Coal-fired steam negative-pressure circulation high-pressure boiler

Abstract

The invention belongs to the technical field of boiler devices and particularly relates to a coal-fired steam negative-pressure circulation high-pressure boiler. The boiler comprises an inner boiler wall and an outer boiler wall, wherein the outer boiler wall is sleeved outside the inner boiler wall, a thin-wall water storage cavity is formed between the side wall of the inner boiler wall and the side wall of the outer boiler wall, a steam drum is formed between the top wall of the inner boiler wall and the top wall of the outer boiler wall, a combustion chamber is formed inside the inner boiler wall, a steam outlet is arranged on the top wall of the outer boiler wall, a steam return port is arranged at the bottom of the side wall of the outer boiler wall, a coal inlet, a fire bar tube and a slag removal port are arranged at the bottom of the side wall of the outer boiler wall sequentially from top to bottom, the coal inlet and the slag removal port are communicated with the combustion chamber, two ends of the fire bar tube are fixed on the side wall of the inner boiler wall, a gas pipe layer, a middle combustion tray, a combustion layer and a top combustion tray are arranged above the coal inlet inside the combustion chamber sequentially from bottom to top, a chimney is arranged at the top of the inner boiler wall, and the top of the chimney penetrates through the top wall of the outer boiler wall. The boiler is high in heat utilization efficiency, saving in coal and fast in temperature rising.

Description

technical field

[0001] The invention belongs to the technical field of boiler equipment, in particular to a coal-fired steam negative pressure cycle high-pressure boiler. Background technique

[0002] The boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy in fuel, electrical energy, heat energy of high-temperature flue gas, etc. After the conversion of the boiler, steam, high-temperature water or organic heat carrier with certain heat energy are output to the outside. In industrial production, high-pressure hot steam is often required to heat materials or maintain reaction conditions, and coal-fired steam high-pressure boilers, as a common form, have also been more and more widely used. Due to structural design reasons, the coal-fired boilers in the prior art have a small internal heat exchange surface, which leads to low heat utilization efficiency, slow temperature rise, and slow steam increase, which increase...

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