CN1033338C - Furnace gas recoving method for closed calcium carbide furnace - Google Patents
Furnace gas recoving method for closed calcium carbide furnace Download PDFInfo
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- CN1033338C CN1033338C CN 89106061 CN89106061A CN1033338C CN 1033338 C CN1033338 C CN 1033338C CN 89106061 CN89106061 CN 89106061 CN 89106061 A CN89106061 A CN 89106061A CN 1033338 C CN1033338 C CN 1033338C
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- furnace
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- furnace gas
- calcium carbide
- dust
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Abstract
The present invention relates to a recovery method for a furnace gas in which carbon monoxide gas is mainly contained, and the furnace gas is generated while a closed calcium carbide furnace produces calcium carbide. The existing dry purification technology of the furnace gas of a closed calcium carbide furnace adopts the purification method that the combustion is carried out after dust removal, and then dust is removed again. The purification method has the defects of high investment, easy ash clogging of a system, incomplete purification, low heat utilization ratio, uneconomic and unreasonable technology, etc. The present invention adopts the method that combustion is carried out after dust removal, cyanide in gas and dust is completely decomposed at the time of combustion, and then the secondary dust removal is carried out. The present invention has the advantages of reasonable technology, high heat utilization ratio, complete purification, high safety and reliability, simple system structure and little investment.
Description
The present invention relates to a kind of closed calcium carbide furnace when producing calcium carbide, the recovery method that is generated based on the furnace gas of CO gas, it comprises following several steps: the switching of (1) high-temperature furnace gas; (2) by the flue gas emptying after with dedusting of air damper controller and air-introduced machine.
Because closed calcium carbide furnace contains utmost point poisonous substances such as higher hydrogen cyanide, cyanogas in furnace gas that is generated and the dust when producing calcium carbide, thus need remove, to avoid secondary pollution.But simultaneously again because the content of dust is higher, and its granularity is very thin, and short texture, viscosity are strong, and this just makes the purification difficulty of furnace gas increase.At present, domestic furnace gas recoving method for closed calcium carbide furnace mainly adopts wet cleaning technology, but this process for purifying need be with a large amount of water, carries out sewage disposal and must concentrate with the water of crossing, and to remove the cyanide in anhydrating, so its floor space is big, invests high; Because the carbon monoxide poisonous and harmful is inflammable and explosive, so the air-tightness of whole system is required height, the hidden danger of existence is more again, and simultaneously, the power consumption of system is big; Key equipment is easily stopped up by dust; And the utilization rate of heat is low; Recovery value is low.The external dry purification process that generally adopts is first dedusting, burning again, dedusting again, its technological process is roughly shown in figure one, high-temperature furnace gas is by after switching, cooling off, enter the sack cleaner dust removal by filtration, gas is wherein delivered to the boiler room by blower fan, as the gaseous fuel of boiler, is decomposed when contained cyanide burns in boiler in the gas.Dust then enters the incinerator burning by closed conveying, burns cyanide, and flue gas is sent into the sack cleaner dust removal by filtration through closed conveying again, after the dedusting ash is arranged down flue gas emptying.Although this technology has been avoided existing some defective in the wet cleaning technology, but shortcomings such as it still exists, and investment is high, ash easily blocks up in system, purify inadequately thoroughly, heat utilization ratio is low, simultaneously, for fear of secondary pollution, to send into the incinerator burning to ash, burn cyanide, uneconomical unreasonable on technology.
The objective of the invention is to overcome existing above-mentioned deficiency in the prior art, and provide on a kind of technology economical, rationally, small investment, furnace gas recoving method for closed calcium carbide furnace that heat utilization ratio is high.
Purpose proposed by the invention can be finished by the following method: the process for purifying that adopts burning back dedusting earlier, high-temperature furnace gas has passed through the grey seal apparatus of stop valve effect, and the gas combustion nozzle of its underpart, gas and air are evenly mixed in the waste heat boiler of nozzle exit and burn, impel the CO gas completing combustion in the furnace gas, this moment, temperature was up to 1500 ℃, cyanide in gas and the dust is thoroughly decomposed, at last, nontoxic flue gas makes gas reach the discharge standard that country allows through the double-filtration dedusting.
Description of drawings is as follows:
Fig. 1 is a dry purification process block diagram in the prior art.
Fig. 2 is a schematic diagram of the present invention.
Following the present invention will be further described by embodiment.
With reference to Fig. 2, the present invention adopts the purification method of burning back dedusting earlier, the furnace gas that comes out from closed calcium carbide furnace 1 enters commutator 2 atmospheric valves 3 and is used for 4 of recovery valves of furnace gas emptying nature are used to reclaim furnace gas, wherein commutator 2 plays voltage stabilizing and thick dedusting, reclaim if need, then furnace gas is by grey seal apparatus 5, it can make the dust in the furnace gas be unlikely long-pending as to stop up too much, work the effect that ends when not reclaiming again, thereafter, furnace gas is by the gas combustion nozzle 6 of grey seal apparatus 5 bottoms, under the effect of axial flow blower, make furnace gas and air even in the waste heat boiler 7 of nozzle exit, mixed combustion, impel the CO gas completing combustion in the furnace gas, this moment, ignition temperature reached 1500 ℃, cyanide in gas and the dust all decomposes, the dust structure is by original loosening in the furnace gas, gently, it is sticking that to have become structure closely knit, heavy, viscosity reduces, the minimizing of dust content in the change of this dust character and the gas reduces the difficulty of gas purification dedusting greatly, and does not have the pollution problem of cyanide in the back in the operation, at this moment, Boiler Steam is incorporated the steam network into, for producing, life department uses, and also can do other consideration.The temperature that goes out the cigarette ventilation of waste heat boiler 7 is about about 250 ℃, even if with entering the dedusting operation, gas carries out dedusting just by cyclone dust collectors 9 earlier, in this stage, gas temperature is reduced to 150 ℃～200 ℃, and then process sack cleaner 10 carries out the cascade filtration dedusting, make it reach the discharge standard that country allows, draw wind emptying by air-introduced machine 12 at last, 8 is choke relief valve, 11 is air damper controller, and wherein choke relief valve 8, air damper controller 11 have guaranteed that with recovery valve 4 the furnace gas pressure in the furnace of calcium carbide is zero, and promptly keeping the pressure in the stove is normal pressure.
The ash of all cinder-discharging ports is all sent with conveying worm.
The present invention compared with prior art has following advantage: (1) owing to the method that has adopted the earlier rear dedusting of burning, on technology Economical, rationally, furnace gas is by the burning of waste heat boiler, gas and ash Cyanide in the dirt all decomposes, and the physical property of dust is taken place Variation, reduced simultaneously the content of dust from gas, its physics is aobvious Heat all can be fully used together with the carbon dust combustion heat value in the dust, Improved the utilization rate of heat; (2) use the method, whole system The security reliability of system increases greatly, because earlier process burning of furnace gas, So whole system does not exist poisonous and harmful, inflammable and explosive gas. (3) easy to operate, system is difficult for stopping up; (4) there is not an oxygen Change carbon gas leak, sewage discharge, mortar processing and cyanide etc. two Inferior pollution problem; (5) whole system is simple in structure, floor space Little, small investment has preferably social benefit and economic benefit.
Claims (2)
1. furnace gas recoving method for closed calcium carbide furnace, it comprises the switching of high-temperature furnace gas and the flue gas after the dedusting is passed through air-introduced machine emptying, it is characterized in that: the switching of high-temperature furnace gas is undertaken by commutator 2, need the gas combustion nozzle 6 of the furnace gas of recovery through grey seal apparatus 5 and its underpart, furnace gas and air are evenly mixed in the waste heat boiler 7 in burner noz(zle) 6 exits and burn, carry out dust removal by filtration again, and to make the furnace gas pressure in the furnace of calcium carbide be zero.
2. furnace gas recoving method for closed calcium carbide furnace as claimed in claim 1 is characterized in that: guarantee that by recovery valve 4, choke relief valve 8 and air damper controller 11 furnace gas pressure is zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106061 CN1033338C (en) | 1989-07-18 | 1989-07-18 | Furnace gas recoving method for closed calcium carbide furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106061 CN1033338C (en) | 1989-07-18 | 1989-07-18 | Furnace gas recoving method for closed calcium carbide furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1048917A CN1048917A (en) | 1991-01-30 |
| CN1033338C true CN1033338C (en) | 1996-11-20 |
Family
ID=4856604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106061 Expired - Fee Related CN1033338C (en) | 1989-07-18 | 1989-07-18 | Furnace gas recoving method for closed calcium carbide furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1033338C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813423B (en) * | 2010-03-19 | 2012-05-30 | 昆明阳光基业股份有限公司 | Apparatus for recovering residual heat from tail gas of closed calcium carbide furnace |
| WO2013086613A1 (en) * | 2011-12-15 | 2013-06-20 | Hatch Ltd. | Systems for and methods of handling an off-gas containing carbon monoxide |
-
1989
- 1989-07-18 CN CN 89106061 patent/CN1033338C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1048917A (en) | 1991-01-30 |
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