CN112552932A - Dry quenching furnace circulating waste gas purification system - Google Patents
Dry quenching furnace circulating waste gas purification system Download PDFInfo
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- CN112552932A CN112552932A CN202011269353.3A CN202011269353A CN112552932A CN 112552932 A CN112552932 A CN 112552932A CN 202011269353 A CN202011269353 A CN 202011269353A CN 112552932 A CN112552932 A CN 112552932A
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- dry quenching
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- dust collector
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
Abstract
The utility model provides a coke dry quenching stove circulation exhaust gas purification system, belongs to the energy-concerving and environment-protective field of coking industry, along cycle gas's direction of circulation, including circulation gas pipeline, gravity dust collector, dry quenching boiler, flowmeter A, sack dust collector, gas detection device, air-blower and flowmeter B, circulation gas gets into the buffer line behind coke dry quenching boiler, is provided with an SO behind secondary dust collector sack dust collector2Absorption apparatus, said SO2The absorption device is a pipeline with ceramic balls dispersed inside, the surface of the ceramic balls is attached with an absorption carrier, the absorption carrier comprises three-dimensional CuO nano catalytic balls, and the surface of the catalytic balls is attached with a layer of mixed adsorbent containing rare earth lanthanum. The circulating waste gas purification system for the coke dry quenching furnace can meet the emission requirement, meets the environmental protection requirement and is convenient to implement.
Description
Technical Field
The invention discloses a dry quenching furnace circulating waste gas purification system, and belongs to the field of energy conservation and environmental protection in the coking industry.
Background
Quenching refers to cooling the burnt incandescent coke to a temperature convenient for transportation and storage, and quenchingThe method comprises two types of wet quenching and dry quenching, wherein the wet quenching process is a method for conveying high-temperature coke on a quenching handle to a quenching tower and directly sprinkling water on the high-temperature coke for cooling. The dry quenching is to use inert gas as carrier to quench coke, the dry quenching furnace is the main equipment in the dry quenching device and consists of the upper furnace top, pre-stored section (annular air flue), chute and cooling chamber, the fiery coke is in reverse contact with cold inert gas, generally nitrogen, in the dry quenching furnace to carry out heat exchange, and the coke is cooled. The inert gas absorbing the coke heat is discharged from the top of the furnace through a pipeline, the heat is transferred to a dry quenching furnace boiler by the discharged gas to generate steam, and the cooled inert gas is blown into the dry quenching furnace by a circulating fan to cool red coke. Because the inert gas circulates for a circle outside the furnace, the oxygen content of the inert gas is increased, the oxygen content of the inert gas is detected when the inert gas circularly enters the dry quenching furnace again, the oxygen content is reasonably released when exceeding the standard, but the circulating gas contains a large amount of SO2The gas and the dry quenching furnace are not provided with corresponding waste treatment devices, and the emission standard of sulfur dioxide in the ultralow emission standard of atmospheric pollutants in the coking chemical industry (DB13/2863-2018) is 80mg/m3Below, and the sulfur dioxide emission at this time was 150mg/m3Above, it does not meet the environmental protection requirements. In the prior art, some manufacturers convey the circulating gas discharged by the dry quenching furnace to a coke furnace flue gas desulfurization and denitrification system by using a pipeline for treatment, so that the circulating gas reaches the emission standard and is then discharged, but the method needs two facilities of the dry quenching furnace and the coke furnace to be close to each other, the cost is increased if the distance is too far, and the temperature of the circulating gas is too low to meet the temperature requirement of the SCR method process of the coke furnace due to too far distance, so that a purification system for the circulating waste gas of the dry quenching furnace is urgently needed at present, not only can the emission standard of the circulating discharged gas of the dry quenching furnace be met, but also can be simply installed and is convenient to implement.
Disclosure of Invention
The circulating waste gas purification system of the dry quenching furnace can meet the emission requirement and the environmental protection requirement and is convenient to implement.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a coke dry quenching stove circulation exhaust gas purification system, along cycle gas's direction of circulation, including circulation gas pipeline, gravity dust collector, coke dry quenching boiler, flowmeter A, sack dust collector, gas detection device, air-blower and flowmeter B, its characterized in that: the circulating gas enters a buffer pipeline after the coke dry quenching boiler, and an SO is arranged behind a cloth bag dust collector of the secondary dust collector2Absorption apparatus, said SO2The absorption device is a pipeline with ceramic balls dispersed inside, the surface of the ceramic balls is attached with an absorption carrier, the absorption carrier comprises three-dimensional CuO nano catalytic balls, and the surface of the catalytic balls is attached with a layer of mixed adsorbent containing rare earth lanthanum.
The technical scheme of the invention is further improved as follows: the mixed adsorbent also comprises hydromagnesite, quicklime and carbide slag.
The technical scheme of the invention is further improved as follows: the mixed adsorbent also comprises sodium carbonate and sodium bicarbonate.
The technical scheme of the invention is further improved as follows: the mixed adsorbent is mixed and then sintered on the surface of the catalytic ball.
The technical scheme of the invention is further improved as follows: the buffer pipeline is a spiral pipeline, and the number of spiral layers of the pipeline is 4-8.
The technical scheme of the invention is further improved as follows: and a butterfly valve is arranged on the circulating gas discharge pipeline.
Due to the adoption of the technical scheme, the invention has the technical effects that:
the purification system adopts the buffer pipeline to reduce the flow speed of the circulating gas in a buffering way and then the circulating gas enters the SO2Absorption means for supplying SO2Absorption of SO by the absorption apparatus2The time of (3) to make the absorption more sufficient; SO (SO)2The absorption device adopts a novel adsorbent, and SO is generated due to the high-efficiency catalytic action of rare earth lanthanum2Can be catalytically absorbed by the mixed adsorbent, SO that SO in the circulating gas is reduced2To reach the emission standard; with SO2The absorption device has oxygen absorption effect and reducesThe oxygen content of the recycle gas.
Before the dry quenching circulating gas enters the dry quenching furnace again after being cooled by external circulation, the oxygen content of the circulating gas is detected, if the oxygen content is too high, the circulating gas is scattered, and N with corresponding quantity is supplemented2To ensure the content of inert gas entering the dry quenching furnace, and the SO of the invention2Absorption device for absorbing SO2Meanwhile, oxygen is consumed, the oxygen content of the circulating gas is reduced, the outward dispersion amount of the circulating gas is reduced, more circulating gas enters the circulation, and the outward dispersion amount is reduced.
The purification system of the invention has simple device and can absorb SO2And oxygen to achieve the purpose of purification.
Drawings
FIG. 1 is a schematic view of a circulating exhaust gas purification system of a dry quenching furnace according to the present invention;
FIG. 2 is SO of the circulating exhaust gas purification system of the dry quenching furnace of the present invention2A schematic view of the interior of the absorption apparatus;
wherein, 1, dry quenching furnace, 2, circulating gas pipeline, 3, dry quenching boiler, 4, gravity dust-collecting device, 5, buffer pipeline, 6, flowmeter A, 7, cloth bag dust-collecting device, 8, SO2An absorption device 9, a gas detection device 10, a blower 11, flow meters B and 12 and butterfly valves.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
As shown in figure 1, the circulating waste gas purification system of the coke dry quenching furnace comprises a circulating gas pipeline 2, a gravity dust removal device 4, a coke dry quenching boiler 3, a flow meter 16, a cloth bag dust removal device 7, a gas detection device 9, a blower 10 and a flow meter 211 along the circulating direction of circulating gas, wherein the circulating gas enters a buffer pipeline 5 after the coke dry quenching boiler 3, and an SO (SO) is arranged behind the cloth bag dust removal device 7 of a secondary dust removal device2Absorption apparatus 8, SO2The absorption device 8 is a pipeline with ceramic balls arranged in an internal dispersed manner, the surface of each ceramic ball is attached with an absorption carrier, the absorption carrier comprises three-dimensional CuO nano catalytic balls, and the surface of each catalytic ball is attached with a layerA mixed adsorbent containing rare earth lanthanum.
The mixed adsorbent also comprises hydromagnesite, quicklime and carbide slag. The mixed adsorbent is sintered on the surface of the catalytic ball after being mixed. The buffer pipeline is a spiral pipeline, and the number of spiral layers of the pipeline is 4-8. A butterfly valve 12 is provided on the circulation gas exhaust pipe.
The circulating gas is cooled by circulation from the dry quenching furnace 1, is dedusted by the gravity dedusting device 4, enters the dry quenching boiler 3 for heat exchange cooling, enters the buffer pipeline 5 for buffer speed reduction, is subjected to flow detection by the flowmeter A6, and is dedusted for the second time by the cloth bag dedusting device 7, SO that SO is prevented from entering2Too large amount of dust in the circulating gas of the absorption device 8 to SO2The absorption device 8 is clogged.
Circulating the gas through SO2The absorption of the absorption device 8 is detected by the gas detection device 9 to obtain the oxygen content and SO2If the oxygen content exceeds the standard, the circulating gas is dispersed outside in a proper amount, the butterfly valve 12 is opened when the circulating gas is dispersed outside, and the residual circulating gas is detected by the flowmeter B11 and then is supplemented with a proper amount of exogenous inert gas N2Entering a dry quenching furnace 1 for circular quenching. The following table shows SO in the exhaust gas before and after the application of the purification system2And (4) comparing the contents of the components.
TABLE 1 SO in exhaust gas before and after application of a purification System2Content comparison of
| Before using the purification system (mg/m)3) | After using the purification System (mg/m)3) | |
| SO2Instantaneous content | 225 | 75 |
| SO2Average content | 110 | 35 |
As can be seen from the table above, the application of the purification system of the application can enable the exhaust gas of the dry quenching furnace to meet the exhaust requirements and meet the environmental protection requirements.
Claims (6)
1. The utility model provides a coke dry quenching stove circulation exhaust gas purification system, is along the circulation direction of circulating gas, including circulating gas pipeline (2), gravity dust collector (4), coke dry quenching boiler (3), flowmeter 1 (6), sack dust collector (7), gas detection device (9), air-blower (10) and flowmeter 2 (11), its characterized in that: the circulating gas enters a buffer pipeline (5) after the dry quenching boiler (3), and an SO is arranged behind a cloth bag dust collector (7) of the secondary dust collector2Absorption apparatus (8), said SO2The absorption device (8) is a pipeline with ceramic balls arranged in an internal dispersed mode, absorption carriers are attached to the surfaces of the ceramic balls, the absorption carriers comprise three-dimensional CuO nano catalytic balls, and a layer of mixed adsorbent containing rare earth lanthanum is attached to the surfaces of the catalytic balls.
2. The system of claim 1, wherein the mixed sorbent further comprises hydromagnesite, quicklime and carbide slag.
3. The system of claim 2, wherein the mixed sorbent further comprises sodium carbonate and sodium bicarbonate.
4. The system of claim 1, wherein the mixed sorbent is sintered on the surface of the catalytic spheres after mixing.
5. The system for purifying circulating exhaust gas of a dry quenching furnace as claimed in claim 1, wherein the buffer pipeline is a spiral pipeline, and the number of spiral layers of the pipeline is 4-8.
6. The system for purifying circulating exhaust gas of a dry quenching furnace as claimed in claim 1, wherein the circulating gas discharge pipe is provided with a butterfly valve (12).
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| CN202011269353.3A CN112552932A (en) | 2020-11-13 | 2020-11-13 | Dry quenching furnace circulating waste gas purification system |
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| CN202011269353.3A CN112552932A (en) | 2020-11-13 | 2020-11-13 | Dry quenching furnace circulating waste gas purification system |
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Application publication date: 20210326 |