Coal chemical industry solid waste drying tail gas treatment device and treatment method

Abstract

The invention belongs to a coal chemical industry solid waste drying tail gas treatment device and treatment method. The device comprises a drying machine, a dry ash discharging device is arranged atthe tail end of the drying machine, the bottom of the dry ash discharging device is connected to a finished product warehouse through a dry ash conveying device, a gas outlet in the top of the dry ashdischarging device is connected to a peculiar smell absorption tower through a dust removal unit, a gas phase outlet of the peculiar smell absorption tower is connected to a flue gas condensate collector through a gas-gas heat exchanger tube, a gas phase outlet of the flue gas condensate collector is connected to an outer cylinder of a sleeve type chimney, a shell pass inlet of the gas-gas heat exchanger is connected to an air outlet of a system air cooler through a first tee joint, and a second tee joint and a system induced draft fan are arranged between a gas phase outlet of the flue gas condensate collector and the outer cylinder of the sleeve type chimney. The system has the advantages of energy conservation, environmental protection, high resource utilization rate, low environmentalinfluence rate, stable operation, low cost and capability of realizing white smoke removal of tail gas.

Description

technical field [0001] The invention belongs to the technical field of chemical solid waste treatment, and in particular relates to a coal chemical solid waste drying tail gas treatment device and treatment method. Background technique [0002] The new entrained entrained gasification technology has become the mainstream process in the coal chemical industry. The entrained entrained bed process has a high carbon conversion rate, and the waste water generated can be directly treated in daily life. However, the solid waste generated by it is difficult to deal with, mainly due to gasification coarse residue and gasification filter cake. (Fine slag) The resource utilization rate is not high; with the development of technology, scholars have realized that the components of gasification ash slag are CaO, SiO 2 The composition is high, but it contains a certain amount of residual carbon at the same time, resulting in a high loss on ignition, so it is not suitable for use as the mai...

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Problems solved by technology

[0002] The new entrained entrained gasification technology has become the mainstream process in the coal chemical industry. The entrained entrained bed process has a high carbon conversion rate, and the waste water generated can be directly treated in daily life. However, the solid waste generated by it is difficult to deal with, mainly due to gasification coarse residue and gasification filter cake. (Fine slag) The resource utilization rate is not high; with the development of technology, scholars have realized that the components of gasification ash slag are CaO, SiO 2 The composition is high, but it contains a certain amount of residual carbon at the same time, resulting in a high loss on ignition, so it is not suitable for use as the main material of concrete; but after the experimental proportioning, it can be used as an auxiliary material in the range of 5-13% to enter the cement Or commercial mixing stations; with the development of the national economy, real estate and high-speed rail construction, a large amount of cement needs to be used. According to the statistics of the association, my country's cement production capacity is about 2.7 billion tons, and the annual output of coal chemical solid waste is about 200 million tons. At present, the mainstream ash treatment idea is landfill, and a large amount of coal chemical ash solid waste has accumulated into a huge slag field. Therefore, it is a promising market to turn coal chemical ash into cement materials, and it has far-reaching environmental protection. and economic benefits

However, due to the high moisture content of gasification ash, which is 25%-50% on average, the ash must be dehydrated in the early stage of utilization. The conventional and feasible process route is mechanical pressing + drying with a dryer. After accounting, the process can be improved by 10% The rate of return has become the mainstream process for some enterprises to deal with ash solid waste. However, whether it is dried by hot air or steam dryer, for gasified ash, the residual moisture in the ash contains 100% COD. -300mg / L, ammonia nitrogen is 100-250mg / L, and the length of the white feather tail is 70-80m when discharged; the above-mentioned white smoke and volatile odor cannot meet the requirements of environmental protection testing

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