Method for simultaneous trapping gases obespredmechivanie and emissions from the door of the coke-pitch furnaces

 

(57) Abstract:

The method can be used to capture gases obespredmechivanie and emissions from the door of the coke-pitch ovens and can be used in the coking industry. The method is carried out by sucking air obespredmechivanie when issuing pitch coke from doorways air through hatches in the closed riser while maintaining before issuing, during and after coke specific quantity of gas obespredmechivanie, sewer, equal to 2-2,5 nm3/s and the ratio of the volume of these gases and emissions captured from doors equal 1:(2,5-3,5). The method allows to increase the efficiency of the joint trapping gases obespredmechivanie and emissions from the door of the coke-pitch ovens at low capital and operating costs. 3 tab., 1 Il.

The invention relates to a method of trapping gases obespredmechivanie and emissions from the door of the coke-pitch furnaces.

Technology for the production of pitch coke provides long (compared with the production of metallurgical coke) period obespredmechivanie risers and podsolevogo space coke-pitch furnaces. This period may be 40-60 min, moreover, the struts and door openings to the atmosphere. If we consider that in this period thrown away the greatest number cancerogenic substances (in particular, benzo-a-pyrene), the relevance containment and cleaning up emissions obespredmechivanie and issuing furnaces coke-pitch becomes obvious.

There is a method of trapping gases obespredmechivanie and emissions from the door when issuing coke-pitch furnaces, comprising sucking air before and after the coke through the riser (top to bottom), the coke box and the exhaust gases obespredmechivanie air through the manholes in a sewer, they organized the burning after suction from the chamber sequentially in two stages, subsequent treatment and discharge of treated gases into the atmosphere, as well as capture emissions from the door when issuing pitch coke using mobile umbrellas, transfer them to a separate reservoir, subsequent treatment and discharge of treated gases to the atmosphere (Annotated research report on dog. 79.95/e-3028. The development of the method of evacuation and treatment of emissions when burning and the issuance of coke-pitch furnaces (Phase 1), the Fund Ukhina research 7864, Kharkov, 1995, S. 5-6).

The disadvantage of this method is the presence of two independent suction and cleaning gases obespredmechivanie and emissions from the door of the coke-pitch furnaces things the STI and the achieved effect to the invention is a method for simultaneous trapping gases obespredmechivanie and emissions from the door when issuing coke-pitch furnaces, including sucking air before and after the coke through the riser (top to bottom), the coke box and the exhaust gases obespredmechivanie air through the manholes in a sewer, they organized the burning after suction from the chamber sequentially in two stages, as well as capture emissions from the door when issuing pitch coke, mix with the gases of obespredmechivanie organized after incineration and final purification of the mixture (Annotated research report on dog. 79.95/e-3028. The development of the method of evacuation and treatment of emissions when burning and the issuance of coke-pitch furnaces (Phase 1), the Fund Ukhina research 7864, Kharkov, 1995, S. 6-7).

The disadvantages of this method are the availability of emission of the risers when removing the door (in the period issuance of pitch coke), inefficient work of the joint system of suction and cleaning gases obespredmechivanie and emissions from the door of the coke-pitch furnaces without maintaining the required ratio of the volumes of gases obespredmechivanie and emissions from doors, sucked into a common header.

The objective of the invention is to increase the efficiency of trapping gases obespredmechivanie and emissions from the door of the coke-pitch ovens at low capital and operating costs of the I and emissions from the door when issuing coke-pitch furnaces, including sucking air before and after the coke through the riser (top to bottom), the coke box and the exhaust gases obespredmechivanie air through the manholes in a sewer, they organized the burning after suction from the chamber sequentially in two stages, as well as capture emissions from the door when issuing pitch coke, mix with the gases of obespredmechivanie organized after incineration and final purification of the mixture, when issuing pitch coke sucking the air obespredmechivanie carried out from doorways air through hatches in the closed riser, while before it is issued, during and after coke specific quantity of gas obespredmechivanie, sewer, support equal to 2-2,5 nm3/s ratio of the volume of these gases and emissions captured from doors equal 1 : (2,5 - 3,5).

The features of the process have the following causal relationship with achievable technical result:

the sucking of air obespredmechivanie when issuing pitch coke from doorways air through hatches in the closed riser maintains the required hydraulic regime in the chamber coking during the period issuance of pitch coke at obespredmechivanie and the volume ratio of gas obespredmechivanie and emissions from the door of the coke-pitch furnaces, served in a common header before it is issued, during and after the coke to maintain in podshvalova space furnace coke-pitch required hydraulic mode and enables efficient capture of emissions from doors and gas obespredmechivanie into a common header with minimal capital and operating costs.

The method was tested in industrial conditions in the coke-pitch furnaces Zaporozhye coke.

For clarity, the drawing shows a circuit implementing the method.

Needed to obespredmechivanie camera coking 1 air (before and after coke) by means of the vane 2 is sucked up through the riser 3 coke ovens. In the space podsvodovom coke ovens at the expense of oxygen and high temperature burnout occurs graphite. The resulting gases of obespredmechivanie containing combustible components, proceed through the air hatches 4 on the first stage combustion 5, where the combustion of combustible components to intrinsically safe concentrations.

During coke when removing doors 6 riser shut and the air in podlogowe space comes through doorways when this happens is ment to line 7 arrive at the second stage combustion 8, where they are thermally treated. After the second stage of combustion gases obespredmechivanie sent to the collector 9, where they are mixed with gases captured from the door of the coke-pitch 6 furnaces. Gases captured from the door of the coke-pitch furnaces using mobile 10 umbrellas come in a collector (9), where they mix with the gases of obespredmechivanie. The collector 9 a mixture of gases obespredmechivanie and gases captured from the door, enters the purification system 11 for their final disposal. After cleaning gases through the fan 2 and the tube 12 are released into the atmosphere.

Example 1. Experiments were carried out to justify the legality of the selection range changes specific quantity of gas obespredmechivanie, sewer. The ratio of the volume of gas obespredmechivanie and emissions from the doors was maintained equal to 1 : 2,5.

The data obtained are given in table. 1

As shown, the decreasing amount of gases of obespredmechivanie, sucked from the chamber coking, less than 2 nm3/dramatically reduces the degree of trapping of emissions due to the decrease of vacuum in the chamber coking to values that do not allow to eliminate the emission gas is lecturer, more than 2.5 nm3/s leads to an increase of vacuum in the chamber coking up above the permissible values, which are razgrupisavanje seams of the walls of the chamber coking, resulting in leaking of the masonry walls. This leads to the system of raw coke oven gas in the heating walls and, consequently, to the increase of emissions from the chimney.

Optimal specific quantity of gas obespredmechivanie, sucked into the manifold is 2 - 2.5 nm3/s

Example 2. Experiments were carried out to justify the legality of the selection range changes the volume ratio of gas obespredmechivanie and emissions from doors, directed into a common header.

Specific quantity of gas obespredmechivanie supplied to the common manifold was maintained equal to 2.5 nm3/s

The data obtained are given in table. 2.

Analysis of the data given in table. 2 shows that the optimal ratio of the volume of gas obespredmechivanie and emissions from doors is 1 : (2,5 - 3,5).

The reduction of the share of emissions from doors, directed into a common header, reduces the degree of their capture, and excessive increase entails increased the other type of fan with higher performance and a more powerful engine.

Comparative analysis of the known (similar to the prototype) and the proposed method are given in table. 3.

Comparison of proposed method with known proves that it provides the most complete joint capture emissions at low capital and operating costs.

Method for simultaneous trapping gases obespredmechivanie and emissions from the door when issuing pitch coke from the coke-pitch furnaces, comprising sucking air obespredmechivanie before and after the issuance of pitch coke through the riser from the top down and the coke box, the suction generated gases obespredmechivanie air through the manholes in a sewer, they organized the burning after suction from the chamber sequentially in two stages, as well as capture emissions from the door when issuing pitch coke, mix with the gas obespredmechivanie organized after incineration and final purification of the mixture, characterized in that when issuing pitch coke sucking the air obespredmechivanie carried out from doorways air through hatches in the closed riser, while before it is issued, during and after coke specific quantity of gas obespredmechivanie directed by the door, equal to 1 : (2,5 - 3,5).

 

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