System and process for utilizing coke oven flue gas desulfurization and denitrification waste heat

Abstract

The invention provides a system and process for utilizing coke oven flue gas desulfurization and denitrification waste heat. The process includes: allowing flue gas to enter an SCR denitrification reactor to react with the reducing agent, allowing the flue gas after the reaction to enter a waste heat boiler module for heat exchanging, controlling the module to allow the temperature of the flue gas to be 160-180 DEG C, allowing the flue gas to enter a magnesium desulfurization module for desulfurization, and discharging, wherein the SCR denitrification reactor is connected with an inlet flue, a guide plate is arranged at the turning part of the flue, a rectifying grating is arranged on the upper portion in an SCR denitrification reactor shell, a catalyst layer is arranged below the rectifying grating, and a steam soot blower is arranged between the rectifying grating and the catalyst layer; the catalyst is a vanadium-titanium-based catalyst and / or a rare-earth-system low-temperature catalyst; volume velocity is controlled to be 5000-8000m<3> / m<3>. H, and flue gas speed is controlled to be 3-10m / s; the waste heat boiler module is a heat pipe waste heat boiler. The process has the advantages that the nitrogen oxide and sulfide in the coke oven flue gas are removed successfully, the flue gas waste heat is utilized to the maximum extent, and the economy of the system is increased.

Description

technical field [0001] The invention relates to a waste heat utilization process and system for flue gas desulfurization and denitration, in particular to a waste heat utilization process and system for coke oven flue gas desulfurization and denitrification. Background technique [0002] In recent years, severe smog has often occurred in many places in the north, especially the Beijing-Tianjin-Hebei region. This intensified air pollution has attracted widespread attention from the country and the whole society. Effective control of air pollution has become the consensus and expectation of all walks of life. [0003] During the period from the 12th Five-Year Plan to the 13th Five-Year Plan, my country has promulgated and revised a large number of current environmental protection laws and regulations, making air pollution emission standards in various fields increasingly strict. Against this background, the coking industry, which was basically in a state of disorderly discharg...

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Problems solved by technology

Same as CN104923046A, this case also has the technical problem of requiring a large amount of energy to heat the waste gas, which makes the system consume extremely high energy consumption, causing secondary environmental pollution and greatly increasing operating costs

In addition, there is no system in this process that can complete the pressure matching to ensure the original negative pressure state of the flue, and it is difficult to meet the stringent requirements and high safety requirements of the coke oven for the pressure of the flue gas system

[0006] In the systems and processes that domestic enterprises have or plan to adopt, due to the limitations of process methods or catalyst conditions, there are four common problems: first, the denitrification process has low efficiency and cannot fully meet the needs of coke oven production; second, the general needs Heating the flue gas produces a large amount of energy consumption and wastes energy; the third is that the process flow is not reasonable and smooth, and is not the optimal solution in line with the principle of reaction; the fourth is that the safety of the coke oven flue gas system cannot be effectively guaranteed

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