Circulation fixing bed split phase combustion technology

A combustion method and fixed bed technology, which is applied in the field of fixed bed coal-fired boilers, can solve problems such as difficult desulfurization and manufacturing difficulties, and achieve the effects of reducing desulfurization costs, improving ventilation, and improving desulfurization effects

Inactive Publication Date: 2011-06-08
GUOHUI ENVIRONMENTAL PROTECTION NEW ENERGY
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  • Abstract
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Problems solved by technology

The chain furnace is limited by the combustion method of the fixed bed. The thermal efficiency is generally between 70% and 85%.
Due to the influence of chain manufacturing technology, there are difficulties in manufacturing chain furnaces larger than 100T / h (it is reported that the maximum is 120T / h currently on the market)

Method used

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  • Circulation fixing bed split phase combustion technology
  • Circulation fixing bed split phase combustion technology

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specific Embodiment approach

[0030] Specific embodiments: the fuel of the technology of the present invention is to use wet coal particles, the raw coal is made into wet coal particles with a diameter of 15 to 50 mm and put into the furnace, and the coal particles enter the preheating zone composed of reciprocating fire grates.

[0031] The present invention is designed as a double grate boiler, the front part is a reciprocating grate 8, and the rear part is a chain grate 11; Blast, mixed with return flue gas to control the temperature of the coal seam; the burnt slag is cooled to 200°C by cold air and discharged.

[0032] Through the gas combustion zone 7 at the upper end of the upper arch 20, the flue gas, combustible gas, and hot air after the tail heating are gas-phase combusted, which is also the secondary combustion of the flue gas. The flue gas after the secondary combustion is burned three times and four times. Exhaust the wind to support the combustion, and the combustible gas is completely burne...

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Abstract

The present invention relates to combustion operating method for fixed bed coal burning boiler and the special boiler. Coal grains of 15-50 mm size are first preheated with high temperature fume to 300-500 deg.c and then burnt in the main combustion area at 850-950 deg.c in the blown air comprising fresh air and tail fume; and cold air is introduced near the slag tap of the boiler to control slagtemperature at 60-200 deg.c. The method of the present invention is especially suitable for chain-grate boiler, can burn raw coal of heat value 2000-6000 cal / kg and certain amount of industrial wastewater and city refuse, and has high heat efficiency.

Description

Technical field: [0001] The invention relates to a fixed-bed coal-fired boiler, in particular to a phase-separated combustion operation method of a wet coal particle circulation fixed-bed coal-fired boiler and a special-purpose layer-fired boiler. Background technique: [0002] Fixed bed combustion is a very old combustion technology. In recent years, with the advancement of science and technology, many improvements have been made in automation and scale, but the basic combustion method has not changed much. At present, chain furnaces are most widely used in fixed beds. The chain furnace is limited by the fixed bed combustion method, the thermal efficiency is generally between 70% and 85%, and the calorific value of coal combustion must reach more than 4500 kcal, and it is generally difficult to achieve desulfurization in the furnace. Due to the influence of chain manufacturing technology, there are difficulties in manufacturing chain furnaces larger than 100T / h (it is repo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23B90/04
Inventor 苏壮强
Owner GUOHUI ENVIRONMENTAL PROTECTION NEW ENERGY
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