CN102344833B - Method for preparing semi-water gas with fixed bed - Google Patents
Method for preparing semi-water gas with fixed bed Download PDFInfo
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- CN102344833B CN102344833B CN2011102638757A CN201110263875A CN102344833B CN 102344833 B CN102344833 B CN 102344833B CN 2011102638757 A CN2011102638757 A CN 2011102638757A CN 201110263875 A CN201110263875 A CN 201110263875A CN 102344833 B CN102344833 B CN 102344833B
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Abstract
The invention relates to a method for preparing semi-water gas with a fixed bed. The method comprises the following steps that: 1) about 250 DEG C of semi-water gas passes through a sensible heat recovery device and is cooled to 170 DEG C; 2) then the obtained semi-water gas enters an upper tower of a stripper, 50 DEG C of hot water is sprayed downwards from the top of the upper tower to perform counter-current contact with the semi-water gas, and the semi-water gas is cooled from about 170 DEG C to 70 DEG C; 3) the obtained semi-water gas enters a gas-making cooling tower from the upper tower of the stripper, is cooled to the room temperature and is sent to a gas holder; and 4) the temperature of hot water in the upper tower is increased to 85-90 DEG C, hot water enters a lower tower to perform counter-current contact with room-temperature air from a gas-making fan, the air is humidified and contains rich steam, the temperature is increased to about 75-80 DEG C, and the obtained air is sent to each gas gas-making furnace to prepare semi-water gas. By adopting the method, 200-250kg of steam (which amounts to 40kg of bituminous coal) can be saved per ton of ammonia, 200-250kg of gas-making wastewater can be reduced per ton of ammonia and 30 tons of circulated cooling water can be reduced per ton of ammonia. The method plays an important role in the realization of wastewater zero emission of the synthetic ammonia enterprise.
Description
Technical field
The present invention relates to the method for the fixed bed semi-water gas processed in a kind of chemical field.
Background technology
The ammonia enterprise of existing fixed bed semi-water gas processed adopts the part sensible heat in the heat recovering device recovery semi-water gas, and semi-water gas is down to 140 ℃ by 250 ℃.But owing to take the heat-transfer pipe tube wall that a large amount of fine coal sticks to heat recovering device out of in the gas, cause its heat transfer efficiency to reduce greatly, the temperature that goes out the sensible heat withdrawer often reaches 170 ℃, enter cooling tower again and be cooled to 35 ℃, this has not only wasted the sensible heat in the gas, main is that the heat of phase transformation that has 170 ℃ water vapor in the gas can not get recycling, and to consume a large amount of water coolants go the cooling, after water vapor condensation in the semi-water gas is water in addition, often cause the sewage tankful, increase quantity of wastewater effluent.
Summary of the invention
Purpose of the present invention is exactly for the sensible heat that overcomes semi-water gas in the prior art and the lower defective of heat of phase transformation recovery utilization rate, the method for a kind of fixed bed semi-water gas processed that provides.
To achieve these goals, the present invention has adopted following technical scheme:
The method of a kind of fixed bed semi-water gas processed may further comprise the steps:
A, from the semi-water gas of about 250 ℃ of coal gas Gas-making Furnace outlets, reclaim part sensible heat in the semi-water gas through heat recovering device earlier, make gas be down to 140-170 ℃;
B, 140-170 ℃ semi-water gas, enter the last tower of gas stripping column, about 50 ℃ hot water sprays downwards from last top of tower, carry out counter current contact with 140-170 ℃ semi-water gas, reclaim the heat of phase transformation of the water vapor in the semi-water gas and the sensible heat of gas, about the semi-water gas behind the spray is by 170 ℃, be down to 60-70 ℃;
C, be down to 60-70 ℃ of semi-water gass and enter gas making cooling washing tower from the last tower of gas stripping column, be down to the cabinet that degass behind the normal temperature;
D, tower has absorbed sensible heat in the semi-water gas and the hot water temperature of water vapor heat of phase transformation rises to about 85-90 ℃ on gas stripping column, enter by pipeline that the top of tower sprays under the gas stripping column downwards, carry out counter current contact with the normal temperature air from the gas making blower fan, this moment about 85-90 ℃ hot water by air lift after temperature be down to 55 ℃ and enter the buffering subsider, normal temperature air rises to about 75-80 ℃ and be rich in water vapor after by humidification, sends into each coal gas Gas-making Furnace and removes semi-water gas processed.
On the basis of technique scheme, following further technical scheme can be arranged:
Among the above-mentioned steps d, tower has absorbed sensible heat in the semi-water gas and 85-90 ℃ hot water of water vapor heat of phase transformation on gas stripping column, enter water sealed tank by pipeline, the water sealed tank top that is higher than tower under the gas stripping column suitable for reading, the top of the 85-90 in the water sealed tank ℃ hot water being introduced tower under the gas stripping column by pipeline sprays downwards again.The purpose that water seal is set is with after the preliminary sedimentation of flyash in the hot water of spray, sprays downwards again.
Among the above-mentioned steps d, carry out counter current contact with normal temperature air from the gas making blower fan, this moment about 85-90 ℃ hot water by air lift after temperature be down to 55 ℃ and enter the buffering subsider, be sent to entering hot water circulating pump after the flyash sedimentation again that tower sprays circulation on the gas stripping column.
Beneficial effect of the present invention:
Supply quantity of steam outside reducing in Ammonia Production: according to measurement result, ton ammonia can be saved outer for steam 200-250kg/ ton ammonia at least, amounts to bituminous coal about 40kg/TNH
3, by producing 10 * 10 per year
4About 4000 tons/year of enterprise's year feast-brand mark coal of ton synthetic ammonia is amounted to 3,200,000 yuan.
Reduce the sewage growing amount: because sewage is become water vapor by air lift, the sewage growing amount reduces 200-250kg/ ton ammonia, produces 10 * 10 per year
4Ton synthetic ammonia synthesis ammonia plant sewage growing amount reduces 2.5 * 10
4Ton/year (amount to and reduce by 75 tons of sewage growing amounts every day).
Reduce the gas making refrigeration cycle water yield: because the temperature that enters cooling tower is down to about 70 ℃ by previous about 170 ℃, cooling water inflow significantly reduces, by original 60m
3/ ton ammonia is down to 30m
3/ ton ammonia, the 15Kwh/ ton ammonia that can economize on electricity produces 10 * 10 per year
4The enterprise in ton/year, year saving electricity 1,500,000 kilowatt-hours are amounted to 600,000 yuan.
Description of drawings:
Fig. 1 is process flow sheet of the present invention.
Embodiment:
As shown in Figure 1, the method for a kind of fixed bed semi-water gas processed may further comprise the steps:
A, from about about the 250 ℃ semi-water gas of gas main (attracting from coal gas Gas-making Furnace outlet), reclaim part sensible heat in the semi-water gas through known heat recovering device continuously earlier, make gas be down to 140-170 ℃;
B, 140-170 ℃ semi-water gas enter the last tower of gas stripping column.Described gas stripping column is Fened Wei Shang tower and two parts of following tower, middle adopt two end sockets will about tower separate.Gas stripping column arranges a hot water circulating pump outward, about 50 ℃ hot water got to that top of tower sprays downwards Yu in the Shang tower 140-170 ℃ semi-water gas carry out counter current contact, reclaim the heat of phase transformation of the water vapor in the semi-water gas and the sensible heat of gas, about the semi-water gas behind the spray is by 170 ℃, be down to 60-70 ℃;
C, be down to 60-70 ℃ of semi-water gass and enter the gas making cooling tower from the last tower of gas stripping column, be down to the cabinet that degass behind the normal temperature;
D, tower has absorbed sensible heat in the semi-water gas and the hot water temperature of water vapor heat of phase transformation rises to about 85-90 ℃ on gas stripping column, enter the water sealed tank of gas stripping column outside by pipeline, the water sealed tank top that is higher than tower under the gas stripping column suitable for reading, the top of the 85-90 in the water sealed tank ℃ hot water being introduced tower under the gas stripping column by pipeline sprays downwards again, carry out counter current contact with the normal temperature air from the gas making blower fan, this moment about 85-90 ℃ hot water by air lift after temperature be down to 55 ℃ and enter the buffering subsider, normal temperature air rises to about 75-80 ℃ and be rich in water vapor after by humidification, sends into each coal gas Gas-making Furnace by pipeline and removes semi-water gas processed.
The purpose that water seal is set is with after the preliminary sedimentation of flyash in the hot water of spray, cleaning water is sprayed downwards again.In the buffering subsider, enter hot water circulating pump after with the flyash sedimentation again and be sent to that tower sprays circulation on the gas stripping column.Hot water circulating pump also connects the moisturizing groove, in order to replenish spray water.
Claims (3)
1. the method for a fixed bed semi-water gas processed is characterized in that may further comprise the steps:
A, from the semi-water gas of 250 ℃ of coal gas Gas-making Furnace outlets, reclaim part sensible heat in the semi-water gas through heat recovering device earlier, make semi-water gas be down to 140-170 ℃;
B, 140-170 ℃ semi-water gas, enter the last tower of gas stripping column, the outer hot water of introducing 50 ℃ of tower sprays downwards from last top of tower, carry out counter current contact with 140-170 ℃ semi-water gas, reclaim the heat of phase transformation of the water vapor in the semi-water gas and the sensible heat of gas, the semi-water gas behind spray is down to 60-70 ℃;
C, be down to 60-70 ℃ of semi-water gass and enter the gas making cooling tower from the last tower of gas stripping column, semi-water gas is sent to gas holder after being down to normal temperature;
D, tower has absorbed sensible heat in the semi-water gas and the hot water temperature of water vapor heat of phase transformation rises to 85-90 ℃ on gas stripping column, enter by pipeline that the top of tower sprays under the gas stripping column downwards, carry out counter current contact with the normal temperature air from the gas making blower fan, this moment 85-90 ℃ of hot water by air lift after temperature be down to 55 ℃ and enter the buffering subsider, normal temperature air is rich in water vapor and is warming up to 75-80 ℃ after by humidification, sends into each coal gas Gas-making Furnace and removes semi-water gas processed.
2. the method for a kind of fixed bed according to claim 1 semi-water gas processed is characterized in that may further comprise the steps:
85-90 described in the steps d ℃ hot water enters the outer water sealed tank that arranges of gas stripping column by pipeline, the water sealed tank top that is higher than tower under the gas stripping column suitable for reading, and the top of the 85-90 in the water sealed tank ℃ hot water being introduced tower under the gas stripping column by pipeline sprays downwards again.
3. the method for a kind of fixed bed according to claim 1 semi-water gas processed is characterized in that may further comprise the steps:
Be down to 55 ℃ hot water by temperature after the air lift described in the steps d, be sent in the buffering subsider that tower sprays circulation on the gas stripping column after with the flyash sedimentation again by hot water circulating pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102638757A CN102344833B (en) | 2011-09-07 | 2011-09-07 | Method for preparing semi-water gas with fixed bed |
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| CN2011102638757A CN102344833B (en) | 2011-09-07 | 2011-09-07 | Method for preparing semi-water gas with fixed bed |
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| CN102344833A CN102344833A (en) | 2012-02-08 |
| CN102344833B true CN102344833B (en) | 2013-09-04 |
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| CN103834441B (en) * | 2014-03-19 | 2015-11-25 | 河北凯跃化工集团有限公司 | A kind of gasification production waste recoverying and utilizing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172765A (en) * | 1996-08-06 | 1998-02-11 | 河北宣化化肥厂 | Full low-temp. fransforming technology for middle-scale synthetic ammonia producing and purifying transforming system |
| CN101704712A (en) * | 2009-10-29 | 2010-05-12 | 山西焦化股份有限公司 | Technological method for preparing methanol by combining coke oven gas with water gas |
-
2011
- 2011-09-07 CN CN2011102638757A patent/CN102344833B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172765A (en) * | 1996-08-06 | 1998-02-11 | 河北宣化化肥厂 | Full low-temp. fransforming technology for middle-scale synthetic ammonia producing and purifying transforming system |
| CN101704712A (en) * | 2009-10-29 | 2010-05-12 | 山西焦化股份有限公司 | Technological method for preparing methanol by combining coke oven gas with water gas |
Non-Patent Citations (2)
| Title |
|---|
| 刘庆武.半水煤气增加氨冷系统.《中氮肥》.2003,(第3期),44-45. |
| 半水煤气增加氨冷系统;刘庆武;《中氮肥》;20030531(第3期);44-45 * |
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