Sludge or oily sludge drying and incineration treatment circulating system and treatment method

Abstract

The invention discloses a sludge or oily sludge drying and incineration treatment circulating system and a treatment method. The sludge or oily sludge drying and incineration treatment system comprises N dryers which are connected with one another; a feeding hole is formed in the first drying machine; a discharge port of the Nth dryer is connected with a feed port of the low-heating-value incinerator; an exhaust port is formed in the low-calorific-value incinerator and connected with each dryer through an air supplementing pipeline, a waste gas outlet is formed in each dryer, an ash outlet andan air inlet are formed in the low-calorific-value incinerator, and a cooling air inlet and a cooling adjusting fan are arranged on the air supplementing pipeline. According to the treatment method of the circulating system, high-temperature flue gas generated by sludge or oily sludge incineration is used for drying high-moisture sludge or oily sludge after being cooled, and the dried materials are fed into a low-calorific-value fuel incinerator to be incinerated to form circulation, various harmful substances are decomposed by the blast furnace, and flue gas provides drying heat for sludge or oily sludge, so that the sludge or oily sludge is subjected to reduction and harmless treatment.

Description

technical field [0001] The invention relates to an industrial furnace combustion system, in particular to a sludge or oil sludge drying and incineration treatment circulation system and treatment method. Background technique [0002] At present, the problem of environmental pollution in our country is serious. The pollution of air, water and soil seriously threatens the environment, ecology and life safety, and seriously affects the sustainable development of the country. Among them, especially the accumulation of oily sludge and sludge has reached a very serious level. [0003] At present, except for a small amount of sludge used as fertilizer, most of it is landfilled or stacked in the open. The use of industrial kiln combustion technology to treat oily sludge and sludge is still one of the few. [0004] The main reason is that the existing sludge treatment technology has the following deficiencies: 1. After the combustibles with high calorific value are dried and carbon...

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Problems solved by technology

[0004] The main reason is that the existing sludge treatment technology has the following deficiencies: 1. After the combustibles with high calorific value are dried and carbonized, the weight loss is serious due to decomposition and volatilization. It is required that the calorific value of the material is more than 2000 cal / kg to be easy to burn. The calorific value of mud or oil sludge is generally lower than 2000 cal / kg. For this reason, high-temperature hot air (hot air temperature higher than 400°C) is generally used for sludge or oil sludge to enter the dryer and carbonization furnace to remove the sludge or After the moisture content of the oil sludge is dried and carbonized to less than 20%, it is sent to the combustion furnace for combustion; because when the temperature is higher than 400°C, most of the organic matter and oil are decomposed and volatilized, and the calorific value decreases seriously (the calorific value loss can reach 60 % or more), the heat balance cannot meet the requirements of the internal circulation, it is necessary to add diesel, natural gas, coal or biomass fuel, etc., so that the comprehensive calorific value of the material reaches about 3000 cal / kg, and the furnace temperature reaches above 800°C to decompose dioxin, etc. All kinds of harmful substances, the treatment cost is extremely high, up to 300-800 yuan / ton of sludge or oil sludge; and the investment is relatively large; due to unstable furnace temperature, it is difficult to control the emission of harmful gases such as dioxin DAB; 2. High temperature heat Furnace decontamination can better solve the problem of dioxin discharge standards, but the disadvantage is that the investment is too large. The investment in disposal equipment for each ton of sludge or oily sludge is 500,000-800,000 yuan / ton, and the operating cost is also high.

[0005] The treatment of oily sludge is more complicated. Oil-water separation must be carried out first. In the existing treatment process, since most of the combustibles have been extracted, the pollutants in the remaining oily sludge are not easy to handle and even less easy to burn, resulting in high treatment costs. Each ton of oil Sludge treatment costs thousands of dollars

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