A desulfurization liquid desorption cooling tower and working method thereof

Abstract

The present invention discloses a desulfurization liquid desorption cooling tower and a working method thereof, comprising a main body, a partition plate is arranged in the main body, and the main body is divided into a desorption chamber and a cooling chamber by the partition plate; a sieve plate is arranged in the desorption chamber, a partition wall is arranged on the top of the sieve plate, an exhaust channel is arranged on the top of the partition wall, a gas distribution chamber is formed between the bottom of the sieve plate and the partition plate, and the sieve plate and the partition wall form an annular flow channel; a plurality of gas injectors arranged in intervals are arranged in sequence in the cooling chamber, and their output ends are connected to the gas distribution chamber, the working fluid input ends are connected to the acid-making tail gas channel, and the suction chamber is connected to the cooling chamber. The present invention uses the sieve plate, the steam generated by the cooling of the acid-making tail gas and the lean liquid, and the gas stripping desorbs the desulfurized rich liquid SO2, and the lean liquid is cooled at the same time, so as to achieve the goal of significantly improving the SO2 desorption efficiency, desorption rate, and increasing the SO2 concentration of the acid-making new gas, and effectively reducing the heat consumption and desorption cost of SO2 desorption.

Description

Technical Field

[0001] The invention relates to the field of environmental engineering and renewable desulfurization technology, in particular to a desulfurization liquid desorption cooling tower and a working method thereof. Background Art

[0002] At present, there are many methods to remove SO2 from flue gas and then desorb it for resource recovery, and to regenerate and reuse desulfurizers, but there are few successful application examples; especially in coal-fired power plants with low flue gas SO2 concentration and huge exhaust volume, there is no precedent for long-term successful application due to the lack of practical technology.

[0003] At present, some desorption desulfurization methods using liquid as desulfurization medium have the problem that SO2 removal requires a low lean liquid temperature and desorption requires a high rich liquid temperature. The desulfurization solution needs to undergo a corresponding heating-cooling cycle along with the SO2 desorption-removal cycle process. In addition, some of the SO2 desorption technologies available today produce a large amount of water vapor along with SO2 desorption, and the water vapor must be condensed to obtain usable SO2 gas. The heating of the rich liquid desorption and the high vaporization heat consumption associated with desorption, the cooling of the lean liquid, the condensation of the desorption gas-producing steam to remove a large amount of waste heat, and the large equipment investment are one of the important reasons restricting the application of these technologies.

[0004] The currently disclosed gas lift desorption technology related to the present invention is "a method for circulating nitrogen in a desorption tower (CN 102274643 B)". Although this method is combined with the acid production process, the type, structure and specific desorption process flow of the desorption tower as the core equipment are missing from the invention content, and there are problems such as low SO2 concentration in the desorption gas obtained at a high desorption rate, which is one of the reasons why this method has not been applied.

[0005] The currently disclosed sieve plate tower technology related to the present invention is "fine-pore sieve plate bubbling tower (CN 104324587A)", which is suitable for gas-liquid reaction and absorption, washing and purification. Affected by the contradiction between absorption and desorption, the sieve plate technology usually used in the field of gas absorption and purification has not been developed and applied in the desorption of desulfurized rich liquid SO2. Summary of the invention

[0006] The purpose of the present invention is to provide a desulfurization liquid desorption cooling tower and a working method thereof, so as to solve the problems existing in the above-mentioned prior art and achieve the goal of significantly improving the SO2 desorption efficiency, desorption rate and SO2 concentration of the new acid production gas, and effectively reducing the SO2 desorption heat consumption and desorption cost.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides a desulfurized liquid desorption cooling tower, comprising a body, wherein a partition is provided in the body, and the body is divided into a desorption chamber and a cooling chamber by the partition;

[0008] The desorption chamber is provided with a sieve plate, a partition wall is provided on the top of the sieve plate, an exhaust channel is provided on the top of the partition wall, a gas distribution chamber is formed between the bottom of the sieve plate and the partition plate, the sieve plate and the partition wall form an annular flow channel, the head end of the annular flow channel is connected to a rich liquid chamber, the rich liquid chamber is connected to a rich liquid channel, and the tail end of the annular flow channel is connected to a circular overflow weir vertical pipe;

[0009] A plurality of gas injectors are arranged in an interval sequence in the cooling chamber, the output end of the gas injector passes through the partition and is connected to the gas distribution chamber, the input end of the gas injector is connected to the acid-making tail gas channel, the suction chamber of the gas injector is connected to the cooling chamber, a liquid distribution pipeline is provided at the bottom of the gas injector, one end of the circular overflow weir vertical pipe away from the annular flow channel extends out of the partition and is connected to the liquid distribution pipeline, a water sprinkling filler is provided at the bottom of the liquid distribution pipeline, a liquid storage chamber is provided at the bottom of the water sprinkling filler, and the liquid storage chamber is connected to the lean liquid channel.

[0010] Preferably, a liquid inlet overflow weir is provided between the rich liquid chamber and the head end of the annular flow channel.

[0011] Preferably, a first demister is provided on the top of the isolation wall, and the exhaust passage is located on the top of the first demister.

[0012] Preferably, the bottom end of the air distribution chamber is connected to a U-shaped drainage channel, and the U-shaped drainage channel extends out of the partition and is connected to the cooling chamber.

[0013] Preferably, a second demister is provided between the liquid distribution pipeline and the gas injector, and the circular overflow weir vertical pipe passes through the second demister.

[0014] Preferably, a plurality of nozzles are provided on the liquid distribution pipeline, and the nozzles are arranged in sequence at intervals and are arranged corresponding to the water spraying fillers.

[0015] Preferably, the isolation wall is a plate-type structure with side walls arranged in a spiral direction.

[0016] Preferably, the annular flow channel is a spiral flow channel.

[0017] A working method of a desulfurization liquid desorption cooling tower, the specific steps of which are:

[0018] a. The desulfurization rich liquid heated to the set liquid temperature from the desulfurization system is sent to the rich liquid chamber through the rich liquid channel; at the same time, the acid-making tail gas at the set pressure from the sulfuric acid production system is sent to the gas injector through the acid-making tail gas channel;

[0019] b. The desulfurized rich liquid entering the rich liquid chamber decelerates and enters the annular flow channel, and flows to its tail end along the annular flow channel at a set depth and flow rate;

[0020] c. The acid-making tail gas at the set pressure entering the gas injector is ejected at high speed by the gas injector, mixed with the water vapor in the cooling chamber sucked into the gas injector in the diffusion chamber of the gas injector, and then enters the gas distribution chamber, and then passes through the sieve plate into the desulfurized rich liquid flowing in the annular flow channel to form bubbles. A large number of bubbles collapse from bottom to top to the liquid surface, so that SO2 in the rich liquid is desorbed;

[0021] d. The desorbed lean liquid flowing to the tail end of the annular flow channel overflows into the vertical pipe of the circular overflow weir, enters the liquid distribution pipeline under the action of gravity, and is sprayed on the water-spraying filler by the nozzles provided on the liquid distribution pipeline. The lean liquid evaporates, cools to the set liquid temperature, and is collected in the liquid storage chamber, and is sent to the desulfurization system through the lean liquid channel for the next desulfurization cycle;

[0022] e. The lean liquid sprayed on the surface of the water-spraying filler and flowing downward evaporates, and the generated water vapor flows upward under the suction force of the gas ejector and is sucked into the gas ejector and then step c is repeated;

[0023] f. The nitrogen, water vapor and SO2 mixed gas formed by the desorption of SO2 in the desorption chamber are sent to the condenser through the exhaust channel to remove the water vapor to become new acid-making gas, and then sent to the sulfuric acid production system for acid production. The newly generated part of the acid-making tail gas repeats step a and enters the next desorption cycle. The liquid leaking from the sieve plate into the gas distribution chamber is discharged into the cooling chamber in time through the U-shaped drainage channel.

[0024] Preferably, the water vapor in step e is subjected to demisting treatment before entering the gas injector and the mixed gas in step f is subjected to demisting treatment before passing through the exhaust channel.

[0025] The present invention discloses the following technical effects:

[0026] 1. With the help of sieve plates, water-spraying fillers and other components, the desulfurization rich liquid desorption and lean liquid cooling process are organically combined to form a new desulfurization liquid desorption cooling tower with a simple structure, three-dimensional layout, rich liquid desorption and lean liquid cooling functions, and simplified process flow. The tower body occupies a small area, the anti-corrosion problem is easy to solve, and the one-time investment is small.

[0027] 2. The desorption method not only utilizes the thermal energy and gas lift efficiency of the acid production tail gas, but also utilizes the gas lift efficiency of the lean liquid evaporative cooling to produce water vapor, while promoting the continuous evaporation and cooling of the lean liquid; while achieving the purpose of evaporative cooling of the lean liquid, the generated water vapor is reused once in the SO2 gas lift desorption.

[0028] 3. Compared with conventional steam desorption and cavitation desorption SO2 devices and methods, the acid production tail gas is dry gas. Compared with water vapor as the gas stripping medium, there is no vaporization heat consumption, and there is no problem of condensation and heat release of water vapor as the gas stripping medium. The water vapor generated by the water cooling of the lean liquid must always be condensed and recovered. This part of the water vapor is used to desorb SO2 with the help of sieve plate gas stripping and then condensed and recovered. Without adding additional cooling capacity, this part of the water vapor is given a new function of gas stripping and desorbing SO2, saving the vaporization heat consumption of using them for desorption. These characteristics significantly reduce the investment and heat consumption of SO2 desorption equipment, and effectively reduce the cost of SO2 desorption.

[0029] 4. Compared with the conventional nitrogen gas stripping desorption method, the desorption tower structure and process flow are clear, practical and highly operational; since the water vapor generated by the cooling of the lean liquid becomes the medium for gas stripping desorption of SO2, the water vapor can be condensed and removed, effectively increasing the concentration of SO2 in the new acid-making gas.

[0030] 5. During the movement of the desulfurized rich liquid in the annular flow channel, air is continuously introduced through the holes of the bottom sieve plate to form bubbles. No additional heat energy is required, but the bubbles are abundant, the gas-liquid exchange is intense, the SO2 desorption rate is fast, and the desorption efficiency is high.

[0031] In summary, the present invention is aimed at certain desulfurization solutions, the reversible reaction characteristics of SO2 removal and desorption related to liquid temperature, and the gas lift desorption characteristics of bubbles rising from the bottom of the rich liquid formed by the airflow passing through the sieve plate, and provides a desulfurization liquid desorption cooling tower and working method, using the mixed gas formed by the water vapor generated by the acid production tail gas and the lean liquid water cooling as the medium, and with the help of the sieve plate, gas lift desorption of the desulfurized rich liquid SO2 to produce new acid production gas, while utilizing the heat energy and gas lift efficiency of the acid production tail gas, the gas lift efficiency of the lean liquid cooling to generate steam, and the lean liquid is cooled. The goal of significantly improving the SO2 desorption efficiency, desorption rate, and SO2 concentration of the new acid production gas, and effectively reducing the heat consumption and desorption cost of SO2 desorption is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a structural schematic diagram of the desulfurization liquid desorption cooling tower of the present invention;

[0034] Figure 2 for Figure 1 AA direction section view;

[0035] Among them, 1 is a partition, 2 is a sieve plate, 3 is a separation wall, 4 is an annular flow channel, 5 is a rich liquid chamber, 6 is a liquid inlet overflow weir, 7 is a circular overflow weir vertical pipe, 8 is a first demister, 9 is a gas distribution chamber, 10 is a rich liquid channel, 11 is an exhaust channel, 12 is a gas injector, 13 is a second demister, 14 is a liquid distribution pipeline, 15 is a water sprinkling filler, 16 is a liquid storage chamber, 17 is a U-shaped drainage channel, 18 is a lean liquid channel, and 19 is an acid production tail gas channel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figure 1-2 The present invention provides a desulfurized liquid desorption cooling tower, comprising a main body, wherein a partition 1 is arranged in the main body, wherein the main body is divided into a desorption chamber and a cooling chamber by the partition 1, wherein the main body is a desorption cooling tower body, and is divided into an upper chamber and an lower chamber by the partition 1, wherein the upper chamber is a desorption chamber in which a mixed gas is stripped and desorbed by a sieve plate 2 for desorption of SO2 in a rich liquid, and the lower chamber is a cooling chamber in which a lean liquid is evaporated and cooled by a water-spraying filler 15;

[0039] The desorption chamber is provided with a sieve plate 2, which is divided into two spaces, an upper space and an lower space. A partition wall 3 is provided on the top of the sieve plate 2. The partition wall 3 is located on the surface of the sieve plate 2 in the upper space. The two form an open channel annular flow channel 4 with the sieve plate 2 as the bottom, the partition wall 3 as the side wall, and the top open. The head end of the annular flow channel 4 is connected to a rich liquid chamber 5, and a liquid inlet overflow weir 6 is provided between the two. The rich liquid chamber 5 is connected to a rich liquid channel 10, and the tail end of the annular flow channel 4 is connected to a round overflow weir. The desulfurized rich liquid enters the rich liquid chamber 5 through the weir vertical pipe 7, and its expansion is slowed down. It enters the head end of the annular flow channel 4 through the liquid inlet overflow weir 6, flows to the tail end of the annular flow channel 4 with a set depth and flow rate, and overflows into the circular overflow weir vertical pipe 7. The lower space of the desorption chamber is a gas distribution chamber 9 in which the acid production tail gas and water vapor mixed gas are distributed at the bottom of the sieve plate 2. The desorption chamber is externally connected to a rich liquid channel 10 for sending the desulfurized rich liquid into the rich liquid chamber 5 and an exhaust channel 11 for sending the desorbed mixed gas to the subsequent process flow.

[0040] The cooling chamber is provided with a plurality of gas injectors 12 arranged in intervals and in sequence, the output end of the gas injector 12 passes through the partition 1 and is connected to the gas distribution chamber 9, the output end of the gas injector 12 passes through and is fixed on the partition 1, the input end of the gas injector 12 is connected to an acid-making tail gas channel 19, the acid-making tail gas channel 19 is connected to the outside, the suction chamber of the gas injector 12 is connected to the cooling chamber, the bottom of the gas injector 12 is provided with a liquid distribution pipeline 14, the end of the circular overflow weir vertical pipe 7 away from the annular flow channel 4 extends out of the partition 1 and is connected to the liquid distribution pipeline 14, the bottom of the liquid distribution pipeline 14 is provided with a water sprinkling filler 15, the bottom of the water sprinkling filler 15 is provided with a liquid storage chamber 16, the liquid storage chamber 16 is connected to a lean liquid channel 18, and the lean liquid channel 18 is connected to the outside. The acid-making tail gas with a relatively high pressure is ejected at a high speed from the nozzle of the gas injector 12, mixed with the cooling chamber water vapor sucked into the gas injector 12 in the diffusion chamber of the gas injector 12, and then enters the gas distribution chamber 9 of the desorption chamber, and enters the desulfurized rich liquid flowing in the annular flow channel 4 through the holes on the sieve plate 2 to form bubbles, and the bubbles collapse from bottom to top to the liquid surface to desorb SO2; the lean liquid entering the circular overflow weir vertical pipe 7 flows into the liquid distribution pipe 14 under the action of gravity, and is evenly distributed to the water sprinkling filler 15 by the numerous nozzles of the liquid distribution pipe 14. After the lean liquid evaporates and cools, it is collected in the liquid storage chamber 16 at the bottom of the cooling chamber.

[0041] According to a further optimization scheme, a first demister 8 is provided on the top of the isolation wall 3, and the exhaust passage 11 is located on the top of the first demister 8. The nitrogen, water vapor and SO2 mixed gas formed by the desorption of SO2 in the desorption chamber are discharged into the exhaust passage 11 after being demistered.

[0042] According to a further optimization scheme, the bottom end of the air distribution chamber 9 is connected to a U-shaped drainage channel 17, and the U-shaped drainage channel 17 extends out of the partition plate 1 and is connected to the cooling chamber. The liquid leaking from the sieve plate 2 into the air distribution chamber 9 is discharged into the cooling chamber in time through the U-shaped drainage channel 17.

[0043] A further optimized solution is that a second demister 13 is provided between the liquid distribution pipeline 14 and the gas injector 12, and the circular-mouth overflow weir vertical pipe 7 passes through the second demister 13. In step e, the lean liquid sprayed on the surface of the water spraying filler 15 and flowing downward evaporates, and the generated water vapor flows upward under the suction of the gas injector 12, and is defogged by the second demister 13 before entering the gas injector 12.

[0044] A further optimization scheme is that a plurality of nozzles are arranged on the liquid distribution pipe 14, and the nozzles are arranged in a sequential interval so as to achieve uniform distribution of the lean liquid on the water sprinkling filler 15. The desorbed lean liquid flowing to the tail end of the annular flow channel 4 overflows into the circular overflow weir vertical pipe 7, enters the liquid distribution pipe 14 under the action of gravity, and is sprayed on the water sprinkling filler 15 by the nozzles on the liquid distribution pipe 14. The lean liquid evaporates, cools to the set liquid temperature, and then collects in the liquid storage chamber 16.

[0045] According to a further optimization scheme, the desorption cooling tower can be designed into various states. It is preferred that the cooling chamber is designed to be circular, the desorption chamber is arranged on the top of the cooling chamber through a partition 1, the isolation wall 3 is a plate-type structure with a side wall arranged in a spiral direction, and it is preferred that the annular flow channel 4 is a flow channel with an Archimedean spiral direction of equal cross-section.

[0046] The suction and transportation of the water vapor generated in the cooling chamber can also be achieved by using a blower. The gas injector 12 is eliminated, and the acid-making tail gas channel 19 is connected to the top of the cooling chamber. The top of the cooling chamber is connected to the blower inlet by an air duct, and the blower outlet is connected to the gas distribution chamber 9 by an air duct. A throttle valve is set on the acid-making tail gas channel 19 to adjust the acid-making tail gas flow.

[0047] A working method of a desulfurization liquid desorption cooling tower, the specific steps of which are:

[0048] a. The desulfurized rich liquid heated to a set liquid temperature from the desulfurization system is sent to the rich liquid chamber 5 through the rich liquid channel 10; at the same time, the acid-making tail gas at a set pressure from the sulfuric acid production system is sent to the gas injector 12 through the acid-making tail gas channel 19;

[0049] b. The desulfurized rich liquid entering the rich liquid chamber 5 is decelerated and enters the annular flow channel 4, and flows along the annular flow channel 4 to its tail end at a set depth and flow rate;

[0050] c. The acid-making tail gas at the set pressure entering the gas injector 12 is ejected at high speed by the gas injector 12, mixed with the cooling chamber water vapor sucked into the gas injector 12 in the diffusion chamber of the gas injector 12, and then enters the gas distribution chamber 9, and then passes through the sieve plate 2 into the desulfurized rich liquid flowing in the annular flow channel 4 to form bubbles, and a large number of bubbles collapse from bottom to top to the liquid surface, so that SO2 in the rich liquid is desorbed;

[0051] d. The desorbed lean liquid flowing to the tail end of the annular flow channel 4 overflows into the circular overflow weir vertical pipe 7, enters the liquid distribution pipe 14 under the action of gravity, and is evenly sprayed on the water spraying filler 15 by the nozzles provided on the liquid distribution pipe 14. After the lean liquid evaporates and cools to the set liquid temperature, it is collected in the liquid storage chamber 16 and sent to the desulfurization system through the lean liquid channel 18 for the next desulfurization cycle;

[0052] e. The lean liquid sprayed on the surface of the water-spraying filler 15 and flowing downward evaporates, and the generated water vapor flows upward under the suction of the gas ejector 12, and is sucked into the gas ejector 12 and then step c is repeated; the suction of the gas ejector 12 causes the water vapor evaporated from the lean liquid on the surface of the water-spraying filler 15 to be sucked away in time, thereby maintaining the continuous evaporation, heat release and cooling of the lean liquid;

[0053] f. The nitrogen, water vapor and SO2 mixed gas formed by the desorption of SO2 in the desorption chamber are sent to the condenser through the exhaust channel 11 to remove the water vapor to become new acid-making gas, and then sent to the sulfuric acid production system for acid production. The newly generated part of the acid-making tail gas repeats step a and enters the next desorption cycle. The liquid leaking from the sieve plate 2 into the gas distribution chamber 9 is discharged into the cooling chamber in time through the U-shaped drainage channel 17.

[0054] In order to avoid the oxidation of sulfite in the desorption process, the oxygen content of the acid production tail gas needs to be limited through the sulfuric acid production process.

[0055] According to a further optimized solution, the water vapor in step e is subjected to a demisting treatment before entering the gas injector 12 and the mixed gas in step f is subjected to a demisting treatment before passing through the exhaust passage 11 .

[0056] Taking alkaline aluminum sulfate solution as a desulfurization medium as an example, the working method of the desulfurization liquid desorption cooling tower as the desulfurization medium includes the following steps:

[0057] a. The desulfurized rich liquid heated to a liquid temperature of 53°C or above from the desulfurization system is sent to the rich liquid chamber 5 through the rich liquid channel 10; at the same time, the acid-making tail gas of a set pressure from the sulfuric acid production system is sent to the working fluid input end of the gas injector 12 through the acid-making tail gas channel 19;

[0058] b. The desulfurized rich liquid entering the rich liquid chamber 5 is decelerated and enters the annular flow channel 4 through the inlet overflow weir 6, and flows along the annular flow channel 4 to its tail end at a set depth and flow rate;

[0059] c. The acid-making tail gas at the set pressure entering the gas injector 12 is ejected at high speed from the nozzle of the gas injector 12, mixed with the water vapor in the cooling chamber sucked into the gas injector 12 in the diffusion chamber of the gas injector 12, and enters the gas distribution chamber 9 of the desorption chamber, and then enters the desulfurized rich liquid flowing in the annular flow channel 4 through the holes on the sieve plate 2 to form bubbles, and a large number of bubbles collapse from bottom to top to the liquid surface, so that SO2 in the rich liquid is desorbed;

[0060] d. The desorbed lean liquid flowing to the tail end of the annular flow channel 4 overflows into the circular overflow weir vertical pipe 7, and enters the liquid distribution pipeline 14 under the action of gravity. The numerous nozzles provided in the liquid distribution pipeline 14 are evenly sprayed on the water spraying filler 15. The lean liquid evaporates and cools to a liquid temperature below 49°C, and then collects in the liquid storage chamber 16 at the bottom of the cooling chamber, and is sent to the desulfurization system through the lean liquid channel 18 for the next desulfurization cycle;

[0061] e. The lean liquid sprayed on the surface of the water-spraying filler 15 and flowing downward evaporates, and the generated water vapor flows upward to the second demister 13 under the suction of the gas ejector 12, and after defogger, it is sucked into the gas ejector 12 and the relevant process of step c is repeated. The suction of the gas ejector 12 allows the water vapor evaporated from the lean liquid on the surface of the water-spraying filler 15 to be sucked away in time, maintaining the continuous evaporation, heat release and cooling of the lean liquid;

[0062] f. The nitrogen, water vapor and SO2 mixed gas formed by the desorption of SO2 in the desorption chamber are defogged by the first demister 8 and sent to the condenser through the exhaust channel 11 to remove the water vapor to become the new acid-making gas, which is sent to the sulfuric acid production system for acid production. The newly generated part of the acid-making tail gas enters the next desorption cycle according to step a.

[0063] The liquid leaking from the sieve plate 2 into the gas distribution chamber 9 is promptly discharged into the cooling chamber through the U-shaped drainage channel 17 .

[0064] Taking alkaline aluminum sulfate solution as the desulfurization medium as an example, the determination of parameters such as the set depth and flow rate of the desulfurization rich liquid in the annular flow channel 4, the set pressure of the acid-making tail gas, and the mixed gas pressure of the gas distribution chamber 9 involves many parameters such as the cross-sectional width of the annular flow channel 4, the process length, the SO2 desorption rate, the desorption efficiency, the lean liquid cooling capacity of the cooling chamber, and the inlet pressure of the exhaust channel 11, which need to be comprehensively considered and optimized. The greater the depth of the desulfurization rich liquid in the annular flow channel 4, the greater the pressure loss in the desorption chamber; the lower the inlet pressure of the exhaust channel 11, the lower the mixed gas pressure requirement of the gas distribution chamber 9. The depth of the desulfurization rich liquid in the annular flow channel 4 should be in the range of 100~400mm, and the flow time of the desulfurization rich liquid from the inlet to the outlet of the annular flow channel 4 should be in the range of 100s~300s.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A desulfurization liquid desorption cooling tower, characterized in that: It comprises a main body, wherein a partition (1) is provided in the main body, and the main body is divided into a desorption chamber and a cooling chamber by the partition (1); A sieve plate (2) is provided in the desorption chamber, a partition wall (3) is provided on the top of the sieve plate (2), an exhaust passage (11) is provided on the top of the partition wall (3), a gas distribution chamber (9) is formed between the bottom of the sieve plate (2) and the partition plate (1), the sieve plate (2) and the partition wall (3) form an annular flow channel (4), the head end of the annular flow channel (4) is connected to a rich liquid chamber (5), the rich liquid chamber (5) is connected to a rich liquid passage (10), and the tail end of the annular flow channel (4) is connected to a circular overflow weir vertical pipe (7); A plurality of gas injectors (12) are arranged in a sequential arrangement at intervals in the cooling chamber. The output end of the gas injector (12) passes through the partition (1) and is in communication with the gas distribution chamber (9). The input end of the gas injector (12) is in communication with an acid-generating tail gas channel (19). The suction chamber of the gas injector (12) is in communication with the cooling chamber. A liquid distribution pipeline (14) is provided at the bottom of the gas injector (12). One end of the circular overflow weir vertical pipe (7) away from the annular flow channel (4) extends out of the partition (1) and is in communication with the liquid distribution pipeline (14). A water spraying filler (15) is provided at the bottom of the liquid distribution pipeline (14). A liquid storage chamber (16) is provided at the bottom of the water spraying filler (15). The liquid storage chamber (16) is in communication with a lean liquid channel (18). A liquid inlet overflow weir (6) is provided between the rich liquid chamber (5) and the head end of the annular flow channel (4); The bottom end of the air distribution chamber (9) is connected to a U-shaped drainage channel (17), and the U-shaped drainage channel (17) extends out of the partition plate (1) and is connected to the cooling chamber.

2. The desulfurized liquid desorption cooling tower according to claim 1, characterized in that: A first demister (8) is provided on the top of the isolation wall (3), and the exhaust passage (11) is located on the top of the first demister (8).

3. The desulfurized liquid desorption cooling tower according to claim 1, characterized in that: A second demister (13) is provided between the liquid distribution pipeline (14) and the gas injector (12), and the circular overflow weir vertical pipe (7) passes through the second demister (13).

4. The desulfurized liquid desorption cooling tower according to claim 1, characterized in that: The liquid distribution pipeline (14) is provided with a plurality of nozzles, which are arranged in sequence at intervals and are arranged corresponding to the water spraying fillers (15).

5. The desulfurized liquid desorption cooling tower according to claim 1, characterized in that: The isolation wall (3) is a plate-type structure with side walls arranged in a spiral direction.

6. The desulfurized liquid desorption cooling tower according to claim 5, characterized in that: The annular flow channel (4) is a flow channel in the form of a spiral line.

7. A method for operating a desulfurization liquid desorption cooling tower, based on the desulfurization liquid desorption cooling tower according to claim 1, wherein the specific steps are: a. The desulfurization rich liquid heated to a set liquid temperature from the desulfurization system is sent to the rich liquid chamber (5) through the rich liquid channel (10); at the same time, the acid production tail gas at a set pressure from the sulfuric acid production system is sent to the gas injector (12) through the acid production tail gas channel (19); b. The desulfurized rich liquid entering the rich liquid chamber (5) is decelerated and enters the annular flow channel (4), and flows along the annular flow channel (4) to its tail end at a set depth and flow rate; c. The acid-making tail gas at a set pressure entering the gas injector (12) is ejected at high speed by the gas injector (12), mixed with the cooling chamber water vapor sucked into the gas injector (12) in the diffusion chamber of the gas injector (12), and then enters the gas distribution chamber (9), and then passes through the sieve plate (2) into the desulfurized rich liquid flowing in the annular flow channel (4) to form bubbles. A large number of bubbles collapse from bottom to top to the liquid surface, so that SO2 in the rich liquid is desorbed; d. The desorbed lean liquid flowing to the tail end of the annular flow channel (4) overflows into the circular overflow weir vertical pipe (7), enters the liquid distribution pipe (14) under the action of gravity, and is sprayed on the water spraying filler (15) by the nozzles provided on the liquid distribution pipe (14). After the lean liquid evaporates and cools to the set liquid temperature, it is collected in the liquid storage chamber (16) and sent to the desulfurization system through the lean liquid channel (18) for the next desulfurization cycle; e. The lean liquid sprayed on the surface of the water-spraying filler (15) and flowing downward evaporates, and the generated water vapor flows upward under the suction force of the gas ejector (12) and is sucked into the gas ejector (12), and then step c is repeated; f. The nitrogen, water vapor and SO2 mixed gas formed by the desorption of SO2 in the desorption chamber are sent to the condenser through the exhaust passage (11) to remove the water vapor to become the new acid-making gas, and then sent to the sulfuric acid production system for acid production. The newly generated part of the acid-making tail gas repeats step a and enters the next desorption cycle. The liquid leaking from the sieve plate (2) into the gas distribution chamber (9) is promptly discharged into the cooling chamber through the U-shaped drainage channel (17).

8. The working method of the desulfurized liquid desorption cooling tower according to claim 7, characterized in that: The water vapor in step e is subjected to a demisting treatment before entering the gas injector (12), and the mixed gas in step f is subjected to a demisting treatment before passing through the exhaust passage (11).

Images