CN105779029A - Semi-coke tail gas desulphurization purifier - Google Patents
Semi-coke tail gas desulphurization purifier Download PDFInfo
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- CN105779029A CN105779029A CN201410784071.5A CN201410784071A CN105779029A CN 105779029 A CN105779029 A CN 105779029A CN 201410784071 A CN201410784071 A CN 201410784071A CN 105779029 A CN105779029 A CN 105779029A
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Abstract
A semi-coke tail gas desulphurization purifier designed in the invention is mainly composed of a semi-coke tail gas inlet main tube and a semi-coke tail gas outlet main tube, the semi-coke tail gas inlet main tube is provided with three semi-coke tail gas inlet branch tubes, the semi-coke tail gas outlet main tube is provided with three semi-coke tail gas outlet branch tubes, and three adsorption units are arranged between the semi-coke tail gas inlet main tube and the semi-coke tail gas outlet main tube through the semi-coke tail gas inlet branch tubes and the semi-coke tail gas outlet branch tubes; adsorbents in adsorption towers of the adsorption units are arranged in a layering manner, and different adsorbents are adopted according to different impurities, so the adsorption purifying efficiency is high; overheated steam is arranged at the bottom of each of the adsorption towers to make tar on the surface of the corresponding bottom layer adsorbent thaw and drip, and naphthalene can volatilize, so normal use of the subsequent adsorbents is ensured; and desulfurizers in the towers are oxidized and regenerated through opening emptying valves arranged at tower tops and regeneration valves arranged at tower bottoms and using natural convection of air, and the sulfur capacity of regenerated desulfurizers is improved by about 15%.
Description
Technical field
The present invention relates to tail of semi coke cleaning and recycle field, particularly a kind of for realizing high effect cleaning recovery tail of semi coke, reduce adsorbent replacing amount, improve the tail of semi coke desulfurization purifier of sorbent circulation utilization rate.
Background technology
Semi-coke is widely used in the industries such as ferroalloy, carbide, synthesis ammonia, is additionally operable to blast furnace blowing, makes the fields such as activated carbon, oil absorbent, denitrfying agent and domestic fuel.Semi-coke stove to produce a large amount of tail gas in producing semi-coke process, will produce about 700 cubes of tail gas, calorific value 1700-2000 kilocalorie every about producing one ton of semi-coke.
Containing carbonic oxide, hydrogen, methane etc. in tail of semi coke, it is a kind of well Gas Energy Source, but also contains sulfur dioxide, the substantial amounts of impurity such as hydrogen sulfide, tar, naphthalene, dust.General semi-coke stove produces tail gas and is substantially outer row at present.
Owing to worldwide energy crisis and pollution are day by day serious, energy-saving and cost-reducing and pollution administration has become the inevitable choice built a resource-conserving and environment-friendly society.Idle discharge in process of production, if the substantial amounts of tail of semi coke of by-product is not recycled, but is put, be will result in the significant wastage of resource by semi-coke enterprise.General produce 600000 tons of semi-coke production lines per year, if the residue tail of semi coke produced in remanufacture process is used for generating electricity, can the generating set of a set of 25MW of auxiliary construction.
At present, the mode that semi-coke furnace exhaust gas can carry out comprehensively utilizing is a lot, but regardless of Land use systems, will carry out desulfurizing and purifying, the position according to desulfurization, and tail of semi coke carries out desulfurizing and purifying and processes the preposition desulfurization treatment process of employing mostly.And preposition desulfurization treatment process is divided into wet desulphurization and two kinds of methods of dry desulfurization: wet desulphurization has much representativeness with arsenic alkaline process, ADA, modified ADA and tannin process.Catalytic wet oxidation technique is the main coal gas desulfurization technique of current China coking industry, is under the effect of catalyst, utilizes the ammonia in coal gas to absorb the hydrogen sulfide in coal gas for alkali source.Absorbing the doctor solution after hydrogen sulfide send regenerating section to carry out oxidation regeneration, the hydrogen sulfide of absorption changes into elemental sulfur, and certainly flows into foam tank with the form of sulfur foam, must give birth to sulfur or ripe sulfur then through centrifugation or melt process.Usual catalytic wet oxidation technique has the methods such as PDS, mimosa extract, HPF and FRC.The form of desulphurization plant has high tower regeneration, regeneration tank regeneration, a tower desulfurization regeneration technique, a tower half formula desulfurization regeneration technique etc..
When adopting the desulfurization that catalytic wet oxidation technique is used for semi-coke coal gas, doctor solution is absorbing in coal gas while hydrogen sulfide, also can react generation (NH4) 2SO3 or Na2SO3 with the SO2 in coal gas, cannot react with oxygen in regeneration tank or regenerator, by sulfur removing pregnant solution regeneration NH3 H2O or Na2CO3 solution, the secondary salts such as (NH4) 2SO4 or Na2SO4 can be generated on the contrary.Accordingly, because the existence of SO2, the regeneration effect of doctor solution is greatly lowered, and the consumption of desulfurization alkali liquor will increase accordingly, will keep identical assimilation effect, it is necessary to add more fresh desulfurization alkali liquor in system continuously.
Further, since the superficial linear velocity in a column that Wet Catalytic Oxidation Method desulfurization adopts packed tower is 0.4～0.6m/s, absorber portion height is about 15m, and the response time is much larger than 5s, therefore the impact of CO2 is just very big, also can consume partial desulfurization alkali liquor, make desulfurized effect reduce.
Therefore, the Wet Catalytic Oxidation Method of coke oven gas desulfurization is applied to semi-coke coal gas desulfurization is impracticable, need to it be adjusted, to remove the interference of SO2 and CO2.It is more that wet desulphurization simultaneously there is also equipment, the features such as technological operation is also more complicated, and equipment investment is bigger.
Compare Wet Catalytic Oxidation Method desulfurization, dry desulfurization efficiency is high, relatively suitable treatment is containing coal gas relatively low for H2S, dry desulfurizing process is to utilize solid absorbent to remove the hydrogen sulfide in coal gas and organic sulfur, the degree of purification of desulfurization is higher, it is adaptable to the process of lean sulphurous gas, is used for fine de-sulfur, operation is simple and reliable, and at present conventional desulfurizing agent is inexpensive ferrum oxide, activated carbon.
Regenerative process is mostly super regeneration, and regeneration is complete every time, must be blown off by the residual air in tower with steam, and after gas analysis is qualified, the tower that can fall is supplied gas.
And active carbon desulfurization is mainly by the catalysis of activated carbon and adsorption, the catalysis activity of activated carbon is very strong, and the H2S in coal gas is under the catalytic action of activated carbon, and oxidation reaction occurs the O2 a small amount of with coal gas, and the simple substance S that reaction generates is adsorbed in activated carbon surface.When activated carbon desulphurization agent absorption reaches capacity, desulfuration efficiency is decreased obviously, it is necessary to regenerate.The regeneration of activated carbon is determined according to the material adsorbed, S is at ambient pressure, fusing is started when 190 DEG C, about 440 DEG C just distil and become gaseous state, so, activated carbon desulphurization agent is regenerated by the superheated steam of about general 450-500 DEG C, when desulfurizing agent temperature brings up to a certain degree, elemental sulfur just precipitates out from activated carbon, and the sulfur of precipitation flows into sulfur recovery pond, forms solid-state sulfur after water-cooled.
In sum, dry desulfurization is relatively suitable for processing containing coal gas relatively low for H2S, has system simple, and the features such as adsorbent is renewable, reduced investment can be applicable in tail of semi coke cleaning and desulfurization field.But owing to tail of semi coke contains substantial amounts of impurity, its result is often run soon after equipment investment, and ground floor adsorbent surface just covers the sticky contaminants such as a coke charge oil, naphthalene, and makes system global failure.
Summary of the invention
The invention aims to solve the deficiency of above-mentioned technology and provide a kind of and can effectively overcome the impurity tail of semi coke desulfurization purifier to tail gas desulfurization influential effect in tail of semi coke.
In order to achieve the above object, tail of semi coke desulfurization purifier designed by the present invention, it is mainly made up of tail of semi coke intake header and tail of semi coke outlet header, tail of semi coke intake header is provided with three tail of semi coke imports be in charge of, tail of semi coke outlet header is provided with the outlet of three tail of semi coke be in charge of, is in charge of to be in charge of with tail of semi coke import by tail of semi coke import between tail of semi coke intake header and tail of semi coke outlet header and is provided with three absorbing units.This construction features, it is possible to select to run an absorbing unit or two absorbing units or three absorbing units according to the amount of tail of semi coke, it is possible to reduce the input of cost.
nullAbsorbing unit is mainly made up of adsorption tower，It is in charge of with tail of semi coke import bottom adsorption tower and is connected，Adsorption tower top is in charge of with tail of semi coke outlet and is connected，It is in charge of to be in charge of with tail of semi coke outlet in tail of semi coke import and is equipped with shut-off valve，Tail of semi coke import between shut-off valve and adsorption tower is in charge of and is in charge of is equipped with point for measuring temperature and pressure tap with tail of semi coke outlet，Tail of semi coke import between shut-off valve and adsorption tower is in charge of close shut-off valve place and is provided with nitrogen sweeping head，It is provided with blow-down pipe at adsorption tower top，Blow-down pipe is provided with atmospheric valve，Blow-down pipe is provided with analysis site，Superheat steam pipeline and regeneration pipeline it is provided with bottom adsorption tower，Superheat steam pipeline is provided with isolating valve,，Regeneration pipeline is provided with regeneration valve，Condensed water outlet pipeline it is provided with bottom adsorption tower，Condensed water outlet pipeline is provided with discharging valve，Condensed water outlet pipeline is communicated to cesspool.
SL-6 type adsorbent, SL-3 type adsorbent, SL-2 type adsorbent it is sequentially provided with from the bottom to top inside adsorption tower.
Type adsorbent Main Ingredients and Appearance is aluminium sesquioxide, and SL-3 type adsorbent Main Ingredients and Appearance is activated carbon, and SL-2 type adsorbent Main Ingredients and Appearance is α and γ ferrum oxide.
The using method of tail of semi coke desulfurization purifier, tail of semi coke enters from tail of semi coke intake header, it is in charge of bottom entrance adsorption tower through tail of semi coke import, moisture and large granular impurity is removed by SL-6 type adsorbent, tar, supersaturation naphthalene and solid particle polluter is removed then through SL-3 type adsorbent, then through SL-2 type adsorbent desulfurization, the tail of semi coke after purification is in charge of entrance tail of semi coke outlet header from tail of semi coke outlet and is discharged.
After SL-3 type adsorbent certain time within adsorption tower, adsorption tower resistance can be made to increase, when adsorption tower resistance reaches certain value, then need regeneration；During regeneration, the tail of semi coke import of single adsorption tower be in charge of respectively, tail of semi coke exports the shut-off valve being in charge of and closes, with superheated steam (0.3MPa, 180 DEG C) the SL-3 adsorbent of adsorption tower hypomere is purged, make adsorbed tar purge condensed water with superheated steam and be discharged to cesspool from the condensed water outlet pipeline bottom adsorption tower, supersaturation naphthalene volatilizees, superheated steam purges and terminates then again through nitrogen sweeping head nitrogen, dampness in adsorption tower to be replaced, and the adsorbent after regeneration can again put into tail of semi coke and purify production.
After SL-2 type adsorbent within adsorption tower uses certain time, when finding adsorption column outlet hydrogen sulfide content close to prescription, the tail of semi coke import of adsorption tower then can be in charge of the shut-off valve being in charge of with tail of semi coke outlet close, then again through nitrogen sweeping head by nitrogen to after in adsorption tower, tail of semi coke replaces safety approval, again the atmospheric valve on blow-down pipe and the regeneration valve on regenerating tube are opened, utilize natural convection air, SL-2 type adsorbent in adsorption tower is carried out oxidation regeneration, when regeneration no longer raises to SL-2 type adsorbent temperature, regeneration ending, after regeneration by nitrogen sweeping head nitrogen by replace in adsorption tower qualified after can from newly coming into operation.
The tail of semi coke desulfurization purifier that the present invention is obtained, it has following features.
Adsorption tower internal adsorption agent adopts layering to arrange, and according to different impurity features, adopts different adsorbents, and the efficiency of adsorption cleaning is high.
Vapours is passed by so that the tar of bottom adsorbent surface can melt drippage, and naphthalene can volatilize, so that it is guaranteed that follow-up adsorbent can normally use by arranging one bottom adsorption tower.
By being opened by the regeneration valve being arranged at the bottom of tower top atmospheric valve and tower, utilizing natural convection air, desulfurizing agent in tower is carried out oxidation regeneration, the desulfurizing agent Sulfur capacity after regeneration can improve about 15%.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
In conjunction with accompanying drawing, the invention will be further described by the examples below.
Embodiment 1.
As shown in Figure 1, the tail of semi coke desulfurization purifier that the present embodiment describes, it is mainly made up of tail of semi coke intake header 1 and tail of semi coke outlet header 2, tail of semi coke intake header 1 is provided with three tail of semi coke imports and is in charge of 19, tail of semi coke outlet header 2 is provided with the outlet of three tail of semi coke and is in charge of 20, between tail of semi coke intake header 1 and tail of semi coke outlet header 2 by tail of semi coke import be in charge of 19 and tail of semi coke import be in charge of 19 and be provided with three absorbing units.
nullAbsorbing unit is mainly made up of adsorption tower 3，It is in charge of 19 with tail of semi coke import bottom adsorption tower 3 to be connected，Adsorption tower 3 top is in charge of 20 with tail of semi coke outlet and is connected，It is in charge of 19 in tail of semi coke import to be in charge of on 20 be equipped with shut-off valve 4 with tail of semi coke outlet，Tail of semi coke import between shut-off valve 4 and adsorption tower 3 is in charge of 19 and is in charge of on 20 is equipped with point for measuring temperature 5 and pressure tap 6 with tail of semi coke outlet，Tail of semi coke import between shut-off valve 4 and adsorption tower 3 is in charge of on 19 and is provided with nitrogen sweeping head 14 near shut-off valve 4 place，It is provided with blow-down pipe 9 at adsorption tower 3 top，Blow-down pipe 9 is provided with atmospheric valve，Blow-down pipe 9 is provided with analysis site 15，Superheat steam pipeline 7 and regeneration pipeline 21 it is provided with bottom adsorption tower 3，Superheat steam pipeline 7 is provided with isolating valve, 13，Regeneration pipeline 21 is provided with regeneration valve 11，Condensed water outlet pipeline 8 it is provided with bottom adsorption tower 3，Condensed water outlet pipeline 8 is provided with discharging valve 12，Condensed water outlet pipeline 8 is communicated to cesspool 10.
SL-6 type adsorbent 16, SL-3 type adsorbent 17, SL-2 type adsorbent 18 it is sequentially provided with from the bottom to top inside adsorption tower 3.
Type adsorbent 16 Main Ingredients and Appearance is aluminium sesquioxide, and SL-3 type adsorbent 17 Main Ingredients and Appearance is activated carbon, and SL-2 type adsorbent 18 Main Ingredients and Appearance is α and γ ferrum oxide.
The using method of tail of semi coke desulfurization purifier, tail of semi coke enters from tail of semi coke intake header 1, it is in charge of bottom 19 entrance adsorption towers 3 through tail of semi coke import, moisture and large granular impurity is removed by SL-6 type adsorbent 16, tar, supersaturation naphthalene and solid particle polluter is removed then through SL-3 type adsorbent 17, then through SL-2 type adsorbent 18 desulfurization, the tail of semi coke after purification is in charge of 20 entrance tail of semi coke outlet headers 2 from tail of semi coke outlet and is discharged.
After SL-3 type adsorbent 17 within adsorption tower 3 adsorbs certain time, adsorption tower 3 resistance can be made to increase, when adsorption tower 3 resistance reaches certain value, then need regeneration；During regeneration, the tail of semi coke import of single adsorption tower 3 is in charge of 19 respectively, shut-off valve 4 that tail of semi coke outlet is in charge of on 20 cuts out, with superheated steam (0.3MPa, 180 DEG C) the SL-3 adsorbent of adsorption tower 3 hypomere is purged, make adsorbed tar purge condensed water with superheated steam and be discharged to cesspool 10 from the condensed water outlet pipeline 8 bottom adsorption tower 3, supersaturation naphthalene volatilizees, superheated steam purges and terminates then again through nitrogen sweeping head 14 nitrogen, dampness in adsorption tower 3 to be replaced, and the adsorbent after regeneration can again put into tail of semi coke and purify production.
After SL-2 type adsorbent 18 within adsorption tower 3 uses certain time, find when adsorption tower 3 exports hydrogen sulfide content close to prescription, then the tail of semi coke import of adsorption tower 3 can be in charge of 19 and tail of semi coke outlet be in charge of on 20 shut-off valve 4 close, then again through nitrogen sweeping head 14 by nitrogen to after in adsorption tower 3, tail of semi coke replaces safety approval, again the atmospheric valve on blow-down pipe 9 and the regeneration valve on regenerating tube 11 are opened, utilize natural convection air, SL-2 type adsorbent 18 in adsorption tower 3 is carried out oxidation regeneration, when regeneration no longer raises to SL-2 type adsorbent 18 temperature, regeneration ending, after regeneration by nitrogen sweeping head 14 with nitrogen by can from newly coming into operation after qualified for displacement in adsorption tower 3.
Claims (3)
1. a tail of semi coke desulfurization purifier, it is mainly made up of tail of semi coke intake header and tail of semi coke outlet header, it is characterized in that being provided with three tail of semi coke imports on tail of semi coke intake header is in charge of, tail of semi coke outlet header is provided with the outlet of three tail of semi coke be in charge of, is in charge of to be in charge of with tail of semi coke import by tail of semi coke import between tail of semi coke intake header and tail of semi coke outlet header and is provided with three absorbing units.
null2. want the tail of semi coke desulfurization purifier described in 1 according to right，It is characterized in that absorbing unit is mainly made up of adsorption tower，It is in charge of with tail of semi coke import bottom adsorption tower and is connected，Adsorption tower top is in charge of with tail of semi coke outlet and is connected，It is in charge of to be in charge of with tail of semi coke outlet in tail of semi coke import and is equipped with shut-off valve，Tail of semi coke import between shut-off valve and adsorption tower is in charge of and is in charge of is equipped with point for measuring temperature and pressure tap with tail of semi coke outlet，Tail of semi coke import between shut-off valve and adsorption tower is in charge of close shut-off valve place and is provided with nitrogen sweeping head，It is provided with blow-down pipe at adsorption tower top，Blow-down pipe is provided with atmospheric valve，Blow-down pipe is provided with analysis site，Superheat steam pipeline and regeneration pipeline it is provided with bottom adsorption tower，Superheat steam pipeline is provided with isolating valve,，Regeneration pipeline is provided with regeneration valve，Condensed water outlet pipeline it is provided with bottom adsorption tower，Condensed water outlet pipeline is provided with discharging valve，Condensed water outlet pipeline is communicated to cesspool.
3. tail of semi coke desulfurization purifier according to claim 2, is characterized in that being sequentially provided with SL-6 type adsorbent inside adsorption tower from the bottom to top, SL-3 type adsorbent, SL-2 type adsorbent.
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| CN201410784071.5A CN105779029A (en) | 2014-12-18 | 2014-12-18 | Semi-coke tail gas desulphurization purifier |
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| CN201410784071.5A CN105779029A (en) | 2014-12-18 | 2014-12-18 | Semi-coke tail gas desulphurization purifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365602A (en) * | 2017-07-18 | 2017-11-21 | 宝鸡市泰和石化工程有限公司 | Tail of semi coke polychotomy integrates after-treatment system and new technology |
| CN109054868A (en) * | 2018-10-11 | 2018-12-21 | 陕西东鑫垣化工有限责任公司 | Semi-coke device flue gas purification system |
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2014
- 2014-12-18 CN CN201410784071.5A patent/CN105779029A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365602A (en) * | 2017-07-18 | 2017-11-21 | 宝鸡市泰和石化工程有限公司 | Tail of semi coke polychotomy integrates after-treatment system and new technology |
| CN109054868A (en) * | 2018-10-11 | 2018-12-21 | 陕西东鑫垣化工有限责任公司 | Semi-coke device flue gas purification system |
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Application publication date: 20160720 |