Fume cleaning regulating method and apparatus by indirect evaporating liquid utilizing the residual heat of fume

Abstract

A method of cleansing smokes by indirectly evaporating liquid through remaining heat of smoke and its device. The device comprises heat source, evaporating container, heat conductive member. Taking advantage of the remaining heat of smoke, liquid is evaporated by the heat conductive member. When the liquid is heated and evaporated, it greatly absorbs energy from warm smoke containing dust by the heat conductive member, the temperature of the smoke drops to an objective value. Steam from the liquid is mixed with smoke by a steam pipeline before a dust-collecting machine. In the manner, the smoke is cool, increase humidity, purified, which improve the purifying effect of the dust-collecting machine.

Description

technical field [0001] The invention relates to a method and device for conditioning and tempering dust-laden hot flue gas discharged from industries such as coal-fired power plants, building materials, metallurgy, and chemical industry, and specifically relates to the field of electric dust collection or filter bag dust collection, especially a method using Disclosed are a flue gas purification and tempering method and device for cooling and humidifying flue gas by indirectly evaporating liquid with waste heat of flue gas. Background technique [0002] With the increasingly stringent environmental emission standards, more and more original dust collectors cannot meet the requirements of smoke and dust emission standards, especially in order to reduce coal-fired SO 2 emissions, more and more coal-fired boilers are replaced by low-sulfur coal to meet the reduction of SO 2 requirements, while reducing the huge amount of SO 2 Payment of sewage charges. But what follows is th...

AI Technical Summary

Problems solved by technology

Its disadvantages are: a. What is injected into the flue gas is SO 3 , NH 3 , and other polluting gases, if there is no corresponding effective removal facility behind the electrostatic precipitator, it will be discharged along the chimney, causing new pollution to the environment; b, significantly increasing the acid dew point temperature of the flue gas, will locally cool down the follow-up equipment cause corrosion everywhere; c, high equipment investment and operating costs; d, high requirements for the control system, relatively complex

The disadvantages are: a. Large amount of solvent required and high operating costs; b. Insufficient contact between solution and dust, especially fine particles; c. Relatively complex system composition and control system, high equipment investment

But its disadvantages are: a. There must be a special spray humidification tower or a flue of sufficient length to meet the requirements of the droplet evaporation time; b. The atomized water droplets usually adopt the method of pressure atomization or two-phase flow gas-assisted atomization

Although the deficiencies of the third method are basically overcome, there are also certain disadvantages: a. The heat exchange intensity is relatively small in the way of taking heat away by the cooling medium, the heat exchanger equipment is relatively large, and the cooling medium requires a large amount ; b. To improve the dust collection efficiency, it only has the beneficial effect of reducing the flue gas temperature, but does not have the very important beneficial effect of increasing the water vapor content, so the effect of improving the dust collection efficiency is single

Although it can increase the water vapor content in the flue gas and play a positive role, its disadvantages are: a. It cannot effectively cool down the flue gas; b. The amount of water vapor required for simple humidification is large, and energy waste is serious; c. High operating cost

[0009] Summarizing the above methods, the existing technology mainly has the following defects: the equipment used is complex in structure, high in cost, does not make good use of the waste heat resources of the hot flue gas to process the dusty hot flue gas, consumes energy and electricity, and its process control requirements High and complex, poor equipment safety, many hidden dangers, unable to fully improve the dust collection characteristics of smoke and dust, making it easier to achieve standard discharge

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