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Coal tar fractional condensation method and device
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A graded condensation and coal tar technology, applied in gas purification of condensed non-gaseous materials, petroleum industry, combustible gas purification, etc., can solve problems such as difficult recovery of high temperature sensible heat, separation of difficult oil products by grade, etc.
Pending Publication Date: 2020-10-27
EAST CHINA UNIV OF SCI & TECH
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[0006] The technical problem to be solved by the present invention is to provide a new method and device for coal tar graded condensation in order to overcome the defects of the prior art that it is difficult to separate oil products by grade and recover high temperature sensible heat.
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[0074] Such as figure 1 The shown coal tar graded condensation device includes an oil-containing pyrolysis gas delivery pipeline 10, a primary condenser 20, a primary separator 30, a secondary condenser 40, a secondary separator 50, and a tertiary condenser 60, The third-stage separator 70, the fourth-stage condenser 80 and the fourth-stage separator 90; the first-stage condenser 20, the second-stage condenser 40, the third-stage condenser 60 and the fourth-stage condenser 80 are partition wall heat exchangers; The pyrolysis gas delivery pipeline 10 is sequentially connected with the thermal fluid channel of the primary condenser 20, the primary separator 30, the thermal fluid channel of the secondary condenser 40, the secondary separator 50, the thermal fluid channel of the tertiary condenser 60, The hot fluid channel of the three-stage separator 70, the four-stage condenser 80 communicates with the four-stage separator 90; T...
[0094] (2) Method for coal tar graded condensation
[0095] Among them, in step ①, the pyrolysis temperature is 700°C, the amount of processed coal is 260t / day, and the output of pyrolysis gas is 3000Nm 3 / h; Concrete process parameter is shown in Table 2, and all the other are with embodiment 1.
[0103] (2) Method for coal tar graded condensation
[0104] Among them, in step ①, the pyrolysis temperature is 550°C, the amount of processed coal is 1300t / day, and the output of pyrolysis gas is 15000Nm 3 / h; Concrete process parameter is shown in Table 2, and all the other are with embodiment 1.
[0105] Effect data:
[0106]
[0107] In the above table, water vapor refers to the saturated water vapor generated by the first heat exchanger and the second heat exchanger.
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Abstract
The invention discloses a method and a device for fractional condensation of coaltar. The method comprises the following steps: (1) carrying out dividing wall type heat exchange on oil-containing pyrolysiscoal gas and water vapor to obtain high-distillation-range tar and first-stage pyrolysis gas; (2) carrying out dividing wall type heat exchange on the first-stage pyrolysis gas and a molten salt to obtain medium-distillation-range tar and second-stage pyrolysis gas; (3) carrying out dividing wall type heat exchange on the second-stage pyrolysis gas and heat conduction oil to obtain low-distillation-range tar and third-stage pyrolysis gas; and (4) carrying out dividing wall type heat exchange on the third-stage pyrolysis gas and cooling water to obtain light oil and tar-free pyrolysis gas, wherein in the step (1), the inlet temperature of the water vapor is 150-250 DEG C, in the step (2), the inlet temperature of the molten salt is 200-250 DEG C, and in the step (3), the inlet temperature of the heat conduction oil is 100-150 DEG C. According to the method and device, coal tar fractional condensation and pyrolysis gas purification can be achieved, and high-temperature sensible heat can be recycled.
Description
technical field [0001] The invention relates to a method and a device for coal tar graded condensation. Background technique [0002] my country's energy reserve structure is rich in coal, low in gas, and poor in oil. In 2017, coal accounted for 60.4% of the overall energy consumption structure, while in other energy consumption, oil and natural gas are highly dependent on imports. The main form of coal utilization in my country is direct combustion, accounting for about 80% of the total coal consumption. Pyrolyzing this large amount of power coal to obtain low-cost gas and tar, and sending the remaining semi-coke to boilers for combustion and power generation will greatly improve the resource utilization level and value of coal, and alleviate the shortage of oil and gas supply in my country. [0003] The existing coal pyrolysis process for preparing tar all adopts a mild method to extract liquid fuels and chemicals from coal. The main foreign representative coal pyrolysis...
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