Treatment method of sewage containing coal tar

Abstract

The invention relates to a treatment method of sewage containing coal tar, which is particularly suitable for a process for preparing Lan carbon. Raw material water passes through a sewage vaporization system WG to obtain steam which then enters a sewage gas generating part S10; and coal gas 2G is produced in a condition that an oxidant and a carbon raw material exist, and the coal gas enters a separation part S2 of the coal gas produced in the Lan carbon preparation process. The carbon raw material of the sewage gas generating part S10 can be either formed coke prepared from powered Lan carbon or a coal tar separator, i.e., coal pitch. The treatment method is integrated with a Lan carbon preparation process to form an environment-friendly, large-scale, chemical-engineering-oriented and circular-economy-type coal conversion process route with low investment, high utilization rate of raw materials and high product value. Because the coal and the oxidant are used as raw materials, three products, i.e. coal gas, coal tar and Lan carbon, are obtained.

Description

technical field [0001] The present invention relates to a method for utilizing coal-tar-containing sewage; in particular, the present invention relates to a method for utilizing coal-tar-containing sewage produced during the raw gas cooling process of a semi-coke device. After the water component of coal-tar-containing sewage is gasified As a gasification agent, coal gas is produced in the presence of oxidants and charcoal, and it is processed and utilized in conjunction with raw coal gas from a semi-coke device; more particularly, the present invention relates to a co-production of semi-coke with non-caking coal or weakly caking coal lump coal as raw material, Coal tar and coal gas are environmentally friendly, low energy consumption, high yield, and low pollutant emission coal conversion process. The carbon raw materials used in the gas production process of coal tar-containing sewage can be coke and coal tar made from powdered semi-coke asphalt. Background technique [0...

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Problems solved by technology

[0010] ① The selectivity of incineration targets is extremely poor: in the incinerated oily sewage, the weight concentration of non-combustible components (mainly water components) usually exceeds 97%, and the weight concentration of combustibles is only less than 3%;

[0011] ②Extremely low energy utilization rate: When the incineration flue gas is discharged into the ambient atmosphere, compared with the liquid water component in the oily sewage, the water vapor component in the flue gas has only latent heat, which is 9.715 million kcal / hour (accounting for 9.715 million kcal / hour of fuel combustion heat 40%), considering the heat carried by non-water components in the hot flue gas, the heat utilization efficiency of "sewage incineration and its heat recovery system" is at most about 55%;

[0012] ③ Serious waste of energy level: Sewage incineration and its heat recovery system (generating steam), from the perspective of fuel heat energy level utilization, has formed a huge waste: the use of high energy level and low calorific value syngas components (H 2 components and CO components) to generate heat; by comparing with low-energy fuels that generate steam from coal combustion, this shortcoming will be clearly revealed; the value is 1.5 to 2.0 yuan / Nm 3 The calorific value of hydrogen is 2500kcal / Nm 3 , compared with coal with a calorific value of 5000kcal / kg worth 0.2 yuan / 0.5kg, the value is 7.5 to 10.0 times different;

[0014] ④ Material recycling rate is zero: all the flue gas is discharged into the atmosphere, and no components are recovered

[0034] Method of the present invention has no report

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