Boiler decoking agent

Abstract

The invention relates to a decoking agent capable of reducing and removing coke blocks and deposited ash which are positioned in a coal burning boiler and an industrial boiler. The decoking agent comprises the following components in percentage by weight: 3%-10% of potassium nitrate, 1%-5% of magnesium nitrate, 0.5%-2% of cupric nitrate, 5%-20% of ammonium sulfate, 0%-2% of picric acid and 0%-2% of borax. According to the decoking agent, an copper ion is a combustion-supporting catalyst, and can reduce the ignition point of deposited carbon and promote the sufficient combustion of coal powder; borax can crisp the coke blocks, promote the combustion of carbon contained in the coke blocks and realize the falling of the coke blocks; the nitrate is an oxidizing agent, can release oxygen for combustion support under the condition of high temperature and can clean coke and the deposited ash by synergically generating explosion effect with picric acid. The decoking agent disclosed by the invention has the advantages of low cost and easiness for obtaining of raw materials, simple preparation process and convenience for use without causing any corrosion or generating any secondary pollution on the boilers.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a liquid 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 exchange efficiency of the boiler decreases, the exhaust gas temperature increases, the power generation efficiency decreases, and the coal consumption increases. Moreover, the heating surface is prone to sulfate corrosion due to severe coking, ...

AI Technical Summary

Problems solved by technology

The unreasonable distribution ratio of the effective components of the decoking agent product may reduce the ash melting point of the coal ash, soften the coal slag, and the decoking effect is not obvious; and the chloride salt can cause high-temperature corrosion of the furnace heating pipe under high temperature conditions, shortening the use of the boiler life; the use of rare earth oxides will increase the cost of decoking agents, and the source of raw materials is scarce; chromium-based slag and dust removal agent is a relatively common soot removal agent that contains a certain amount of chromium oxide and other related components Chromium oxide is a high-temperature refractory substance. 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 chromium salt, which has a strong oxidizing effect and is harmful to human skin and mucous membranes. Strong toxicity, 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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