Industrial tail gas step-by-step cooling and separating equipment

Abstract

The utility model discloses industrial tail gas step-by-step cooling and separating equipment in the technical field of industrial tail gas treatment equipment. The industrial tail gas step-by-step cooling and separating equipment comprises a generating unit, a condensing and cooling unit, a low-pressure evaporation and absorption unit and a medium-pressure evaporation and absorption unit, a first-stage separation part is arranged in the generation unit, the condensation cooling unit comprises a condensation cavity, a cooling cavity and a second-stage separation part arranged in the cooling cavity, and the low-pressure evaporation absorption unit comprises a low-pressure evaporation cavity, a low-pressure absorption cavity and a third-stage separation part arranged in the low-pressure evaporation cavity; the medium-pressure evaporation and absorption unit comprises a medium-pressure evaporation cavity and a medium-pressure absorption cavity; the first rotational flow plate is arranged in the generation unit, the second rotational flow plate is arranged in the cooling cavity, and the third rotational flow plate is arranged in the low-pressure evaporation cavity, so that equipment for cooling and equipment for separation are integrated, and the overall size of the separation equipment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial tail gas treatment equipment technical field, concretely is a kind of industrial tail gas step-by-step cooling separation equipment. BACKGROUND

[0002] Tail gas generated in industrial production process often contains multiple components, including but not limited to water vapor, carbon dioxide, carbon monoxide, nitrogen, oxygen and various volatile organic compounds (VOCs) and harmful heavy metals, etc., among these components, part has recycling value, and in actual industrial production, it will also be certain high-temperature mixture through step-by-step cooling process to achieve the purpose of separating intermediate product, such as polysilicon reduction furnace tail gas step-by-step cooling separation intermediate product, petroleum refining step-by-step cooling decomposes various oil products, etc.;In the process of cooling and separating tail gas, it is generally cooled by cooling medium first, so that the tail gas becomes gas-liquid mixture, and then the gas-liquid mixture is introduced into the separation equipment for gas-liquid separation, since the tail gas needs to be cooled and separated multiple times (the tail gas contains multiple components), multiple cooling equipment and separation equipment are required, and the cooling equipment and separation equipment are independently arranged, which increases the overall equipment space. SUMMARY

[0003] The utility model discloses a kind of industrial tail gas step-by-step cooling separation equipment, to solve the problem that the overall equipment space is increased due to the tail gas needs to be cooled and separated multiple times, multiple cooling equipment and separation equipment are required, and the cooling equipment and separation equipment are independently arranged as raised in above background art.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of industrial tail gas step-by-step cooling separation equipment, comprising: generating unit, condensing cooling unit, low-pressure evaporation absorption unit and medium-pressure evaporation absorption unit;

[0005] The generating unit is equipped with a first separation piece, and the generating unit is used to absorb the heat of industrial tail gas and make it first cooling, and the first separation piece is used to separate the tail gas after first cooling;

[0006] The condensing cooling unit includes condensing cavity, cooling cavity and second separation piece arranged in the cooling cavity, the cooling cavity is used to second cooling after the tail gas of first separation, and the second separation piece is used to separate the tail gas after second cooling;

[0007] The low-pressure evaporation absorption unit includes low-pressure evaporation cavity, low-pressure absorption cavity and third separation piece arranged in the low-pressure evaporation cavity, the low-pressure evaporation cavity is used to third cooling after the tail gas of second separation, and the third separation piece is used to separate the tail gas after third cooling;

[0008] The medium-pressure evaporation absorption unit comprises a medium-pressure evaporation cavity and a medium-pressure absorption cavity.

[0009] Preferably, the separation device further comprises a low-pressure expansion valve, a medium-pressure expansion valve, a pressure-boosting pump, a solution pump and a pressure-reducing valve, the first separation member is a first cyclone plate, the second separation member is a second cyclone plate, and the third separation member is a third cyclone plate.

[0010] The generating unit comprises a first shell and two first tube boxes, the first shell is provided with a first heat exchange pipe communicating the two first tube boxes, and one of the first tube boxes is provided with a first cyclone plate.

[0011] The condensation cooling unit comprises a second shell and two second tube boxes, the second shell is provided with a second heat exchange pipe communicating the two second tube boxes, the condensation cooling unit is provided with a first partition plate, the first partition plate is used to divide the inner cavity of the condensation cooling unit into a condensation cavity and a cooling cavity, and one of the second tube boxes in the cooling cavity is provided with a second cyclone plate.

[0012] The low-pressure evaporation absorption unit comprises a third shell and two third tube boxes, the third shell is provided with a third heat exchange pipe communicating the two third tube boxes, the low-pressure evaporation absorption unit is provided with a first partition plate, the first partition plate is used to divide the inner cavity of the low-pressure evaporation absorption unit into a low-pressure evaporation cavity and a low-pressure absorption cavity, and one of the third tube boxes in the low-pressure evaporation cavity is provided with a third cyclone plate.

[0013] The medium-pressure evaporation absorption unit comprises a fourth shell and two fourth tube boxes, the fourth shell is provided with a fourth heat exchange pipe communicating the two fourth tube boxes, the medium-pressure evaporation absorption unit is provided with a second partition plate, the second partition plate is used to divide the inner cavity of the medium-pressure evaporation absorption unit into a medium-pressure evaporation cavity and a medium-pressure absorption cavity.

[0014] Preferably, the separation device further comprises a base, the generating unit and the medium-pressure evaporation absorption unit are detachably arranged on the base, the top of the generating unit, the bottom of the condensation cooling unit, the bottom of the low-pressure evaporation absorption unit and the top of the medium-pressure evaporation absorption unit are all provided with supports, the support of the condensation cooling unit is detachably connected with the support of the generating unit, and the support of the low-pressure evaporation absorption unit is detachably connected with the support of the medium-pressure evaporation absorption unit.

[0015] Preferably, the cooling cavity is located above the condensation cavity, the low-pressure evaporation cavity and the low-pressure absorption cavity are horizontally symmetrically arranged, and the medium-pressure evaporation cavity and the medium-pressure absorption cavity are horizontally symmetrically arranged.

[0016] Preferably, the first partition plate comprises a second partition plate arranged in the third shell and a first partition plate arranged in the third tube box, the second partition plate is provided with a first through hole, and the first through hole is provided with a first liquid baffle.

[0017] The second partition plate includes a third partition plate disposed within the fourth housing and a second partition plate disposed within the fourth pipe box. The third partition plate is provided with a second through-hole, and a second liquid baffle is provided within the second through-hole.

[0018] Preferably, the fourth tube box of the medium-pressure evaporation chamber is provided with two baffles to divide the inner cavity of the fourth tube box into three mutually isolated cavities.

[0019] Preferably, the second housing of the cooling cavity is provided with a baffle plate.

[0020] Preferably, a spray assembly is provided in the first housing of the generating unit, the third housing of the low-pressure evaporation chamber, the third housing of the low-pressure absorption chamber, the fourth housing of the medium-pressure evaporation chamber, and the fourth housing of the medium-pressure absorption chamber.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the first swirl plate is set inside the generating unit, the second swirl plate is set inside the cooling chamber, and the third swirl plate is set inside the low-pressure evaporation chamber, which is used to integrate the cooling equipment and the separation equipment, thereby reducing the overall volume of the separation equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the separation device of this utility model;

[0023] Figure 2 This utility model Figure 1 Schematic diagram of the AA surface structure;

[0024] Figure 3 This utility model Figure 1 Schematic diagram of the mid-BB surface structure;

[0025] Figure 4 This utility model Figure 3 Schematic diagram of the C-plane structure;

[0026] Figure 5 This utility model Figure 3 Schematic diagram of the DD surface structure;

[0027] Figure 6 This utility model Figure 3 Schematic diagram of the EE surface structure;

[0028] Figure 7 This utility model Figure 3 Schematic diagram of the mid-FF surface structure;

[0029] Figure 8 This utility model Figure 3 Schematic diagram of the GG surface structure.

[0030] Fig. 1, generating unit; 101, first shell; 102, first tube box; 103, first heat exchange tube; 104, first cyclone plate; 2, condensation cooling unit; 201, condensation cavity; 202, cooling cavity; 203, second shell; 204, second tube box; 205, second heat exchange tube; 206, baffle; 207, second cyclone plate; 208, first partition plate; 3, low-pressure evaporation absorption unit; 301, low-pressure evaporation cavity; 302, low-pressure absorption cavity; 303, second partition plate; 304, first liquid blocking plate; 305, third shell; 306, third tube box; 307, third heat exchange tube; 308, third cyclone plate; 309, first separation plate; 4, medium-pressure evaporation absorption unit; 401, medium-pressure evaporation cavity; 402, medium-pressure absorption cavity; 403, third partition plate; 404, second liquid blocking plate; 405, fourth shell; 406, fourth tube box; 407, fourth heat exchange tube; 408, second separation plate; 409, blocking plate; 5, base; 6, low-pressure expansion valve; 7, medium-pressure expansion valve; 8, pressure boosting pump; 9, solution pump; 10, pressure reducing valve; 11, support; 12, spraying assembly. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Embodiment 1

[0033] Please refer to Figure 1 An industrial tail gas step-by-step cooling and separation device, comprising: a generating unit 1, a condensation cooling unit 2, a low-pressure evaporation absorption unit 3, a medium-pressure evaporation absorption unit 4, a low-pressure expansion valve 6, a medium-pressure expansion valve 7, a pressure boosting pump 8, a solution pump 9, and a pressure reducing valve 10;

[0034] Please refer to Figure 1 and Figure 2 The generating unit 1 comprises a first shell 101 and two first tube boxes 102 respectively arranged at two ends of the first shell 101. A first heat exchange tube 103 is arranged in the inner cavity of the first shell 101, and the first heat exchange tube 103 communicates the two first tube boxes 102. A high-pressure rich liquid inlet, a high-pressure gaseous refrigerant outlet, and a high-pressure lean liquid outlet are arranged on the first shell 101. A hot source inlet is arranged on one of the first tube boxes 102, and two outlets are arranged on the other first tube box 102. A first cyclone plate 104 is arranged in the first tube box 102.

[0035] Please refer to Figure 1and Figure 2 The condensing cooling unit 2 comprises a second shell 203 and two second tube boxes 204 respectively arranged at two ends of the second shell 203, the inner cavity of the second shell 203 is provided with second heat exchange tubes 205 for connecting the two second tube boxes 204; the condensing cooling unit 2 is provided with a first partition plate 208 for dividing the inner cavity of the condensing cooling unit 2 into a condensing cavity 201 and a cooling cavity 202; the second shell 203 of the condensing cavity 201 is provided with a high-pressure liquid refrigerant outlet and a high-pressure gaseous refrigerant inlet communicated with the high-pressure gaseous refrigerant outlet of the generating unit 1, the two second tube boxes 204 of the condensing cavity 201 are respectively provided with a circulating water inlet and a circulating water outlet, the second shell 203 of the cooling cavity 202 is provided with a circulating water inlet communicated with the circulating water outlet of the condensing cavity 201 and a circulating water outlet, one second tube box 204 of the cooling cavity 202 is provided with an inlet communicated with one outlet of the generating unit 1, and the other second tube box 204 of the cooling cavity 202 is provided with two outlets and is provided with a second cyclone plate 207 in the second tube box 204;

[0036] Please refer to Figure 1 、 Figure 3 、 Figure 4 and Figure 6 The low-pressure evaporation absorption unit 3 comprises a third shell 305 and two third tube boxes 306 respectively arranged at two ends of the third shell 305, the inner cavity of the third shell 305 is provided with third heat exchange tubes 307 for connecting the two third tube boxes 306, and the inner cavity of the low-pressure evaporation absorption unit 3 is provided with a first partition plate for dividing the inner cavity of the low-pressure evaporation absorption unit 3 into a low-pressure evaporation cavity 301 and a low-pressure absorption cavity 302; the third shell 305 of the low-pressure evaporation cavity 301 is provided with a low-pressure liquid refrigerant inlet and a low-pressure gaseous refrigerant outlet, the low-pressure liquid refrigerant inlet is communicated with the high-pressure liquid refrigerant outlet of the condensing cavity 201 through a low-pressure expansion valve 6, one third tube box 306 of the low-pressure evaporation cavity 301 is provided with an inlet communicated with one outlet of the cooling cavity 202, the other third tube box 306 of the low-pressure evaporation cavity 301 is provided with two outlets and is provided with a third cyclone plate 308 in the third tube box 306, the third shell 305 of the low-pressure absorption cavity 302 is provided with a low-pressure lean liquid inlet, a low-pressure gaseous refrigerant inlet and a low-pressure lean liquid outlet, the low-pressure lean liquid inlet is communicated with the high-pressure lean liquid outlet of the generating unit 1 through a pressure reducing valve 10, the low-pressure gaseous refrigerant inlet is communicated with the low-pressure gaseous refrigerant outlet of the low-pressure evaporation cavity 301, and the two third tube boxes 306 of the low-pressure absorption cavity 302 are respectively provided with a circulating water inlet and a circulating water outlet;

[0037] Please refer to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 andFigure 8 The medium-pressure evaporation-absorption unit 4 comprises a fourth shell 405 and two fourth tube boxes 406 respectively arranged at two ends of the fourth shell 405, the fourth shell 405 is provided with fourth heat exchange tubes 407 in the inner cavity, and the fourth heat exchange tubes 407 are used for connecting the two fourth tube boxes 406; the inner cavity of the medium-pressure evaporation-absorption unit 4 is provided with a second partition plate, the second partition plate is used for dividing the inner cavity of the medium-pressure evaporation-absorption unit 4 into a medium-pressure evaporation cavity 401 and a medium-pressure absorption cavity 402; the fourth shell 405 of the medium-pressure evaporation cavity 401 is provided with a medium-pressure liquid refrigerant inlet and a medium-pressure gaseous refrigerant outlet, the medium-pressure liquid refrigerant inlet is communicated with the high-pressure liquid refrigerant outlet of the condensation cavity 201 through a medium-pressure expansion valve 7, the two fourth tube boxes 406 of the medium-pressure evaporation cavity 401 are respectively provided with inlets and outlets, the inlets of the medium-pressure evaporation cavity 401 are respectively communicated with one outlet of the generating unit 1, the cooling cavity 202 and the low-pressure evaporation cavity 301, the fourth shell 405 of the medium-pressure absorption cavity 402 is provided with a medium-pressure lean-rich liquid inlet, a medium-pressure gaseous refrigerant inlet and a medium-pressure rich liquid outlet, the medium-pressure lean-rich liquid inlet is communicated with the low-pressure lean-rich liquid outlet of the low-pressure absorption cavity 302 through a pressure-boosting pump 8, the medium-pressure gaseous refrigerant inlet is communicated with the medium-pressure gaseous refrigerant outlet of the medium-pressure evaporation cavity 401, the medium-pressure rich liquid outlet is communicated with the high-pressure rich liquid inlet of the generating unit 1 through a solution pump 9, the two fourth tube boxes 406 of the medium-pressure absorption cavity 402 are respectively provided with circulating water inlets and circulating water outlets, the circulating water inlets of the medium-pressure absorption cavity 402 are communicated with the circulating water outlets of the low-pressure absorption cavity 302, and the circulating water outlets of the medium-pressure absorption cavity 402 are communicated with the circulating water inlets of the condensation cavity 201.

[0038] In the embodiment, as a further optimized scheme, please refer to Figure 1 and Figure 2 The separation device further comprises a base 5, the bottom of the generating unit 1 and the bottom of the medium-pressure evaporation-absorption unit 4 are both provided with mounting racks, the mounting racks are fixed on the top wall of the base 5 through bolts, so that the generating unit 1 and the medium-pressure evaporation-absorption unit 4 can be detached from the top wall of the base 5; the top of the generating unit 1, the bottom of the condensation-cooling unit 2, the bottom of the low-pressure evaporation-absorption unit 3 and the top of the medium-pressure evaporation-absorption unit 4 are all provided with supports 11, the support 11 of the condensation-cooling unit 2 is detachably connected with the support 11 of the generating unit 1, the support 11 of the low-pressure evaporation-absorption unit 3 is detachably connected with the support 11 of the medium-pressure evaporation-absorption unit 4, and the supports 11 are all connected through cooperation of bolts and nuts, so that the condensation-cooling unit 2 and the generating unit 1 can be separated, and the low-pressure evaporation-absorption unit 3 and the medium-pressure evaporation-absorption unit 4 can also be separated.

[0039] In the embodiment, as a further optimized scheme, please refer to Figure 1The cooling cavity 202 is located above the condensing cavity 201, the low-pressure evaporation cavity 301 and the low-pressure absorption cavity 302 are horizontally symmetrically arranged, and the medium-pressure evaporation cavity 401 and the medium-pressure absorption cavity 402 are horizontally symmetrically arranged.

[0040] In the embodiment, as a further optimized scheme, please refer to Figure 1 、 Figure 4 and Figure 5 , the first partition plate comprises a second partition plate 303 arranged in the third shell 305 and a first partition plate 309 arranged in the third tube box 306, the second partition plate 303 is provided with a first through hole, the first through hole is a low-pressure gaseous refrigerant outlet of the low-pressure evaporation cavity 301 and a low-pressure gaseous refrigerant inlet of the low-pressure absorption cavity 302, and the first through hole is provided with a first liquid baffle 304; the second partition plate comprises a third partition plate 403 arranged in the fourth shell 405 and a second partition plate 408 arranged in the fourth tube box 406, the third partition plate 403 is provided with a second through hole, the second through hole is a medium-pressure gaseous refrigerant outlet of the medium-pressure evaporation cavity 401 and a medium-pressure gaseous refrigerant inlet of the medium-pressure absorption cavity 402, and the second through hole is provided with a second liquid baffle 404; the first through hole is arranged so that the low-pressure gaseous refrigerant outlet of the low-pressure evaporation cavity 301 is the low-pressure gaseous refrigerant inlet of the low-pressure absorption cavity 302; the second through hole is arranged so that the medium-pressure gaseous refrigerant outlet of the medium-pressure evaporation cavity 401 is the medium-pressure gaseous refrigerant inlet of the medium-pressure absorption cavity 402, so that the connection between the interfaces can use less pipeline and reduce the size of the equipment.

[0041] In the embodiment, as a further optimized scheme, please refer to Figure 7 and Figure 8 , two blocking plates 409 are arranged in the fourth tube box 406 of the medium-pressure evaporation cavity 401 to divide the inner cavity of the fourth tube box 406 into three cavities isolated from each other; three ports are arranged on the surfaces of the two fourth tube boxes 406 of the medium-pressure evaporation cavity 401, the three ports are communicated with the three cavities respectively, and the separated liquid ABC enters and exits the two fourth tube boxes and the fourth heat exchange tube 407 of the medium-pressure evaporation cavity 401 through the three ports, so that the separated liquid ABC will not be mixed together.

[0042] In the embodiment, as a further optimized scheme, please refer to Figure 2 , a plurality of baffles 206 are arranged in the inner cavity of the second shell 203 of the cooling cavity 202; the circulating water is guided through the plurality of baffles 206 to bend in the second shell 203, thereby increasing the contact time of the circulating water with the second heat exchange tube 205 in the cooling cavity 202 and improving the heat exchange efficiency.

[0043] In the embodiment, as a further optimized scheme, please refer to Figure 1The inner cavity top of the first shell 101 of the generating unit 1 is provided with a spraying assembly (the spraying assembly comprises a pipeline and a plurality of spray heads arranged on the pipeline), which is communicated with the high-pressure rich-liquid inlet; the inner cavity top of the third shell 305 of the low-pressure evaporation cavity 301 is provided with a spraying assembly, which is communicated with the low-pressure liquid refrigerant inlet; the inner cavity top of the third shell 305 of the low-pressure absorption cavity 302 is provided with a spraying assembly, which is communicated with the low-pressure lean-liquid inlet; the inner cavity top of the fourth shell 405 of the medium-pressure evaporation cavity 401 is provided with a spraying assembly, which is communicated with the medium-pressure liquid refrigerant inlet; and the inner cavity top of the fourth shell 405 of the medium-pressure absorption cavity 402 is provided with a spraying assembly, which is communicated with the medium-pressure secondary rich-liquid inlet.

[0044] It should be noted that the high-temperature gaseous mixture in the embodiment is composed of a plurality of components, and four components are taken as an example in the embodiment, and are represented by ABCD.

[0045] The working principle is as follows:

[0046] The high-temperature gaseous mixture (A+B+C+D) is introduced into the first heat exchange pipe 103 of the generating unit 1 as a heat source, the high-pressure rich-liquid transported by the solution pump 9 in the first shell 101 is heated, most of the low-boiling-point refrigerant in the high-pressure rich-liquid is desorbed to become high-pressure gaseous refrigerant, the high-pressure rich-liquid becomes high-pressure lean-liquid after removing the refrigerant, and the gaseous mixture itself is cooled, wherein the gaseous A with the highest dew point is condensed into liquid, and the high-temperature gaseous mixture (A+B+C+D) becomes high-temperature gaseous mixture (B+C+D)+liquid A after passing through the generating unit 1;

[0047] The generated high-pressure gaseous refrigerant enters the inside of the second shell 203 of the condensing cavity 201 and is condensed into high-pressure liquid refrigerant by the circulating water in the second heat exchange pipe 205, and is discharged; the high-pressure liquid refrigerant flowing out of the second shell 203 of the condensing cavity 201 is divided into two paths, one path is reduced in pressure into low-pressure liquid refrigerant by the low-pressure expansion valve 6 and enters the third shell 305 of the low-pressure evaporation cavity 301, and the other path is reduced in pressure into medium-pressure liquid refrigerant by the medium-pressure expansion valve 7 and enters the fourth shell 405 of the medium-pressure evaporation cavity 401;

[0048] The high-temperature gaseous mixture (B+C+D) and the liquid A enter the first tube box 102 of the generating unit 1, and the first cyclone plate 104 inside the first tube box 102 forces the gas-liquid mixture to generate cyclone flow, so that the gas-liquid two-phase is separated, the high-temperature liquid A generated by the separation enters the fourth heat exchange tube 407 of the medium-pressure evaporation cavity 401, and the high-temperature gaseous mixture (B+C+D) generated by the separation enters the second heat exchange tube 205 of the cooling cavity 202 and is cooled by the circulating water in the second shell 203 of the cooling cavity 202, the gaseous B with a higher dew point is condensed into liquid, and the high-temperature gaseous mixture (B+C+D) becomes the high-temperature gaseous mixture (C+D) + liquid B after passing through the cooling cavity 202;

[0049] The high-temperature gaseous mixture (C+D) and the liquid B enter the second tube box 204 of the cooling cavity 202, and the second cyclone plate 207 inside the second tube box 204 forces the gas-liquid mixture to generate cyclone flow, so that the gas-liquid two-phase is separated, the high-temperature liquid B generated by the separation enters the fourth heat exchange tube 407 of the medium-pressure evaporation cavity 401, and the high-temperature gaseous mixture (C+D) generated by the separation enters the third heat exchange tube 307 of the low-pressure evaporation cavity 301 and is cooled by the entered low-pressure liquid refrigerant, the gaseous C with a lower dew point is condensed into liquid, and the high-temperature gaseous mixture (C+D) becomes the high-temperature gaseous D + liquid C after passing through the low-pressure evaporation cavity 301;

[0050] The high-temperature gaseous D and the liquid C enter the third tube box 306 of the low-pressure evaporation cavity 301, and the third cyclone plate 308 inside the third tube box 306 forces the gas-liquid mixture to generate cyclone flow, so that the gas-liquid two-phase is separated into the gaseous D (final product) and the high-temperature liquid C; the high-temperature liquid C enters the fourth heat exchange tube 407 of the medium-pressure evaporation cavity 401 and is cooled again by the medium-pressure liquid refrigerant in the fourth shell 405 of the medium-pressure evaporation cavity 401 together with the high-temperature liquid A and the high-temperature liquid B entered before, and becomes the normal-temperature liquid A, the normal-temperature liquid B and the normal-temperature liquid C and is discharged;

[0051] The low-pressure liquid refrigerant entering the third shell 305 of the low-pressure evaporation cavity 301 is heated and becomes the low-pressure gaseous refrigerant, the low-pressure gaseous refrigerant enters the third shell 305 of the low-pressure absorption cavity 302; the high-pressure lean liquid discharged from the generating unit 1 is reduced in pressure by the pressure-reducing valve 10 to become the low-pressure lean liquid, enters the third shell 305 of the low-pressure absorption cavity 302, is mixed and absorbed with the low-pressure gaseous refrigerant from the low-pressure evaporation cavity 301 to become the low-pressure secondary rich liquid; the low-pressure secondary rich liquid is pressurized by the pressure-boosting pump 8 to become the medium-pressure secondary rich liquid, enters the fourth shell 405 of the medium-pressure absorption cavity 402, is mixed and absorbed with the medium-pressure gaseous refrigerant from the medium-pressure evaporation cavity 401 to become the medium-pressure rich liquid, and the medium-pressure rich liquid is pressurized by the solution pump 9 and then is sent to the generating unit 1 to continue the circulation work.

[0052] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An industrial off-gas stepwise cooling separation apparatus, characterized by: The utility model relates to a separation equipment for industrial exhaust gas, which comprises an occurrence unit (1), a condensation cooling unit (2), a low-pressure evaporation absorption unit (3) and a medium-pressure evaporation absorption unit (4). The occurrence unit (1) is provided with a primary separation member, and is used for absorbing heat of industrial exhaust gas and primary cooling of the exhaust gas. The condensation cooling unit (2) comprises a condensation cavity (201), a cooling cavity (202) and a secondary separation member arranged in the cooling cavity (202), the cooling cavity (202) is used for secondary cooling of the exhaust gas after primary separation, and the secondary separation member is used for separation of the exhaust gas after secondary cooling. The low-pressure evaporation absorption unit (3) comprises a low-pressure evaporation cavity (301), a low-pressure absorption cavity (302) and a tertiary separation member arranged in the low-pressure evaporation cavity (301), the low-pressure evaporation cavity (301) is used for tertiary cooling of the exhaust gas after secondary separation, and the tertiary separation member is used for separation of the exhaust gas after tertiary cooling. The medium-pressure evaporation absorption unit (4) comprises a medium-pressure evaporation cavity (401) and a medium-pressure absorption cavity (402). The separation equipment further comprises a low-pressure expansion valve (6), a medium-pressure expansion valve (7), a pressure boosting pump (8), a solution pump (9) and a pressure reducing valve (10), the primary separation member is a first cyclone plate (104), the secondary separation member is a second cyclone plate (207), and the tertiary separation member is a third cyclone plate (308).

2. The industrial off-gas stepwise cooling and separation apparatus according to claim 1, characterized in that: The occurrence unit (1) comprises a first shell (101) and two first pipe boxes (102), the first shell (101) is provided with a first heat exchange pipe (103) communicating the two first pipe boxes (102), and one of the first pipe boxes (102) is provided with a first cyclone plate (104). The condensation cooling unit (2) comprises a second shell (203) and two second pipe boxes (204), the second shell (203) is provided with a second heat exchange pipe (205) communicating the two second pipe boxes (204), the condensation cooling unit (2) is provided with a first partition plate (208), the first partition plate (208) is used for dividing the inner cavity of the condensation cooling unit (2) into a condensation cavity (201) and a cooling cavity (202), and one of the second pipe boxes (204) of the cooling cavity (202) is provided with a second cyclone plate (207). The low-pressure evaporation absorption unit (3) comprises a third shell (305) and two third pipe boxes (306), the third shell (305) is provided with a third heat exchange pipe (307) communicating the two third pipe boxes (306), the low-pressure evaporation absorption unit (3) is provided with a first partition plate, the first partition plate is used for dividing the inner cavity of the low-pressure evaporation absorption unit (3) into a low-pressure evaporation cavity (301) and a low-pressure absorption cavity (302), and one of the third pipe boxes (306) of the low-pressure evaporation cavity (301) is provided with a third cyclone plate (308). ​ The medium-pressure evaporation absorption unit (4) comprises a fourth shell (405) and two fourth pipe boxes (406), the fourth shell (405) is provided with a fourth heat exchange pipe (407) communicating the two fourth pipe boxes (406), and the medium-pressure evaporation absorption unit (4) is provided with a second partition plate, which is used for dividing the inner cavity of the medium-pressure evaporation absorption unit (4) into a medium-pressure evaporation cavity (401) and a medium-pressure absorption cavity (402).

3. An industrial off-gas stepwise cooling separation apparatus according to claim 2, characterized in that: The separation device further comprises a base (5), the generating unit (1) and the medium-pressure evaporation absorption unit (4) are detachably arranged on the base (5), the top of the generating unit (1), the bottom of the condensation cooling unit (2), the bottom of the low-pressure evaporation absorption unit (3) and the top of the medium-pressure evaporation absorption unit (4) are all provided with a support (11), the support (11) of the condensation cooling unit (2) is detachably connected with the support (11) of the generating unit (1), and the support (11) of the low-pressure evaporation absorption unit (3) is detachably connected with the support (11) of the medium-pressure evaporation absorption unit (4).

4. The industrial off-gas stepwise cooling and separation apparatus according to claim 2, characterized in that: The cooling cavity (202) is located above the condensation cavity (201), the low-pressure evaporation cavity (301) and the low-pressure absorption cavity (302) are horizontally symmetrically arranged, and the medium-pressure evaporation cavity (401) and the medium-pressure absorption cavity (402) are horizontally symmetrically arranged.

5. The industrial off-gas stepwise cooling and separation apparatus according to claim 2, characterized in that: The first partition plate comprises a second partition plate (303) arranged in the third shell (305) and a first partition plate (309) arranged in the third pipe box (306), the second partition plate (303) is provided with a first through hole, and the first through hole is provided with a first liquid blocking plate (304); The second partition plate comprises a third partition plate (403) arranged in the fourth shell (405) and a second partition plate (408) arranged in the fourth pipe box (406), the third partition plate (403) is provided with a second through hole, and the second through hole is provided with a second liquid blocking plate (404).

6. The industrial off-gas stepwise cooling and separating apparatus according to claim 2, characterized in that: The fourth pipe box (406) of the medium-pressure evaporation cavity (401) is provided with two blocking plates (409), so as to divide the inner cavity of the fourth pipe box (406) into three cavities which are isolated from each other.

7. The industrial off-gas stepwise cooling and separation apparatus according to claim 2, characterized in that: The second shell (203) of the cooling cavity (202) is provided with a baffle (206).

8. The industrial off-gas stepwise cooling and separation apparatus according to claim 2, characterized in that: The first shell (101) of the generating unit (1), the third shell (305) of the low-pressure evaporation cavity (301), the third shell (305) of the low-pressure absorption cavity (302), the fourth shell (405) of the medium-pressure evaporation cavity (401) and the fourth shell (405) of the medium-pressure absorption cavity (402) are all provided with a spraying assembly (12).

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