CN205730861U - A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility - Google Patents

A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility Download PDF

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Publication number
CN205730861U
CN205730861U CN201620670199.3U CN201620670199U CN205730861U CN 205730861 U CN205730861 U CN 205730861U CN 201620670199 U CN201620670199 U CN 201620670199U CN 205730861 U CN205730861 U CN 205730861U
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gas
coke oven
oxidation
desulfurization
spraying layer
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CN201620670199.3U
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郑勇
李云龙
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Tongxing environmental Polytron Technologies Inc
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ANHUI TONGXING ENVIRONMENTAL PROTECTION ENGINEERING CO LTD
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Abstract

The utility model discloses a kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility, the middle and lower part of desulfurizing tower arranges gas approach, arranges dividing plate in the lower section of gas approach, and the desulfurizing tower inner chamber below dividing plate is set to slurry pool;Being sequentially arranged above Venturi rod layer, concentrate spraying layer and gas-liquid demarcation strip of described gas approach;Gas-liquid demarcation strip be arranged over the first absorption spraying layer, second absorb spraying layer, tower top demister, the top of desulfurizing tower is exhanst gas outlet.The cooling that can be realized flue gas by this device is washed and SO2The removing of dust, reaches minimum discharge requirement, SO2Concentration is less than 30mg/Nm3, dust concentration is less than 15mg/Nm3;This utility model device can be applicable to be specifically designed for wet desulphurization (Ammonia Process, magnesium oxide method, the double alkali) technique of coke oven feature.

Description

A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility
Technical field:
This utility model relates to a kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility.
Background technology:
China is iron and steel big producing country and Coal Chemical Industry big producing country, and the existing coke oven of China more than 2000, due to coke oven tail gas Middle SO2Concentration is the highest, generally at 500mg/Nm3Hereinafter, " the coking chemistry emission of industrial pollutants issued for 2012 according to country Standard " GB16171 2012, cannot meet environmental requirement.
Existing wet desulfurizing process mainly has limestone-gypsum method, the built wet desulphurization device of major part mostly to adopt With limestone-gypsum method, all there is the secondary pollution problem of desulfurizing byproduct and the easy fouling of system equipment and blocking in this kind of technique Problem.
Most wet desulfurizing process oxidation concentrated slurries are all in same stock tank, and its oxidation effectiveness is typically due to slurry The reason that liquid is saturated is unsatisfactory (particularly Ammonia Process, magnesium oxide method), and the technique therefore using subregion oxidation to concentrate more may be used To improve desulfurization and the oxidation effectiveness of device.
Owing to country is increasingly tighter to the standard of coke oven tail gas discharge now, traditional wet sprinkling technique cannot expire Foot requirement (the 15mg/Nm to dust emission3), need to install wet electrical dust precipitator additional in tower outlet or quiet flue.Cost of investment, Operating cost is high, the unfavorable factor of fluctuation of service, therefore, special to traditional wet desulphurization (Ammonia Process, magnesium oxide method, double alkali) Technique is improved and perfect, to meet the tightest exhaust emissions environmental requirement.
Summary of the invention:
For overcoming the defect of prior art, the purpose of this utility model is to provide a kind of coke oven low-sulfur tail gas wet method desulfurization Subregion oxidation enrichment facility, the cooling that can be realized flue gas by this device is washed and SO2The removing of dust, reaches minimum discharge and wants Ask, SO2Concentration is less than 30mg/Nm3, dust concentration is less than 15mg/Nm3;Apparatus of the present invention can be applicable to be specifically designed for coke oven feature Wet desulphurization (Ammonia Process, magnesium oxide method, double alkali) technique.
This utility model solves technical problem and adopts the following technical scheme that
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility, the middle and lower part of desulfurizing tower arranges gas approach, Arranging dividing plate in the lower section of gas approach, the desulfurizing tower inner chamber below dividing plate is set to slurry pool;
Being sequentially arranged above Venturi rod layer, concentrate spraying layer and gas-liquid demarcation strip of described gas approach;
Gas-liquid demarcation strip be arranged over the first absorption spraying layer, second absorb spraying layer, tower top demister, desulfurizing tower Top be exhanst gas outlet.
Described slurry pool is divided into zoneofoxidation and non-oxide district, and the solution of described zoneofoxidation is undersaturated ammonium sulfate, The solution in non-oxide district is ammonium sulfite;The sprayed slurry of described first absorption spraying layer is from zoneofoxidation, and described second absorbs The sprayed slurry of spraying layer is from non-oxide district.
Being provided with oxidation pipe network in described zoneofoxidation, described oxidation pipe network forms with arm by being responsible for, and has oxygen bottom arm Changing air distribution hole, aperture is 6-10mm;Oxidation air pipeline outside supervisor's connection, by oxidation fan feed oxidation air.
Described gas-liquid dividing plate has reservoir and is located at the gas cap above reservoir, is formed and supply between reservoir and gas cap The passage that flue gas passes through from bottom to top;Sprayed slurry is fallen in reservoir by gas cap from top to bottom, and described reservoir is provided with overflow Mouthful.
The serosity that described overfall flows out separately flows into zoneofoxidation and non-oxide district by return duct.
It is provided with crystallization tank outside described desulfurizing tower and forms circulation with the serosity in desulfurizing tower, the entrance connection of described crystallization tank The zoneofoxidation of slurry pool and the overfall of dividing plate;The outlet of crystallization tank is provided with circulating pump, is pumped to serosity in crystallization tank concentrate Spraying layer.
Described crystallization tank is provided with agitator, the driving means outside crystallization tank drives.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
This device is specific to coke oven tail gas low-sulfur, the feature of low dust combines SO2, dust minimum discharge require and set Meter exploitation.
Arranging blood circulation in the middle part of desulfurizing tower, its core ground floor is concentration spraying layer and Venturi rod layer (or tower tray), It act as the dust removed in flue gas and the sulfur ammonium serosity carried secretly.
Desulfurization tower slurry pool is divided into zoneofoxidation and non-oxide district, and wherein the first sprayed slurry absorbing spraying layer carrys out autoxidation District, second absorbs the sprayed slurry serosity from non-oxide district of spraying layer (two-layer altogether), and its central role is by each spraying layer Effect be distinguished by, the main component in solution of zoneofoxidation is undersaturated ammonium sulfate, cooling for flue gas.Non- The main component in solution of zoneofoxidation is sulfurous acid, for absorbing the SO in flue gas2
Tower is outside equipped with crystallization tank and circulating pump, and the serosity that cooling concentrates is extracted from crystallization tank by circulating pump, passes through After pipeline delivers to spraying layer, high-temperature flue gas and slurry liquid contacts, temperature is lowered, and the moisture in serosity is evaporated, and serosity is by concentration. Be conducive to the energy-saving and environmental protection of device, and device is safer.
Accompanying drawing illustrates:
Fig. 1 is system pie graph of the present utility model;Fig. 2 is the enlarged drawing of gas-liquid dividing plate;In Fig. 2, arrow upwards is cigarette Air-flow is that serosity flows to, downward arrow.
Label in figure: 1-dividing plate, 2-Venturi rod layer, 3-concentrates spraying layer, 4-gas-liquid demarcation strip, 41-gas cap, and 42-overflows Head piece, 5-first absorbs spraying layer, and 6-second absorbs spraying layer, 7-tower top demister, 8-circulating pump, 9-crystallization tank, and 10-aoxidizes Air pipe network, 11-return duct, 12-absorbent recirculation pump, 13-slurry pool, 14-overflow pipe, 15-circulation pipe, 16-agitator, 17- Smoke inlet.
Below by way of detailed description of the invention, and the utility model is described in further detail to combine accompanying drawing.
Detailed description of the invention:
In order to make the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain This utility model, is not used to limit this utility model.
Embodiment: shown in Fig. 1, arranges gas approach 17 in the middle and lower part of desulfurizing tower, the lower section of gas approach arrange every Plate 1, the desulfurizing tower inner chamber below dividing plate is set to slurry pool 13;This slurry pool is divided into zoneofoxidation and non-oxide district, zoneofoxidation molten Liquid is undersaturated ammonium sulfate, and the solution in non-oxide district is ammonium sulfite.
In desulfurizing tower, being sequentially arranged above Venturi rod layer 2, concentrate spraying layer 3 and gas-liquid demarcation strip of gas approach 4;The first absorption spraying layer 5, second that is arranged at gas-liquid demarcation strip absorbs spraying layer 6 (two-layer altogether), tower top demister 7, The top of desulfurizing tower is exhanst gas outlet.
Shown in Fig. 1, the zoneofoxidation of slurry pool and non-oxide district have pipeline to be communicated to the first suction through absorbent recirculation pump 12 respectively Receive spraying layer 5 and second and absorb spraying layer 6.
The sprayed slurry of the i.e. first absorption spraying layer 5 is from zoneofoxidation, and second absorbs the sprayed slurry of spraying layer 6 from non- Zoneofoxidation.The main component in solution of zoneofoxidation is undersaturated ammonium sulfate, cooling for flue gas.Non-oxide district Main component in solution is sulfurous acid, for absorbing the SO in flue gas2
Being provided with oxidation pipe network in zoneofoxidation, this oxidation pipe network forms with arm by being responsible for, and has oxidation sky bottom arm Gas distribution hole, aperture is 6-10mm;Oxidation air pipeline 10 outside supervisor's connection, by oxidation fan feed oxidation air.
Shown in Fig. 2, gas-liquid dividing plate 4 has reservoir and is located at the gas cap 41 above reservoir, reservoir and gas cap it Between form the passage passed through from bottom to top for flue gas;Sprayed slurry is fallen in reservoir by gas cap from top to bottom, and reservoir is provided with Overfall 42, this overfall is provided with two return ducts 11 arranged side by side, flows to the zoneofoxidation of slurry pool and non-oxide district respectively.
It is provided with crystallization tank 9 outside desulfurizing tower and forms circulation with the serosity in desulfurizing tower, the entrance connection slurry pool of crystallization tank Zoneofoxidation and the overfall of dividing plate 1;The outlet of crystallization tank is provided with circulating pump 8, is pumped to serosity in crystallization tank concentrate spray Layer 3.Crystallization tank 9 is provided with agitator 16, the driving means outside crystallization tank drives, prevent serosity from precipitating.
In running, described below:
The high-temperature flue gas (160-170 DEG C) come from waste heat boiler enters desulfurization after intensified blower fan supercharging from tower middle and lower part Tower, after being fully contacted with the serosity concentrating spraying layer 3, lower the temperature, being cooled to 70 DEG C after dedusting and removing acidic materials, concentrates spray Layer 3 is made up of spray piping (FRP or steel alloy)+nozzle (carborundum), and sprinkle density is 6-12m3/m2.Concentrate spraying layer with Two-layer Venturi rod layer 2 (percent opening is 40-50%, and material is carbon steel+scale or rubber), beneficially flue gas is had between tower entrance Be uniformly distributed the removal with dust.There is dividing plate 1 to separate with absorption tower bottom oxide section slurry pool bottom enriching section, concentrate spray Layer 3 top have gas-liquid demarcation strip 4 to separate with absorbing spraying layer, and gas is entered by the gas passage of gas-liquid demarcation strip and absorbs spray District.
After flue gas contacts with concentration spray liquid, from bottom to top it is fully contacted with absorption spraying layer absorbing liquid, absorbs SO2And continue The continuous saturated wet flue gas cooling to about 50-55 DEG C, the SO in flue gas during this2Being absorbed by liquid absorption, flue gas continues It is cooled to saturated.Absorb spraying layer to be made up of spray piping (FRP or steel alloy)+nozzle (carborundum), the spray liquid of spraying layer Gas ratio is at 2-4L/m3Between.The solution of absorption spraying layer falls in the collecting tank of gas-liquid demarcation strip, then passes through back from overfall 42 Flow tube 11 flow by gravity is in the slurry pool of oxidation panel.
Continued up by demister layer through tower top smoke stack emission by the flue gas of uptake zone.After testing, smoke stack emission In flue gas, SO2Concentration is less than 30mg/Nm3, dust concentration is less than 15mg/Nm3, reach minimum discharge requirement.
Desulfurizing tower enriching section serosity is extracted from crystallization tank 9 by circulating pump 8, sends into through piping and concentrates spraying layer 3 (spray Layer be made up of with nozzle spray pipe network) atomization after contact with high-temperature flue gas, the serosity being concentrated falls on dividing plate 1, passes through overflow Pipe 14 flow by gravity continues cycling through to crystallization tank 9, for preventing serosity from precipitating, is provided with agitator 16 in crystallization tank.
The solution in desulfuration absorbing tower bottom slurry pond is respectively fed to three layers by absorbent recirculation pump 12 (two) and absorbs spray Pouring layer is atomized.Wherein, the serosity of zoneofoxidation delivers to the first absorption spraying layer 5, and the serosity in non-oxide district delivers to the second absorption spray Layer 6 (total upper and lower two-layer), compressed air is sent to the oxidation in desulfuration absorbing tower bottom slurry pond by oxidation air pipe network 10 In district, oxidation pipe network is evenly distributed in the cross section of slurry pool zoneofoxidation, makes the inferior sulfate radical in the solution of zoneofoxidation be oxidized to Sulfate radical.Fresh water (FW) required for system supplements by the technique water tank storage arranged and is pumped into each water by fresh water (FW) Point, to maintain the water balance of system.Circulation pipe 15 is had to be connected with crystallization tank 9 in the zoneofoxidation of tower bottom slurry pool, to ensure knot In brilliant groove 9, the liquid level of stock tank is in the range of setting.

Claims (7)

1. a coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility, the middle and lower part of desulfurizing tower arranges gas approach (17), it is characterised in that arrange dividing plate (1) in the lower section of gas approach, the desulfurizing tower inner chamber below dividing plate is set to slurry pool (13);
Being sequentially arranged above Venturi rod layer (2), concentrate spraying layer (3) and gas-liquid demarcation strip (4) of described gas approach;
Gas-liquid demarcation strip be arranged over the first absorption spraying layer (5), second absorb spraying layer (6), tower top demister (7), The top of desulfurizing tower is exhanst gas outlet.
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 1, it is characterised in that Described slurry pool is divided into zoneofoxidation and non-oxide district, and the solution of described zoneofoxidation is undersaturated ammonium sulfate, non-oxide district Solution be ammonium sulfite;The sprayed slurry of described first absorption spraying layer (5) is from zoneofoxidation, and described second absorbs spraying layer (6) sprayed slurry is from non-oxide district.
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 2, it is characterised in that Being provided with oxidation pipe network in described zoneofoxidation, described oxidation pipe network forms with arm by being responsible for, and has oxidation air and divide bottom arm Cloth hole, aperture is 6-10mm;Oxidation air pipeline (10) outside supervisor's connection, by oxidation fan feed oxidation air.
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 1, it is characterised in that Described gas-liquid dividing plate (4) has reservoir and is located at the gas cap (41) above reservoir, is formed and supply between reservoir and gas cap The passage that flue gas passes through from bottom to top;Sprayed slurry is fallen in reservoir by gas cap from top to bottom, and described reservoir is provided with overflow Mouth (42).
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 4, it is characterised in that The serosity that described overfall (42) flows out separately flows into zoneofoxidation and non-oxide district by return duct (11).
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 1, it is characterised in that It is provided with crystallization tank (9) outside described desulfurizing tower and forms circulation with the serosity in desulfurizing tower, the entrance connection serosity of described crystallization tank The zoneofoxidation in pond and the overfall of dividing plate (1);The outlet of crystallization tank is provided with circulating pump (8), is pumped to dense by serosity in crystallization tank Contracting spraying layer (3).
A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility the most according to claim 6, it is characterised in that Described crystallization tank (9) is provided with agitator (16), the driving means outside crystallization tank drives.
CN201620670199.3U 2016-06-27 2016-06-27 A kind of coke oven low-sulfur tail gas wet method desulfurization subregion oxidation enrichment facility Active CN205730861U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018214991A1 (en) * 2017-05-25 2018-11-29 Jiangnan Environmental Protection Group Inc. Ammonia-based desulfurization process and apparatus through ammonia-adding in different chambers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018214991A1 (en) * 2017-05-25 2018-11-29 Jiangnan Environmental Protection Group Inc. Ammonia-based desulfurization process and apparatus through ammonia-adding in different chambers

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Address after: 238100 Anhui city of Ma'anshan province Hanshan County Qingxi Town Industrial Park

Patentee after: Tongxing environmental Polytron Technologies Inc

Address before: 238100 Anhui city of Ma'anshan province Hanshan County Qingxi Town Industrial Park

Patentee before: Anhui Tongxing Environmental Protection Engineering Co.,Ltd.