Method for eliminating and recycling nitric oxide in combustion tail gas

A nitrogen oxide and tail gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of complex systems, high equipment and raw material costs, and difficulty in meeting the needs of zero nitrogen oxide emissions, and achieve elimination. The effect of NOx pollution, raw material and equipment cost reduction, equipment investment cost and maintenance cost reduction

Active Publication Date: 2019-04-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, NH 3 -The core components of SCR technology include catalytic material, urea injection system (urea tank, nozzle, urea metering unit, control system, etc.), nitrogen oxide sensor, etc.; the whole system is complex, the cost of equipment and raw materials is high, and the demand for catalytic materials is high temperature (greater than 200 ℃) will work
It is difficult to meet the needs of zero emission of nitrogen oxides in industries such as motor vehicles, coal / oil / natural gas power plants, building materials (cement, glass, ceramics, etc.), and steel

Method used

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  • Method for eliminating and recycling nitric oxide in combustion tail gas
  • Method for eliminating and recycling nitric oxide in combustion tail gas
  • Method for eliminating and recycling nitric oxide in combustion tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the combustion tail gas discharged from a coal-fired boiler used to smelt silica in a glass factory as an example.

[0041] After the combustion tail gas has been dedusted and desulfurized, it contains 1500ppm NOx, 16.5% CO 2 , 8% O 2 , 11.5%H 2 O, the balance is N 2 . The combustion tail gas sample was taken for experiments, the amount of molecular sieve adsorption material was 0.589g, the total gas flow rate was 900mL / min, the adsorption temperature was 100°C, and the space velocity was 11,000h -1 . The adsorbent used is Ce / Beta means that Ce is loaded on the Beta molecular sieve, and the composition expression method of the remaining adsorbents is similar to this), wherein the percentage content of Ce is 2wt%, and the NOx adsorption results are as follows figure 2 As shown, it takes about 41 seconds to reach adsorption saturation, and the saturated adsorption amount of NOx reaches 32.8 μmol / g adsorbent.

[0042] After the adsorption is saturated, stop fee...

Embodiment 2

[0046] Take the combustion tail gas discharged from a coal-fired boiler in a cement plant as an example.

[0047] After the combustion tail gas has been dedusted and desulfurized, it contains 1000ppm NOx, 12.5% ​​CO 2 , 9.2% O 2 , 6%H 2 O, the balance is N 2 . The combustion tail gas sample was taken for experiments, the amount of molecular sieve adsorption material was 0.288g, the total gas flow rate was 1000mL / min, the adsorption temperature was 150°C, and the space velocity was 25,000h -1 . The adsorbent used is La / Beta, wherein the percentage content of La is 5wt%, and the NOx adsorption results are as follows Figure 4 As shown, the adsorption saturation is reached after about 34 seconds, and the saturated adsorption amount of NOx reaches 33.4 μmol / g adsorbent.

[0048] After the adsorption is saturated, stop feeding the combustion tail gas, and change to feed air into the adsorbent and carry out the temperature-programmed desorption experiment. The results are as fol...

Embodiment 3

[0052] Take the combustion tail gas discharged from a gas-fired boiler in a power plant as an example.

[0053] After the combustion tail gas has been dedusted and desulfurized, it contains 500ppm NOx, 5% CO 2 , 8% O 2 , 5%H 2 O, the balance is N 2 . The combustion tail gas sample was taken for experiments, the amount of molecular sieve adsorption material was 0.144g, the total gas flow rate was 1000mL / min, the adsorption temperature was 80°C, and the space velocity was 50,000h -1 . The adsorbent used is Cu / ZSM-5, wherein the percentage content of Cu is 10wt%, and the NOx adsorption results are as follows Figure 6 As shown, the adsorption saturation is reached after about 47 seconds, and the saturated adsorption capacity of NOx reaches 33.6 μmol / g adsorbent.

[0054] After the adsorption is saturated, stop feeding the combustion tail gas, and change to feed air into the adsorbent and carry out the temperature-programmed desorption experiment. The results are as follows:...

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Abstract

The invention relates to a method for eliminating and recycling nitric oxide in combustion tail gas. The method includes the following steps that A, the combustion tail gas containing the nitric oxideand an adsorbing agent make contact with each other under the temperature smaller than 150 DEG C to adsorb the nitric oxide in the combustion tail gas, wherein the adsorbing agent comprises active components loaded onto a molecular sieve carrier, the active components comprise precious metal, rare earth metal or transition metal, and by elementary content, the active components account for 0.1-20wt% of the total mass of the adsorbing agent; B, high-temperature air which has the temperature larger than 125 DEG C is injected into the adsorbing agent so that the adsorbed nitric oxide can be desorbed and conveyed into a combustion room along with the high-temperature air to be used as combustion-assisting air. The method is suitable for all kinds of fire coal, fuel gas, oil burning boilers and automobile engines, NOx pollution is eliminated, NOx is also used as a combustion-assisting oxidant, and recycling of contaminants is realized.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide pollution control and resource reuse in combustion waste gas, in particular to a method for recycling nitrogen oxides in combustion waste gas produced in combustion processes such as coal / oil / natural gas. Background technique [0002] There are a large number of combustion devices and power devices fueled by coal, oil, and natural gas in industry, such as coal / oil / natural gas power plants, boilers and blast furnaces in industries such as building materials (cement, glass, ceramics, etc.), steel, and Motor vehicle engines, etc. Combustion will emit a large amount of nitrogen oxides (NOx), which has caused great harm to the ecological environment and human health. How to eliminate these NOx pollution is the direction of industrial denitrification technology. [0003] At present, the pollution control of nitrogen oxides generally adopts ammonia selective catalytic reduction technology (NH 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/86B01D53/56
CPCB01D53/02B01D53/8625B01D2259/4009
Inventor 沈美庆王军沈谷蓉王建强
Owner TIANJIN UNIV
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