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Method for regulating oriented conversion of uranium in coal combustion process

A directional conversion, coal combustion technology, applied in the direction of fuel, solid fuel, lighting and heating equipment, etc., can solve problems such as human health hazards, achieve low investment and operating costs, simple operation, and reduce the release of uranium.

Active Publication Date: 2017-01-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, these uranium-containing fine particles enter the human body through the respiratory system and cause great harm to human health.

Method used

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  • Method for regulating oriented conversion of uranium in coal combustion process

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Embodiment 1

[0027] An embodiment of a method for regulating the directional transformation of uranium in a coal combustion process of the present invention is carried out by the above-mentioned device, and the specific steps of the method are as follows:

[0028] (1) The content m of organically bound uranium in coal was measured by step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS). 1 =6mg / kg coal;

[0029] (2) according to the content m of organically bound uranium in step (1) 1 , determine the amount of CaO added as m 2 =k 1 m 1 , where k is 1 =1.1, that is, 6.6 mg CaO is added per kg of coal;

[0030] (3) Pass figure 1 Medium additive adding system 1 adds additives to coal conveying system 2, the additives and coal are fully mixed in coal mill 3 and then enter the boiler hearth 4 for combustion, the temperature in the boiler hearth is 800 ℃, and the additives react with gaseous uranium in the boiler hearth The formation of solid ur...

Embodiment 2

[0034] An embodiment of a method for regulating the directional transformation of uranium in a coal combustion process of the present invention is carried out by the above-mentioned device, and the specific steps of the method are as follows:

[0035] (1) The content m of organically bound uranium in coal was measured by step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS). 1 =6.9mg / kg coal;

[0036] (2) according to the content m of organically bound uranium in step (1) 1, determine the amount of CaO added as m 2 =k 1 m 1 , where k is 1 = 1.3, that is, 8.97 mg CaO is added per kg of coal;

[0037] (3) Pass figure 1 The medium additive injection device 5 injects the additive into the boiler hearth 4, the temperature in the boiler hearth is 1000 ℃, and the additive reacts with gaseous uranium in the boiler hearth to generate solid uranium salt, which is fixed in the bottom ash;

[0038] (4) Test the concentration of gaseous ur...

Embodiment 3

[0041] An embodiment of a method for regulating the directional transformation of uranium in a coal combustion process of the present invention is carried out by the above-mentioned device, and the specific steps of the method are as follows:

[0042] (1) The content m of organically bound uranium in coal was measured by step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS). 1 =7.7mg / kg coal;

[0043] (2) according to the content m of organically bound uranium in step (1) 1 , determine the amount of CaO added as m 2 =k 1 m 1 , where k is 1 = 1.5, that is, 11.55 mg CaO is added per kg of coal;

[0044] (3) Pass figure 1 The medium additive adding system 1 adds the additive to the coal conveying system 2, and at the same time, injects the additive into the boiler hearth 4 through the additive injection device 5, the temperature in the boiler hearth is 1200 ℃, and the additive reacts with the gaseous uranium product in the boiler ...

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Abstract

The invention discloses a method for regulating the oriented conversion of uranium in a coal combustion process. The method comprises the following steps of (1) adopting a sequential chemical extraction method and an inductively coupled plasma mass spectrometry for testing the content m1 of organic combined state uranium in coal; (2) according to the content m1 of the organic combined state uranium in the step (1), confirming the additive amount m2 of an additive to be equal to k1.m1, wherein the k1 is an excess coefficient; (3) adding the additive into a coal handling system through an additive adding system, fully mixing the additive and the coal in a coal mill, combusting in a boiler furnace, and reacting the additive and gas-state uranium in the furnace to generate solid-state uranate, wherein the solid-state urinate is fixed in bottom ash. According to the method provided by the invention, without influencing the normal combustion of a boiler, the oriented conversion from a gas-state uranium product to the solid-state uranate can be effectively promoted, the release of the uranium during the coal combustion process can be effectively reduced as long as adding a little cheap additive, and the method is simple to operate and lower in investment and operation cost.

Description

technical field [0001] The invention belongs to the field of emission reduction control of radioactive pollutants in coal combustion flue gas, and particularly relates to a method for regulating the directional transformation of uranium in the coal combustion process. Background technique [0002] China is the country with the largest coal production and consumption in the world, and my country's coal resources are mainly consumed in coal-fired power plants. Coal-fired power plants are considered to be one of the largest sources of man-made air pollution, and they emit a large amount of dust, NOx, SO 2 It has caused great harm to the ecological environment. In addition, coal also contains natural radioactive elements, including 238U (t 1 / 2 =4.5×10 9 year) and 232Th(t 1 / 2 =1.4×10 10 years) and its decay products, and 40K (t 1 / 2 =1.3×10 9 year). With the gradual enhancement of people's awareness of environmental protection, the harm of radioactive pollutants discharged...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10F23J7/00
CPCC10L9/10C10L2200/029F23J7/00
Inventor 赵永椿杨建平张翼张军营郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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