UA113659U - INSTALLATION OF COOK DRY DRYING - Google Patents

Abstract

The dry coke extinguishing unit comprises independent units including a coke extinguisher, a heat recovery boiler and a closed cooling gas circulation system, a means for removing excess cooling gas volume from the circulation system, and a system for purification and disposal of excess gas. The means for removing excess volume of cooling gas from the circulation system includes a common manifold connected to the cold spark plug of each unit of dry coke extinguishing through a shut-off valve and an adjusting valve to maintain the set pressure in the circulation system of each unit. At the same time a waste candle is mounted on the common collector. The installation contains a system of purification and utilization of excess gas, which is connected to the common manifold through an explosion-proof chamber and a shut-off valve with an actuator, and contains a gas cooler with internally water-cooled heating surfaces, a bag filter, a mixing chamber. The explosion-proof chamber is equipped with an ignition torch and an explosion-proof valve, and the inlet and outlet of the explosion-proof chamber have direct-acting non-return valves that close the inlet and outlet during the excess gas explosion.

Description

heating surfaces, a bag filter, a mixing chamber, which is connected to the bag filter, and is also connected through the gas flow regulator to the coke gas pipeline and through the supercharger and shut-off valve to the blast furnace gas pipeline to the coke battery, while the gas flow regulator is designed to regulate the consumption of coke gas depending on the readings of the gas analyzer to ensure the specified calorific value of blast furnace gas in the obtained gas mixture, and the explosion detection chamber is equipped with an ignition burner and an anti-explosion valve, and direct action check valves are installed at the entrance and exit of the explosion detection chamber, which close inlet and outlet during the explosion of excess gas, ensures that in dry coke quenching installations with several independent units, the use of one gas treatment after the common manifold, and not at each discharge plug of each independent unit. In addition, the efficiency of using excess gas increases, which, after increasing its calorific value to the calorific value of blast furnace gas, is used together with it for heating coke batteries. And in emergency cases, the explosion of excess gas is localized in the explosion localization chamber, which prevents the destruction of the equipment of the dry coke quenching and gas purification of excess gas.

The essence of the useful model is explained by the drawing, which schematically depicts the general appearance of the dry coke quenching installation.

The drawing uses the following designations: 1 - independent block; 2 - excess gas pipeline;

C - a cold candle; 4 - common collector; - shut-off valve; b - control valve; 7 - reset candle; 8 - shut-off valve; 9 - explosion detection camera; - shut-off valve; 11 - ignition burner; 12 - anti-explosion valve; 13 - direct action check valve; 14 - direct action check valve; - gas cooler; 16 - sleeve filter; 17 - mixing chamber; 18 - control valve; 19 - shut-off valve; - coke gas pipeline; 21 - supercharger; 22 - shut-off valve; 23 - blast furnace gas pipeline; 24 - additional candle; - regulating valve; 26 - pump group; 27 - water-air gas cooler; 28 - leveling tank.

In a specific embodiment, the proposed dry coke quenching installation contains independent units 1, including a coke quenching chamber, a recovery boiler and a closed cooling gas circulation system (not shown in the drawing). In each independent unit 1, the means for removing the excess volume of cooling gas with a temperature of up to 180 "C from the circulation system in front of the extinguishing chamber contains the excess gas pipeline 2, on which a cold candle 3 is installed. In addition, the means for removing the excess volume of cooling of gas from the circulation system includes a common collector 4 connected to a cold candle from each unit of the dry coke quenching installation through an electric shut-off valve 5 and an electric control valve b to maintain the set pressure in the circulation system of each unit. At the same time, a relief valve is installed on the common collector 4 candle 7 with an electric shut-off valve 8. The installation includes a system for cleaning and disposal of excess gas, which is connected to a common collector 4 through an explosion-localizing chamber 9 and an electric-driven shut-off valve 10. At the same time, the explosion-localizing chamber 9 is equipped with an ignition burner 11 and an explosion-proof valve 12. entrances and exits of the explosion detection k amer 9 direct-acting non-return valves 13 and 14 are installed, which close the explosion localization chamber 9 during an explosion of excess gas. The system of purification and disposal of excess gas includes a gas cooler 15 connected to the outlet of the explosion detection chamber 9 with water-cooled tubular heating surfaces installed inside, a bag filter

16, the mixing chamber 17, which is connected to the bag filter 16, and is also connected through the regulating valve 18 and the shut-off valve 19 to the coke gas pipeline 20 and through the supercharger 21 and the shut-off valve 22 to the blast furnace gas pipeline 23 to the coke battery. The control valve 18 is designed to regulate the flow of coke gas depending on the readings of the gas analyzer (not shown in the drawing) to ensure the given calorific value of blast furnace gas in the resulting gas mixture. An additional spark plug 24 is installed between the supercharger 21 and the shut-off valve 22.

The gas cooler 15 through the control valve 25 and the pump group 26 is connected to the water-air gas cooler 27, which is connected to the equalization tank 28.

In a specific example of implementation, the proposed dry coke quenching installation, consisting of six independent blocks, of which 4 or 5 blocks are constantly in operation, works in the following way.

The excess gas enters from each working unit 1 into the common collector 4 through the excess gas gas line 2, connected to the cold candle C of each working unit through the open shut-off valve 5 and the electric control valve 6, designed to maintain the set pressure in the circulation system of each unit. At the same time, the shut-off valves of 5 blocks, which are in reserve or under repair, are closed, and the control valves are disconnected from the automation system. On the common collector 4, the shut-off valve 8 on the reset candle 7 is closed.

The excess gas from the common collector 4 through the open shut-off valve 10 enters the explosion detection chamber 9. The non-return valves 13 and 14 at the entrance and exit of the explosion detection chamber 9 are normally open, the explosion-proof valve 12 is normally closed. The normal position of the anti-explosion valve flap 12 is provided by a counterweight or a spring. The ignition burner 11 burns in the explosion localization chamber 9 constantly. As an ignition burner, a two-wire or coke gas injection burner with an electric igniter of known designs can be installed. In the absence of emergency situations, the excess gas does not contain oxygen and bypasses the explosion localization chamber 9 and non-return valves 13 and 14. Before gas cleaning, the gas is cooled in the gas cooler 15 to a temperature acceptable for further supply to the blast furnace gas network.

The gas cooler 15 is equipped with water-cooled heating surfaces of tubular or plate construction, for example tubular. The gas cooler 15 has an additional function of a spark arrester in case of the presence of hot particles of coke or ash in the excess gas after explosions in the explosion localization chamber 9. With the help of the pump group 26, water circulates in a closed circuit through the gas cooler 15 and through the water-air gas cooler 27 with the fan on. The water consumption is regulated by the control valve 25, which ensures a stable temperature of the cooling gas. Temperature fluctuations of the water volume are compensated in the equalization tank 28. If the enterprise has a closed circulating cycle of technical water with the necessary parameters, it becomes possible to cool the gas cooler 15 with this water through the control valve 25 with the possibility of not using the water-air heat exchanger 27, the equalization tank 28 and the pump group 26.

The cooled excess gas is cleaned of dust in the bag filter 16 with pulse regeneration. Regeneration is carried out with compressed nitrogen. The excess gas, cleaned of dust to its final content, based on the standards for blast furnace gas, enters the mixing chamber 17, into which coke gas enters from the coke gas pipeline 20 through the open shut-off valve 19. The consumption of coke gas is regulated by the control valve 18 according to the pulse from the gas analyzer to ensure the calorific value of the mixture of excess and coke gas in accordance with the calorific value of blast furnace gas, which is used for heating coke batteries.

The mixture of excess and coke gas is pumped by the supercharger 21 through the open shut-off valve 22 into the furnace gas pipeline 23. At the same time, the shut-off valve on the candle 24 is closed.

In an emergency situation, when an explosive mixture of excess gas and air enters the common collector 4, the dry coke extinguishing installation works as follows. In this case, the gas mixture, entering the explosion localization chamber 9, is ignited by the incendiary burner 11, which is constantly burning, and explodes. The increased pressure that develops during the explosion closes the normally open direct-acting non-return valves 13 and 14 and opens the anti-explosion valve 12. After the gas exits through the anti-explosion valve 12, the pressure in the explosion localization chamber 9 drops and the anti-explosion valve 12 closes, and the direct-acting non-return valves 13 and 14 open. The hot gas coming out of the explosion detection chamber 9 after the explosion is cooled in front of the bag filter 16 in the gas cooler 15. In the event of a second explosion in the explosion detection chamber 9, the process of disposal of excess gas is stopped. For this, shut-off valve 8 on the discharge plug 7 is automatically opened at the same time, shut-off valves 10 and 22 are closed, supercharger 21 and pump group 26 are turned off, and the fan of the water-air heat exchanger 27 is turned off. In this case, the excess gas is directed into the atmosphere through the discharge plug 7.

In the event of stopping the excess gas disposal system for repairs, the excess gas of blocks 1 is switched to cold candles 3. Shut-off valves 5 and 22 are closed. The ignition burner 11 goes out. The stop valve 8 on the reset candle 7 and the stop valve on the additional candle 24 are opened. The shut-off valve 22 in front of the blast furnace gas pipeline 23 is closed. The supercharger 21 works until the excess gas is completely displaced by the air into the atmosphere through the additional candle 24.

After that, the supercharger 21, the pump group 26 and the fan of the water-air heat exchanger 27 are turned off.

Restoration of utilization of excess gas from the dry coke quenching plant is carried out as follows. Stop valves 10 and 22 are closed. The pump group 26 and the fan of the water-air heat exchanger 27 are started. The shut-off valves 5 on the working units 1 and the shut-off valve 8 on the discharge candle 7 are opened. The common manifold 4 is blown to fill with excess gas, after which the shut-off valve 8 is closed, the shut-off valve 10 and the shut-off valve are simultaneously opened the valve on the additional candle 24. The shut-off valve 19 on the coke gas pipeline 20 and the shut-off valve 22 in front of the blast furnace gas pipeline 23 are closed. Ignition burner 11 does not burn. The supercharger 21 is turned on until the air is completely displaced by excess gas, after which the shut-off valve 19 on the coke gas pipeline 20 opens. Automation is turned on. After the mixture of excess and coke gas reaches the required calorific value in the absence of oxygen, the ignition burner 11 is turned on, the shut-off valve 22 is opened in front of the blast furnace gas pipeline 23, the shut-off valve on the additional candle 24 is closed. The mixture of excess and blast furnace gas is pumped into the blast furnace gas pipeline 23.

The proposed system makes it possible to fully use the thermal potential of excess gas as fuel, to avoid the emission into the atmosphere of dust contained in excess gas in the amount of up to 1000 mg/nm3 and CO, the content of which reaches 12 95 and more. The system is reliable in operation, guarantees the absence of destruction during the explosion of a mixture of excess gas and air in emergency cases. ts 1 1 M i i k u i x AH E x x I x as 4 4 E 4. x y Ko Z i sh i I she i g i g 7 "shcha iyi 1 more A shchi i che sh- S Zh d 'ye dya de j to dk m - y pa y E /

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