Vacuum flue gas desulfurization treatment device

Abstract

The embodiment of the utility model provides a vacuum flue gas desulfurization treatment device which comprises a water washing tank, the water washing tank is provided with a gas phase input end, a gas phase output end, a liquid phase input end and a liquid phase output end, the gas phase output end of the water washing tank is connected with a desulfurization reaction device, the desulfurization reaction device is provided with a gas phase output end, and the gas phase output end is connected with the liquid phase input end. The gas phase output end of the desulfurization reaction device is connected with a gas-liquid separation tank, and the gas-liquid separation tank is provided with a gas phase output end and a liquid phase output end. The vacuum flue gas desulfurization treatment device provided by the utility model can be used for carrying out desulfurization treatment on vacuum flue gas and reducing the content of hydrogen sulfide, then the vacuum flue gas can be fed into a tar tube furnace for combustion, and generated tail gas is further subjected to desulfurization and denitrification treatment and is discharged after reaching the standard. The vacuum flue gas desulfurization treatment device is low in investment, low in construction cost, capable of producing a byproduct sodium hydrosulfide product, free of hazardous waste, low in operation cost and high in economical efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flue gas desulfurization technical field especially relates to a vacuum flue gas desulfurization treatment device. BACKGROUND

[0002] The coal tar deep processing device mainly uses high-temperature coal tar as raw material, first carries out distillation processing in the tar distillation unit, produces light oil product, three mixed oil fraction, anthracene oil fraction and medium temperature pitch product, and the light oil is sold as product. After the three mixed oil fraction is washed by alkali to remove phenol, washed three mixed oil and sodium phenate are obtained, and the sodium phenate is sold as product. The washed three mixed oil is used as industrial naphthalene unit raw material, and is processed by industrial naphthalene distillation device to produce industrial naphthalene product, phenol oil product and washing oil product. The medium temperature pitch is processed by modified pitch device to produce modified pitch and flash oil product.

[0003] The modified pitch system will crack to produce a large amount of vacuum flue gas in the processing process, which contains a large amount of hydrogen sulfide. The vacuum flue gas has high heat value and can be used for combustion, but the SO2 index of the tail gas produced after combustion exceeds the standard.

[0004] For the vacuum flue gas desulfurization process of the tar device without upstream supporting coking device, if the vacuum flue gas is directly combusted, the tail gas after combustion is treated by desulfurization, because the SO2 concentration in the tail gas is high, the dry method and semi-dry method desulfurization process are used, and the tail gas index is difficult to meet the standard, and the wet desulfurization process needs to be used, but the operation cost is too high. If the hydrogen sulfide is treated first, the traditional Claus acid gas desulfurization method is selected, and the construction cost and operation cost are too high, which is not economical. UTILITY MODEL CONTENTS

[0005] In view of the above problems existing in the prior art, the purpose of the utility model embodiment is to provide a vacuum flue gas desulfurization treatment device.

[0006] The technical scheme adopted by the utility model embodiment is a vacuum flue gas desulfurization treatment device, which comprises a water washing tank, the water washing tank has a gas phase input end, a gas phase output end, a liquid phase input end and a liquid phase output end, the gas phase output end of the water washing tank is connected with a desulfurization reaction device, the desulfurization reaction device has a gas phase output end, and the gas phase output end of the desulfurization reaction device is connected with a gas-liquid separation tank, and the gas-liquid separation tank has a gas phase output end and a liquid phase output end.

[0007] Further, the desulfurization reaction device comprises an alkali solution supply device and a plurality of desulfurization reactors, and the alkali solution supply device is connected with the desulfurization reactors to supply alkali solution to the desulfurization reactors.

[0008] Further, the desulfurization reactors have gas phase input ends and gas phase output ends, all the gas phase input ends of the desulfurization reactors are connected with gas inlet pipelines, the gas inlet pipelines are connected with the gas phase output ends of the water washing tanks, all the gas phase output ends of the desulfurization reactors are connected with gas outlet pipelines, and the gas outlet pipelines are connected to the gas phase output ends of the desulfurization reaction devices to be connected to the gas-liquid separation tanks.

[0009] Further, the first valves are mounted on each of the gas inlet pipelines and the gas outlet pipelines, the series pipelines are arranged between the adjacent desulfurization reactors, one end of the series pipeline is connected to the gas phase input end of one desulfurization reactor, the other end of the series pipeline is connected to the gas phase output end of another desulfurization reactor, and the second valves are mounted on the series pipelines.

[0010] Further, the desulfurization reactors have liquid phase input ends and liquid phase output ends, the alkali liquid supply device comprises a circulating tank, a liquid supply pipeline is mounted on the circulating tank, the liquid supply pipeline is connected to the liquid phase input end of each desulfurization reactor, a liquid supply pump is mounted on the liquid supply pipeline, an alkali liquid input pipeline is connected to the circulating tank, the liquid phase output end of at least one desulfurization reactor is connected with a by-product outlet tank, the liquid phase output end of another desulfurization reactor is connected with a liquid return pipeline, and the liquid return pipeline is connected to the circulating tank.

[0011] Further, the gas phase input end of the water washing tank is connected with a flue gas pipeline, a vacuum pump and a Roots blower are mounted on the flue gas pipeline, and the Roots blower is located between the vacuum pump and the water washing tank on the flue gas pipeline.

[0012] Further, the liquid phase input end of the water washing tank is connected with a water supply pipeline, and the liquid phase output end of the water washing tank is connected with an oil-water separation tank.

[0013] Compared with the prior art, the vacuum flue gas desulfurization treatment device can perform desulfurization treatment on the vacuum flue gas, reduce the content of hydrogen sulfide, and then can be sent into a tar pipe furnace for combustion, tail gas generated by the combustion is further subjected to desulfurization and denitrification treatment, and is discharged after reaching the standard.

[0014] The vacuum flue gas desulfurization treatment device has the advantages of low investment, low construction cost, by-product sodium hydrosulfide product, no hazardous waste, low operation cost, and great economy.

[0015] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, rather than for limiting the present application.

[0016] The foregoing general description and the following detailed description of various implementations or examples of the technology described in the present application are not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the drawings, which are not necessarily drawn to scale, like numerals describe similar components throughout the several views. Like numerals having different letter extensions can represent different instances of the like component. The drawings illustrate generally, by way of example, various embodiments of the present application and are not intended to limit the present application in any way. The same or similar reference numerals and letters in different views represent the same or similar elements. Such embodiments do not represent all embodiments according to the present application. Rather, they are illustrative only as numerous other embodiments can be implemented using the same or similar systems, compositions, schemes, and methods.

[0018] Figure 1 The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below with reference to the drawings of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of the present application.

[0020] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meaning commonly understood by one of ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish one element from another, and are used for the purpose of description only. The terms "include" or "comprise" and similar terms are intended to mean that the elements or objects listed after the terms encompass the elements or objects recited therein and equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections or couplings, but can include electrical connections or couplings, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and can change accordingly when the absolute positions of the described objects change.

[0021] In order to keep the following description of the present application clear and concise, detailed descriptions of known functions and known components are omitted from the present application.

[0022] Reference is made to Figure 1The utility model embodiment provides a kind of vacuum flue gas desulfurization treatment device, including water washing jar 1, the water washing jar 1 has gas phase input end, gas phase output end, liquid phase input end and liquid phase output end, the gas phase output end of the water washing jar 1 is connected with desulfurization reaction device, the desulfurization reaction device has gas phase output end, the gas phase output end of the desulfurization reaction device is connected with gas-liquid separation tank 2, the gas-liquid separation tank 2 has gas phase output end and liquid phase output end.Washing jar 1 washes the trace ammonia contained in acidic gas, while the oil product entrained in vacuum flue gas is cooled, removed in water washing jar 1.Washing jar 1 replaces fresh water periodically.The technical scheme can carry out desulfurization treatment to vacuum flue gas, reduce hydrogen sulfide content, then can be sent into tar pipe furnace combustion, the tail gas generated is further desulfurized and denitrified, is discharged after reaching standard.The vacuum flue gas desulfurization treatment device is little in investment, low in construction cost, while by-product sodium sulfide product can be produced, no hazardous waste is generated, operating cost is lower, with greater economy.

[0023] The desulfurization reaction device includes alkali supply device and multiple desulfurization reactors 3, the alkali supply device is connected with the desulfurization reactor 3 to supply alkali to the desulfurization reactor 3.After deamination, gas passes through the desulfurization reactor 3 from bottom to top, and the production process of NaHS is to react with H2S to generate Na2S by taking NaOH solution as absorbent, and gradually produce NaHS with the continuous increase of H2S absorption.

[0024] Parallel connection mode of desulfurization reactor 3: the desulfurization reactor 3 has gas phase input end and gas phase output end, the gas phase input end of all the desulfurization reactors 3 is connected with gas inlet pipeline, the gas inlet pipeline is connected with the gas phase output end of water washing jar 1, the gas phase output end of all the desulfurization reactors 3 is connected with gas outlet pipeline, and the gas outlet pipeline is connected to the gas phase output end of the desulfurization reaction device to be connected to the gas-liquid separation tank 2.

[0025] Series connection mode of desulfurization reactor 3: the first valve 4 is installed on each gas inlet pipeline and each gas outlet pipeline, the series connection pipeline 5 is arranged between adjacent desulfurization reactors 3, one end of the series connection pipeline 5 is connected with the gas phase input end of one desulfurization reactor 3, the other end of the series connection pipeline 5 is connected with the gas phase output end of another desulfurization reactor 3, and the second valve 6 is installed on the series connection pipeline 5.By controlling each first valve 4 and second valve 6, the deamination gas passes through all the desulfurization reactors 3 from bottom to top in turn.

[0026] The desulfurization reactor 3 has a liquid phase input end and a liquid phase output end, the alkali supply device includes a circulating tank 7, a liquid supply pipeline is installed on the circulating tank 7, the liquid supply pipeline is connected to each desulfurization reactor 3 having a liquid phase input end, a liquid supply pump 8 is installed on the liquid supply pipeline, an alkali input pipeline 9 is connected to the circulating tank 7, at least one liquid phase output end of the desulfurization reactor 3 is connected to a by-product tank 10, and the liquid phase output end of another desulfurization reactor 3 is connected to a liquid return pipeline connected to the circulating tank 7. In use, the desulfurization reactor 3 is filled with a certain liquid level of NaOH solution, and Na2S is first generated as the reaction proceeds, and when NaOH is reacted, NaHS is continuously generated. The multi-stage desulfurization reactor 3 ensures that the vacuum flue gas desulfurization index is qualified, and when the NaHS index of the desulfurization reactor 3 connected to the by-product tank 10 is qualified, it is put into a NaHS product tank, and then the alkali supply device supplies alkali to continue the reaction.

[0027] The alkali supply device circulates the alkali in the desulfurization reactor 3 not connected to the by-product tank 10, and the alkali supply device supplies the circulated alkali to the desulfurization reactor 3 connected to the by-product tank 10.

[0028] The gas phase input end of the water washing tank 1 is connected to a flue gas pipeline, a vacuum pump 11 and a Roots blower 12 are installed on the flue gas pipeline, and the Roots blower 12 is located between the vacuum pump 11 and the water washing tank 1 on the flue gas pipeline. The vacuum flue gas is pressurized by the vacuum pump 11 and the Roots blower 12.

[0029] The liquid phase input end of the water washing tank 1 is connected to a water supply pipeline, and the liquid phase output end of the water washing tank 1 is connected to an oil-water separation tank 13. The oil-containing sewage exchanged by the water washing tank 1 is discharged to the oil-water separation tank 13 for separation, the oil is sent to a tar raw material tank, and the sewage is sent to a sewage treatment device for further treatment.

[0030] The H2S content of the vacuum flue gas after desulfurization by the device is less than 200 mg / Nm 3 , which can be sent to a tar pipe furnace as a supplemental fuel gas for combustion. The generated tail gas can be further desulfurized and denitrified to meet the emission standards.

[0031] And the consumption of alkali is small, the operation cost is low, sodium hydrosulfide can be by-produced, and there is a certain economic benefit, no dangerous waste is produced, and it is safe and environmentally friendly.

[0032] The above description is intended to be illustrative rather than restrictive, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more aspects thereof) can be used in combination with each other, and the embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A vacuum flue gas desulphurization treatment apparatus comprising a water wash tank (1), characterized in that, The water washing tank (1) has a gas phase input end, a gas phase output end, a liquid phase input end and a liquid phase output end, the gas phase output end of the water washing tank (1) is connected with a desulfurization reaction device, the desulfurization reaction device has a gas phase output end, the gas phase output end of the desulfurization reaction device is connected with a gas-liquid separation tank (2), the gas-liquid separation tank (2) has a gas phase output end and a liquid phase output end.

2. A vacuum flue gas desulphurization treatment device according to claim 1, characterized in that The desulfurization reaction device comprises an alkali liquor supply device and a plurality of desulfurization reactors (3), the alkali liquor supply device is connected with the desulfurization reactors (3) to supply alkali liquor to the desulfurization reactors (3).

3. A vacuum flue gas desulphurization treatment apparatus according to claim 2, characterized in that The desulfurization reactor (3) has a gas phase input end and a gas phase output end, the gas phase input end of all the desulfurization reactors (3) is connected with a gas inlet pipeline, the gas inlet pipeline is connected with the gas phase output end of the water washing tank (1), the gas phase output end of all the desulfurization reactors (3) is connected with a gas outlet pipeline, and the gas outlet pipelines are connected to form the gas phase output end of the desulfurization reaction device to be connected to the gas-liquid separation tank (2).

4. A vacuum flue gas desulphurization treatment apparatus according to claim 3, characterized in that A first valve (4) is installed on each of the gas inlet pipeline and the gas outlet pipeline, a series pipeline (5) is arranged between adjacent desulfurization reactors (3), one end of the series pipeline (5) is connected with the gas phase input end of one desulfurization reactor (3), the other end of the series pipeline (5) is connected with the gas phase output end of another desulfurization reactor (3), and a second valve (6) is installed on the series pipeline (5).

5. A vacuum flue gas desulphurization treatment apparatus according to claim 3 or 4, characterized in that The desulfurization reactor (3) has a liquid phase input end and a liquid phase output end, the alkali liquor supply device comprises a circulating tank (7), a liquid supply pipeline is installed on the circulating tank (7), the liquid supply pipeline is connected with the liquid phase input end of each desulfurization reactor (3), a liquid supply pump (8) is installed on the liquid supply pipeline, an alkali liquor input pipeline (9) is connected to the circulating tank (7), the liquid phase output end of at least one desulfurization reactor (3) is connected with a by-product outlet tank (10), the liquid phase output end of another desulfurization reactor (3) is connected with a liquid return pipeline, and the liquid return pipeline is connected to the circulating tank (7).

6. A vacuum flue gas desulphurization treatment device according to claim 1, characterized in that A flue gas pipeline is connected with the gas phase input end of the water washing tank (1), a vacuum pump (11) and a Roots blower (12) are installed on the flue gas pipeline, and the Roots blower (12) is located between the vacuum pump (11) and the water washing tank (1) on the flue gas pipeline.

7. A vacuum flue gas desulphurization treatment apparatus according to claim 1, characterized in that A water supply pipeline is connected with the liquid phase input end of the water washing tank (1), and an oil-water separation tank (13) is connected with the liquid phase output end of the water washing tank (1).

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