CN100434142C - Process for realizing medium temperature dry-method direct denitration of flue gas by using ethanol - Google Patents

Process for realizing medium temperature dry-method direct denitration of flue gas by using ethanol Download PDF

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Publication number
CN100434142C
CN100434142C CNB2006100266655A CN200610026665A CN100434142C CN 100434142 C CN100434142 C CN 100434142C CN B2006100266655 A CNB2006100266655 A CN B2006100266655A CN 200610026665 A CN200610026665 A CN 200610026665A CN 100434142 C CN100434142 C CN 100434142C
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China
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ethanol
denitration
flue gas
nitric oxide
fumes
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CNB2006100266655A
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Chinese (zh)
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CN1883767A (en
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王恩禄
徐旭常
章明川
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上海交通大学
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Abstract

The present invention relates to a method for mesothermal dry-method direct denitration of fumes by utilizing ethanol, which belongs to the technical field of environmental protection. The ethanol chemically reacts with nitric oxide and oxygen in the fumes to generate nitrogen, water vapour and carbon dioxide, so as to realize dry-method direct denitration of fumes, and when the ethanol is injected, the temperature of the fumes is 750 to 1100 DEG C. The present invention has the advantages that the ethanol in the fume mesothermal zone directly reacts with the nitric oxide in the fumes to generate the nitrogen after the combustion process of the injected fuel is finished; because the ethanol is injected into a flue whose fume temperature is the same as that of the fume mesothermal zone to react with the nitric oxide directly and quickly to generate the nitrogen in combustion equipment, a denitration reactor, a denitration byproduct separator and a catalyst are not demanded additionally, and thereby, the present invention has the characteristic of easy application; because the method for mesothermal dry-method direct denitration of fumes by utilizing ethanol is carried out after the fuel combustion, the method is not limited by burning equipment and fuel characteristics. The present invention has a broad application prospect.

Description

Utilize ethanol to realize the method for the direct denitration of dry fume

Technical field

The present invention relates to the method for environmental technology field, specifically is a kind of method of utilizing ethanol to realize the direct denitration of dry fume.

Background technology

In the fuel combustion process, owing to itself contain the nitrogen element, the high temperature of combustion process contains high concentration nitric oxide toxic gas in the gas of feasible burning back in addition, and environment is polluted.In the existing dry fume denitration technology, mainly comprise the air classification combustion technology taked in the high-temp combustion process, fuel staging combustion technology and SNCR technology again, afterbody low-temperature selective catalytic reduction and non-selective catalytic-reduction denitrified technology after combustion process finishes.Outside the deacration fractional combustion denitration technology, fuel staging denitration by refueling technology, SNCR denitration technology, selective-catalytic-reduction denitrified technology and non-selective catalytic-reduction denitrified technology all need the denitration additive.Wherein, fuel staging denitration by refueling technology is to add the denitration additive in high temperature reduction atmosphere zone, the SNCR denitration technology is to add the denitration additive in fuel high temperature after-flame zone, selective-catalytic-reduction denitrified technology and non-selective catalytic-reduction denitrified technology are that the lower temperature region after fuel combustion finishes adds the denitration additive, realize the denitration purpose of flue gas in high temperature and lower temperature region.Can realize the direct denitration of dry method at the middle temperature area between the low temperature after high temperature in combustion process and the burning end, it is a difficult problem to be solved always, because the high temperature denitration in the combustion process always contradicts with the raising efficiency of combustion, low-temperature selective catalytic reduction and special denitrification apparatus and the catalyst of non-selective catalytic-reduction denitrified Technology Need after burning finishes, investment and operating cost height.The direct denitration of warm dry method in the flue gas both can solve the contradiction of fuel combustion and denitrating flue gas, did not need special denitrification apparatus and catalyst again.

Find by prior art documents, Chinese patent application number: CN03125332.6, patent name is: the dry method flue gas cleaning technology and the system thereof of while desulphurization denitration, this patent readme is: the dry method flue gas cleaning technology and the system thereof that the invention discloses a kind of while desulphurization denitration, disclosed flue-gas denitration process is for adopting hydrogen peroxide or methyl alcohol as additive, it is ejected into the temperature that gives off from combustion apparatus is 350~700 ℃ of flue gases, make nitric oxide gas and hydrogen peroxide or methyl alcohol generation chemical reaction generation nitrogen dioxide gas in the flue gas, adopt ammoniacal liquor or urea as denitrfying agent, it is ejected into carries out denitration in the flue gas of handling through desulfurization and handle, make nitrogen dioxide gas and ammoniacal liquor or urea generation chemical reaction generation denitration accessory substance nitric acid ammonia in the flue gas.Foregoing invention fails to realize the direct denitration of flue gas, but flue gas through the lower temperature region after the desulfurization by add ammoniacal liquor or urea with before rely on and add the nitrogen dioxide gas that hydrogen peroxide or methyl alcohol generates and generate denitration accessory substance nitric acid ammonia realization denitrating flue gas purpose.Simultaneously, owing to increased denitration reaction tower and denitration product separator, cause SR increase, energy consumption to rise.

Summary of the invention

The objective of the invention is to overcome the deficiency that existing dry fume denitration technology exists, a kind of method of utilizing ethanol to realize the direct denitration of dry fume is provided, make it utilize ethanol to realize the direct denitration purpose of dry fume, have the characteristics that are easy to of implementing.

The present invention is achieved by the following technical solutions, flue gas zone after fuel combustion process finishes, ethanol is sprayed in the flue gas that contains nitric oxide gas, thereby make nitric oxide, oxygen and ethanol generation chemical reaction in the flue gas generate nitrogen, water vapour and the direct denitration of carbon dioxide realization dry fume.

The present invention utilizes ethanol to realize that the chemical equation of the direct denitration of dry fume is as follows:

2C 2H 5OH+2NO+5O 2→N 2+4CO 2+6H 2O

In addition, the chemical equation that remaining oxygen takes place after the fuel combustion in ethanol and the flue gas is as follows:

C 2H 5OH+3O 2→2CO 2+3H 2O

By above-mentioned chemical equation as can be known, spray into the ethanol in the flue gas, except that with flue gas in nitric oxide produce the chemical reaction, also with flue gas in remaining oxygen generation chemical reaction after the fuel combustion, the amount of alcohol that sprays into like this is just relevant with nitric oxide and amount of oxygen in the flue gas.Under nitric oxide in flue gas and the amount of oxygen certain condition, denitration efficiency reduces and increases with nitric oxide and ethanol molar percentage value.

Compare with existing dry method denitration technology, the invention has the advantages that: the first, inject ethanol that fuel combustion process finishes flue gas zone, back directly with flue gas in nitric oxide reaction generation nitrogen.The second, owing to ethanol be launched into flue-gas temperature in the combustion apparatus in the flue in zone with flue gas in the nitric oxide direct prompt reaction generate nitrogen, therefore do not need to arrange Benitration reactor, denitration separation of by-products device and catalyst in addition to have the characteristics that are easy to of implementing.Three, realize the direct denitration of dry fume because the present invention is flue gas zone after fuel combustion process is finished by ethanol, so the present invention do not limit by concrete combustion apparatus and fuel characteristic, wide application prospect is arranged.

Description of drawings

The device schematic diagram that Fig. 1 adopts for the embodiment of the invention

Fig. 2 is an A-A cutaway view shown in Figure 1

The specific embodiment

Be example with a coal-fired power station boiler below, utilize ethanol to realize that the direct denitration of dry fume is described in detail to the present invention in conjunction with Fig. 1 and Fig. 2.

Coal-fired contain nitric oxide production high-temperature flue gas what furnace of power-plant boilers 1 internal combustion generated, finish with burner hearth around behind the radiation heat transfer of water-cooling wall, flow into horizontal flue 2 successively, discharge tail vertical well gas flue 4 backs.Table 1 is for each component in the flue gas and inject the molar percentage of ethanol, and table 2 is injected the denitration efficiency of ethanol under different flue-gas temperatures under table 1 condition.

Each component and inject the molar percentage of ethanol in table 1 flue gas

The denitration efficiency of table 2 ethanol under different flue-gas temperatures

As shown in Table 2, be between 760~870 ℃ in flue-gas temperature, the ethanol of injecting has higher relatively denitration efficiency.Calculate and The actual running results according to coal-fired power station boiler heating power, flue-gas temperature is that the zone between 760~870 ℃ is the rear portion of horizontal flue 2, therefore utilizing ethanol injection apparatus 3 that ethanol is injected horizontal flue 2 flue-gas temperatures is zone between 760~870 ℃, generate nitrogen and realize the direct denitration of dry method with the nitric oxide reaction in the flue gas, have higher relatively denitration efficiency.

In addition, under nitric oxide in flue gas and the amount of oxygen certain condition, denitration efficiency reduces and raises with the ethanol molar percentage value of nitric oxide in the flue gas and adding.For guaranteeing the even distribution of ethanol in flue gas, ethanol injection apparatus 3 both cocoa is arranged on top, bottom and the left and right sides wall of horizontal flue 2, also can be arranged in the horizontal flue 2.

Claims (2)

1. method of utilizing ethanol to realize the direct denitration of dry fume, it is characterized in that: thus utilize nitric oxide, oxygen generation chemical reaction in ethanol and the flue gas to generate nitrogen, water vapour and the direct denitration of carbon dioxide realization dry fume, when ethanol was injected, flue-gas temperature was 760~870 ℃.
2. the method for utilizing ethanol to realize the direct denitration of dry fume according to claim 1 is characterized in that, under nitric oxide in flue gas and the amount of oxygen rigid condition, denitration efficiency reduces and increases with nitric oxide and ethanol molar percentage value.
CNB2006100266655A 2006-05-18 2006-05-18 Process for realizing medium temperature dry-method direct denitration of flue gas by using ethanol CN100434142C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102302893B (en) * 2011-06-20 2014-10-29 中国华能集团清洁能源技术研究院有限公司 Selective non-catalytic reduction and denitration method for circulating fluidized bed boiler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63205140A (en) * 1987-02-19 1988-08-24 Hidefumi Hirai Adsorbent for nitrogen monoxide and method for separating and removing nitrogen monoxide
CN1032548A (en) * 1987-10-14 1989-04-26 燃料技术有限公司 Reduce the method for nitrogen oxide in the waste gas
CN1084098A (en) * 1992-09-12 1994-03-23 中国科学院福建物质结构研究所 Eliminate the new method of nitrogen oxide gas contaminated environment
CN1589954A (en) * 2003-08-26 2005-03-09 武汉凯迪电力股份有限公司 Dry smoke cleaning process for desulfurizing and denitrating simultaneously and its system
US20050126159A1 (en) * 2003-12-11 2005-06-16 Cho Byong K. Method of reducing NOx in diesel engine exhaust

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63205140A (en) * 1987-02-19 1988-08-24 Hidefumi Hirai Adsorbent for nitrogen monoxide and method for separating and removing nitrogen monoxide
CN1032548A (en) * 1987-10-14 1989-04-26 燃料技术有限公司 Reduce the method for nitrogen oxide in the waste gas
CN1084098A (en) * 1992-09-12 1994-03-23 中国科学院福建物质结构研究所 Eliminate the new method of nitrogen oxide gas contaminated environment
CN1589954A (en) * 2003-08-26 2005-03-09 武汉凯迪电力股份有限公司 Dry smoke cleaning process for desulfurizing and denitrating simultaneously and its system
US20050126159A1 (en) * 2003-12-11 2005-06-16 Cho Byong K. Method of reducing NOx in diesel engine exhaust

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