A method for dry quenching coke heating and boosting

Abstract

The application discloses a dry quenching temperature and pressure increasing method, and belongs to the technical field of dry quenching of coking. The method increases the temperature in the dry quenching furnace, mainly restores the normal temperature of the dry quenching furnace body and internal working conditions, and increases the pressure, mainly gradually increases the boiler drum pressure, so as to restore the normal pressure of the whole dry quenching circulating system. The core purpose of temperature and pressure increasing is to increase the temperature of the dry quenching furnace and the temperature and pressure of the circulating system according to the planned scheme, avoid the heat shock damage or damage of the dry quenching refractory material and equipment caused by unplanned temperature and pressure increasing operation of the system, guarantee the safety of the furnace body refractory material and the circulating equipment, and create conditions for the system to restore normal production.

Description

Technical Field

[0001] This invention belongs to the field of dry quenching technology in coking, and particularly relates to a method for raising the temperature and pressure during dry quenching. Background Technology

[0002] The principle of dry quenching coke is to use inert gas to exchange heat with red-hot coke in the dry quenching furnace to cool the coke. After absorbing the sensible heat of the red-hot coke, the inert gas transfers the heat to the waste heat boiler to generate steam, which is then sent to the turbine to generate electricity. The cooled inert gas is then purged of dust and blown back into the dry quenching furnace by a circulating fan for reuse.

[0003] The dry quenching system mainly consists of a coke conveying and cooling system, an inert gas circulation system, a steam-water system, and a dust removal system.

[0004] Due to the unique nature of dry quenching units, after planned maintenance of core equipment such as leaking water-cooled jackets, circulating fans, and leaking ash in pipelines, or after handling sudden faults such as interrupted inert gas circulation, boiler tube rupture, or abnormal material levels in the dry quenching furnace, it is essential to gradually increase the furnace temperature and system pressure through a temperature and pressure increase operation method. This provides a safe and stable operating environment for the dry quenching system to resume normal production, avoiding safety accidents such as thermal shock and refractory material cracking caused by sudden temperature and pressure increases. Furthermore, improper temperature and pressure increase operations during system restart can easily lead to thermal shock damage to the furnace refractory materials, stress concentration on the boiler heating surfaces, and imbalances in circulation system parameters, resulting in secondary equipment damage and hindered production recovery. Therefore, through repeated demonstrations in production practice, a method for temperature and pressure increase in dry quenching units suitable for the above situations has been developed to ensure the safe and smooth resumption of production after maintenance, prevent safety accidents, and shorten the restart cycle. Summary of the Invention

[0005] The purpose of this invention is to provide a method for raising the temperature and pressure of a dry quenching system during special circumstances such as planned shutdown for maintenance or emergency shutdown for maintenance due to sudden failures, in order to resume production. Through multiple demonstrations of the scheme, the expected results have been achieved, laying the foundation for the rapid restoration of continuous dry quenching production.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The present invention discloses a method for raising the temperature and pressure during dry quenching, comprising the following steps:

[0008] 1) Open the commonly used vent valve to 45-55%, and open one cover on each of the inclined channel bolts;

[0009] 2) Report to the dispatch room and request the supply of medium-pressure steam to the deaerator;

[0010] 3) Start the deaerator feedwater pump and boiler feedwater pump to supply water to the boiler and maintain the normal liquid level in the steam drum;

[0011] 4) Open the continuous blowdown valve, steam and boiler water sampling valve;

[0012] 5) Open the steam trap on the steam pipe;

[0013] 6) Start the forced circulation pump;

[0014] 7) Start the circulating fan and adjust the pressure through the steam vent valve;

[0015] 8) Start loading coke and prepare for heating; the initial coke loading rate is 1 furnace / h, after loading 5 furnaces continuously, adjust to 1 furnace / 38-42min, and after loading 5 more furnaces continuously, adjust to 1 furnace / 28-32min.

[0016] 9) Start the coke discharge device, and initially control the heating rate at 20-30℃ / h; after the boiler inlet temperature reaches 600℃, increase the temperature at 48-52℃ / h.

[0017] 10) Adjust the pre-stored pressure to ±0Pa and switch to automatic mode. Adjust the opening of the commonly used relief valve to 18-22%.

[0018] 11) Adjust the steam vent valve to control the steam drum pressure rise rate to ≤0.5MPa / h; when the boiler inlet temperature reaches 800℃, the steam drum pressure should be maintained at 2.8-3.2MPa;

[0019] 12) Control the boiler water level at ±0mm, manually or automatically;

[0020] 13) Control the outlet temperature of the secondary superheater; initially control manually, then switch to automatic control after stabilization;

[0021] 14) When the main steam temperature reaches 420℃, close the drain valves of the primary superheater and the secondary superheater;

[0022] 15) The primary and secondary dust collectors are put into operation for automatic ash removal.

[0023] Furthermore, open the commonly used vent valve to 50%.

[0024] Furthermore, after starting the circulating fan, adjust the air volume according to the temperature.

[0025] Furthermore, after continuously loading 5 furnaces, the rate was adjusted to 1 furnace / 40 minutes.

[0026] Furthermore, after continuously loading 5 furnaces, the rate was adjusted to 1 furnace / 30 minutes.

[0027] Furthermore, after starting the coke discharge device in step 9), the discharge volume gradually increases according to the temperature.

[0028] Furthermore, after the boiler inlet temperature reaches 600℃, the temperature is increased at a rate of 50℃ / h.

[0029] Furthermore, the steam drum pressure is maintained at 3.0 MPa.

[0030] Furthermore, in step 10), the opening of the common vent valve is adjusted to 20%.

[0031] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0032] The core of this invention is to create conditions for system resumption of production that are both "safe" and "efficient." It protects the furnace refractory materials and circulation equipment by precisely controlling the heating and pressurization rates, preventing refractory material cracking and detachment, as well as damage to boilers, fans, and other equipment due to abnormal heating and pressurization. Furthermore, it shortens the heating and pressurization cycle through coordinated regulation of nitrogen and the boiler, while simultaneously monitoring gas composition and equipment operating parameters throughout the process to eliminate risks such as combustion explosions and equipment overload, thus laying a safe and efficient foundation for subsequent normal production. This method of heating and pressurizing after dry quenching coke maintenance has significant promotional and application value, laying the foundation for quickly restoring continuous dry quenching coke production and reducing downtime losses, bringing considerable economic benefits to the development of dry quenching coke. Detailed Implementation

[0033] A method for raising the temperature and pressure of a dry quenching coke system is disclosed in this patented invention. This method primarily achieves the purpose of raising the temperature and pressure of the dry quenching furnace and increasing the boiler drum pressure. It is mainly applicable to raising the temperature and pressure after routine planned maintenance and troubleshooting, requiring no entry into the furnace; simply raising the temperature and pressure to the normal operating conditions for production is sufficient. The specific steps include:

[0034] 1. Open the commonly used vent valve to 50%, and open one cover on each of the inclined channels.

[0035] 2. Report to the dispatch room and request the supply of medium-pressure steam to the deaerator.

[0036] 3. Start the deaerator feed water pump and boiler feed water pump to supply water to the boiler and maintain the normal liquid level in the steam drum.

[0037] 4. Open the continuous drain valve, steam and boiler water sampling valve.

[0038] 5. Open the steam trap on the steam pipe.

[0039] 6. Start the forced circulation pump.

[0040] 7. Start the circulating fan (adjust the air volume according to the temperature) and adjust the pressure through the steam vent valve.

[0041] 8. Begin loading coke and preparing for heating. The initial coke loading rate is 1 furnace / h. After loading 5 furnaces consecutively, adjust to 1 furnace / 40min. After loading another 5 furnaces consecutively, adjust to 1 furnace / 30min.

[0042] 9. Start the coke discharge device (the discharge rate is gradually increased according to the temperature). The initial heating rate is controlled at 20-30℃ / h. After the boiler inlet temperature reaches 600℃, the heating rate is increased at 50℃ / h.

[0043] 10. Adjust the pre-stored pressure to ±0Pa (switch to automatic), and adjust the opening of the common relief valve to 20%.

[0044] 11. Adjust the steam vent valve to control the steam drum pressure rise rate to ≤0.5MPa / h. When the boiler inlet temperature reaches 800℃, maintain the steam drum pressure at 3.0MPa.

[0045] 12. Control the boiler water level at ±0mm (manual or automatic).

[0046] 13. Control the outlet temperature of the secondary superheater (initially manually controlled, then switched to automatic control after stabilization).

[0047] 14. When the main steam temperature reaches 420℃, close the drain valves of the primary superheater and the secondary superheater.

[0048] 15. The primary and secondary dust collectors are put into operation for automatic ash removal.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for dry quenching of coke with heating and pressure increase, characterized by, Includes the following steps: 1) Open the commonly used vent valve to 45-55%, and open one cover on each of the inclined channel bolts; 2) Report to the dispatch room and request the supply of medium-pressure steam to the deaerator; 3) Start the deaerator feedwater pump and boiler feedwater pump to supply water to the boiler and maintain the normal liquid level in the steam drum; 4) Open the continuous blowdown valve, steam and boiler water sampling valve; 5) Open the steam trap on the steam pipe; 6) Start the forced circulation pump; 7) Start the circulating fan and adjust the pressure through the steam vent valve; 8) Start loading coke and prepare for heating; the initial coke loading rate is 1 furnace / h, after loading 5 furnaces continuously, adjust to 1 furnace / 38-42min, and after loading 5 more furnaces continuously, adjust to 1 furnace / 28-32min. 9) Start the coke discharge device, and initially control the heating rate at 20-30℃ / h; after the boiler inlet temperature reaches 600℃, increase the temperature at 48-52℃ / h. 10) Adjust the pre-stored pressure to ±0Pa and switch to automatic mode. Adjust the opening of the commonly used relief valve to 18-22%. 11) Adjust the steam vent valve to control the steam drum pressure rise rate to ≤0.5MPa / h; when the boiler inlet temperature reaches 800℃, the steam drum pressure should be maintained at 2.8-3.2MPa; 12) Control the boiler water level at ±0mm, manually or automatically; 13) Control the outlet temperature of the secondary superheater; initially control manually, then switch to automatic control after stabilization; 14) When the main steam temperature reaches 420℃, close the drain valves of the primary superheater and the secondary superheater; 15) The primary and secondary dust collectors are put into operation for automatic ash removal.

2. The method for increasing temperature and pressure in dry quenching coke according to claim 1, characterized in that, Open the commonly used vent valve to 50%.

3. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, After starting the circulating fan, adjust the air volume according to the temperature.

4. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, After loading 5 furnaces consecutively, adjust the rate to 1 furnace / 40 minutes.

5. The method for raising temperature and pressure in dry quenching coke according to claim 1 or 4, characterized in that, After loading 5 more furnaces, adjust the rate to 1 furnace / 30 minutes.

6. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, After starting the coke discharge device in step 9), the discharge volume gradually increases according to the temperature.

7. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, After the boiler inlet temperature reaches 600℃, the temperature is increased at a rate of 50℃ / h.

8. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, The steam drum pressure is maintained at 3.0 MPa.

9. The method for raising temperature and pressure in dry quenching coke according to claim 1, characterized in that, In step 10), the opening of the common vent valve is adjusted to 20%.