Using method of heat storage, boiling, burning, precipitation and purification device for VOCs waste gas absorbed solid waste

Abstract

The invention relates to the technical field of waste gas treatment of volatile organic compound, in particular to a using method of a heat storage, boiling, burning, precipitation and purification device for VOCs waste gas absorbed solid waste. The method is characterized in that the technical scheme of heat storage, burning and purification for twice, namely adhesion of molten salt patch based on primary heat storage, boiling, burning and cyclone separation effect and adhesion of molten salt patch based on secondary heat storage, burning and settlement separation effect, is adopted; aiming for the target of improving the burning efficiency and the purification efficiency of the VOCs waste gas absorbed solid waste, a furnace hearth, a heat storage material returning chamber and a heat storage burning settlement chamber are designed, the temperature is controlled to be 850-950 DEG C, the retention time is 5s, and the burn decrement rate of furnace slag is less than or equal to 5%.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment of volatile organic compounds, in particular to a method for using a purification device for absorbing VOCs waste gas solid waste heat storage boiling combustion sedimentation. Background technique [0002] Gaseous pollutants emitted by industry are the main source of atmospheric environmental pollutants, among which volatile organic compound waste gas (VOCs) is a gaseous pollutant that is seriously harmful to the environment, and it is also an occupational hazard that affects the health of operators in the workplace It is widely derived from chemical industries such as paints, coatings, coatings, lubricants, and rubber. Due to its huge destructive effect on the human body and the natural environment, the country has issued relevant laws and regulations to strictly control its governance and emissions. At present, the commonly used treatment methods of organic waste gas treatment tech...

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Problems solved by technology

[0003] Example 1 of the prior art uses two combustion methods to incinerate (pyrolyze) solid waste (garbage), trying to increase the residence time of the furnace and the second combustion chamber to ensure effective decomposition of pollutants. As we all know, the moisture content of garbage is relatively low. High, during the combustion process of the furnace, its moisture forms superheated steam and is discharged with the flue gas. In addition, the N in the air 2 It is also a non-combustible part, which will take away a lot of heat and cause the temperature of the furnace to drop. In other words, the heat load of garbage fuel is low, which will inevitably lead to low combustion temperature of garbage in the furnace and the secondary combustion chamber. If it is in the secondary combustion chamber (rising chamber, flue) Arranging the heating surface will not guarantee the purification conditions required by the "Standards for Pollution Control of Domestic Waste Incineration" GB 18485-2014, that is, the incineration temperature in the furnace is ≥850°C, and the residence time of flue gas at this temperature is ≥2s, which is very easy to cause difficulty in disposal Large, harmful to the environment, heavy dioxin pollutants, etc.

Moreover, the furnace and the secondary combustion chamber are far apart in the plane layout of the equipment, so particles are easily deposited in the flue connecting the two. On the one hand, it causes high-temperature corrosion of the flue; The working environment changes from negative pressure to positive pressure, allowing pollutants to leak from the furnace

The circulating fluidized bed garbage incineration boiler designed in the second example of the prior art has the following disadvantages: the first is that compared with the existing circulating fluidized bed boiler, the change is that the heating parts such as the membrane water wall in the middle and the lower part of the furnace are cancelled, so that To ensure the temperature of the furnace, the advantage is to ensure that the garbage can continue to burn (pyrolysis), and the disadvantage is that the material layer (fluidized layer) should not be too thick. A thicker material layer will store heat and burn here, resulting in uneven fluidization and local high temperature. Coking will occur, but if the material layer is too thin, the furnace temperature will not reach the effective pyrolysis temperature (≥850°C) due to insufficient thermal load of waste fuel; the second is to assume that the temperature in the lower part of the furnace reaches the effective pyrolysis temperature (≥850°C) ℃), the heat load of waste fuel is sufficient, and the middle and lower part of the furnace is not equipped with membrane water cooling wall, so the air supply volume of the air chamber is required to be increased to prevent the furnace from coking. The cost will be greatly increased, and it also means that the excess air coefficient will increase and the total amount of pollutants will be discharged. Surface metal components are washed and worn by particles, and the flue gas contains Cl - , SO 2 Pollutants such as pollutants are the main cause of high-temperature corrosion of metal components on the heating surface

Existing Art Example 3 The molten salt in the molten salt regenerator mainly acts as a heat storage and heat conductor, and it is difficult to apply it to the technical field of solid waste pyrolysis

If the multi-bed furnace designed in Example 3 of the prior art is used in the treatment of adsorbed VOCs exhaust gas solid waste, there are the following technical problems: First, the temperature of the multi-bed furnace is not high (450-650 ° C), and the solid waste is in contact with oxygen in the furnace Insufficient, partially incompletely combusted volatile organic compounds are sent to the regenerative combustion furnace for combustion with the tail gas after washing and gas-liquid separation, then the combustible components in the tail gas such as volatile organic compounds, CO, H 2 A lower ratio of equalization will inevitably lead to a reduction in the heat load of the regenerative combustion furnace, and the result will inevitably be that the temperature in the furnace will continue to drop and the combustion will stop

Second, the temperature of the multi-bed furnace is not high (450-650°C), if the characteristic pollutants contain Cl - Such as the basic components of synthetic dioxins, it will form a heavy dioxin pollutant that is difficult to dispose of and harmful to environmental pollution.

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