A boiler decoking agent

Abstract

The invention provides a clinker removal agent which is used for reducing and clearing coke blocks and deposited dust in a coal-fired boiler and an industrial boiler. The clinker removal agent comprises the following components in percentage by weight: 30%-50% of aluminium nitrate, 30%-40% of borax, 15%-20% of copper nitrate and 5%-10% of ammonium nitrate. According to the invention, copper ion in the clinker removal agent is a combustion-supporting catalyst and is capable of reducing the fire point of the deposited dust so as to promote the combustion of coal powder; the borax can crisp the coke blocks so as to promote the combustion of carbon in the coke blocks and simultaneously realize the drop of the coke blocks; and the nitrate is an oxidant, can release oxygen for support combustion at high temperature, and can also generate 'microexplosion' effect, thereby clearing the coke and deposited dust. The additive has cheap and available raw material and simple preparation process, is convenient for use, dose not result in any corrosion of the boiler and dose not produce secondary pollution.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a decoking agent for reducing and removing coke blocks and ash deposits in coal-fired boilers and industrial boilers. Background technique [0002] Due to the high heat intensity and high combustion temperature of coal-fired boilers, under the influence of various complex factors such as unreasonable boiler design, improper operation, or changes in coal quality, it is easy to form serious coking and ash accumulation, and often need to be shut down Furnace decoking and ash removal bring significant economic losses to production enterprises. During the coal combustion process, due to the ash and coking of the heated area, the heat transfer efficiency of the boiler decreases, the exhaust gas temperature increases, and the energy consumption increases. And the heating surface is prone to sulfate corrosion due to severe coking, shortening the service life of the boiler, etc. [00...

AI Technical Summary

Problems solved by technology

At present, the active ingredient ratio of many decoking agent products is unreasonable, which reduces the melting point of coal ash, softens the cinder, and has no obvious decoking effect; under high temperature conditions, chloride salts can cause high-temperature corrosion of furnace heating pipes and shorten the service life of boilers; The use of rare earth oxides will increase the cost of additives, and the source of raw materials is scarce; chromium-based slag and dust removal agent is a relatively common dust removal agent, which contains a certain amount of chromium oxide and other related components. Chromium oxide It is a high-temperature refractory substance, and it is beneficial to increase the melting point of coal ash after being added to the agent

However, the biggest problem with this agent is that chromium salt has a strong oxidizing effect, which is highly toxic to human skin and mucous membranes, and will cause heavy metal pollution in slag water.

From the perspective of the health of operating personnel and environmental protection, this highly toxic agent should be used with caution

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