Features: Currently, By-product Recovery Type Coke Oven with stamp-charging is the most popular type for coking. It has the following advantages: compact structure, recover chemical products like tar and crude benzene, coke oven gas, and high efficiency, etc. This technology adopts the stamping technique to widen the source-base of coking coal, improve coke quality, and reduce the costs of raw material and production, etc.

Features:
Currently, By-product Recovery Type Coke Oven with stamp-charging is the most popular type for coking. It has the following advantages: compact structure, recover chemical products like tar and crude benzene, coke oven gas, and high efficiency, etc. This technology adopts the stamping technique to widen the source-base of coking coal, improve coke quality, and reduce the costs of raw material and production, etc.

Our Achievement

In the field of BY-PRODUCT RECOVERY-TYPE COKE OVEN, SSIT has gained outstanding achievements. Coke Oven technology developed by us is mainly of Stamping Charging Coke Oven with carbonization chamber heights of 4.3m, also, top charging Coke Oven with carbonization chamber of similar heights. Till now, we have served over 100 customers by providing design, equipment, material supply and construction. Our Reference List of Stamp-Charging Type Coke Oven Projects commissioned in the recent past are as follows:

Project Reference List
 

Process Description
Coking process is the most important aspect to optimize the use of coal. Coal is carbonized that becomes coke under high temperature with the generation of coke oven gas and various chemical products. A coking plant chiefly comprises of coal preparation, coking, coke quenching and screening, gas purification, etc.

1. Coal Preparation

Coal preparation is the preparatory stage of coking. Here, coal is received, then blended, crushed and mixed. Coal, stored in the coal yard, is segregated as per different classifications and delivered to the different coal blending hoppers by belt conveyors. Several categories of coal are proportioned in the blending hoppers, then, crushed and mixed in the crushing house and conveyed to the coal tower.

Coking is the process where blended coal is carbonized under high temperature in carbonization chambers to produce coke and crude gas. The process consists of coal stamping, charging, coking, and coke discharging. After stamping, the coke cake is charged into the carbonization chamber by a charging car to soften, melt, solidify, shrink, and eventually form coke. The final coke is pushed out of the carbonization chambers by a pushing and charging car and transferred to the next stage of treatment. Abundant crude gas, produced during the carbonization process, is cooled down to around 84¡æ at a high line by spraying ammonia water. It is then, via a header, delivered to the gas purification shop for treatment.

The main equipment in this section consist of a coke oven battery, stamping station, charging and pushing car, coke guiding car, and quenching car.

2. Coke Quenching & Screening

Temperature in the carbonization chamber is around 1000¡æ. Currently, Wet quenching method is the most popular method in use. Hot coke is delivered to the quenching tower where cooling water quenches and cools down the coke to the lower temperature. It is then discharged onto a wharf, retained for 30 minutes and then conveyed to the screening tower. Coke is screened according to the requirement of the individual end-users.

3. Gas condensation and Exhauster

The temperature of crude gas in the header is around 84¡æ. It is mixed with abundant tar and gas. To facilitate the utility and delivery, crude gas needs to be cooled down to 22¡æ. Tar and ammonia water are condensed and drawn out. In order to induce crude gas from the coke oven smoothly and also maintain the gas pressure, which is required by the sequential process of coal gas purification, cooled gas is drawn by an exhauster. Tar removed coal gas is brought to the desulphurization section for desulphurization treatment.

• Equipment in this section mainly comprises of a primary cooler, an electronic tar precipitator, and an exhauster.
• Main product: Tar

4. Desulphurization

Sulfur in the purified gas is de-sulfured below 200mg/m³ in this process to meet the requirements of gas users and recover resultant chemical products. At present, we adopt the Wet-type Oxidation Desulphurization process, which is widely accepted. Its salient features are: Environment friendly, Compact, Easy operation, Highly efficient desulphurization, etc. In addition, sulfur produced in the this section of desulphurization can used to produce sulfuric acid.

• The main equipment of the desulphurization section are a Desulphurization tower, Regenerating tower, Ammonia vaporizing tower.
• Main product: Sulfur.

5. Ammonium Sulfate Section

The Ammonia content in the gas is purified below 50mg/m³ to meet the requirement of gas users and facilitate transportation. Presently, there are two widely adopted technologies: (a) ammonium sulfate process and (b) ammonia decomposition process. However, the former one is more popular as it can produce ammonium sulfate products at low cost, thereby more economical and practical.

The principle of ammonium sulfate process is to use sulfuric acid to absorb ammonia in the gas, and then produce ammonium sulfate products.

• The major equipment of this section is a Saturator.
• Main product: Ammonium Sulfate.

6. Benzol Scrubbing

Benzol is an important chemical material, which has high economic value. Benzol Scrubbing means the use of washing oil (tar or petroleum) to absorb benzol in the gas. After passing through the scrubbing tower, benzol is separated to produce semi-finished benzol products, which can be further refined or sold. Washing oil is recyclable after benzol scrubbing.

• The major equipment are a Benzol Scrubbing Tower and a Benzol Removing Tower.
• Main products: semi-finished benzol products, pure gas.

Crude gas from coke oven can be purified into high caloric coke oven gas after purification process and chemical products recovered. It can be used for both industrial and domestic purposes; and can also be used by chemical plants as a raw material for chemical synthesis.

BEIJING SINO-STEEL INDUSTRY & TRADE GROUP CORP.

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