What is the process flow of the coking plant?

Coking plants generally consist of coal preparation workshop, coking workshop, recycling workshop, tar processing workshop, benzene processing workshop, desulfurization workshop and wastewater treatment workshop.

The general process is as follows: Extended information

Introduction

The coking chemical industry is an important part of the coal chemical industry. The main coal processing methods include high-temperature coking (950 ---1050 degrees Celsius), medium temperature coking and low temperature coking. The metallurgical industry generally uses high-temperature coking to obtain coke and recover chemical products.

The product coke can be used as fuel for blast furnace smelting, casting, non-ferrous metal smelting, and water gas production; it can be used to make furnace gas for the production of synthetic ammonia, and it can also be used to make calcium carbide to obtain raw materials for the organic synthesis industry. raw material.

The chemical products produced during the coking process are recovered and processed to extract tar, ammonia, naphthalene, hydrogen sulfide, crude benzene and other products, and obtain net coke oven gas, coal tar, crude benzene refining processing and depth After processing, benzene, toluene, xylene, carbon disulfide, etc. can be produced. These products are widely used in the chemical industry, pharmaceutical industry, refractory industry and national defense industry.

Clean coke oven gas can be used for domestic and industrial fuel. The ammonia in coal gas can be used to make ammonium sulfate, concentrated ammonia, anhydrous ammonia, etc. The coking chemical industry has hundreds of products. China's coking chemical industry has been able to produce more than 100 chemical products from coke oven gas, tar and crude benzene, which is of great significance to the development of China's national economy.

China is a major country in the production, consumption and export of coking products. Coking products are widely used in the chemical industry, pharmaceutical industry, refractory industry and national defense industry. The coking industry has developed rapidly in recent years. Shanxi Province is China's largest coke-producing province. In 2006, it produced 92 million tons of coke, accounting for about one-third of the country's total. Its export supply of coke resources accounts for about 80% of the country's total. For many years, Shanxi's coke has been in the international trade market. The proportions above are all over 50.

Coking development

It is precisely because of the above advantages of delayed coking that delayed coking has developed rapidly in China. This is mainly because:

(1 ) Delayed coking is an effective means to solve the contradiction between supply and demand of diesel-gasoline ratio. This is because Chinese crude oil is generally heavy, has high wax content, and has a low diesel yield. The diesel fraction yield of domestic crude oil is on average 5 to 7 percentage points lower than that of foreign crude oil. Therefore, China currently imports approximately 80×10t of diesel each year and has to export 30×10t of gasoline in order to balance domestic supply and demand.

Secondly, because the secondary processing of Chinese oil refineries is mainly catalytic cracking, the diesel-gasoline ratio is low (delayed coking is 1.94, catalytic cracking is 0.56), so the development of delayed coking is to solve the contradiction between supply and demand of diesel-gasoline ratio , an effective way to increase diesel production.

(2) Compared with hydrocracking, delayed coking has the disadvantage of poor stability of light oil products, but its operating cost is lower (the processing fee is about 1% of the operating cost of hydrocracking). 1/2～1/3) making it highly competitive.

Because delayed coking has the advantages of low investment, low operating costs, and high conversion depth, delayed coking has developed into one of the most important processing methods for lightweighting residual oil. Therefore, in the current situation where China's funds are tight and the contradiction between supply and demand of light oil products, especially diesel and gasoline, is outstanding, delayed coking is one of the more ideal means to solve this contradiction.

Reference material: Coking--Baidu Encyclopedia