System and method for preventing low-temperature corrosion of coal-fired boiler pipeline
A low-temperature corrosion, coal-fired boiler technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as no feasible prevention of low-temperature corrosion of boiler pipes, and achieve a high degree of automation, accurate detection, and prevention. The effect of low temperature corrosion
Pending Publication Date: 2021-03-02
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology
[0004] However, there is currently no practical way to prevent low-temperature corrosion of boiler tubes
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[0024] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0025] A system for preventing low-temperature corrosion of coal-fired boiler pipes according to the present invention, comprising an alkali agent spraying system 7 and SO 3 Removal of SO by spraying alkaline agent composed of 6 on-line monitoring equipment 3 system;
[0026] The alkali agent spraying system 7 is arranged at the entrance of the SCR system 2;
[0027] Wherein, the alkali agent spraying system 7 is composed of an alkali agent spray gun 8, an alkali agent storage tank 10, a pump 9, and a PLC automatic adjustment control system 11;
[0028] The alkali agent that sprays in the alkali agent spraying system 7 refers to sodium carbonate, sodium bicarbonate, calcium oxide etc. 3 Solution or powder of alkaline substances with removal effect;
[0029] The PLC automatic adjustment co...
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The invention relates to the field of environmental protection, in particular to a system and a method for preventing low-temperature corrosion of a coal-fired boiler pipeline. The system comprises analkaline agent spraying and SO3 removing system arranged on a boiler, the alkaline agent spraying and SO3 removing system comprises an alkaline agent spraying system and SO3 online monitoring equipment; the alkaline agent spraying system is arranged at an inlet of an SCR system of the boiler; the SO3 online monitoring equipment is arranged at an outlet of an SCR system of the boiler, and the dataoutput end of the SO3 online monitoring equipment is connected with the data input end of a boiler flue gas automatic detection system; the alkaline agent spraying system comprises an alkaline agentspray gun, an alkaline agent storage tank and a pump which are sequentially connected with an alkaline agent spray gun, and a PLC automatic adjustment control system connected to the input end of a pump; and the alkaline agent spray gun is arranged at an inlet of the SCR system. The device is reasonable in design and simple in structure, can effectively prevent the problem of low-temperature corrosion of flue gas to a boiler pipeline, can monitor the emission concentration of SO3 in purified flue gas, and realizes up-to-standard emission of SO3 in purified flue gas.
Description
technical field [0001] The invention relates to the field of environmental protection, in particular to a system and method for preventing low-temperature corrosion of coal-fired boiler pipes. Background technique [0002] SO 3 It is one of the important sources of atmospheric PM2.5 and the main cause of acid rain. Coal-fired boilers emit SO into the atmosphere 3 Toxic gas is not conducive to the sustainable development of human beings and the environment. [0003] When the coal-fired flue gas passes through the SCR denitrification reaction system, the SO in the flue gas 2 It will be catalyzed by vanadium pentoxide in the SCR system catalyst to generate SO 3 (This is coal-fired flue gas SO 3 One of the important ways to generate). And after the flue gas passes through the SCR denitrification system, when it flows through the air preheater and the flue gas cooler to cool down, almost all of the SO 3 will be converted into H 2 SO 4 . The temperature is low enough tha...
Claims
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IPC IPC(8): B01D53/78B01D53/50B01D53/34
CPCB01D53/78B01D53/50B01D53/346
Inventor 付康丽赵瀚辰姚明宇王定帮陆续杨嵩杨成龙程广文蔡铭
Owner XIAN THERMAL POWER RES INST CO LTD