Gas naphthalene washing process in primary-cooling working procedure of coke oven gas purification unit

A purification unit and coke oven gas technology, which is applied in combustible gas purification, combustible gas purification/transformation, petroleum industry, etc., can solve problems such as high energy consumption, complicated process flow, and many equipment, so as to reduce process energy consumption and operation The effect of simplicity and a small number of equipment

Active Publication Date: 2010-01-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The naphthalene washing method comprises a two-stage naphthalene washing process of initially cold washing naphthalene and final cold washing naphthalene, and the used tar is the light tar obtained by the upper

Method used

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  • Gas naphthalene washing process in primary-cooling working procedure of coke oven gas purification unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: To fit 220 x 10 4 Ton coke / year coke oven battery, gas treatment capacity 13×10 4 m 3 / h meter, the normal gas flow is about 12×10 4 m 3 / h,

[0024] 1. Separation of raw gas:

[0025] The raw gas A from the coke oven is divided into crude coke oven gas B and tar ammonia water mixture R through the upward climbing of the pipeline, and the tar ammonia water mixture R flows to the tar ammonia water separation tank 10 by itself.

[0026] 2. Preparation of the upper condensate:

[0027] The crude coke oven gas B enters the gas cooler 4. The crude coke oven gas B contains 81t / h of water; 5.48t / h of tar; 1.02t / h of naphthalene. The section 43 and the cooling water section 44 of the second stage of the process, and the liquid separator 41 are arranged between the cooling water section 43 of the first stage of the process and the cooling water section 44 of the second stage of the process. The temperature of the hot water outlet C of the hot water section 42 i...

Embodiment 2

[0035] In order to prevent that the tar content of the circulating naphthalene washing liquid is too low or the naphthalene content is too high, affecting the naphthalene washing effect, the emulsion Q of 10 in the tar ammonia water separation tank can also be filled into the lower section of the circulating naphthalene washing liquid tank 8 in a self-flowing mode.

Embodiment 3

[0037] In order to further reduce the naphthalene content in the purified gas at 100-350mg / m 3 Within the range, a small amount of water-containing tar or tar washing oil is continuously added to the lower part of the circulating naphthalene washing liquid tank 8 to further reduce the naphthalene content of the tar in the circulating naphthalene washing liquid. The supplementary tar comes from the tar ammonia water separation tank, the mechanized tar ammonia water clarification tank or the hydrous tar separated from the mechanized tar clarification tank; the supplementary tar washing oil is a product of deep processing of tar. Depending on the requirements of different gas naphthalene content purification indicators, the naphthalene content of tar in the circulating naphthalene washing liquid is controlled within the range of 6-24wt% by controlling the supplementary amount of aqueous tar or tar washing oil.

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Abstract

The invention discloses a gas naphthalene washing process in a primary-cooling working procedure of a coke oven gas purification unit. In the naphthalene washing process, a separating system is arranged and comprises an upper condensate separating tank positioned near to a cooler, wherein the condensate on the upper stage of the cooler flows to the upper condensate separating tank in a form of gravity flow and stands in the tank for at least more than 30 min, and the separated tar flows to a lower circulating naphthalene washing liquid tank. Compared with the prior art, the invention has the advantages: firstly, the condensate continuously produced during the coke oven gas condensation process is used for washing naphthalene, the naphthalene content in the purified gas is 350-100 mg/m<3>,the dew-point temperature of naphthalene in the gas is lower than the gas temperature, a naphthalene removal device is not required to be arranged in the follow-up gas purification working procedure and the multi-step naphthalene washing process is changed into a one-step naphthalene washing process; secondly, the number of the process equipment is reduced to be minimum than that of the prior known naphthalene washing process, therefore, the land occupied by the equipment is also correspondingly reduced; and thirdly, the energy consumption of the working procedure is reduced.

Description

Technical field: [0001] The invention belongs to a coke oven gas purification unit of a coking plant, in particular to a naphthalene gas washing process in the initial cooling process of the coke oven gas purification unit. Background technique: [0002] During the purification process of coke oven gas, naphthalene in the gas will precipitate and block the gas purification equipment as the temperature decreases. At present, the industry focuses on removing naphthalene in the gas to the dew point temperature in the initial cooling process of the coke oven gas purification unit. the following. The corresponding naphthalene washing processes mainly include: initial cooling and removal of naphthalene by indirect-direct cooling series (referred to as process 1), initial cooling and removal of naphthalene by indirect horizontal tube primary cooler (referred to as process 2), and intermediate cooling between initial cooling and final cooling. Oil-washed naphthalene (referred to as...

Claims

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Application Information

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IPC IPC(8): C10K1/10
Inventor 毕振清沈立嵩杨建华王兴祥汪强
Owner MAANSHAN IRON & STEEL CO LTD
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