CN211522133U

CN211522133U - Deamination device for purifying coke oven gas

Info

Publication number: CN211522133U
Application number: CN202020038390.2U
Authority: CN
Inventors: 程常华; 蔡志锋
Original assignee: Qujing Shengkai Coking Co ltd
Current assignee: Qujing Shengkai Coking Co ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-09-18
Anticipated expiration: 2030-01-09

Abstract

The utility model discloses a deamination device for purifying coke oven gas, which comprises a gas discharge pipe, an ammonia washing tower, a saturated crystallizer and a centrifugal machine, wherein a gas distributor, a plurality of spiral-flow plates, a packing layer, a liquid distributor and a demister are sequentially arranged in the ammonia washing tower from bottom to top; a partition plate in the saturated crystallizer divides an inner cavity of the shell into a liquid inlet cavity and a crystallization cavity, and a plurality of spray headers communicated with the liquid inlet cavity are uniformly arranged on the partition plate; gas outlet of coal gas delivery pipe is connected with dust pelletizing system, and through the intercommunication of first communicating pipe between dust pelletizing system and the ammonia washing tower, through second communicating pipe intercommunication between the liquid outlet of ammonia washing tower bottom and the feed liquor chamber, through third communicating pipe intercommunication between crystallization chamber and the centrifuge, centrifuge's crystal discharge pipe tip is provided with the desiccator, and the exit linkage of desiccator has the crystal holding tank. The device has the advantages of simple structural design, thorough deamination, capability of greatly improving the crystallization effect and capability of ensuring normal and stable production of the deamination process.

Description

Deamination device for purifying coke oven gas

Technical Field

The utility model belongs to the technical field of tail gas purification retrieves, concretely relates to coke oven gas purifies uses deamination device.

Background

Coke oven gas, which is a byproduct of the coking industry, is a combustible gas produced when products such as coke and tar are produced after several kinds of bituminous coal are prepared into coal for coking and subjected to high-temperature dry distillation in a coking furnace. The main components of the coke oven gas are water vapor, hydrogen, methane, tar gas, benzene vapor, naphthalene vapor, ammonia gas, carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen cyanide and other gases. Along with the improvement of the environmental protection requirement, the coke oven gas produced by the coke oven needs to be purified to remove various impurities such as hydrogen sulfide, hydrogen cyanide, ammonia, tar, naphthalene and the like, so that the coke oven gas reaches the national or industrial standard and is supplied to industrial or civil users for use; meanwhile, the impurities are recycled in the form of chemical byproducts. In the current coking process, most of nitrogen in coal enters coke oven gas in the form of ammonia gas, in the desulfurization process, after ammonia gas is used as an alkali source for desulfurization, excessive ammonia gas enters the subsequent process along with the coke oven gas, and the ammonia gas needs to be removed before the coke oven gas is supplied to industrial or civil users because the ammonia gas has certain toxicity, corrosivity and pungent odor. In the prior art, a saturator method is mostly adopted in the coke oven gas deamination process, namely, the coke oven gas is sent into a deamination tower, sulfuric acid is used for spraying and acid washing, the produced ammonium sulfate solution is evaporated and crystallized by a saturated evaporator, and ammonium sulfate generated by evaporation and crystallization is dried to prepare ammonium sulfate salt. The above device finds the following disadvantages during use due to its own structural design: the method has the advantages that firstly, in the process of countercurrent contact of the coke oven gas and the sulfuric acid solution, the contact area is small, so that the removal rate of ammonia in the coke oven gas is low; secondly, the existing saturated crystallizer can not ensure the stability of the crystallization temperature, the temperature fluctuation range of the crystallization of the sulfate solution is easy to cause to be larger, the crystallization rate of the ammonium sulfate is lower, the normal and stable production of the whole deamination procedure can not be ensured, and the production efficiency is seriously influenced. Therefore, it is objectively needed to develop a deamination device for purifying coke oven gas, which has simple structural design and thorough deamination, can greatly improve the crystallization effect and ensure the normal and stable production of a deamination process.

Disclosure of Invention

An object of the utility model is to provide a coke oven gas purifies uses deamination device that structural design is simple, the deamination is thorough, can by a wide margin improve crystallization effect, can guarantee the normal stable production of deamination process again.

The utility model aims at realizing the purposes, which comprises a gas discharge pipe, an ammonia washing tower, a saturated crystallizer and a centrifugal machine, wherein a gas distributor, a plurality of spiral-flow plates, a packing layer, a liquid distributor and a demister are sequentially arranged in the ammonia washing tower from bottom to top; the saturated crystallizer comprises a shell, a partition board is arranged in the shell and divides an inner cavity of the shell into a liquid inlet cavity and a crystallization cavity, a plurality of spray headers communicated with the liquid inlet cavity are uniformly arranged on the partition board, liquid outlets of the spray headers face the crystallization cavity, a heating plate is arranged in the crystallization cavity, a gap is reserved between the end part of the heating plate and the shell, the heating plate is of a hollow structure, a steam inlet pipe is arranged on one side of the heating plate, and a steam outlet pipe is arranged on the other side of the heating plate; gas discharge pipe's gas outlet is connected with dust pelletizing system, dust pelletizing system and wash the intercommunication through first communicating pipe between the ammonia tower, the gas outlet of first communicating pipe is located gas distributor's below, wash and pass through second communicating pipe intercommunication between the liquid outlet of ammonia tower bottom and the feed liquor chamber, install first force (forcing) pump on the second communicating pipe, communicate through third communicating pipe between crystallization chamber and the centrifuge, install the second force (forcing) pump on the third communicating pipe, centrifuge's crystal discharge pipe tip is provided with the desiccator, the exit linkage of desiccator has the crystal holding tank.

Further, the centrifuge comprises an outer cylinder and an inner filter cylinder concentrically arranged in the outer cylinder, two ends of the outer cylinder and the inner filter cylinder are sealed through end plates, a spiral material guide plate is arranged in the inner filter cylinder, one end of the inner filter cylinder is provided with a transmission shaft, the transmission shaft penetrates through the outer cylinder and then is in transmission connection with a driving motor I, the other end of the inner filter cylinder is provided with a support frame, the support frame is rotatably arranged on the end plate of the outer cylinder, a bearing is arranged on the support frame, a liquid outlet end of a third communication pipe extends into the inner filter cylinder, the outer wall of the third communication pipe is in sliding fit with the inner ring of the bearing, a crystal discharge pipe is arranged on the inner filter cylinder far away from one end of the third communication pipe, a mother liquid outlet pipe and a material guide port are arranged on the outer cylinder, the crystal discharge pipe is positioned in the material guide port and in sliding fit, and a driving motor II is installed below the outer cylinder body, a gear is installed on an output shaft of the driving motor II, and the gear is meshed with the gear ring.

Furthermore, the gas distributor is a thick plate, a plurality of air holes are uniformly distributed on the thick plate, and the air holes are conical holes with small upper ends and large lower ends.

Further, a preheater is mounted on the second communicating pipe.

Furthermore, an electric heating wire is arranged in the heating plate.

Further, an ultrasonic generator is arranged in the crystallization cavity.

Furthermore, a vertical pipe with a downward outlet is arranged at the end part of the first communication pipe positioned in the ammonia washing tower.

Compared with the prior art, the device has the advantages that: firstly, by utilizing the principle of countercurrent contact of coke oven gas and sulfuric acid solution, gas distributors, a plurality of spiral-flow plates, a packing layer, a liquid distributor and a demister with different structures are arranged in an ammonia washing tower, the rising coke oven gas can be fully contacted with the downward sprayed sulfuric acid solution through the structural design, ammonia in the coke oven gas is completely absorbed by the sulfuric acid solution, the ammonia in the coke oven gas is removed more thoroughly, and the structure can greatly reduce the amount of sulfuric acid required by washing while ensuring better washing effect; secondly, in the saturated crystallizer, utilize the shower head to spray the deamination and obtain ammonium sulfate solution and spray in the crystallization chamber, utilize the hot plate to evaporate ammonia crystallization to spraying the sodium sulfate solution in the crystallization chamber for the crystal in the ammonium sulfate solution is constantly appeared, adopts the hot plate heating not only to be convenient for regulate and control the crystallization temperature in the crystallization chamber, moreover by a wide margin improvement with the area of contact of ammonium sulfate solution, shortened the time of crystallization, improved the crystallization rate of ammonium sulfate solution. To sum up, this device has that structural design is simple, the deamination is thorough, can by a wide margin improve the crystallization effect, can guarantee the normal stable advantage of producing of deamination process again, easily uses widely.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the centrifuge 6;

in the figure: 1-gas discharge pipe, 2-dust removal system, 3-ammonia washing tower, 31-gas distributor, 32-cyclone plate, 33-packing layer, 34-liquid distributor, 35-exhaust port, 36-demister, 4-preheater, 5-saturated crystallizer, 51-baffle, 52-spray header, 53-liquid inlet cavity, 54-steam inlet pipe, 55-crystallization cavity, 56-heating plate, 57-electric heating wire, 58-steam outlet pipe, 6-centrifuge, 61-outer cylinder, 62-inner filter cylinder, 63-spiral guide plate, 64-transmission shaft, 65-driving motor I, 66-guide port, 67-gear ring, 68-gear, 69-driving motor II, 610-support frame, 7-sulfuric acid solution tank, 8-liquid inlet pipe, 9-first communicating pipe, 10-second communicating pipe, 11-first pressure pump, 12-third communicating pipe, 13-second pressure pump, 14-crystal discharge pipe, 15-dryer, 16-crystal storage tank and 17-mother liquor outlet pipe.

Detailed Description

The following further describes the present invention with reference to the attached drawings, but the present invention is not limited in any way, and any changes or improvements based on the teaching of the present invention all belong to the protection scope of the present invention.

As shown in figures 1-2, the utility model comprises a gas discharge pipe 1, an ammonia washing tower 3, a saturated crystallizer 5 and a centrifuge 6,

the device is characterized in that a gas distributor 31, a plurality of spiral-flow plates 32, a packing layer 33, a liquid distributor 34 and a demister 36 are sequentially arranged in the ammonia washing tower 3 from bottom to top, the plurality of spiral-flow plates 32 are obliquely and downwards staggered in the ammonia washing tower 3, the gas distributor 31 can increase the diffusion uniformity of gas, so that ammonia in coke oven gas is removed more thoroughly, the plurality of spiral-flow plates 32 can increase the contact area of the coke oven gas and a sulfuric acid solution, prevent the coke oven gas from blocking the packing layer 33, reduce the pickling amount required by washing, the demister 36 can remove foam generated in the reaction process of the coke oven gas and the sulfuric acid solution, dry the washed coke oven gas, so that the discharge of the coke oven gas is more environment-friendly, a sulfuric acid solution tank 7 is arranged outside the ammonia washing tower 3, and the sulfuric acid solution tank 7 is communicated with the liquid distributor 34 through a liquid inlet pipe 8, the top of the ammonia washing tower 3 is provided with an exhaust port 35;

the saturated crystallizer 5 comprises a shell, a partition plate 51 is arranged in the shell, the partition plate 51 divides the inner cavity of the shell into a liquid inlet cavity 53 and a crystallization cavity 55, a plurality of spray headers 52 communicated with the liquid inlet cavity 53 are uniformly arranged on the partition plate 51, the liquid outlets of the spray headers 52 face the crystallization cavity 55, a heating plate 56 is arranged in the crystallization cavity 55, a gap is reserved between the end part of the heating plate 56 and the shell, the heating plate 56 is of a hollow structure, a steam inlet pipe 54 is arranged on one side of the heating plate 56, and a steam outlet pipe 58 is arranged on the other side of the heating plate 56;

the gas outlet of the coal gas discharge pipe 1 is connected with a dust removal system 2, the dust removal system 2 is communicated with the ammonia washing tower 3 through a first communicating pipe 9, the gas outlet of the first communicating pipe 9 is located below the gas distributor 31, a liquid outlet at the bottom of the ammonia washing tower 3 is communicated with a liquid inlet cavity 53 through a second communicating pipe 10, the second communicating pipe 10 is provided with a first pressure pump 11, a crystallization cavity 55 is communicated with the centrifuge 6 through a third communicating pipe 12, the third communicating pipe 12 is provided with a second pressure pump 13, the end part of a crystal discharge pipe 14 of the centrifuge 6 is provided with a dryer 15, and the outlet of the dryer 15 is connected with a crystal storage tank 16.

The working process of the device is as follows: coke oven gas generated in the coking process enters a dust removal system 2 through a gas discharge pipe 1, enters an ammonia washing tower 3 through a first communication pipe 9 after dust removal of the dust removal system 2, the coke oven gas entering the ammonia washing tower 3 rises through a gas distributor 31, sulfuric acid solution in a sulfuric acid solution tank 7 enters a liquid distributor 34 through a liquid inlet pipe 8 and is sprayed through the liquid distributor 34, the coke oven gas and the sulfuric acid solution are fully mixed and absorbed between a plurality of layers of spiral flow plates 32 and a packing layer 33, the deaminated coke oven gas is dried through a demister 36 and then is discharged from an exhaust port 35, ammonium sulfate solution obtained by deamination enters a liquid inlet cavity 53 through a second communication pipe 10 under the action of a first pressure pump 11, the ammonium sulfate solution is uniformly sprayed into a crystallization cavity 55 through a spray head 52 and enters the crystallization cavity 55, let in high temperature steam in to hot plate 56 through steam intake pipe 54, the realization heats the ammonium sulfate solution in the crystallization chamber 55 and heaies up, crystal in the ammonium sulfate solution after evaporating ammonia through hot plate 56 heating constantly precipitates, the ammonium sulfate crystal solution that constantly precipitates under the effect of second force (forcing) pump 13, enter into centrifuge 15 through third communicating pipe 12 in, behind centrifuge 15's centrifugal separation, the thiamine crystal that the separation obtained gets into desiccator 15 after dry, can obtain the thiamine product.

The centrifuge 6 can adopt a solid-liquid centrifugal separator, preferably, the centrifuge 6 includes an outer cylinder 61 and an inner filter cylinder 62 concentrically arranged inside the outer cylinder 61, two ends of the outer cylinder 61 and the inner filter cylinder 62 are sealed by end plates, a spiral material guide plate 63 is arranged in the inner filter cylinder 62, a transmission shaft 64 is installed at one end of the inner filter cylinder 62, the transmission shaft 64 penetrates out of the outer cylinder 61 and is in transmission connection with a driving motor I65, a support frame 610 is arranged at the other end of the inner filter cylinder 62, the support frame 610 is rotatably installed on the end plate of the outer cylinder 61, a bearing is installed on the support frame 610, a liquid outlet end of the third communicating pipe 12 extends into the inner filter cylinder 62, the outer wall of the third communicating pipe 12 is in sliding fit with the inner ring of the bearing, the crystal discharge pipe 14 is arranged on the inner filter cylinder 62 far away from one end of the third communicating pipe 12, a mother liquid outlet pipe 17 and a material guide port, the crystal discharge pipe 14 is positioned in the material guide port 66 and is in sliding fit with the material guide port 66, the outer wall of the outer cylinder body 61 is provided with a gear ring 67, the lower part of the outer cylinder body 61 is provided with a driving motor II 69, the output shaft of the driving motor II 69 is provided with a gear 68, the gear 68 is meshed with the gear ring 67, when in use, the driving motor II 69 drives the gear 68 to rotate, the gear 68 drives the gear ring 67 to rotate, the outer cylinder body 61 is further driven to rotate, meanwhile, the driving motor I65 drives the inner filter cylinder 62 to rotate through the transmission shaft 64, the rotating directions and the rotating speeds of the inner filter cylinder 62 and the outer cylinder body 61 are the same, the crystallized ammonium sulfate solution enters the inner filter cylinder 62 through the second communicating pipe 10, the sulfuric acid mother liquor in the crystallized ammonium sulfate solution can be separated by utilizing the rotation of the inner filter cylinder 62, the separated mother liquor falls into the rotating outer cylinder body 61 and is discharged through the mother, the ammonium sulfate crystals staying in the inner filter cylinder 62 are discharged from the crystal discharge pipe 14 and the material guide port 66 into the dryer 15 by the action of the spiral guide plate 63.

Further, the coke oven gas entering the ammonia washing tower 3 is diffused more uniformly, the gas distributor 31 is a thick plate, a plurality of air holes are uniformly distributed on the thick plate, the air holes are conical holes with small upper ends and large lower ends,

in order to increase the temperature of the ammonium sulfate solution entering the crystallization saturator 5, the second communicating pipe 10 is provided with a preheater 4, and the preheater 4 can adopt a gas-liquid phase straight pipe heat exchanger used in the prior art.

In order to increase the crystallization speed and ensure the temperature of the crystallization to be constant, an electric heating wire 57 is arranged in the heating plate 56.

In order to improve the crystallization effect, an ultrasonic generator is installed in the crystallization cavity 55, and the ultrasonic generator can be an agitation type ultrasonic generator used in the prior art.

Preferably, a vertical pipe with a downward outlet is arranged at the end part of the first communication pipe 9 positioned in the ammonia washing tower 3, so that the direction of the gas flow of the coke oven gas into the ammonia removing tower 3 can be changed, and the coke oven gas is more fully contacted with the sulfuric acid solution.

Claims

1. The utility model provides a coke oven gas purifies uses deamination device, includes coal gas delivery pipe (1), washes ammonia tower (3), saturated crystallizer (5) and centrifuge (6), its characterized in that: the ammonia washing tower is characterized in that a gas distributor (31), a plurality of swirl plates (32), a packing layer (33), a liquid distributor (34) and a demister (36) are sequentially arranged in the ammonia washing tower (3) from bottom to top, the swirl plates (32) are obliquely and downwards staggered in the ammonia washing tower (3), a sulfuric acid solution tank (7) is arranged outside the ammonia washing tower (3), the sulfuric acid solution tank (7) is communicated with the liquid distributor (34) through a liquid inlet pipe (8), and an exhaust port (35) is arranged at the top of the ammonia washing tower (3); the saturated crystallizer (5) comprises a shell, a partition plate (51) is arranged in the shell, the partition plate (51) divides an inner cavity of the shell into a liquid inlet cavity (53) and a crystallization cavity (55), a plurality of spray headers (52) communicated with the liquid inlet cavity (53) are uniformly arranged on the partition plate (51), liquid outlets of the spray headers (52) face the crystallization cavity (55), a heating plate (56) is arranged in the crystallization cavity (55), a gap is reserved between the end part of the heating plate (56) and the shell, the heating plate (56) is of a hollow structure, a steam inlet pipe (54) is arranged on one side of the heating plate (56), and a steam outlet pipe (58) is arranged on the other side of the heating plate (56); the gas outlet of the coal gas discharge pipe (1) is connected with a dust removal system (2), the dust removal system (2) is communicated with the ammonia washing tower (3) through a first communicating pipe (9), the gas outlet of the first communicating pipe (9) is located below a gas distributor (31), a liquid outlet at the bottom of the ammonia washing tower (3) is communicated with a liquid inlet cavity (53) through a second communicating pipe (10), the second communicating pipe (10) is provided with a first pressure pump (11), the crystallization cavity (55) is communicated with the centrifuge (6) through a third communicating pipe (12), the third communicating pipe (12) is provided with a second pressure pump (13), the end part of a crystal discharge pipe (14) of the centrifuge (6) is provided with a dryer (15), and the outlet of the dryer (15) is connected with a crystal storage tank (16).

2. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: the centrifuge (6) comprises an outer cylinder body (61) and an inner filtering cylinder (62) concentrically arranged inside the outer cylinder body (61), the two ends of the outer cylinder body (61) and the inner filtering cylinder (62) are sealed through end plates, a spiral material guide plate (63) is arranged in the inner filtering cylinder (62), a transmission shaft (64) is installed at one end of the inner filtering cylinder (62), the transmission shaft (64) penetrates out of the outer cylinder body (61) and is in transmission connection with a driving motor I (65), a support frame (610) is arranged at the other end of the inner filtering cylinder (62), the support frame (610) is rotatably installed on the end plate of the outer cylinder body (61), a bearing is installed on the support frame (610), the liquid outlet end of a third communicating pipe (12) extends into the inner filtering cylinder (62), the outer wall of the third communicating pipe (12) is in sliding fit with the inner ring of the bearing, a crystal discharge pipe (14) is arranged on the inner filtering cylinder (62) far away from one end of the third communicating, be provided with mother liquor outlet pipe (17) and guide opening (66) on outer barrel (61), crystal discharge pipe (14) are located guide opening (66) in with guide opening (66) sliding fit, install ring gear (67) on the outer wall of outer barrel (61), driving motor II (69) are installed to the below of outer barrel (61), install gear (68) on the output shaft of driving motor II (69), gear (68) and ring gear (67) intermeshing.

3. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: the gas distributor (31) is a thick plate, a plurality of air holes are uniformly distributed on the thick plate, and the air holes are conical holes with small upper ends and large lower ends.

4. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: and a preheater (4) is installed on the second communicating pipe (10).

5. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: an electric heating wire (57) is arranged in the heating plate (56).

6. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: an ultrasonic generator is arranged in the crystallization cavity (55).

7. The deamination device for purifying coke oven gas as claimed in claim 1, wherein the deamination device comprises: a vertical pipe with a downward outlet is arranged at the end part of the first communicating pipe (9) positioned in the ammonia washing tower (3).