CN103611417A - Wet-process denitration method for coke oven waste gas - Google Patents
Wet-process denitration method for coke oven waste gas Download PDFInfo
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- CN103611417A CN103611417A CN201310553948.5A CN201310553948A CN103611417A CN 103611417 A CN103611417 A CN 103611417A CN 201310553948 A CN201310553948 A CN 201310553948A CN 103611417 A CN103611417 A CN 103611417A
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Abstract
The invention discloses a wet-process denitration method for coke oven waste gas. The method comprises the following steps: pressurizing waste gas through a pressurization fan, and then cooling the waste gas to be smaller than 100 DEG C through a heat pipe exchanger; filling the cooled waste gas into a denitration tower, spraying cooling water and ozone into the denitration tower through an ozone generation device to generate oxidizing reaction between nitric oxide in the waste gas and the ozone, and performing capturing and purification through added absorption liquid; filling the purified waste gas into a neutralizer, and neutralizing acid mist in the waste gas; filling the neutralized waste gas into a centrifugal demister, and removing escaping liquid drops in the waste gas; filling the treated waste gas into the heat pipe exchanger, and heating the waste gas to be 72 to 200 DEG C; and filling the heated waste gas into a steam heater, heating the waste gas to be greater than 120 DEG C through the steam heater, and discharging the waste gas from a chimney. According to the process, the denitration efficiency of the waste gas is greater than 80 percent, and the removal efficiency of mercury is greater than 80 percent.
Description
Technical field
The present invention relates to a kind of coke oven exhaust gas wet denitration method.
Background technology
At present, there is no in the world the denitration engineering example of coke oven exhaust gas.Conventional exhaust gas denitration technology mainly contains three kinds: SCR method, SNCR method and catalytic oxidation/reducing process, and the former two belongs to dry method, and the latter belongs to wet method.Present stage, applying maximum is SCR method.But there is following problem in SCR method: engineering cost is extremely expensive, and operating cost is also very high, and floor space is large; Liquefied ammonia used is national secondary dangerous material, and management maintenance requires strict; The solid catalyst refuse difficult treatment producing; The ammonium sulfate that side reaction produces, ammonium bisulfite etc., easily in air preheater surface adhesion, affect the heat-transfer effect of air preheater; Smoke gas flow is after the catalysis of SCR method, and the sulfur trioxide concentration in flue gas increases, and the ability of follow-up wet type desulfurizing system removal sulfur trioxide is very low, causes the sulphur total amount of discharging in flue gas to increase; When old boiler is transformed, need its flue of transformation and air preheater, make to transform difficulty and increase, expense uprises; For the wearing and tearing of China's high-sulfur, ash coal, catalyst, the problem such as poisoning, also greatly increase, have a strong impact on the service life of catalyst and the security of operation of boiler.
And catalytic oxidation/reducing process is emerging denitration technology, it is mainly to carry out catalytic oxidation by NO, adopts water or rare nitric acid as absorbent, and the accessory substance of generation is rare nitric acid, can be used as industrial chemicals and sells outward.This is a kind of denitrating technique with good economic benefits, and the nitrogen oxide in recyclable flue gas, meets the requirement of recycling economy.
Summary of the invention
The defect that the present invention seeks to exist for prior art provides a kind of coke oven exhaust gas wet denitration method based on above-mentioned catalytic oxidation/reducing process denitration technology.
The present invention for achieving the above object, adopts following technical scheme: a kind of coke oven exhaust gas wet denitration method, comprises following processing step:
1), waste gas after booster fan supercharging, enter heat exchange of heat pipe, the temperature of waste gas is down to below 100 ℃;
2) waste gas, after cooling enters denitrating tower, and in denitrating tower, sprays into cooling water and ozone by ozone generating-device;
3), enter nitrogen oxide and described ozone generation oxidation reaction in the waste gas of denitrating tower, and trap purification by the absorption liquid adding;
4) waste gas, after being cleaned enters averager, and in averager, sends into alkaline solution by solution storage tank, and the acid mist in waste gas is carried out to neutralisation treatment;
5) waste gas, after averager is processed enters centrifugal type demister, and removes the drop of escaping by this centrifugal type demister from waste gas;
6) waste gas, after centrifugal type demister is processed enters heat exchange of heat pipe, and by heat exchange of heat pipe, waste gas is heated between 72 ℃ to 200 ℃;
7) waste gas, after heating finally enters steam heater, and by steam heater, waste gas is heated to more than 120 ℃, finally from smoke stack emission.
Further, described ozone generating-device is 0.5～5(ozone and the nitrogen oxide mol ratio being removed to the amount of the ozone spraying in denitrating tower).
Further, described absorption liquid is that concentration is in 5%～30%(percent by volume) between rare nitric acid.
Beneficial effect of the present invention: adopt the denitration efficiency of process of the present invention to be greater than 80%, removal of mercury efficiency is greater than 80%, rare nitric acid of recyclable 10%～20%.Owing to having adopted heat-pipe heat exchanger in the present invention, both reduced the temperature of denitrating tower entrance, can effectively waste heat be used for adding the waste gas after thermal purification again, saved energy consumption.In addition, before waste gas enters chimney, adopt steam heater that waste gas is heated to more than 120 ℃, can guarantee the safe operation of coke oven.In the outlet of denitrating tower, adopt averager to neutralize the acid mist carrying in waste gas, can alleviate follow-up equipment and be corroded.Below averager, be provided with centrifugal type demister, can effectively remove the fine droplets of escaping in waste gas.
Accompanying drawing explanation
Fig. 1 process chart of the present invention.
The specific embodiment
Shown in Fig. 1, be a kind of coke oven exhaust gas wet denitration method, comprise following processing step:
1), waste gas after booster fan 1 supercharging, enter heat exchange of heat pipe 2, by heat exchange of heat pipe 2, the temperature of waste gas is down to below 100 ℃;
2) waste gas, after cooling enters denitrating tower, and in denitrating tower, sprays into cooling water and ozone by ozone generating-device 3;
3), enter nitrogen oxide and described ozone generation oxidation reaction in the waste gas of denitrating tower, and trap purification by the absorption liquid adding; Wherein, purifying rear remaining absorption liquid will be stored in sour storage tank 8.Preferably, this absorption liquid is that concentration is in 5%～30%(percent by volume) between rare nitric acid.
4) waste gas, after being cleaned enters averager 4, and in averager 4, sends into alkaline solution by solution storage tank 5, and the acid mist in waste gas is carried out to neutralisation treatment;
5) waste gas, after averager 4 is processed enters centrifugal type demister 6, and removes the drop of escaping by this centrifugal type demister 6 from waste gas;
6) waste gas, after centrifugal type demister 6 is processed enters heat exchange of heat pipe 2, and by heat exchange of heat pipe 2, waste gas is heated between 72 ℃ to 200 ℃;
7) waste gas, after heating finally enters steam heater 7, and by steam heater 7, waste gas is heated to more than 120 ℃, finally from smoke stack emission.
Wherein, described ozone generating-device 3 is preferably 0.5～5(ozone and the nitrogen oxide mol ratio being removed to the amount of the ozone spraying in denitrating tower).
Example 1:
The concentration of certain coke-stove gas nitrogen oxide is 400mg/m3, and the amount that sprays into ozone is 0.5(ozone and the nitrogen oxide mol ratio being removed), adopt rare nitric acid of 10% to absorb, the denitration efficiency of acquisition is 85%.
Example 2:
The concentration of certain coke-stove gas nitrogen oxide is 400mg/m3, and the amount that sprays into ozone is 05(ozone and the nitrogen oxide mol ratio being removed), adopt rare nitric acid of 10% to absorb, the denitration efficiency of acquisition is 95%.
Example 3:
The concentration of certain coke-stove gas nitrogen oxide is 400mg/m3, and the amount that sprays into ozone is 1.8(ozone and the nitrogen oxide mol ratio being removed), adopt rare nitric acid of 30% to absorb, the denitration efficiency of acquisition is 85%.
Example 4:
The concentration of certain coke-stove gas nitrogen oxide is 400mg/m3, and the amount that sprays into ozone is 2.3(ozone and the nitrogen oxide mol ratio being removed), adopt rare nitric acid of 30% to absorb, the denitration efficiency of acquisition is 89%.
Example 5:
The concentration of certain coke-stove gas nitrogen oxide is 200mg/m3, and the amount that sprays into ozone is 0.8(ozone and the nitrogen oxide mol ratio being removed), adopt rare nitric acid of 5% to absorb, the denitration efficiency of acquisition is 81%.
Example 6:
The concentration of certain coke-stove gas nitrogen oxide is 280mg/m3, and the amount that sprays into ozone is 0.2(ozone and the nitrogen oxide mol ratio being removed), adopt water to absorb, the denitration efficiency of acquisition is 96%.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a coke oven exhaust gas wet denitration method, is characterized in that, comprises following processing step:
1), waste gas after booster fan supercharging, enter heat exchange of heat pipe, the temperature of waste gas is down to below 100 ℃;
2) waste gas, after cooling enters denitrating tower, and in denitrating tower, sprays into cooling water and ozone by ozone generating-device;
3), enter nitrogen oxide and described ozone generation oxidation reaction in the waste gas of denitrating tower, and trap purification by the absorption liquid adding;
4) waste gas, after being cleaned enters averager, and in averager, sends into alkaline solution by solution storage tank, and the acid mist in waste gas is carried out to neutralisation treatment;
5) waste gas, after averager is processed enters centrifugal type demister, and removes the drop of escaping by this centrifugal type demister from waste gas;
6) waste gas, after centrifugal type demister is processed enters heat exchange of heat pipe, and by heat exchange of heat pipe, waste gas is heated between 72 ℃ to 200 ℃;
7) waste gas, after heating finally enters steam heater, and by steam heater, waste gas is heated to more than 120 ℃, finally from smoke stack emission.
2. coke oven exhaust gas wet denitration method according to claim 1, described ozone generating-device is 0.5～5(ozone and the nitrogen oxide mol ratio being removed to the amount of the ozone spraying in denitrating tower).
3. coke oven exhaust gas wet denitration method according to claim 1, described absorption liquid is that concentration is in 5%～30%(percent by volume) between rare nitric acid.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105413423A (en) * | 2015-11-13 | 2016-03-23 | 黄冈银河阿迪药业有限公司 | Method for eliminating nitrogen oxide waste gas produced in metronidazole production process |
| CN107185373A (en) * | 2017-06-12 | 2017-09-22 | 太仓运权化工防腐设备有限公司 | A kind of denitration wastewater waste gas cleaning system |
| CN108355483A (en) * | 2018-02-02 | 2018-08-03 | 东华大学 | A kind of wet denitration system and method absorbing flue gas based on catalytic ozonation |
| CN109520320A (en) * | 2019-01-15 | 2019-03-26 | 山东宏旺实业有限公司 | A kind of annealed wire exhaust treatment system |
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| CN1768902A (en) * | 2005-10-14 | 2006-05-10 | 浙江大学 | Ozone oxidation and denitration method of boiler flue gas |
| CN102527206A (en) * | 2012-01-16 | 2012-07-04 | 中悦浦利莱环保科技有限公司 | Method and device for treating oxynitride-containing smoke |
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| CN1768902A (en) * | 2005-10-14 | 2006-05-10 | 浙江大学 | Ozone oxidation and denitration method of boiler flue gas |
| CN102527206A (en) * | 2012-01-16 | 2012-07-04 | 中悦浦利莱环保科技有限公司 | Method and device for treating oxynitride-containing smoke |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105413423A (en) * | 2015-11-13 | 2016-03-23 | 黄冈银河阿迪药业有限公司 | Method for eliminating nitrogen oxide waste gas produced in metronidazole production process |
| CN107185373A (en) * | 2017-06-12 | 2017-09-22 | 太仓运权化工防腐设备有限公司 | A kind of denitration wastewater waste gas cleaning system |
| CN108355483A (en) * | 2018-02-02 | 2018-08-03 | 东华大学 | A kind of wet denitration system and method absorbing flue gas based on catalytic ozonation |
| CN108355483B (en) * | 2018-02-02 | 2021-01-15 | 东华大学 | Wet denitration system and method based on ozone catalytic oxidation absorption of flue gas |
| CN109520320A (en) * | 2019-01-15 | 2019-03-26 | 山东宏旺实业有限公司 | A kind of annealed wire exhaust treatment system |
| CN109520320B (en) * | 2019-01-15 | 2021-06-01 | 山东宏旺实业有限公司 | Annealing line exhaust treatment system |
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| CN103611417B (en) | 2016-09-07 |
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