CN112023698A - Desulfurizing liquid desorption cooling tower and working method thereof - Google Patents

Abstract

The invention discloses a desulfurizing liquid desorption cooling tower and a working method thereof, wherein the desulfurizing liquid desorption cooling tower comprises a body, a partition plate is arranged in the body, and the body is divided into a desorption chamber and a cooling chamber through the partition plate; a sieve plate is arranged in the desorption chamber, a separation wall is arranged at the top of the sieve plate, an exhaust channel is arranged at the top of the separation wall, a gas distribution chamber is formed between the bottom of the sieve plate and the separation plate, and the sieve plate and the separation wall form an annular flow channel; the cooling chamber is internally provided with a plurality of gas ejectors which are arranged at intervals in sequence, the output ends of the ejectors are communicated with the gas distribution chamber, the input end of the working fluid is communicated with the acid making tail gas channel, and the suction chamber is communicated with the cooling chamber. The invention uses steam and gas stripping generated by cooling acid-making tail gas and barren solution to desorb desulfurization rich liquor SO by means of sieve plate₂And the method for cooling the barren solution realizes the obvious improvement of SO₂Desorption efficiency, desorption rate and promotion of acid-making fresh gasSO₂Concentration, effective reduction of SO₂Heat consumption for desorption and desorption cost.

Description

A kind of desulfurization liquid desorption cooling tower and its working method

technical field

The invention relates to the technical field of environmental engineering and renewable desulfurization, in particular to a desulfurization liquid desorption cooling tower and a working method thereof.

Background technique

At present, the SO ₂ in the flue gas is removed and then desorbed into resources. There are many methods for the regeneration and recycling of the desulfurizer, but there are few examples of successful application _; Coal power plants, due to the lack of practical technology, have no precedent for lasting successful application.

At present, some desorption and desulfurization methods that use liquid as the desulfurization medium, SO ₂ removal requires a lower temperature of the lean liquid, and _desorption requires a higher temperature of the rich liquid. Cooling cycle; in addition, some of the available SO ₂ desorption technologies today generate a large amount of water vapor with SO ₂ desorption, and the water vapor can be condensed to obtain usable SO ₂ gas; rich liquid desorption, temperature rise, and desorption accompanying high vaporization heat consumption, One of the important reasons for restricting the application of these technologies is the cooling of lean liquid, the condensation of desorbed gas and steam to remove a lot of waste heat, and the large investment in equipment.

Existing disclosed stripping and desorption technology related to the present invention is "method for circulating nitrogen in desorption tower (CN 102274643 B)", although this method is combined with acid-making process, it is used as the desorption tower type of core equipment, One of the reasons why this method is not applied is that the structure and the specific desorption process flow are missing the content of the invention, and there are problems such as the low concentration of SO ₂ in the desorbed gas obtained under the high desorption rate.

The existing disclosed sieve plate column technology related to the present invention is "fine-pored sieve plate bubble column (CN104324587A)", which is suitable for gas-liquid reaction and absorption, washing and purification. Affected by the contradiction between absorption and desorption, the sieve plate technology, which is usually used in the field of gas absorption and purification, has not been developed and applied in the desorption of desulfurization and rich liquid SO ₂ .

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a desulfurization liquid desorption cooling tower and its working method, in order to solve the problems existing in the above-mentioned prior art, to achieve significant improvement of SO2 desorption efficiency, desorption rate and improvement of _acid production fresh gas _SO2 concentration, effectively reduce _The target of SO2 desorption heat consumption and desorption cost.

In order to achieve the above purpose, the present invention provides the following solutions: the present invention provides a desulfurization liquid desorption cooling tower, comprising a body, a partition plate is arranged in the body, and the body is divided into a desorption chamber and a cooling chamber by the partition plate;

The desorption chamber is provided with a sieve plate, the top of the sieve plate is provided with a partition wall, the top of the partition wall is provided with an exhaust channel, and an air 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 with a rich liquid chamber, the rich liquid chamber is connected with a rich liquid channel, and the tail end of the annular channel is connected with a vertical overflow weir with a round mouth Tube;

The cooling chamber is provided with a number of gas injectors arranged in sequence at intervals, the output end of the gas injector penetrates the partition plate and communicates with the gas distribution chamber, and the input end of the gas injector is connected with an acid-making device. The exhaust gas channel, the suction chamber of the gas injector is communicated with the cooling chamber, the bottom of the gas injector is provided with a liquid distribution pipe, and the end of the round overflow weir vertical pipe away from the annular channel extends out of the baffle and is connected with the exhaust gas channel. The liquid distribution pipeline is communicated, the bottom of the liquid distribution pipeline is provided with a water spray filler, the bottom of the water spray filler is provided with a liquid storage chamber, and the liquid storage chamber is connected with a lean liquid channel.

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

Preferably, the top of the partition wall is provided with a first mist eliminator, and the exhaust passage is located on the top of the first mist eliminator.

Preferably, the bottom end of the gas distribution chamber is communicated with a U-shaped drainage channel, and the U-shaped drainage channel extends out of the partition and communicates with the cooling chamber.

Preferably, a second mist eliminator is arranged between the liquid distribution pipeline and the gas injector, and the circular overflow weir vertical pipe runs through the second mist eliminator.

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

Preferably, the partition wall is a plate-type structure with sidewalls arranged in a spiral line.

Preferably, the annular flow channel is a helical flow channel.

A kind of working method of desulfurization liquid desorption cooling tower, and its concrete steps are:

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

b. The desulfurized rich liquid entering the rich liquid chamber enters the annular flow channel after decelerating, and flows to its tail end along the annular flow channel at the set depth and flow rate;

c. The acid-making tail gas entering the set pressure of the gas injector is jetted at a high speed by the gas injector, and the water vapor sucked into the cooling chamber of the gas injector enters the gas distribution chamber after being mixed in the diffusion chamber of the gas injector, and then passes through The sieve plate enters the desulfurization rich liquid flowing in the annular flow channel to form bubbles, and a large number of bubbles collapse from bottom to top to the liquid surface, so that SO ₂ in the rich liquid is desorbed;

d. The desorbed lean liquid flowing to the end of the annular flow channel overflows into the round-mouth overflow weir vertical pipe, and enters the liquid distribution pipeline under the action of gravity. After cooling to the set liquid temperature, it is collected in the liquid storage chamber, and sent to the desulfurization system through the lean liquid channel for the next desulfurization cycle;

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

f. The mixed gas of nitrogen, water vapor and SO ₂ formed by the desorption of SO ₂ in the desorption chamber is sent to the condenser through the exhaust channel to remove the water vapor and becomes the fresh gas for acid production, and is sent to the sulfuric acid production system for acid production, and the newly generated part The acid-making tail gas repeats step a, enters the next desorption cycle, and the liquid leaking from the sieve plate into the gas distribution chamber is promptly discharged into the cooling chamber through the U-shaped drainage channel.

Preferably, before the water vapor in the step e enters the gas injector, and the mixed gas in the step f passes through the exhaust pipe, demisting treatment is performed.

The present invention discloses the following technical effects:

1. With the help of sieve plate, water spray packing and other components, the desulfurization rich liquid desorption and poor liquid cooling process are organically combined to form a simple structure and three-dimensional layout, which integrates the functions of rich liquid desorption and poor liquid cooling, and the process flow is simplified. The new desulfurization liquid desorption cooling tower. The tower body occupies a small area, the anti-corrosion problem is easy to solve, and the one-time investment is small.

2. The desorption method not only utilizes the heat energy and air stripping efficiency of the acid-making tail gas, but also utilizes the air stripping efficiency of water vapor generated by the evaporative cooling of the lean liquid, and at the same time promotes 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 SO ₂ stripping and desorption.

3. Compared with the conventional steam desorption and cavitation desorption SO ₂ devices and methods, the acid production tail gas belongs to dry gas. Compared with steam as the stripping medium, there is no vaporization heat consumption, and there is no exclusion of the gas as the stripping medium. Water vapor condensation exothermic problem. The water vapor generated by the cooling of the lean liquid is always condensed and recovered. This part of the water vapor is used to desorb SO ₂ by means of sieve plate air stripping and then condensed and recovered. Without adding additional cooling capacity, this part of the water vapor is given to the water vapor. The new function of extracting and desorbing SO ₂ saves the heat consumption of vaporization by their desorption. These features significantly reduce the investment and heat consumption of SO ₂ desorption equipment, and effectively reduce the cost of SO ₂ desorption.

4. Compared with the conventional nitrogen stripping and desorption method, the structure and process flow of the desorption tower are clear, practical and highly operable; the water vapor generated by the cooling of the lean liquid becomes the medium for stripping and desorbing SO ₂ , and the water vapor can be condensed and removed. Effectively increase the concentration of SO ₂ in the fresh air for acid production.

5. During the process of the annular flow channel, the desulfurized rich liquid is continuously subjected to the air intake of the bottom sieve plate to form bubbles. It does not require additional heat energy but has abundant bubbles, vigorous gas-liquid exchange, fast SO ₂ desorption rate and high desorption efficiency.

To sum up, the present invention provides a desulfurization solution for some desulfurization solutions, the reversible reaction characteristics of SO ₂ removal and desorption related to the liquid temperature, and the gas stripping and desorption characteristics of the gas flow through the sieve plate to form bubbles rising from the bottom of the rich liquid. The desorption cooling tower and its working method use the mixed gas formed by the acid-making tail gas and the water vapor produced by the cooling of the lean liquid as the medium, and with the help of the sieve plate, stripping and desorbing the desulfurization-rich liquid SO ₂ to produce the acid-making fresh gas, and using the acid-making process At the same time as the heat energy and stripping efficiency of the exhaust gas, the stripping efficiency of steam is generated by cooling the lean liquid, and the lean liquid is cooled. The goals of significantly improving SO ₂ desorption efficiency, desorption rate, increasing SO ₂ concentration in acid-making fresh gas, and effectively reducing SO ₂ desorption heat consumption and desorption cost are achieved.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the structural representation of the desulfurization liquid desorption cooling tower of the present invention;

Fig. 2 is A-A direction sectional view in Fig. 1;

Among them, 1 is the partition plate, 2 is the sieve plate, 3 is the partition wall, 4 is the annular flow channel, 5 is the rich liquid chamber, 6 is the liquid inlet overflow weir, 7 is the round overflow weir vertical pipe, and 8 is the first A mist eliminator, 9 is the gas distribution chamber, 10 is the rich liquid channel, 11 is the exhaust channel, 12 is the gas injector, 13 is the second mist eliminator, 14 is the liquid distribution pipeline, 15 is the water filling, 16 It is a liquid storage chamber, 17 is a U-shaped drainage channel, 18 is a lean liquid channel, and 19 is an acid-making tail gas channel.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

1-2, the present invention provides a desulfurization liquid desorption cooling tower, including a main body, a partition 1 is arranged in the main body, the main body is divided into a desorption chamber and a cooling chamber by the partition 1, and the above-mentioned main body is a desorption cooling The tower body is divided into upper and lower chambers by the partition plate 1, the upper chamber is a desorption chamber where the mixed gas is stripped and desorbed SO2 in the rich liquid by means of the sieve plate ₂ , and the lower chamber is a cooling chamber where the poor liquid is evaporated and cooled by the water-spraying packing 15;

The desorption chamber is provided with a sieve plate 2, which is divided into two upper and lower spaces by the sieve plate 2. The top of the sieve plate 2 is provided with a partition wall 3, and the partition wall 3 is located on the surface of the sieve plate 2 in the upper space. Taking the sieve plate 2 as the bottom, the partition wall 3 as the side wall, and an open channel annular flow channel 4 with an open top, the head end of the annular flow channel 4 is communicated with a rich liquid chamber 5, and a liquid inlet overflow is arranged between the two. Weir 6, the rich liquid chamber 5 is communicated with a rich liquid channel 10, and the rear end of the annular flow channel 4 is connected with a round-mouth overflow weir vertical pipe 7, and the desulfurized rich liquid entering the rich liquid chamber 5 is expanded and decelerated. The liquid overflow weir 6 enters the head end of the annular flow channel 4, flows to the tail end of the annular flow channel 4 with a set depth and flow rate, and overflows into the round mouth overflow weir vertical pipe 7, and the lower space of the desorption chamber is the acid-making tail gas and The water vapor mixed gas is distributed in the gas distribution chamber 9 at the bottom of the sieve plate 2, and the desorption chamber is externally connected with a rich liquid channel 10 that sends the desulfurized rich liquid into the rich liquid chamber 5 and an exhaust gas that sends the desorbed mixed gas to the subsequent process flow. Channel 11.

The cooling chamber is provided with a number of gas injectors 12 arranged in sequence at intervals. And fixed on the partition 1, the input end of the gas injector 12 is connected with the 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 communicated with the cooling chamber, the gas The bottom of the ejector 12 is provided with a liquid distribution pipeline 14, and one end of the round-mouth overflow weir vertical pipe 7 away from the annular channel 4 extends out of the partition 1 and communicates with the liquid distribution pipeline 14. The bottom is provided with a water spray packing 15, and the bottom of the water spray packing 15 is provided with a liquid storage chamber 16, the liquid storage chamber 16 is connected with a lean liquid channel 18, and the lean liquid channel 18 is connected to the outside. The high-pressure acid-making tail gas is jetted at a high speed by the nozzle of the gas injector 12, and the water vapor sucked into the cooling chamber of the gas injector 12 is mixed in the diffusion chamber of the gas injector 12 and then enters the gas distribution chamber 9 of the desorption chamber, The desulfurized rich liquid flowing into the annular flow channel 4 through the holes on the sieve plate 2 forms bubbles, and the bubbles collapse from bottom to top to the liquid level to desorb SO ₂ ; Under the action, it flows into the liquid distribution pipeline 14, and is evenly distributed on the water spray packing 15 by the many nozzles of the liquid distribution pipeline 14. After the lean liquid is evaporated and cooled, it is collected into the liquid storage chamber 16 at the bottom of the cooling chamber.

To further optimize the scheme, the top of the partition wall 3 is provided with a first mist eliminator 8, the exhaust channel 11 is located on the top of the first mist eliminator 8, and the nitrogen, water vapor and the desorption chamber SO ₂ are desorbed and formed. The SO ₂ mixed gas is discharged into the exhaust passage 11 after being defogged.

To further optimize the solution, the bottom end of the gas distribution chamber 9 is connected with a U-shaped drainage channel 17, the U-shaped drainage channel 17 extends out of the partition 1 and communicates with the cooling chamber, and the sieve plate 2 leaks into the air distribution chamber 9. The liquid is drained into the cooling chamber in time through the U-shaped drainage channel 17 .

In a further optimization scheme, a second mist eliminator 13 is provided between the liquid distribution pipeline 14 and the gas injector 12, and the circular overflow weir vertical pipe 7 runs through the second mist eliminator 13. In step e , the lean liquid that is sprayed on the surface of the water spray filler 15 and flows downward evaporates, and the generated water vapor flows upward under the suction of the gas ejector 12 , and is demisted by the second mist eliminator 13 before entering the gas ejector 12 deal with.

To further optimize the scheme, the liquid distribution pipeline 14 is provided with a plurality of nozzles, and the nozzles are arranged in sequence at intervals to achieve the premise that the lean liquid is evenly distributed in the water spray packing 15, and the desorbed lean liquid flowing to the end of the annular flow channel 4 should be desorbed. , the overflow enters the round mouth overflow weir vertical pipe 7, enters the liquid distribution pipeline 14 under the action of gravity, is sprayed on the water spray packing 15 by the nozzle on the liquid distribution pipeline 14, and the lean liquid evaporates and cools to the set liquid temperature. Liquid storage chamber 16.

To further optimize the scheme, the desorption cooling tower can be designed into various status quo. It is preferred that the cooling chamber be designed to be circular. The desorption chamber is arranged on the top of the cooling chamber through the partition plate 1, and the partition wall 3 is the side wall arranged in a spiral direction. It is recommended that the annular flow channel 4 be a flow channel with an Archimedes spiral of equal cross-section.

The suction and transportation of the water vapor generated in the cooling chamber can also be realized by the blower, the gas ejector 12 is cancelled, the acid-making tail gas channel 19 is connected with the top of the cooling chamber, the top of the cooling chamber is connected with the inlet of the blower, and the outlet of the blower is connected with the air duct In communication with the gas distribution chamber 9, a throttle valve is provided on the acid-making tail gas channel 19 to adjust the flow rate of the acid-making tail gas.

A kind of working method of desulfurization liquid desorption cooling tower, and its concrete steps are:

a. The desulfurization rich liquid from the desulfurization system that is heated to the set liquid temperature is sent to the rich liquid chamber 5 through the rich liquid channel 10; The channel 19 is fed into the gas injector 12;

b. The desulfurized rich liquid entering the rich liquid chamber 5 enters the annular flow channel 4 after decelerating, and flows along the annular flow channel 4 to its rear end at the set depth and flow rate;

c. The acid-making tail gas entering the set pressure of the gas injector 12 is jetted by the gas injector 12 at a high speed, and the water vapor sucked into the cooling chamber of the gas injector 12 is mixed in the diffusion chamber of the gas injector 12 and then enters the gas distribution chamber 9, then the desulfurization rich liquid flowing into the annular flow channel 4 through the sieve plate ₂ forms bubbles, and a large number of bubbles collapse from bottom to top to the liquid level, so that SO in the rich liquid is desorbed;

d. The desorbed depleted liquid flowing to the end of the annular flow channel 4 overflows into the round mouth overflow weir vertical pipe 7, and enters the liquid distribution pipe 14 under the action of gravity, and is evenly sprayed on the water-spraying filler by the nozzle set on the liquid distribution pipe 14. 15. After the lean liquid is evaporated and cooled 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 that is sprayed on the surface of the water spray filler 15 and flows 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 repeats step c; The pumping action of the ejector 12 makes the water vapor evaporated from the lean liquid on the surface of the water spray packing 15 be sucked away in time, maintaining the continuous evaporation, heat release and cooling of the lean liquid;

f. The mixed gas of nitrogen, water vapor and SO ₂ formed by the desorption of SO ₂ in the desorption chamber is sent to the condenser through the exhaust channel 11 to remove the water vapor to become acid production fresh gas, and sent to the sulfuric acid production system for acid production. Part of the acid-making tail gas repeats step a and enters the next desorption cycle, and 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 .

In order to avoid the oxidation of sulfite in the desorption process, it is necessary to limit the oxygen content of the acid production tail gas through the sulfuric acid production process.

In a further optimization scheme, before the water vapor in the step e enters the gas injector 12, and the mixed gas in the step f passes through the exhaust pipe 11, demisting treatment is performed.

Taking the alkaline aluminum sulfate solution as the desulfurization medium as an example, the working method of the desulfurization liquid desorption cooling tower as the desulfurization medium comprises the following steps:

a. The desulfurization rich liquid from the desulfurization system heated to a liquid temperature above 53°C is sent to the rich liquid chamber 5 through the rich liquid channel 10; The exhaust gas channel 19 is fed into the working fluid input end of the gas injector 12;

b. After the desulfurization rich liquid entering the rich liquid chamber 5 is decelerated, it enters the annular flow channel 4 through the liquid inlet overflow weir 6, and flows to its rear end along the annular flow channel 4 with a set depth and flow rate;

c. The acid-making tail gas entering the set pressure of the gas injector 12 is jetted at a high speed by the nozzle of the gas injector 12 and mixed with the water vapor that is sucked into the cooling chamber of the gas injector 12 and enters the desorption chamber in the diffusion chamber of the gas injector 12 The gas distribution chamber 9, then enters the desulfurization 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 level, so that SO in the rich liquid is desorbed;

d. The desorbed depleted liquid flowing to the end of the annular flow channel 4 overflows into the round-mouth overflow weir vertical pipe 7, and enters the liquid distribution pipeline 14 under the action of gravity. 15. After the lean liquid is evaporated and cooled to a liquid temperature below 49°C, it is collected in the liquid storage chamber 16 at the bottom of the cooling chamber, 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 spray filler 15 and flowing downward evaporates, and the generated water vapor flows upward to the second mist eliminator 13 under the pulling force of the gas ejector 12, and is sucked into the gas jet after demisting After the controller 12, the related process of step c is repeated. The pumping action of the gas ejector 12 makes the water vapor evaporated from the lean liquid on the surface of the water spray packing 15 be sucked away in time, maintaining the continuous evaporation, heat release and cooling of the lean liquid;

f. The mixed gas of nitrogen, water vapor and SO ₂ formed by the desorption of SO ₂ in the desorption chamber is demisted by the first demister 8, and sent to the condenser through the exhaust passage 11 to remove the water vapor to become the fresh gas for acid production, which is sent to To the sulfuric acid production system for acid production, the newly generated part of the acid production tail gas enters the next desorption cycle according to step a.

The liquid leaked from the sieve plate 2 into the air distribution chamber 9 is promptly discharged into the cooling chamber through the U-shaped drainage channel 17 .

Taking the 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 in the gas distribution chamber 9 involves the annular flow channel 4, the section width, process length, SO ₂ desorption rate, desorption efficiency, cooling chamber lean liquid cooling capacity, inlet pressure of exhaust passage 11 and many other parameters need to be comprehensively considered and optimized. The greater the depth of desulfurization and rich liquid in the annular flow channel 4, the greater the pressure loss of the desorption chamber; 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 desulfurized rich liquid from the inlet to the outlet of the annular flow channel 4 should be in the range of 100s ~ 300s.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or It is implied that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, but not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (10)

1. A desulfurizing liquid desorption cooling tower is characterized in that: the device comprises a body, wherein a partition plate (1) is arranged in the body, and the body is divided into a desorption chamber and a cooling chamber through the partition plate (1);

a sieve plate (2) is arranged in the desorption chamber, a separation wall (3) is arranged at the top of the sieve plate (2), an exhaust channel (11) is arranged at the top of the separation wall (3), a gas distribution chamber (9) is formed between the bottom of the sieve plate (2) and the separation plate (1), the sieve plate (2) and the separation wall (3) form an annular flow channel (4), the head end of the annular flow channel (4) is communicated with a liquid-rich chamber (5), the liquid-rich chamber (5) is communicated with a liquid-rich channel (10), and the tail end of the annular flow channel (4) is communicated with a round-mouth overflow weir vertical pipe (7);

the gas spraying device is characterized in that a plurality of gas sprayers (12) are arranged in the cooling chamber at intervals in sequence, the output ends of the gas sprayers (12) penetrate through the partition plate (1) and are communicated with the gas distribution chamber (9), the input ends of the gas sprayers (12) are communicated with an acid making tail gas channel (19), the suction chamber of the gas sprayers (12) is communicated with the cooling chamber, a liquid distribution pipeline (14) is arranged at the bottom of the gas sprayers (12), one end, far away from the annular channel (4), of the round-mouth overflow weir (7) extends out of the partition plate (1) and is communicated with the liquid distribution pipeline (14), water spraying fillers (15) are arranged at the bottom of the liquid distribution pipeline (14), a liquid storage chamber (16) is arranged at the bottom of the water spraying fillers (15), and a lean liquid channel (18) is communicated with the liquid storage.

2. The desulfurizing liquid desorption cooling tower according to claim 1, wherein: and a liquid inlet overflow weir (6) is arranged between the rich liquid chamber (5) and the head end of the annular flow channel (4).

3. The desulfurizing liquid desorption cooling tower according to claim 1, wherein: the top of the separation wall (3) is provided with a first demister (8), and the exhaust channel (11) is positioned at the top of the first demister (8).

4. The desulfurizing liquid desorption cooling tower according to claim 1, wherein: the bottom end of the air distribution chamber (9) is communicated with a U-shaped drainage channel (17), and the U-shaped drainage channel (17) extends out of the partition plate (1) and is communicated with the cooling chamber.

5. The desulfurizing liquid desorption cooling tower according to claim 1, wherein: and a second demister (13) is arranged between the liquid distribution pipeline (14) and the gas ejector (12), and a standpipe (7) of the round-mouth overflow weir penetrates through the second demister (13).

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

7. The desulfurizing liquid desorption cooling tower according to claim 1, wherein: the partition wall (3) is of a plate body type structure with the side wall arranged in a spiral line direction.

8. The desulfurizing liquid desorption cooling tower according to claim 7, wherein: the annular flow passage (4) is a spiral line-shaped flow passage.

9. A working method of a desulfurizing liquid desorption cooling tower is based on the desulfurizing liquid desorption cooling tower of claim 1, and comprises the following specific steps:

a. sending the desulfurization rich solution heated to a set solution temperature from a desulfurization system into a rich solution chamber (5) through a rich solution channel (10); meanwhile, acid making tail gas with set pressure from a sulfuric acid production system is sent to a gas ejector (12) through an acid making tail gas channel (19);

b. the desulfurization rich solution entering the rich solution chamber (5) enters the annular flow channel (4) after being decelerated, and flows to the tail end of the annular flow channel (4) along the set depth and flow rate;

c. the acid making tail gas with set pressure entering the gas ejector (12) is jetted at high speed by the gas ejector (12), mixed with water vapor in a cooling chamber sucked into the gas ejector (12) in a diffusion chamber of the gas ejector (12), enters the gas distribution chamber (9), enters the desulfurization rich liquid flowing in the annular flow channel (4) through the sieve plate (2) to form bubbles, and a large number of bubbles are collapsed from bottom to top to the liquid level to ensure that SO in the rich liquid is dissolved₂Desorption is obtained;

d. the desorbed barren solution flowing to the tail end of the annular flow channel (4) overflows into a vertical pipe (7) of a round-mouth overflow weir, enters a solution distribution pipeline (14) under the action of gravity, is sprayed on water spraying fillers (15) through a nozzle arranged on the solution distribution pipeline (14), is evaporated and cooled to a set solution temperature, is collected in a solution storage chamber (16), and is sent into a desulfurization system through a barren solution channel (18) to perform next desulfurization circulation;

e. c, evaporating the lean solution which is sprayed on the surface of the water spraying filler (15) and flows downwards, enabling the generated water vapor to flow upwards under the suction force of the gas ejector (12), and pumping the water vapor into the gas ejector (12) to repeat the step c;

f. desorption chamber SO₂Desorbing the formed nitrogen, water vapor and SO₂And c, the mixed gas is sent to a condenser through an exhaust channel (11) to remove water vapor to form acid making fresh gas, the acid making fresh gas is sent to a sulfuric acid production system to make acid, the newly generated part of acid making tail gas is repeatedly subjected to the step a and enters the next desorption cycle, and the liquid leaked into the gas distribution chamber (9) by the sieve plate (2) is timely discharged into the cooling chamber through a U-shaped drainage channel (17).

10. The method of operating a desulfurization solution-desorbing cooling tower according to claim 9, wherein: the water vapor in the step e is subjected to demisting treatment before entering a gas ejector (12) and the mixed gas in the step f is subjected to demisting treatment before passing through an exhaust pipeline (11).

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