Treatment method for low-temperature methanol washing exhaust gas

A technology of low-temperature methanol washing and treatment method, which is applied to fixed tubular conduit components, heat exchanger types, lighting and heating equipment, etc., can solve problems such as energy waste, and achieve the effect of saving consumption and increasing discharge temperature

Inactive Publication Date: 2018-01-26
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a treatment method for low-temperature methanol scrubbing tail gas to solve the technical problem of energy waste in the prior art

Method used

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  • Treatment method for low-temperature methanol washing exhaust gas
  • Treatment method for low-temperature methanol washing exhaust gas
  • Treatment method for low-temperature methanol washing exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Taking the low-temperature methanol washing process of 600,000 tons of methanol in Dalian University of Technology as an example, the following methods are used: image 3 The shown heat exchange box performs heat exchange on low-temperature methanol scrubbing tail gas, and the data are shown in Table 1.

[0029] Table 1

[0030]

[0031] (1) Increase the discharge temperature to 45°C, and the energy that can be recovered per year (8000 hours) is calculated as follows:

[0032] 165934kg / h×(45-15)×0.8842kJ / kg.K×8000h=35212522272kJ / a

[0033] Equivalent standard coal: (35212522272kJ / a) / 7000×4.18=120.34t standard coal

[0034] (2) The cooling capacity recovered each year can recover condensed water (the specific heat of water is 4.2kJ / kg, and the condensed water is reduced from 85°C to 45°C)

[0035] (35212522272kJ / a) / 4.2kJ / kg*(85-45)=209598t

[0036] That is, 210,000 tons of desalted water can be recovered every year.

[0037] (3) Raising the discharge temperature ...

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Abstract

The invention discloses a treatment method for low-temperature methanol washing exhaust gas. The treatment method comprises the following steps: washing the low-temperature methanol washing exhaust gas with water by using a water washing tower, and carrying out heat exchange on the washed low-temperature methanol washing exhaust gas used as a cold source and condensate water and / or a low-grade heat source. The low-temperature methanol wash exhaust gas is utilized as the low-temperature cold source to exchange heat with the condensate water or the low-grade heat source, so the discharge temperature of the low-temperature methanol wash exhaust gas is increased, and recovery of the low-grade heat source and condensate water in enterprises and saving of the use amount of desalinated water arerealized in order to achieve the purposes of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the field of coal chemical purification, in particular to a treatment method for low-temperature methanol washing tail gas. Background technique [0002] The low-temperature methanol washing process uses methanol as an absorbent, and uses methanol to convert H in the gas under high pressure and low temperature. 2 S, CO 2 And all kinds of organic sulfur have great solubility and absorption, while for CO and H 2 The characteristics of low solubility and absorption are used to remove impurities such as acid gas in the shift gas, and the total sulfur content of the purified gas at the outlet section is strictly controlled below 0.1ppm, which absorbs H 2 S, CO 2 And the rich methanol after various organic sulfur and other impurities are subjected to decompression analysis, gas stripping and heating, and recycled after regeneration. During this process, ammonia compressor refrigeration is used to provide cooling capacity for low-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14F28D7/16
Inventor 雷朝红赵建怀李晓艳杨永涛王海骞鲍胜俭
Owner CHNA ENERGY INVESTMENT CORP LTD
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