas of coal-fired power plants. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a structural schematic diagram of the utility model;

[0020] Fig. 2 is a side view of the utility model;

[0021] Fig. 3 is an observation window installation position schematic diagram of the utility model.

[0022] The figure signs are: heat exchange box 1, heat exchange cavity 2, cooling water pipe group 3, concentrated solution inlet 4, dilute solution collecting box 5, channel 6, liquid distribution unit 7, liquid distribution pipe 71, liquid distribution plate 72, vacuum pump interface 8, air pressure communication pipeline 9, flash steam inlet 10, observation window 11, dilute solution discharge outlet 12, density meter interface 13. DETAILED DESCRIPTION

[0023] In the following description, a large number of specific details are given to provide a more complete understanding of the utility model. However, it is obvious for those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, some technical features known in the art are not described to avoid confusion with the utility model.

[0024] As Figs. 1 to 3 shown, a low-temperature waste steam absorber device, comprising: a heat exchange box 1, a narrow channel long process heat exchange cavity 2 is arranged in the heat exchange box 1, a cooling water pipe group 3 is arranged in the heat exchange cavity 2, a concentrated solution inlet 4 is arranged on the top or near the top side wall of the heat exchange cavity 2, and a channel 6 in communication with a dilute solution collecting box 5 is arranged on the bottom or near the bottom side wall of the heat exchange cavity 2. The dilute solution collecting box 5 is located below the heat exchange box 1.

[0025] The cooling water pipe group 3 is composed of a plurality of horizontally arranged cooling water pipes, the cooling water pipes are filled in the heat exchange cavity 2 in a matrix to ensure the overall heat exchange efficiency, the cooling water pipes in each row can also be arranged alternately or randomly, and the arrangement is determined according to the actual situation, the cooling water pipes can be connected through a lock buckle, so that the pipe spacing is small and the connection is difficult in actual processing is avoided, and the pipe type of the cooling water pipe can be a light pipe, a corrugated pipe or a finned pipe; the heat exchange box 1 can be made of carbon steel or titanium material according to the actual working condition; the heat exchange cavity 2 adopts a narrow channel long process, which means that the concentrated solution can be fully contacted with steam and the cooling water pipe under the action of gravity in a limited space, and the concentrated solution can be fully heat exchanged after the long process to improve the heat exchange efficiency; the channel 6 can be a pipeline, when the installation space of the equipment is limited, the heat exchange box 1 and the dilute solution collecting box 5 can be connected through the pipeline, so as to meet the installation condition, and at the same time, the space position of the heat exchange box 1 can be arranged above the dilute solution collecting box 5, the dilute solution is transferred through gravity, or the dilute solution is driven to flow through a molten liquid pump, and the channel 6 can also be a through hole, when the heat exchange box 1 and the dilute solution collecting box 5 are designed integrally, the dilute solution in the heat exchange box 1 enters the dilute solution collecting box 5 through the through hole by gravity.

[0026] The heat exchange cavity 2 of the present application is a narrow channel long process, which limits the flow space of the concentrated solution, forms a thin layer of liquid film along the surface of the cooling water pipe and slowly flows, prolongs the liquid-vapor contact time and enhances the mass transfer effect. The long process design makes the concentrated solution experience a longer path under the action of gravity and fully mix with the countercurrent flashing steam, thereby improving the absorption efficiency. The narrow channel structure increases the degree of turbulence of the solution, destroys the boundary layer and strengthens heat and mass transfer. The matrix arrangement of the cooling water pipe further increases the heat exchange area and optimizes the heat transfer path. The design effectively solves the problems of insufficient contact area and low mass transfer efficiency of the traditional absorber, reduces the equipment volume and is suitable for high-efficiency recovery of low-grade heat sources. By controlling the channel size and process length, different working conditions can be flexibly adapted to ensure stable and efficient operation under low temperature conditions.

[0027] The heat exchange box 1 is provided with a liquid distribution unit 7 communicated with the concentrated solution inlet 4, and the liquid distribution unit 7 is used for uniformly distributing liquid to the cooling water pipe group 3. The liquid distribution unit 7 comprises a liquid distribution pipe 71 communicated with the concentrated solution inlet 4, and a plurality of first liquid distribution holes for uniformly distributing liquid to the cooling water pipe group 3 are formed in the liquid distribution pipe 71. The liquid distribution unit 7 further comprises a liquid distribution plate 72 located between the liquid distribution pipe 71 and the cooling water pipe group 3, and a plurality of second liquid distribution holes for uniformly distributing liquid to the cooling water pipe group 3 are formed in the liquid distribution plate 72.

[0028] The liquid distribution pipe 71 includes a vertical pipe for communicating with the concentrated solution inlet 4, and at least one horizontal pipe is arranged at the lower end of the vertical pipe, and a first liquid distribution hole is arranged on the horizontal pipe, and a plurality of horizontal pipes are communicated through connecting pipes, in order to improve the uniformity of liquid distribution, a liquid distribution plate 72 is arranged below the liquid distribution pipe 71, and the concentrated solution discharged from the first liquid distribution hole is uniformly distributed to the cooling water pipe group 3 through the second liquid distribution hole on the liquid distribution plate 72, the liquid distribution plate 72 can stabilize the flow of concentrated solution discharged from the liquid distribution pipe 71, ensure the stability of liquid distribution, and then make the concentrated solution drop stably and uniformly on the cooling water pipe through the second liquid distribution hole, thereby improving the heat exchange efficiency, wherein the liquid distribution pipe 71 and the liquid distribution plate 72 can be used alone or in combination, and subsequent solutions such as increasing the liquid distribution pipe, the liquid distribution plate or the liquid distribution net fall within the protection scope of the present application.

[0029] The heat exchange box 1 is provided with a vacuum pump interface 8 communicated with the heat exchange cavity 2, which is arranged for vacuum environment treatment of the heat exchange box 1 connected with external equipment.

[0030] The dilute solution collecting tank 5 and the heat exchange cavity 2 are provided with a gas pressure communication pipeline 9, which can be more beneficial to the dilute solution in the heat exchange cavity 2 entering the dilute solution collecting tank 5.

[0031] The bottom or the side wall close to the bottom of the heat exchange box 1 is provided with a flash steam inlet 10 communicated with the heat exchange cavity 2, which is arranged to make the flash steam enter from the bottom of the heat exchange cavity 2 and fully contact with the concentrated solution entering from the top of the heat exchange cavity 2 for countercurrent heat exchange, and cooperate with the long process design of the heat exchange cavity 2, the sufficient contact of the cooling water pipe with the concentrated solution for heat exchange and the slow falling speed of the concentrated solution, thereby enhancing the overall heat exchange efficiency.

[0032] The heat exchange box 1 is provided with at least one observation window 11, which is arranged for observing the flow state of the dilute solution and determining the flow of the dilute solution, the observation window 11 is provided with transparent glass and is sealed, and the number and arrangement position of the observation window 11 can be determined according to the long process of the heat exchange cavity 2 in the heat exchange box 1.

[0033] The dilute solution collecting tank 5 is provided with a dilute solution discharge outlet 12 and a densimeter interface 13, which can be separately collected or connected with a generator or a concentrated and dilute solution heat exchanger, and the densimeter interface 13 is used for installing a densimeter for real-time acquisition of the density of the dilute solution and the concentration change of the dilute solution.

[0034] Working process:

[0035] First, close the valve at the concentrated solution inlet 4, the dilute solution outlet 12, the flash steam inlet 10, open the valve at the vacuum pump interface 8, reduce the pressure in the heat exchange box 1 to the target pressure by the vacuum pump, then open the valve at the concentrated solution inlet 4;

[0036] Then, under the action of the pressure difference, the concentrated solution enters the area above the liquid distribution plate 72 from the liquid distribution pipe 71, and the concentrated solution drops uniformly and stably on the cooling water pipe group 3 from the second liquid distribution hole on the liquid distribution plate 72;

[0037] Next, open the valve at the flash steam inlet 10, and the 30-50℃ flash steam enters the heat exchange cavity 2 from the inlet, diffuses to the top of the heat exchange cavity 2 under the action of the pressure difference, is absorbed by the concentrated solution flowing down from the top liquid distribution plate 72, releases a large amount of heat, and completes heat exchange with the cooling water at the cooling water pipe group 3 to realize energy recovery;

[0038] Finally, the dilute solution that has completed absorption enters the dilute solution collection box 5 through the channel 6, and when the experiment is completed, the vacuum pump is closed, and the valve at the dilute solution outlet 12 is opened to discharge the dilute solution.

[0039] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the specific details in the above embodiments, and various equivalent transformations can be made to the technical solutions of the utility model within the technical concept of the utility model, and these equivalent transformations all belong to the protection scope of the utility model.

Claims

1. A low temperature exhaust steam absorber apparatus, characterized by, The application relates to a heat exchange box body (1) provided with a narrow-channel long-process heat exchange cavity (2) and a cooling water pipe group (3) in the heat exchange cavity (2), a concentrated solution inlet (4) arranged on the top or the side wall close to the top of the heat exchange cavity (2), and a passage (6) communicated with a dilute solution collecting box (5) arranged on the bottom or the side wall close to the bottom of the heat exchange cavity (2). A liquid distribution unit (7) is arranged in the heat exchange box body (1) and communicated with the concentrated solution inlet (4), and the liquid distribution unit (7) is used for uniformly distributing liquid to the cooling water pipe group (3).

2. The cryogenic exhaust absorption apparatus of claim 1, wherein, The liquid distribution unit (7) comprises a liquid distribution pipe (71) communicated with the concentrated solution inlet (4), and a plurality of first liquid distribution holes are formed in the liquid distribution pipe (71) and used for uniformly distributing liquid to the cooling water pipe group (3).

3. The cryogenic exhaust heat absorber apparatus of claim 2, wherein, The liquid distribution unit (7) further comprises a liquid distribution plate (72) arranged between the liquid distribution pipe (71) and the cooling water pipe group (3), and a plurality of second liquid distribution holes are formed in the liquid distribution plate (72) and used for uniformly distributing liquid to the cooling water pipe group (3).

4. The cryogenic exhaust heat absorber apparatus of claim 3, wherein, A vacuum pump interface (8) communicated with the heat exchange cavity (2) is arranged on the heat exchange box body (1).

5. The cryogenic exhaust absorption apparatus of claim 1, wherein, An air pressure communication pipeline (9) is arranged between the dilute solution collecting box (5) and the heat exchange cavity (2).

6. The cryogenic exhaust absorption apparatus of claim 1, wherein, A flash steam inlet (10) communicated with the heat exchange cavity (2) is arranged on the bottom or the side wall close to the bottom of the heat exchange box body (1).

7. The cryogenic exhaust heat absorber apparatus of claim 1, wherein, At least one observation window (11) is arranged on the heat exchange box body (1).

8. The cryogenic exhaust heat absorber apparatus of claim 1, wherein, The dilute solution collecting box (5) is arranged below the heat exchange box body (1).

9. The cryogenic exhaust heat absorber apparatus of claim 1, wherein, A dilute solution discharge outlet (12) and a densimeter interface (13) are arranged on the dilute solution collecting box (5).

10. The cryogenic exhaust absorption apparatus of claim 1, wherein, ​

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