Hydrolysis desulfurization tower for industrial waste gas treatment

Abstract

The utility model discloses a hydrolysis desulfurization tower for industrial waste gas treatment, which comprises a hydrolysis desulfurization tower, the hydrolysis desulfurization tower is provided with a water tank, a circulating pump, a circulating pipeline, a waste gas inlet, a manhole door, a spraying pipeline, a demisting layer and a tail gas port, and water in the water tank is conveyed to the spraying pipeline through the circulating pump and the circulating pipeline to be sprayed downwards. Tail gas enters through the waste gas inlet and is hydrolyzed through spraying water, a partition plate is arranged between the spraying pipeline and the demisting layer, and the hydrolysis desulfurization tower is connected with a pressure reduction pipeline located at the bottom of the partition plate. According to the hydrolysis desulfurization tower for industrial waste gas treatment, water collection is accelerated through advanced pressure reduction and cooling, fog drops are weighted by water molecules, the fog drops are separated after entering the bottom of the heat exchanger, then condensate water is conveyed to the water tank through the condensate pipeline, and the fog drops enter the demisting layer for secondary separation after being subjected to primary separation, so that the demisting efficiency is improved; scaling, blocking and damage risks of the demisting layer are reduced, the maintenance frequency is reduced, and the heat exchanger can be cleaned regularly.

Description

TECHNICAL FIELD

[0001] The utility model relates to an industrial waste gas treatment technical field, specifically is a hydrolysis desulfurization tower for industrial waste gas treatment. BACKGROUND

[0002] Hydrolysis desulfurization is mainly aimed at the removal of organic sulfur (such as COS) in coal gas, and its principle mainly involves hydrolysis reaction and subsequent possible further desulfurization reaction, in the hydrolysis desulfurization tower, under the action of certain temperature, pressure and catalyst, the organic sulfur (taking COS as an example) in coal gas occurs hydrolysis reaction with water, and the reaction equation is: COS+H2O H2S+CO2, this reaction is a reversible reaction, by controlling suitable reaction conditions, the reaction proceeds in the direction of generating H2S and CO2, so as to convert the organic sulfur COS in coal gas into inorganic sulfur H2S.

[0003] Under the action of the catalyst in the hydrolysis tower, the carbonyl sulfur (COS) in the tail gas occurs hydrolysis reaction with the water vapor in the tail gas or additionally supplemented, and is converted into hydrogen sulfide (H2S) and carbon dioxide (CO2), the hydrolyzed tail gas passes through the pressure regulating valve group to reduce the pressure, so as to meet the pressure requirement of the subsequent process, and then enters the heat exchanger to reduce the temperature, so that the temperature of the coal gas meets the condition of the adsorption process.

[0004] A demisting layer is arranged in the hydrolysis desulfurization tower, the tail gas treated by the desulfurization tower is entrained with a large amount of slurry droplets, and the droplets contain sulfuric acid, sulfate, carbonate and sulfur dioxide, etc., the mist droplets form gypsum scale after entering the subsequent process, accelerate the corrosion of the equipment, therefore, the demisting layer is arranged for treatment, the wire mesh of the demisting layer cannot effectively achieve the demisting purpose, and the demisting layer is easy to scale, block and damage, the equipment needs to be stopped regularly, regular maintenance, and the operation is affected, in order to improve the demisting effect and the service life of the demisting equipment, the application is provided. TECHNICAL CONTENT

[0005] The utility model aims at providing a hydrolysis desulfurization tower for industrial waste gas treatment, so as to solve the problems in the background technology.

[0006] In order to achieve the above object, the utility model provides the following technical scheme:

[0007] The utility model relates to an industrial waste gas treatment hydrolysis desulfurization tower, including hydrolysis desulfurization tower, hydrolysis desulfurization tower is equipped with water tank, circulating pump, circulating pipeline, waste gas entrance, entry hole door, spray pipeline, demisting layer and tail gas outlet, the water in water tank is sent to the spray pipeline downward spray through circulating pump and circulating pipeline, the tail gas enters the hydrolysis through the spray water, the separation plate is arranged between the spray pipeline and demisting layer, the hydrolysis desulfurization tower is connected with one located at the separation plate bottom pressure reducing pipeline, the pressure reducing pipeline is communicated with tail gas return pipeline and pressure reducing valve through three -way valve, the other end of tail gas return pipeline is connected with waste gas entrance, the other end of pressure reducing valve is connected with heat exchanger, and the exhaust port of heat exchanger is communicated with the cavity between the separation plate and demisting layer of hydrolysis desulfurization tower through demisting pipeline.

[0008] As a further scheme of the utility model: the detection tank is arranged on the pressure reducing pipeline, and a fixed hydrogen sulfide detector is arranged in the detection tank to detect the hydrogen sulfide content.

[0009] As a further scheme of the utility model: the buffer tank is arranged between the three-way valve and the pressure reducing valve, and the top of the buffer tank is communicated with the pressure reducing valve through a pipeline.

[0010] As a further scheme of the utility model: the bottom of the heat exchanger is communicated with the water tank through a condensate pipeline, the bottom of the buffer tank is provided with a condensate branch pipeline communicated with the condensate pipeline, and valves are arranged on the condensate pipeline and the condensate branch pipeline.

[0011] As a further scheme of the utility model: the heat exchanger is provided with a refrigerant input pipeline and a refrigerant output pipeline.

[0012] As a further scheme of the utility model: the separation plate separates the hydrolysis desulfurization tower into two independent chambers, the tail gas in the bottom chamber of the separation plate can only be output through the pressure reducing pipeline and input into the bottom chamber of the separation plate through the demisting pipeline.

[0013] As a further scheme of the utility model: the bottom of the separation plate is provided with a downspout for sending mist droplet liquid to the water tank.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The industrial waste gas treatment hydrolysis desulfurization tower accelerates water collection by pre-depressurization and cooling, increases the weight of water molecules, separates the mist droplets after entering the bottom of the heat exchanger, sends the condensed water to the water tank through the condensate pipeline, separates the mist droplets for the second time in the demisting layer after the first separation, improves the demisting efficiency, reduces the risk of scaling, blocking and damage of the demisting layer, reduces the maintenance frequency, and can be cleaned regularly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of industrial waste gas treatment hydrolysis desulfurization tower structure diagram.

[0017] In the figure: 1, hydrolysis desulfurization tower; 2, water tank; 3, circulating pump; 4, circulating pipeline; 5, waste gas inlet; 6, into the hole door; 7, spray pipeline; 8, partition plate; 9, demisting layer; 10, tail gas outlet; 11, detection tank; 12, fixed hydrogen sulfide detector; 13, demisting pipeline; 14, pressure reducing pipeline; 15, buffer tank; 16, pressure reducing valve; 17, tail gas reflux pipeline; 18, condensate pipeline; 19, condensate branch pipe; 20, heat exchanger; 21, refrigerant input pipeline; 22, refrigerant output pipeline. DETAILED DESCRIPTION

[0018] Please refer to Figure 1 , the utility model discloses a kind of industrial waste gas treatment hydrolysis desulfurization tower in the embodiment, including hydrolysis desulfurization tower 1, hydrolysis desulfurization tower 1 is configured with water tank 2, circulating pump 3, circulating pipeline 4, waste gas inlet 5, into the hole door 6, spray pipeline 7, demisting layer 9 and tail gas outlet 10, water in water tank 2 is sent to spray pipeline 7 downward spray by circulating pump 3 and circulating pipeline 4, tail gas enters by waste gas inlet 5 and occurs hydrolysis after being sprayed, partition plate 8 is arranged between spray pipeline 7 and demisting layer 9, hydrolysis desulfurization tower 1 is connected with one located at the bottom of partition plate 8 Pressure reducing pipeline 14, pressure reducing pipeline 14 is communicated with tail gas reflux pipeline 17 and pressure reducing valve 16 by three-way valve respectively, the other end of tail gas reflux pipeline 17 is connected with waste gas inlet 5, the other end of pressure reducing valve 16 is connected with heat exchanger 20, and the exhaust port of heat exchanger 20 is communicated with the cavity between the partition plate 8 of hydrolysis desulfurization tower 1 and demisting layer 9 by demisting pipeline 13, the fog drop formed by hydrolysis and gas are reduced by pressure reducing valve 16 in the application, and are sent into heat exchanger 20 for heat exchange treatment, and the pressure reduction itself does not have demisting effect directly, but the pressure reduction process can indirectly affect the formation or dissipation of fog, when air pressure reduces, the ability of air to contain water vapor can increase, if water vapor content in air does not change at this time, water vapor in saturation or supersaturation state can become unsaturated, so that fog drop has the tendency of evaporation and dissipation, air expansion process usually causes temperature to reduce, that is, the adiabatic cooling phenomenon occurs, and further cooling is carried out, so that water molecules in tail gas steam are effectively removed, and are gathered into condensed water and discharged from the bottom of heat exchanger 20, thereby reducing the pressure operation pressure of demisting layer 9, reducing the scaling, blockage and damage of demisting layer, thereby prolonging the service life of equipment, and heat exchanger 20 can be provided with two by pipeline, and switching is used, switching to another use during the maintenance process of one of heat exchanger 20, so that the number of parking can be effectively reduced, and the continuity of production can be maintained.

[0019] In a preferred embodiment, a detection tank 11 is arranged on the pressure reduction pipeline 14, and a fixed hydrogen sulfide detector 12 is arranged in the detection tank 11 to detect the hydrogen sulfide content. After hydrolysis, the main product of the organic sulfur in the tail gas is hydrogen sulfide. The fixed hydrogen sulfide detector 12 and other equipment can be used to detect the hydrogen sulfide content in the hydrolyzed tail gas. If the hydrogen sulfide content in the coal gas is similar to the hydrogen sulfide content that should be generated by the complete hydrolysis of the theoretical organic sulfur, and there is no obvious change, it can be preliminarily judged that the organic sulfur has been completely hydrolyzed. For example, through accurate calculation and measurement, if 100 cubic meters of tail gas theoretically contains 10 moles of hydrogen sulfide after complete hydrolysis of the organic sulfur, the actual detection result is 9.8-10 moles, it can be considered that the hydrolysis is basically complete. The detection value can be used to control the reflux of the tail gas through the DCS or other control system. If the actual detection is much lower than the set value, the system automatically controls the reflux of the tail gas through the three-way valve.

[0020] In a preferred embodiment, a buffer tank 15 is arranged between the three-way valve and the pressure reduction valve 16. The top of the buffer tank 15 is communicated with the pressure reduction valve 16 through a pipeline. The buffer tank 15 has two functions. The first function is to preliminarily separate the condensed water generated when the temperature decreases during pressure reduction, so as to reduce the amount of condensed water entering the heat exchanger 20 and reduce the fouling in the heat exchanger 20. The second function is to stabilize the flow rate of the gas after pressure reduction. The buffer tank 15 can buffer the tail gas to pass through the heat exchanger 20 uniformly.

[0021] In a preferred embodiment, the bottom of the heat exchanger 20 is communicated with the water tank 2 through a condensed liquid pipeline 18. The bottom of the buffer tank 15 is provided with a condensed liquid branch pipeline 19 communicated with the condensed liquid pipeline 18. Valves are arranged on the condensed liquid pipeline 18 and the condensed liquid branch pipeline 19. The condensed water in the heat exchanger 20 and the buffer tank 15 is transported to the water tank 2 through the condensed liquid pipeline 18 and the condensed liquid branch pipeline 19. The gas in the buffer tank 15 and the heat exchanger 20 has a certain pressure. Therefore, the condensed water can be pushed into the water tank 2 through the pressure, and the accumulated liquid in the tank can also be blown out. After the gas passes into the water tank, the gas floats and can be treated by hydrolysis again because the water tank and the hydrolysis desulfurization tower 1 are communicated with each other.

[0022] In a preferred embodiment, the heat exchanger 20 is provided with a refrigerant input pipeline 21 and a refrigerant output pipeline 22. Industrial cooling water is generally circulated into the heat exchanger 20 to perform heat exchange work. The cooling water is sourced from a water cooling tower and is transmitted by a water pump.

[0023] In a preferred embodiment, the partition plate 8 divides the hydrodesulfurization tower 1 into two independent chambers, the tail gas in the bottom chamber of the partition plate 8 can only be output through the pressure reduction pipeline 14, the tail gas after being pressurized and cooled, most of the mist droplets of which have been separated, is input into the bottom chamber of the partition plate 8 through the mist removal pipeline 13, and then enters the mist removal layer 9 of the original hydrodesulfurization tower 1 for mist removal treatment, so that the mist removal efficiency is improved, the mist removal layer 9 is effectively protected, and the maintenance of the mist removal layer 9 is reduced.

[0024] In a preferred embodiment, the bottom of the partition plate 8 is provided with a downcomer 23 for sending the mist droplet liquid to the water tank 2, and the mist droplets separated by the mist removal layer 9 are collected and discharged to the water tank 2 through the downcomer 23.

[0025] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has different emphases. If the description of an individual embodiment is not exhaustive, the description of other embodiments can be referred to.

[0026] The above-described embodiments only express the implementation of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A hydrolysis desulfurization tower for industrial waste gas treatment, comprising a hydrolysis desulfurization tower (1) which is provided with a water tank (2), a circulating pump (3), a circulating pipeline (4), a waste gas inlet (5), an entry hole door (6), a spraying pipeline (7), a demisting layer (9) and a tail gas outlet (10), water in the water tank (2) is sent to the spraying pipeline (7) to be sprayed downward through the circulating pump (3) and the circulating pipeline (4), and tail gas enters to occur hydrolysis through the sprayed water through the waste gas inlet (5), characterized in that, The spray pipeline (7) is provided with a partition plate (8) between the demisting layer (9), the hydrolysis desulfurization tower (1) is connected with a pressure reducing pipeline (14) located at the bottom of the partition plate (8), the pressure reducing pipeline (14) is communicated with a tail gas backflow pipeline (17) and a pressure reducing valve (16) through a three-way valve, the other end of the tail gas backflow pipeline (17) is connected with the waste gas inlet (5), the other end of the pressure reducing valve (16) is connected with a heat exchanger (20), and the exhaust port of the heat exchanger (20) is communicated with the cavity between the partition plate (8) and the demisting layer (9) of the hydrolysis desulfurization tower (1) through a demisting pipeline (13).

2. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 1, characterized in that, The pressure reducing pipeline (14) is provided with a detection tank (11), and the detection tank (11) is provided with a fixed hydrogen sulfide detector (12) for detecting the hydrogen sulfide content.

3. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 1, characterized in that, The three-way valve is provided with a buffer tank (15) between the pressure reducing valve (16), and the top of the buffer tank (15) is communicated with the pressure reducing valve (16) through a pipeline.

4. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 3, characterized in that, The bottom of the heat exchanger (20) is communicated with the water tank (2) through a condensate pipeline (18), the bottom of the buffer tank (15) is provided with a condensate branch pipeline (19) communicated with the condensate pipeline (18), and the condensate pipeline (18) and the condensate branch pipeline (19) are provided with valves.

5. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 1, characterized in that, The heat exchanger (20) is provided with a refrigerant input pipeline (21) and a refrigerant output pipeline (22).

6. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 1, characterized in that, The partition plate (8) divides the hydrolysis desulfurization tower (1) into two independent cavities, and the tail gas in the bottom cavity of the partition plate (8) can only be output through the pressure reducing pipeline (14) and input into the bottom cavity of the partition plate (8) through the demisting pipeline (13).

7. The hydrolytic desulfurization tower for industrial waste gas treatment according to claim 1, characterized in that, The bottom of the partition plate (8) is provided with a downcomer (23) for sending mist droplet liquid to the water tank (2).

Images