Water cooling back smokebox for boiler

Abstract

The invention relates to a water cooling back smokebox for a boiler. The back smokebox comprises a back smokebox barrel, a fireproof layer, a back smokebox flange, a smokebox end cover, a fixed rack,a back smokebox top plate and a heat-isolating insulating layer. A water jacket interlayer is arranged between the back smokebox barrel and the smokebox end cover, and the water jacket interlayer is filled with cooling water to cool external high temperature of the back smokebox barrel; and a connecting pipe communicates to a condenser arranged above the back smokebox barrel. The water cooling back smokebox is reasonable in structure. By arranging a water cooling structure inside to cool the back smokebox through cooling water, the outer wall temperature of the back smokebox body is reduced effectively. The cooling water can be either used as in a cooling inner cycle or externally connected to inflow of a circulating boiler and take hot water, so that the technical problems that the wasteheat temperature is wasted as the back smokebox of an existing gas boiler is a dry back smokebox commonly and the service life of the back smokebox body is affected as too high temperature harms the outer wall of the back smokebox body and the like are solved. Compared with the prior art, the water cooling back smokebox has a very good market prospect and development space.

Description

technical field [0001] The invention relates to the technical field of industrial gas or oil-fired boiler equipment, in particular to a water-cooled rear smoke box for the boiler. Background technique [0002] With the development of science and technology and the improvement of people's living standards, gas boilers are more and more widely used in steam, heating, food processing and other industries. Since gas-fired boilers generally use natural gas, city gas, coke oven gas, liquefied petroleum gas and biogas as fuels, the combustion calorific value is high. In traditional boilers, after the fuel is burned in the boiler, the exhaust gas temperature is relatively high, and the water in the flue gas The steam is still in the gaseous state and will take away a lot of heat. Among all kinds of fossil fuels, natural gas has the highest hydrogen content, and the mass percentage of hydrogen is about 20% to 25%. Therefore, the exhaust smoke contains a lot of water vapor, and the co...

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Problems solved by technology

[0005] In order to solve the problem that the rear smoke box of the existing gas-fired boiler is generally a dry type rear smoke box, a high-temperature-resistant material is provided at the outlet of the smoke box, generally high-temperature-resistant concrete, etc., and the rear smoke box discharges the waste heat and waste gas after combustion, so that The utilization rate of heat energy is low, and waste heat is lost in vain. On the other hand, the excessively high temperature of waste heat will also cause damage to the outer wall of the rear smoke box, and the rear smoke box will expand with heat and contract with cold when it is exposed to excessively high temperatures for a long time reaction, affecting the service life of the rear smoke box and other technical problems, the invention provides a water-cooled rear smoke box for boilers to achieve reasonable structure, ingenious design, built-in water-cooling structure, cooling the rear smoke box by cooling water, effective To reduce the temperature of the outer wall of the smoke box, the cooling water can be used for internal circulation for cooling, and can also be used for external circulation boiler water intake, and can also be used for hot water.

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