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A method for coupled combustion of biomass and coal

A biomass and biomass char technology, applied in combustion methods, biofuels, controlled combustion, etc., can solve the problems of low combustion efficiency and heat utilization efficiency, small combustion boiler capacity, and poor biomass grindability, etc., to improve energy Utilization efficiency, reducing storage and transportation costs, and not easy to mold and deteriorate

Inactive Publication Date: 2020-12-15
ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since my country is a large agricultural country, it has the characteristics of a large amount of sustainable biomass supply. However, most of the biomass is disposed of by incineration and landfill, resulting in a large waste of resources. In order to make full use of resources, biomass is often burned directly in boilers. , but the existing combustion boiler capacity is small, it is difficult to meet the needs of a large amount of biomass combustion, and the combustion efficiency and heat utilization efficiency are low, the content of particulate matter and nitrogen oxides in the flue gas is high, and the use of traditional pulverized coal boilers Combustion, due to the poor grindability of biomass, it cannot be pulverized. To use a special burner, the pulverized coal boiler needs to be modified, and the pulverized coal boiler is difficult to transform, so the existing technology needs further improvement

Method used

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  • A method for coupled combustion of biomass and coal
  • A method for coupled combustion of biomass and coal
  • A method for coupled combustion of biomass and coal

Examples

Experimental program
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Effect test

Embodiment 1

[0030] like figure 1 A method for coupled combustion of biomass and coal is shown, which consists of the following steps:

[0031] (1) The biomass is crushed to 10mm, and cracked at 240°C by a two-stage biomass continuous pyrolysis device;

[0032] (2) The biomass charcoal obtained after pyrolysis is mixed with coal, enters the coal mill, and is ground at a speed of 25-100r / min to a particle size of 20-50μm, and the coal powder mixed with biomass charcoal powder enters the pulverized coal bin And enter the pulverized coal boiler through the powder feeder for combustion to generate flue gas;

[0033] (3) Sampling the flue gas of the pulverized coal boiler in step (2) and detecting it through a device that detects the ratio of biomass to coal combustion in coupling combustion 14 The abundance of C, determines the actual proportion of biomass.

[0034] like Figure 2-6 The shown two-stage biomass continuous pyrolysis device includes a pyrolysis device, the pyrolysis device in...

Embodiment 2

[0044] The difference between Example 1 and Example 2 is that in step (1) of a method for coupled combustion of biomass and coal, the biomass is crushed to 55 mm, and the biomass is crushed to 55 mm through a two-stage biomass continuous pyrolysis device at 250 ° C. Carry out cracking; step (2) the biomass charcoal produced from the cracked biomass is mixed with coal, the mixed biomass charcoal and coal enter the coal mill, and are ground at a speed of 50r / min until the biomass charcoal and coal The particle size is 30μm. The ground coal and biomass charcoal enter the pulverized coal bin and enter the pulverized coal boiler through the pulverizer for combustion to generate flue gas;

Embodiment 3

[0046] The difference between Example 1 and Example 2 is that in step (1) of a method for coupled combustion of biomass and coal, the biomass is crushed to 100 mm, and the biomass is crushed to 100 mm through a two-stage biomass continuous pyrolysis device at 260 ° C. Carry out cracking; step (2) the biomass charcoal produced by the cracked biomass is mixed with coal, the mixed biomass charcoal and coal enter the coal mill, and are ground at a speed of 100r / min until the biomass charcoal and coal The particle size is 50 μm. The ground coal and biomass charcoal enter the pulverized coal bin and enter the pulverized coal boiler through the pulverizer for combustion to generate flue gas.

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Abstract

The invention belongs to the technical field of biomass thermal energy conversion and utilization, and particularly relates to a biomass and coal coupling burning method. The biomass and coal couplingburning method comprises the following steps that (1) biomass is subjected to splitting decomposition through a two-stage type biomass continuous thermal decomposition device to generate biomass charcoal; (2) after the biomass charcoal is mixed with coal, a mixture enters a coal pulverizer and is pulverized into coal powder with the particle size of 20-50 [mu]m under the rotation speed of 25-100r / min, the pulverized coal powder mixed with the biomass charcoal enters a coal powder chamber and passes through a powder feeding machine and burns in a coal powder boiler through a coal powder burner, and heat supplying or power generation towards outside is realized; and (3) smoke discharged by coal power boiler in the step (2) is sampled through special equipment, the abundance of Carbon-14 inthe sample smoke is detected to determine the actual proportion of the biomass. According to the biomass and coal coupling burning method, the biomass and the coal burn in the coal powder boiler efficiently, and biomass and coal coupling burning proportion is obtained by detecting the content of the Carbon-14 in the smoke.

Description

technical field [0001] The invention belongs to the technical field of biomass thermal energy conversion and utilization, and in particular relates to a method for coupled combustion of biomass and coal. Background technique [0002] With the global energy and environmental issues becoming increasingly prominent, the development and utilization of renewable energy has received more and more attention. Biomass energy is a form of energy in which solar energy is stored in biomass in the form of chemical energy, which comes directly or indirectly from the photosynthesis of plants. As a renewable clean energy, biomass energy has attracted increasing attention for its efficient utilization. my country is rich in biomass resources, so it is of great strategic significance to strengthen the development and utilization of biomass energy. [0003] Biomass and coal co-firing technology is one of the important ways of biomass utilization. Since my country is a large agricultural cou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23K1/00F23N1/00C10B53/02
CPCC10B53/02F23K1/00F23K2201/1006F23K2201/501F23N1/00Y02E50/10
Inventor 雷廷宙李在峰任伟光杨树华何晓峰李自杰岳增合齐天郜毅孙堂磊
Owner ENERGY RES INST CO LTD HENAN ACADEMY OF SCI