Self-cleaning type coal-to-gas boiler

Abstract

The invention relates to a self-cleaning type coal-to-gas boiler which comprises a solid fuel gasifying system, a mixed gas combustion system, an indirect heat exchange system and a flue gas purifyingsystem. In the device, processes of accumulating and burning solid fuels, generating gas by controlling oxygen and decoking in water bath are adopted for realizing deep processing and utilization ofsolid fuels; mixed gas combustion is adopted for realizing energy conservation of boiler; folded absorption of serial acid-base molecules is adopted for purifying flue gas; micro-molecule permeation desorption is adopted for realizing removal of adsorbate and derivation of compound ammonium. In the self-cleaning type coal-to-gas boiler provided by the invention, due to optimal utilization for solid fuels and deep treatment for fuel gas, energy-saving transformation of coal-fired boiler can be realized, the treatment for flue gas pollutants can be realized, and meanwhile, flue gas pollutants can be turned into wealth from waste, and a compound ammonium fertilizer and tar can be derived.

Description

technical field [0001] The invention relates to the field of energy conservation and environmental protection, in particular to a self-cleaning coal-to-gas boiler used for efficient combustion of scattered coal and pollution control. Background technique [0002] The traditional loose coal combustion is a method of directly burning coal through a simple stove. The disadvantages of this combustion method are: 1. The waste of fuel is serious. Due to the use of the original pile combustion method, the ratio of the combustion interface to the amount of circulating air Unreasonable deployment leads to low flame temperature, incomplete combustion of fuel, and waste of fuel; 2. Low heat utilization rate. Due to the use of the original pile combustion method, the circulation and emission of flue gas are pushed by their own thermal expansion force, and the temperature of the flue gas discharged outside 3. The amount of pollutants produced is large. Due to the lack of corresponding sm...

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Problems solved by technology

[0002] The traditional loose coal combustion is a method of directly burning coal through a simple stove. The disadvantages of this combustion method are: 1. The waste of fuel is serious. Due to the use of the original pile combustion method, the ratio of the combustion interface to the amount of circulating air Unreasonable deployment leads to low flame temperature, incomplete combustion of fuel, and waste of fuel; 2. Low heat utilization rate. Due to the use of the original pile combustion method, the circulation and emission of flue gas are pushed by their own thermal expansion force, and the temperature of the flue gas discharged outside 3. The amount of pollutants produced is large. Due to the lack of corresponding smoke and dust removal facilities and low-altitude emissions for direct combustion, it is easy to cause large-scale low-altitude pollution.

[0004] At present, many methods have emerged in the process of controlling scattered coal pollutants. Representative and large-scale implementations include "coal to gas" method, "coal to electricity" method, biomass pellet fuel substitution method, and clean briquette coal substitution method. The use of these methods has achieved certain results from simple pollution control, but the disadvantages are not worth the candle in terms of overall benefits. Practice has proved that the use of the above methods is only a transition to achieve environmental governance.

Some rural areas and small industrial boilers implement coal-to-electricity and coal-to-gas conversions. Although coal-to-coal replacement can be effectively reduced, it does not have a demonstration effect. Involving gas source, gas pipeline laying, etc., and large-scale expansion of gas field mining will have an uncertain impact on the geological structure of the gas source area. Increased pressure and, to some extent, changes in the way people live, stoking resentment and deviating from the vision of political harmony

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