A Method of Using Coal Char to Reduce Emissions of Nitrogen Oxides

A nitrogen oxide and coal char technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of unstable operation, high catalyst cost, low nitrogen oxide removal efficiency, etc., and achieve good economical efficiency. Benefit, good responsiveness, small footprint

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the disadvantages of the prior art such as unstable operation, high catalyst cost, and low removal efficiency of nitrogen oxides, and provides a method for reducing nitrogen oxide emissions by using coal char. Using the method of the present invention can effectively reduce power plants, Nitrogen oxide emissions from key polluting units such as oil refineries and steel mills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Carbonize 1000-5000μm coal at 650°C for 4 hours, then send it into the activation furnace, raise the temperature to 800°C, and pass in water vapor and nitrogen for 20 minutes to activate. After activation, the coal char particles are cooled to room temperature under the protection of nitrogen, and the coal char particles are placed in a fixed-bed reactor. The composition of laboratory flue gas (listed according to the volume percentage of each gas in the flue gas) is as follows: the flow rate is 100L / h, NOx is 1000ppmv, oxygen is 3.5% (gas volume percentage), and the rest is nitrogen. The flue gas temperature is 500°C, the reaction time is 0.8s, and the mass ratio of nitrogen oxides to coal char is 0.5. The flue gas is introduced into the reactor, and the gas composition at the outlet of the reactor is detected at the outlet of the reactor. The corresponding composition For; flow rate is 100L / h, NOx is 0ppm, CO is 2010ppm, oxygen is 0.5% (volume percentage), carbon diox...

Embodiment 2

[0031] Carbonize 500-3000μm coal at 580°C for 3 hours, then send it into the activation furnace, raise the temperature to 550°C, and pass in water vapor and nitrogen for 100 minutes to activate. After activation, the coal char particles are cooled to room temperature under the protection of nitrogen, and the coal char particles are placed in a fixed-bed reactor. The composition of laboratory flue gas (listed according to the volume percentage of each gas in the flue gas) is as follows: the flow rate is 100 L / h, NOx is 800 ppm, oxygen is 4.1% (volume percentage), and the rest is nitrogen. The flue gas temperature is 550°C, the reaction time is 2s, and the mass ratio of nitrogen oxides to coal char is 1. The flue gas is introduced in the reactor, and the gas composition of the discharge port is detected at the reactor discharge port, and its corresponding composition is; flow rate is 100L / h, NOx is 0ppm, CO is 5000ppm, and oxygen is 0.5% (volume percentage), Carbon dioxide is 3...

Embodiment 3

[0033] Coal with a thickness of 1000-2000 μm is carbonized at 600°C for 8 hours, then sent to an activation furnace, heated to 650°C, and activated with steam and nitrogen for 40 minutes. After activation, the coal char particles are cooled to room temperature under the protection of nitrogen, and the coal char particles are placed in a fixed-bed reactor. The composition of the laboratory flue gas (listed according to the volume percentage of each gas in the flue gas) is as follows: the flow rate is 200 L / h, NOx is 500 ppm, oxygen is 4.0% (volume percentage), and the rest is nitrogen. The flue gas temperature is 500°C, the reaction time is 5s, and the mass ratio of nitrogen oxides to coal char is 0.8. The flue gas is introduced in the reactor, and the gas composition of the discharge port is detected at the reactor discharge port, and its corresponding composition is; flow rate is 200L / h, NOx is 0ppm, CO is 3000ppm, and oxygen is 0.2% (volume percentage), Carbon dioxide is 2....

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Abstract

The invention discloses a method using coal coke to reduce nitrogen oxide emission, and solves the problems that the reduction of nitrogen oxide emission at present is unstable in operations, high in catalyst cost, low in removal efficiency of nitrogen oxide and the like. The method using coal coke to reduce nitrogen oxide emission includes the steps of smashing the coal coke into particles of 75-5000 micrometers, carrying out carbonization and activation, placing the particles in a fluidized bed reactor or a fixed bed reactor under the protection of nitrogen, enabling smoke containing the nitrogen oxide to pass through a fluidized bed layer or a fixed bed layer on the temperature condition of 300-800 DEG C, carrying out sedimentation and elimination on coal ash through a reactor bed layer after the reacted coal coke is transferred into the coal ash, and simultaneously adding fresh coal coke to the fluidized bed reactor or the fixed bed reactor.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a process for reducing the discharge of nitrogen oxides by using coal char. Background technique [0002] Nitrogen oxides mainly include NO, NO 2 and a small amount of N 2 O, etc., collectively referred to as NOx. NOx emissions can cause environmental pollution, lead to acid rain, and generate ground-level ozone (smog) that is harmful to human health and the environment under the action of sunlight. According to the statistics of the National Environmental Bulletin, the NOx emission of coal-fired thermal power plants in my country is estimated to be about 5 million t / a. [0003] The purpose of the present invention is to use coal char as a reactant to react with nitrogen oxides in flue gas to convert nitrogen oxides into nitrogen and discharge other harmless substances. This method has higher removal efficiency and lower fixed investment. Less, easy to operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/56
Inventor 杜江何文刘志龙陈卫红裴旭东李朝恒郭荣群张凡涂先红王秀珍
Owner CHINA PETROLEUM & CHEM CORP
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