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Low-temperature coke oven flue gas desulfurizing and denitrifying process

A technology for desulfurization and denitrification and flue gas, which is applied in the field of air pollution control, can solve the problems of harsh treatment process conditions, low efficiency, and immature process technology, and achieve the effects of saving desulfurization and denitrification costs, low prices, and improving desulfurization and denitrification efficiency.

Inactive Publication Date: 2017-01-18
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many research and development companies, and there are many methods proposed, mainly including the integration of coke oven flue gas low-temperature desulfurization and denitrification, heating coke oven flue gas + high-temperature catalytic reduction denitrification, SICS catalytic oxidation (organic catalytic method) desulfurization and denitrification, activated carbon desulfurization and denitrification and Activated coke desulfurization and denitrification process technology, but the process technology is not very mature, and the treatment process conditions are relatively harsh, and the efficiency is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A coke oven flue gas low-temperature desulfurization and denitrification process, the process includes the following methods:

[0034] (1) Preparation of SCR catalyst:

[0035] a) Disperse pottery clay, polymethyl methacrylate, and sodium silicate in deionized water, mix them evenly, and then put them into a mold for compression molding under a pressure of 10 MPa, and dry them at 110°C for 15 hours to obtain a dry product, wherein pottery clay, poly The mass ratio of methyl methacrylate to sodium silicate is 15:8:5;

[0036] b) Calcinate the dried product obtained in step a) at 900°C for 3 hours, take it out and cool it to room temperature naturally, then pulverize and sieve to a particle size of 10-20 mesh to obtain a granular substance, soak the obtained granular substance in mass In a nitric acid solution with a concentration of 20%, soak at 90°C for 2.2 hours, filter, wash with deionized water until neutral, and dry to obtain a nitric acid-treated powder;

[0037]...

Embodiment 2

[0042] A coke oven flue gas low-temperature desulfurization and denitrification process, the process includes the following methods:

[0043] (1) Preparation of SCR catalyst:

[0044] a) Disperse pottery clay, polymethyl methacrylate, and sodium silicate in deionized water, mix them evenly, then put them into a mold for compression molding under a pressure of 30 MPa, and dry them at 110°C for 15 hours to obtain a dry product, wherein pottery clay, poly The mass ratio of methyl methacrylate to sodium silicate is 20:10:5;

[0045] b) Calcinate the dried product obtained in step a) at 1200°C for 1 hour, take it out and cool it to room temperature naturally, then crush and sieve to a particle size of 10-20 mesh to obtain a granular substance, soak the obtained granular substance in mass In a nitric acid solution with a concentration of 50%, soak at 70°C for 1.5h, filter, wash with deionized water until neutral, and dry to obtain a nitric acid-treated powder;

[0046]c) Dissolve ...

Embodiment 3

[0051] A coke oven flue gas low-temperature desulfurization and denitrification process, the process includes the following methods:

[0052] (1) Preparation of SCR catalyst:

[0053] a) Disperse pottery clay, polymethyl methacrylate, and sodium silicate in deionized water, mix them evenly, and then put them into a mold for compression molding under a pressure of 15MPa, and dry them at 110°C for 11 hours to obtain a dry product, wherein pottery clay, poly The mass ratio of methyl methacrylate to sodium silicate is 16:8.5:5;

[0054] b) Calcinate the dried product obtained in step a) at 1000°C for 2.5h, take it out and cool it to room temperature naturally, then pulverize and sieve to a particle size of 10-20 mesh to obtain a granular substance, soak the obtained granular substance in In a nitric acid solution with a mass concentration of 30%, soak at 85°C for 2 hours, filter, wash with deionized water until neutral, and dry to obtain a nitric acid-treated powder;

[0055] c)...

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PUM

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Abstract

The invention discloses a low-temperature coke oven flue gas desulfurizing and denitrifying process. The low-temperature coke oven flue gas desulfurizing and denitrifying process comprises the following steps: firstly, preparing an SCR catalyst, wherein the catalyst is obtained by preparing clay, polymethyl methacrylate and sodium silicate into a carrier and then loading metal oxides of manganese and cerium, and the catalyst has good catalytic activity at low temperature and a large adsorption rate; then in a desulfurizing and denitrifying step, dedusting coke oven flue gas first and then injecting the coke oven flue gas into a desulfurizing adsorption zone for desulfurizing, wherein a desulfurized product is adsorbed by the SCR catalyst, and the catalyst can be recycled after desulfurization regeneration and activation treatment; injecting the dedusted and desulfurized coke oven flue gas into an SCR reaction zone, injecting cyanuric acid and ammonia gas into the SCR reaction zone in a mixing manner, contacting with the coke oven flue gas and the SCR catalyst, denitrifying, and discharging the desulfurized and denitrified flue gas after the catalyst is recycled. The low-temperature coke oven flue gas desulfurizing and denitrifying process has high desulfurizing and denitrifying efficiency and high SCR catalyst adsorbing rate, and can be recycled, so that the cost is reduced.

Description

[0001] Technical field: [0002] The invention relates to the field of air pollution control, in particular to a coke oven flue gas low-temperature desulfurization and denitrification process. [0003] Background technique: [0004] The fuel produced by the coke oven is mainly coke oven gas or mixed gas (the mixture of coke oven gas and blast furnace gas), and the gas is burned in the coke oven combustion chamber to form coke oven flue gas. The coke oven flue gas is discharged at high altitude through the coke oven underground flue and coke oven chimney under the action of hot pressure and suction of the chimney. Due to differences in coke oven type, fuel type, operating system and other factors, there are also differences in the flue gas volume, temperature, and gas composition of coke oven flue gas. The temperature of coke oven flue gas is generally 180-280°C, which belongs to medium and low temperature flue gas; SO 2 The concentration is generally 200-400mg / Nm 3 , NO X T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/60B01D53/50B01D53/56B01J31/32
CPCB01D53/8603B01D53/8628B01D53/8637B01D53/90B01D2251/2062B01D2255/2065B01D2255/70B01J31/32Y02A50/20
Inventor 王文庆
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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