CN212492410U - Flue gas desulfurization waste salt regeneration equipment - Google Patents
Flue gas desulfurization waste salt regeneration equipment Download PDFInfo
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- CN212492410U CN212492410U CN202021617761.9U CN202021617761U CN212492410U CN 212492410 U CN212492410 U CN 212492410U CN 202021617761 U CN202021617761 U CN 202021617761U CN 212492410 U CN212492410 U CN 212492410U
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Abstract
The utility model discloses a flue gas desulfurization waste salt regeneration facility belongs to coke oven flue gas processing technology field. Comprises a sodium bicarbonate generating device, an ammonium sulfate generating device and an ammonium bicarbonate recycling device; the sodium bicarbonate generating device comprises a desulfurization waste salt storage tank, a desulfurization waste salt pretreatment kettle, a plate-and-frame filter press, a sodium bicarbonate reaction kettle, a sodium bicarbonate centrifugal machine and a mother liquor storage tank I which are connected through a pipeline; the ammonium sulfate generating device comprises an ammonium bicarbonate decomposition tower, a reboiler, a sodium sulfate reaction kettle, a sodium sulfate centrifuge, a mother liquor storage tank II, an ammonium sulfate reaction kettle, an ammonium sulfate centrifuge and a mother liquor storage tank III which are connected through pipelines; the ammonium bicarbonate recovery device comprises an ammonia injection absorption tank, an air compressor, a gas buffer tank, a primary sodium bicarbonate recovery tower, a mother liquor storage tank IV, a secondary sodium bicarbonate recovery tower and a mother liquor storage tank V which are connected through pipelines. The utility model discloses can reduce flue gas dry process desulfurization's running cost, play important, positive realistic meaning to optimizing environmental condition.
Description
Technical Field
The utility model belongs to the technical field of coke oven flue gas is handled, relate to flue gas desulfurization waste salt and handle, concretely relates to flue gas desulfurization waste salt regeneration facility.
Background
In industrial furnaces and kilns, wet, dry and semi-dry desulfurization processes are mostly adopted for desulfurization of combustion exhaust gas such as coke oven flue exhaust gas, coal, gas boiler exhaust gas, electric arc furnaces, incinerators and the like. The flue gas after wet desulfurization and semi-dry desulfurization has high water vapor content and poor diffusion conditions, and condensed water drops can be formed when the flue gas leaves a chimney, so-called chimney rain and white smoke plume are formed, the environment is polluted, and the flue gas is not recommended by the current environmental protection policy. The dry flue gas desulfurization is more and more accepted by the industry due to the advantages of low investment of process equipment, simple operation, no corrosion of equipment, no generation of waste water, no white smoke plume, mature technology, wide operating temperature range and the like.
However, the main component of the solid waste desulfurization salt generated by sodium bicarbonate dry desulfurization is a mixture of sodium sulfate and sodium carbonate, the solid waste desulfurization salt has no effective treatment method at present, and the accumulation of a large amount of the solid waste salt can cause serious environmental pollution and high operation cost. Taking dry desulfurization with sodium bicarbonate as a desulfurizing agent as an example, the sodium-sulfur ratio of flue gas desulfurization is 3:1 (including unreacted sodium carbonate in desulfurization waste salt), the price of sodium bicarbonate produced in China in the current market is 1750 yuan/ton, grinding sodium bicarbonate to about 800 meshes by a grinding machine requires 100 yuan of cost, namely, 1 ton of sulfur dioxide is removed from flue gas, and only the cost of the desulfurizing agent is (1750 yuan +100 yuan) × 3=5550 yuan. Therefore, due to the blank of the regeneration technology of the waste salt of the dry desulphurization, the operation cost of the industry is high, and the defect of serious environmental pollution exists.
In order to solve the above technical problem that the unable processing of current flue gas desulfurization waste salt caused, the utility model develops a flue gas desulfurization waste salt regeneration facility.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flue gas desulfurization waste salt regeneration facility.
The utility model discloses a realize through following technical scheme:
a flue gas desulfurization waste salt regeneration device comprises a sodium bicarbonate generation device, an ammonium sulfate generation device and an ammonium bicarbonate recovery device;
the sodium bicarbonate generating device comprises a desulfurization waste salt storage tank, a desulfurization waste salt pretreatment kettle, a plate-and-frame filter press, a sodium bicarbonate reaction kettle, a sodium bicarbonate centrifugal machine and a mother liquor storage tank I which are sequentially connected through a pipeline;
the ammonium sulfate generating device comprises an ammonium bicarbonate decomposition tower, a reboiler, a sodium sulfate reaction kettle, a sodium sulfate centrifuge, a mother liquor storage tank II, an ammonium sulfate reaction kettle, an ammonium sulfate centrifuge and a mother liquor storage tank III which are sequentially connected through pipelines;
the ammonium bicarbonate recovery device comprises an ammonia injection absorption tank, an air compressor, a gas buffer tank, a primary sodium bicarbonate recovery tower, a mother liquor storage tank IV, a secondary sodium bicarbonate recovery tower and a mother liquor storage tank V which are connected through pipelines, wherein the primary sodium bicarbonate recovery tower and the secondary sodium bicarbonate recovery tower are respectively connected with the ammonia injection absorption tank and a sodium bicarbonate reaction kettle through pipelines;
the ammonium bicarbonate decomposition tower is respectively connected with a mother liquor storage tank I and an ammonia injection absorption tank through pipelines.
Further, the desulfurization waste salt pretreatment kettle is provided with a first coagulant adding device, a second flocculant adding device and a pH regulator adding device.
The sodium bicarbonate reaction kettle is provided with an ammonium bicarbonate adding device.
The ammonium sulfate reaction kettle is provided with a seed crystal adding device for adding ammonium sulfate seed crystals.
The reboiler and the ammonium bicarbonate decomposition tower are connected through a pipeline provided with a circulating pump to form circulation.
The utility model discloses but wide application in flue gas dry process desulfurization waste salt regeneration, the product of desulfurization waste salt regeneration is sodium bicarbonate and ammonium sulfate, and sodium bicarbonate uses as the desulfurizer of flue gas dry process desulfurization system after the mill grinds, and the ammonium sulfate uses as the chemical fertilizer. When the method is specifically implemented, firstly, the desulfurization waste salt is pretreated, namely, the desulfurization waste salt is dissolved in a desulfurization waste salt pretreatment kettle, after the desulfurization waste salt is fully dissolved, a pH regulator is added to control the pH of the solution to be between 8 and 9, then a coagulant is added to reduce COD in the solution, and impurities, coal tar and the like in the solution are effectively removed; then sending into sodium bicarbonate reaction kettle, making sodium sulfate saturated solution from sodium sulfate mother liquor after removing impurities, ammonium bicarbonate solution generated by ammonium bicarbonate recovery unit, and sodium sulfate solid returned from sodium sulfate reaction kettle, generating sodium bicarbonate at 36-42 deg.C, pumping mother liquor from sodium bicarbonate reaction kettle into ammonium bicarbonate decomposition tower through mother liquor delivery pump, exchanging heat with high temperature steam at 160 deg.C, ammonia gas and carbon dioxide gas generated by ammonium bicarbonate decomposition entering ammonium bicarbonate recovery system under negative pressure condition generated by ammonia jet absorption tank, mother liquor from ammonium bicarbonate decomposition tower bottom entering into reboiler through mother liquor circulating pump, exchanging heat with high temperature steam at 160 deg.C indirectly, decomposing ammonium bicarbonate in mother liquor into ammonia and carbon dioxide for recovery, heating and evaporating mother liquor in sodium sulfate reaction kettle, controlling boiling point of solution, and separating at 65-75 deg.C with centrifuge, sodium sulfate solid is obtained, the generated sodium sulfate returns to a sodium bicarbonate generating system, sodium bicarbonate is continuously generated, and mother liquor enters an ammonium sulfate generating system to produce an ammonium sulfate fertilizer; the ammonium bicarbonate recovery device is characterized in that ammonia generated by an ammonium bicarbonate decomposition tower is absorbed by an ammonia jet absorption tank to prepare concentrated ammonia water, the generated concentrated ammonia water is used for absorbing pressurized carbon dioxide, carbon dioxide unabsorbed by the ammonia jet absorption tank is pressurized to 0.8MPa through an air compressor and is stored in a gas buffer tank, the concentrated ammonia water and the carbon dioxide introduced into the gas buffer tank generate an ammonium bicarbonate solution in a primary sodium bicarbonate recovery tower, the ammonium bicarbonate solution is stored in a mother liquor storage tank and is conveyed to a desulfurization waste salt pretreatment kettle and a sodium bicarbonate reaction kettle through a mother liquor conveying pump, clear water is arranged in a secondary sodium bicarbonate recovery tower and is used for cleaning ammonia and unreacted carbon dioxide brought out along with gas in the primary sodium bicarbonate recovery tower.
The utility model discloses regenerated sodium bicarbonate cost is 800 yuan/ton, and desorption 1 ton sulfur dioxide only desulfurizer cost is 2400 yuan, with regard to the desulfurizer cost, can make present desulfurization cost reduce about 57%, and because the ammonium bicarbonate activity that the scene made is better moreover, it is efficient to purchase sodium bicarbonate desulfurization on the market, and the utilization ratio is also high, and the content of sodium carbonate in the desulfurization waste salt is only 3-4%.
The utility model discloses can solve desulfurization waste salt (useless admittedly) and pile up and environmental pollution problem, make desulfurizer and chemical fertilizer that can reuse, changing waste into valuables realizes the comprehensive utilization of resource, has reduced flue gas desulfurization running cost.
To sum up, the utility model discloses not only can reduce flue gas dry process desulfurization's running cost by a wide margin, improve desulfurization efficiency, increase sodium bicarbonate's utilization ratio plays important, positive realistic meaning to optimizing environmental condition simultaneously.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-a desulfurization waste salt storage tank; 2-desulfurization waste salt pretreatment kettle; 3-a plate and frame filter press; 4-waste salt mother liquor delivery pump; 5-sodium bicarbonate reaction kettle; 6-sodium bicarbonate centrifuge; 7-mother liquor storage tank I; 8-mother liquor delivery pump; 9-ammonium bicarbonate decomposition column; 10-a reboiler; 11-mother liquor circulating pump; a 12-sodium sulfate reaction kettle feed pump; 13-sodium sulfate reaction kettle; 14-sodium sulfate centrifuge; 15-mother liquor storage tank II; 16-ammonium sulfate reaction kettle feed pump; 17-ammonium sulfate reaction kettle; an 18-ammonium sulfate centrifuge; 19-mother liquor storage tank III; 20-ammonium sulfate mother liquor delivery pump; 21-ammonia spray absorption tank; 22-ammonia absorption circulation pump; 23-an ejector; 24-an air compressor; 25-gas buffer tank; 26-a primary sodium bicarbonate recovery column; 27-mother liquor tank IV; 28-ammonium bicarbonate solution liquid delivery pump; 29-secondary sodium bicarbonate recovery column; 30-mother liquor storage tank V; 31-dilute ammonia water delivery pump; 32-concentrated ammonia water delivery pump; 33-first coagulant addition means; 34-a second flocculant addition device; 35-a pH adjuster adding device; 36-ammonium bicarbonate adding means; 37-seed crystal adding device.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
The flue gas desulfurization waste salt regeneration equipment shown in fig. 1 comprises a sodium bicarbonate generation device, an ammonium sulfate generation device and an ammonium bicarbonate recovery device;
the sodium bicarbonate generating device comprises a desulfurization waste salt storage tank 1, a desulfurization waste salt pretreatment kettle 2, a plate-and-frame filter press 3, a sodium bicarbonate reaction kettle 5, a sodium bicarbonate centrifuge 6 and a mother liquor storage tank I7 which are sequentially connected through a pipeline; the ammonium sulfate generating device comprises an ammonium bicarbonate decomposition tower 9, a reboiler 10, a sodium sulfate reaction kettle 13, a sodium sulfate centrifuge 14, a mother liquor storage tank II 15, an ammonium sulfate reaction kettle 17, an ammonium sulfate centrifuge 18 and a mother liquor storage tank III 19 which are sequentially connected through pipelines;
the ammonium bicarbonate recovery device comprises an ammonia injection absorption tank 21, an air compressor 24, a gas buffer tank 25, a primary sodium bicarbonate recovery tower 26, a mother liquor storage tank IV 27, a secondary sodium bicarbonate recovery tower 29 and a mother liquor storage tank V30 which are connected through pipelines, wherein the primary sodium bicarbonate recovery tower 26 and the secondary sodium bicarbonate recovery tower 29 are respectively connected with the ammonia injection absorption tank 21 and a sodium bicarbonate reaction kettle 5 through pipelines; the ammonium bicarbonate decomposition tower 9 is respectively connected with a mother liquor storage tank I7 and an ammonia injection absorption tank 21 through pipelines.
During operation, as shown in fig. 1, solid desulfurization waste salt in a flue gas desulfurization waste salt storage tank 1 is dissolved in a desulfurization waste salt pretreatment kettle 2, after the desulfurization waste salt is fully dissolved, a pH regulator is added through a pH regulator adding device 35, the pH of the solution is controlled to be 8-9, a first flocculating agent and a second flocculating agent are respectively added into the desulfurization waste salt pretreatment kettle 2 through a first flocculating agent adding device 33 and a second flocculating agent adding device 34, after flocculation is fully stirred, impurities such as tar, smoke dust and the like in the solution are removed through filtration by a plate and frame filter press 3, clear liquid is sodium sulfate mother liquid, and the sodium sulfate mother liquid is conveyed into a sodium bicarbonate reaction kettle 5 through a waste salt mother liquid conveying pump 4;
sodium sulfate solid produced in a sodium sulfate reaction kettle 13 is put into a sodium bicarbonate reaction kettle 5 to prepare sodium sulfate saturated liquid, the sodium sulfate saturated liquid and ammonium bicarbonate slowly added through an ammonium bicarbonate adding device 36 are separated through a sodium bicarbonate centrifuge 6 after the reaction is finished to obtain sodium bicarbonate, the reaction formula is shown as (1),
Na2SO4 + 2NH4HCO3 = 2NaHCO3 + (NH4)2SO4 （1）
the mother liquor after centrifugation is stored in a mother liquor storage tank I7, enters an ammonium bicarbonate decomposition tower 9 through a mother liquor delivery pump 8, reversely exchanges heat with high-temperature steam at 160 ℃, the ammonium bicarbonate is decomposed to generate ammonia gas and carbon dioxide, enters an ammonium bicarbonate recovery system under the negative pressure condition generated by an ejector 23 of an ammonia injection absorption tank 21, the mother liquor at the bottom of the ammonium bicarbonate decomposition tower 9 enters a reboiler 10 through a mother liquor circulating pump 11, indirectly exchanges heat with the high-temperature steam at 160 ℃, the ammonium bicarbonate in the mother liquor is fully decomposed into ammonia and recovered with the carbon dioxide, the utilization rate of the ammonium bicarbonate is improved, the mother liquor after the ammonium bicarbonate is steamed is sent to a sodium sulfate reaction kettle 13 through a sodium sulfate reaction kettle feed pump 12, is heated at high temperature for evaporation and crystallization, is separated by a sodium sulfate centrifuge 14 to obtain sodium sulfate solid, the sodium sulfate returns to a sodium bicarbonate reaction kettle 5, and the mother liquor after centrifugation, is sent to an ammonium sulfate reaction kettle 17 through an ammonium sulfate reaction kettle feeding pump 16; the mother liquor is heated and evaporated by steam in an ammonium sulfate reaction kettle 17, ammonium sulfate seed crystals are added into the reaction kettle through a crystal adding device 37 to obtain ammonium sulfate solid with larger particles and higher purity, the mother liquor obtained by separation through an ammonium sulfate centrifuge 18 is stored in a mother liquor storage tank III 19, and finally returns to a sodium sulfate reaction kettle 13 through a sodium sulfate mother liquor conveying pump 20, and ammonium sulfate with higher purity is continuously generated after sodium sulfate is separated;
the ammonium bicarbonate recovery system utilizes ammonia water in an ammonia injection absorption tank 21 to enter an ejector 23 through an ammonia absorption circulating pump 22 to generate a micro negative pressure condition, ammonia gas and carbon dioxide generated by an ammonium bicarbonate decomposition tower 9 are introduced into the ammonium bicarbonate recovery system, the ammonia is absorbed by absorption liquid to generate concentrated ammonia water, the concentrated ammonia water is sent to a primary sodium bicarbonate recovery tower 26 through a concentrated ammonia water delivery pump 32, unabsorbed carbon dioxide is pressurized to 0.8MPa through an air compressor 24 and is stored in a gas buffer tank 25, the pressurized gas and the concentrated ammonia water react in the primary sodium bicarbonate recovery tower 26 to generate ammonium bicarbonate solution, the liquid is stored in a mother solution storage tank IV 27 and is sent to a desulfurization waste salt pretreatment kettle 2 and a sodium bicarbonate reaction kettle 5 through an ammonium bicarbonate solution delivery pump 28 to participate in generation of sodium bicarbonate, unreacted gas in the primary sodium bicarbonate recovery tower 26 and ammonia gas carried by tail gas enter a secondary sodium bicarbonate recovery tower 29 to be further absorbed, the liquid generated by the secondary sodium bicarbonate recovery tower 29 is stored in a mother liquor storage tank V30 and is sent to the ammonia injection absorption tank 21 through a dilute ammonia water delivery pump 31 for preparing strong ammonia water.
The above description of the present invention is intended to be illustrative, and not restrictive, and it will be understood by those skilled in the art that many modifications, variations, or equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims, and they all fall within the scope of the invention.
Claims (5)
1. A flue gas desulfurization waste salt regeneration device is characterized by comprising a sodium bicarbonate generation device, an ammonium sulfate generation device and an ammonium bicarbonate recovery device;
the sodium bicarbonate generating device comprises a desulfurization waste salt storage tank, a desulfurization waste salt pretreatment kettle, a plate-and-frame filter press, a sodium bicarbonate reaction kettle, a sodium bicarbonate centrifugal machine and a mother liquor storage tank I which are sequentially connected through a pipeline;
the ammonium sulfate generating device comprises an ammonium bicarbonate decomposition tower, a reboiler, a sodium sulfate reaction kettle, a sodium sulfate centrifuge, a mother liquor storage tank II, an ammonium sulfate reaction kettle, an ammonium sulfate centrifuge and a mother liquor storage tank III which are sequentially connected through pipelines;
the ammonium bicarbonate recovery device comprises an ammonia injection absorption tank, an air compressor, a gas buffer tank, a primary sodium bicarbonate recovery tower, a mother liquor storage tank IV, a secondary sodium bicarbonate recovery tower and a mother liquor storage tank V which are connected through pipelines, wherein the primary sodium bicarbonate recovery tower and the secondary sodium bicarbonate recovery tower are respectively connected with the ammonia injection absorption tank and a sodium bicarbonate reaction kettle through pipelines;
the ammonium bicarbonate decomposition tower is respectively connected with a mother liquor storage tank I and an ammonia injection absorption tank through pipelines.
2. The flue gas desulfurization waste salt regeneration equipment according to claim 1, wherein the desulfurization waste salt pretreatment kettle is provided with a first coagulant addition device, a second flocculant addition device and a pH regulator addition device.
3. The flue gas desulfurization waste salt regeneration device according to claim 1, wherein the sodium bicarbonate reaction kettle is provided with an ammonium bicarbonate adding device.
4. The flue gas desulfurization waste salt regeneration device as claimed in claim 1, wherein the ammonium sulfate reaction kettle is provided with a seed crystal adding device.
5. The flue gas desulfurization waste salt regeneration equipment as claimed in claim 1, wherein the reboiler is connected with the ammonium bicarbonate decomposition tower through a pipeline provided with a circulating pump to form a circulation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111760457A (en) * | 2020-08-06 | 2020-10-13 | 山西长林能源科技有限公司 | Method and equipment for regenerating waste salt generated in flue gas desulfurization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111760457A (en) * | 2020-08-06 | 2020-10-13 | 山西长林能源科技有限公司 | Method and equipment for regenerating waste salt generated in flue gas desulfurization |
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