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Coke inhibitor and application thereof in biomass power generation boiler

A technology for biomass power generation and coke inhibitor, which can be used in fuel additives, petroleum industry, fuels, etc., and can solve problems such as limiting boiler efficiency improvement, high water content, and high viscosity

Active Publication Date: 2021-03-16
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Take chicken manure and rice husk as an example of biomass mixed fuel, which has high water content and higher viscosity than ordinary biomass. The fly ash produced by combustion is mainly KCL and potassium sulfate. The flue gas of this fly ash is mainly Viscosity is high, it is easy to adhere to the heating surface of the heat exchanger of the boiler, and it can continuously accumulate, solidify, coke and slagging on the heating surface, causing serious ash accumulation, reducing the heat transfer efficiency of the boiler, and shortening the boiler's service life. The operating cycle greatly limits the efficiency improvement of the boiler
In addition, the accumulated ash is easy to solidify and coke, and it is not easy to fall off on the steel pipe of the heat exchanger, which also brings a lot of workload and safety hazards to the manual cleaning of the subsequent shutdown, seriously affecting the economic and social benefits of boiler power generation

Method used

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  • Coke inhibitor and application thereof in biomass power generation boiler
  • Coke inhibitor and application thereof in biomass power generation boiler
  • Coke inhibitor and application thereof in biomass power generation boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Embodiment 1 (comparative example)

[0114] The biomass fuel that present embodiment adopts is the mixture (wherein paddy husk content is 70wt%, and chicken manure content is 30wt%) of wet chicken manure and paddy husk mixture without drying, and its average water content is 40.1wt% (because input every day The moisture content of the biomass will be different due to the influence of climate and transportation factors, so it is represented by the range); the biomass fuel is applied to the chicken manure circulating fluidized bed power generation boiler for incineration and power generation. After long-term operation monitoring, the results show that The continuous normal operation period of the boiler system is 30 days. The ash accumulation and coking on the superheater is serious. The ash deposits in the superheater are mainly composed of KCl, potassium sulfate and calcium chloride alkali phosphate, and the ash deposits at the bottom of the furnace are less, accounting...

Embodiment 2

[0117] The difference between this embodiment and Example 1 is that the biomass fuel is added with a coke inhibitor, which includes coke inhibitor chemicals and quartz sand, and the particle size of the quartz sand is 0.2-0.8mm; the components of the coke inhibitor chemicals It is: calcium sulfate; in this embodiment, the anti-coking chemical accounts for 0.25% of the mass proportion of the raw material fuel, and the weight fraction of quartz sand relative to the raw material fuel is 0.05-0.025wt%. After the coke-resisting chemical with the above ratio is crushed until the maximum particle size is less than 0.8mm, it is evenly mixed with biomass fuel and sent to the power generation boiler for combustion; after the boiler starts normal operation, the quartz sand is simultaneously released from the biomass boiler separator The openings on both sides of the horizontal flue at the exit, the openings on both sides of the high temperature superheater area, the openings on both sides...

Embodiment 3

[0120]The difference between this embodiment and Example 1 is that the biomass fuel is added with a coke retarder, which includes a coke retarder chemical and quartz sand, and the quartz sand is 26 to 13wt% (quartz) relative to the weight of the entire coke retarder. The content of sand in the anti-coking agent changes dynamically every day), and the particle size of quartz sand is 0.2-0.8mm; the components and molar ratio of anti-coking chemicals are:

[0121] Calcium sulfate: 16 parts;

[0122] Calcium oxide: 63 parts;

[0123] Magnesium phosphate: 21 parts (based on the molar amount of phosphorus element);

[0124] Quartz sand: 26wt% ~ 13wt%

[0125] After crushing the above-mentioned anti-coking chemicals to a maximum particle size of less than 0.8mm, they are evenly mixed with quartz sand and biomass fuel and then sent to the incineration furnace of the power generation boiler for combustion; the amount of quartz sand in the coking inhibitor Decrease day by day with th...

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Abstract

The invention discloses a coke inhibitor and application thereof in a biomass power generation boiler. The coke inhibitor comprises a gas coke inhibition chemical, wherein the gas coke inhibition chemical is selected from at least one of acetylene, natural gas, ethylene, coal gas and petroleum gas. Potassium sulfate and potassium chloride which are easy to coke and slag can be effectively fixed and converted into loose and fragile mixed substances which are not easy to coke and slag, the coking and slag-bonding process can be effectively blocked, and the coking and slag-bonding conditions of the heating surface of the boiler can be eliminated or relieved.

Description

technical field [0001] The application relates to a coking inhibitor and its application in biomass power generation boilers, belonging to the technical field of biomass power generation boilers. Background technique [0002] With the rapid development of the livestock and poultry breeding industry, a large amount of livestock and poultry breeding waste generated by this industry has become one of the three major non-point sources of agricultural pollution. It is an effective way to solve the pollution of livestock and poultry breeding waste by using livestock and poultry breeding waste as biomass fuel to generate electricity. At present, the device and process flow of the power generation boiler for livestock and poultry farming waste are all borrowed from the conventional coal-fired power generation boiler. However, the fuel properties and components of livestock and poultry farming waste are very different from coal, so that the ash components and properties produced by ...

Claims

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Application Information

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IPC IPC(8): C10L10/02C10L10/04
CPCC10L10/02C10L10/04C10L2270/04
Inventor 吴初新张永亮官轮辉侯鲲官俊付建兴
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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