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Additive inhibiting biomass boiler coking and using method thereof

A biomass boiler and additive technology, which is applied in the direction of fuel additives, biofuels, waste fuels, etc., can solve the problems of different effects and large differences in additives, etc., and achieve a reduction in heated area ash, easy to use and easy to operate, and significant anti-coking effect Effect

Active Publication Date: 2016-01-13
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is still little research on additives for suppressing boiler coking, and the additives used for different types of fuels are also quite different, and the effects are also different.

Method used

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  • Additive inhibiting biomass boiler coking and using method thereof
  • Additive inhibiting biomass boiler coking and using method thereof
  • Additive inhibiting biomass boiler coking and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The additive for inhibiting the coking of the biomass boiler provided by the present embodiment, the additive is composed of 35% kaolin, 35% CaO and 30% Mg(OH) by mass percentage 2 Composition, Kaolin, CaO and Mg(OH) 2 The particle size is 100~600 mesh particles.

[0024] The performance of the above additives was tested by an intelligent ash fusion tester produced by Changsha Kaiyuan Instrument Co., Ltd. Wheat straw was used as fuel, and the additive quality was 1% of the total mass of biomass fuel. After testing, the ash melting point of wheat straw was significantly improved. The specific data of ash melting point are shown in Table 1 (the test procedure refers to the national standard "Determination of Coal Ash Fusibility Methods", GB210, etc.).

[0025] The ash melting point data before and after adding the additive in embodiment 1 in the biomass fuel of table 1

[0026]

Embodiment 2

[0028] The difference between this example and Example 1 is that the additive for inhibiting the coking of the biomass boiler consists of 65% kaolin, 30% CaO and 5% Mg(OH) 2 Mix composition. Others are the same as in Example 1, and the specific data of the ash melting point are shown in Table 2.

[0029] The ash melting point data before and after adding the additive in embodiment 2 in the biomass fuel of table 2

[0030]

Embodiment 3

[0032] The difference between this example and Example 1 is: the additive for inhibiting the coking of the biomass boiler consists of 40% kaolin, 40% CaO and 20% Mg(OH) 2 Mix composition. Others are the same as in Example 1, and the specific data of the ash melting point are shown in Table 3.

[0033] The ash melting point data before and after adding the additive in embodiment 3 in the biomass fuel of table 3

[0034]

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Abstract

The invention discloses an additive inhibiting biomass boiler coking. The additive is prepared from, by mass, 35-65% of kaolin, 30-60% of CaO and 5-35% of Mg(OH)2. When the additive is used, the addition proportion accounts for 0.5-2% of the total mass of biomass fuel. The additive can be directly mixed with biomass uniformly, then enters a combustion furnace by means of a feeding system of the boiler, and can be sprayed into a hearth uniformly along with an air inlet system, use is easy, and operation is easy. The additive has large porosity, the reaction area of the additive and the biomass fuel can be increased, pores in the surface of the additive have adsorption performance, alkali metal such as K and Na can be adsorbed to the surface of the additive effectively, the chemical reaction is carried out so that a high-melting-point substance can be generated, and ash deposition and slag bonding of the heated face are reduced; the amount of the adopted additive is small, efficiency is high, the coking resistant effect is remarkable, and the ash fusion point of the biomass can be remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of additives for suppressing coking of boilers, and in particular relates to an additive for suppressing coking of biomass boilers and a use method thereof. Background technique [0002] In my country, biomass is second only to coal in energy consumption and has become the second largest energy source, accounting for about 20% of all energy consumption. In the "Renewable Energy Medium and Long-term Development Plan", the development goal of my country's biomass power generation installed capacity reaching 30GW was determined by 2020. It can be seen that the development prospect of biomass energy is broad. [0003] However, due to the high content of alkali metal elements K, Na and non-metal elements Cl and Si in biomass fuel, silicate compounds with low melting points (usually below 680°C) are produced during combustion, and adhere to the carbon dioxide in the flue gas. Fly ash particles lead to serious co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C10L10/04C10L5/44
CPCY02E50/10Y02E50/30
Inventor 张宏亮赵莹陈天生苏伟董长青李薇
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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