Dry quenching boiler and main steam diffusing system thereof

Abstract

The embodiment of the utility model provides a dry quenching boiler and main steam bleeding system thereof, the main steam bleeding system of dry quenching boiler comprises: main steam pipeline and pressure regulating bleeding pipeline, the pressure regulating bleeding pipeline is provided with a first switch valve and a regulating valve that are connected in series or in parallel, the dry quenching boiler under the rated load, the first switch valve and the regulating valve are connected in series or in parallel. The evaporation capacity generated per hour is Q1, the maximum steam exhaust capacity per hour under the maximum opening degree of the regulating valve is Q2, and the ratio of Q2 to Q1 is larger than or equal to 0.8 and smaller than or equal to 1; the regulating valve is a pneumatic valve, and the consumed time for opening the regulating valve from 0% to 100% is t1; the time consumed by the first switch valve from closing to opening of the pressure regulating and diffusing pipeline is t2; t1 is less than t2. In the embodiment of the scheme, the maximum steam exhaust amount Q2 of the regulating valve is matched with the evaporation amount Q2 generated by the dry quenching boiler under the rated load, the steam exhaust flow of the pressure regulating and diffusing pipeline is regulated through the opening degree of the regulating valve, steam generated by the dry quenching boiler can be more quickly and accurately discharged, and the running safety of the dry quenching boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coke dry quenching treatment equipment, in particular to a coke dry quenching boiler and its main steam relief system. Background Art

[0002] The general process of the coke dry quenching treatment process is as follows: the coke dry quenching furnace uses inert gas to exchange heat with and cool down the red-hot coke. After the inert gas exchanges heat and rises in temperature, it is transported to the coke dry quenching boiler to generate steam, and the steam is then transported to the steam turbine unit for power generation.

[0003] Among them, the steam output by the coke dry quenching boiler is transported to the steam turbine unit through the main steam pipeline. When the steam turbine unit is not in power generation, in order to prevent the pressure of the main steam pipeline from being too high, a pressure regulating and relief pipeline is connected to the main steam pipeline. An electric stop valve and a regulating valve are arranged side by side on the pressure regulating and relief pipeline. The nominal diameter of the regulating valve is determined according to 15% of the rated load of the coke quenching boiler, so that its maximum flow rate is approximately the same as 15% of the rated load of the coke quenching boiler.

[0004] When the pressure of the main steam pipeline is relatively high, the regulating valve can be opened to discharge the air flow in the main steam pipeline through the pressure regulating and relief pipeline to achieve pressure reduction.

[0005] When the pressure of the main steam pipeline is even higher and the regulating valve is fully opened and still cannot meet the pressure reduction requirement, it is necessary to cooperate with the opening of the above-mentioned electric stop valve to discharge the air flow in the main steam pipeline through the pressure regulating and relief pipeline to achieve continuous pressure reduction. In actual operation, on the one hand, the electric stop valve is in a point-moving mode, resulting in poor adjustment accuracy of steam discharge. On the other hand, the opening action of the electric stop valve is relatively slow, resulting in difficulty for the electric stop valve and the regulating valve to quickly reduce the rapidly increasing pressure of the main steam pipeline, which is not conducive to the safe operation of the coke dry quenching boiler. Summary of the Utility Model

[0006] The purpose of the embodiments of the utility model is to provide a coke dry quenching boiler and its main steam relief system to improve the safety of the operation of the coke dry quenching boiler. The specific technical solutions are as follows:

[0007] In a first aspect, a main steam relief system of a coke dry quenching boiler provided by an embodiment of the present solution includes:

[0008] A main steam pipeline, including a first steam inlet end and a first steam outlet end. The first steam inlet end is connected to the steam outlet of the coke dry quenching boiler, and the first steam outlet end is connected to the steam inlet of the steam turbine unit;

[0009] A pressure regulating and relief pipeline, including a second steam inlet end and a second steam outlet end. The second steam inlet end is connected to the main steam pipeline, and the second steam outlet end is connected to a silencer;

[0010] A first shut-off valve and a regulating valve are arranged in series or in parallel on the pressure regulating and discharging pipeline. The opening degree of the regulating valve is adjustable and is used to adjust the steam discharging flow rate of the pressure regulating and discharging pipeline according to the opening degree of the regulating valve. Among them,

[0011] When the dry quenching coke boiler is under rated load, the evaporation amount generated per hour is Q1. When the regulating valve is at the maximum opening degree, the maximum steam discharging amount per hour is Q2, and 0.8 ≤ Q2 / Q1 ≤ 1;

[0012] The regulating valve is a pneumatic valve, and the time taken for the opening degree of the regulating valve to open from 0% to 100% is t1;

[0013] The time taken for the first shut-off valve to shut off and then open the pressure regulating and discharging pipeline is t2;

[0014] t1 < t2.

[0015] In some embodiments, 5 s ≤ t1 ≤ 12 s.

[0016] In some embodiments, 30 s ≤ t2 ≤ 40 s.

[0017] In some embodiments, a second shut-off valve is arranged on the pressure regulating and discharging pipeline. Along the steam discharging direction of the pressure regulating and discharging pipeline, the second shut-off valve and the first shut-off valve are connected in series on the pressure regulating and discharging pipeline.

[0018] In some embodiments, the first shut-off valve is an air exhausting electric globe valve, and the second shut-off valve is an electric gate valve or an electric globe valve.

[0019] In some embodiments, the regulating valve and the first shut-off valve are connected in series on the pressure regulating and discharging pipeline, and the regulating valve is located between the first shut-off valve and the second shut-off valve.

[0020] In some embodiments, the first shut-off valve and the regulating valve are connected in parallel on the pressure regulating and discharging pipeline, and the first shut-off valve is an electric valve.

[0021] In some embodiments, the pressure regulating and discharging pipeline includes a main discharging pipeline and a branch discharging pipeline;

[0022] The first shut-off valve and the second shut-off valve are arranged on the main discharging pipeline;

[0023] The regulating valve is arranged on the branch discharging pipeline;

[0024] Both ends of the branch discharging pipeline are communicated with the first shut-off valve.

[0025] In some embodiments, a third shut-off valve is arranged on the main steam pipeline;

[0026] A by-pass steam pipeline, which is in parallel with the third shut-off valve, and both ends of the by-pass steam pipeline are communicated with those of the third shut-off valve;

[0027] A manual valve and an electric valve are arranged on the by-pass steam pipeline.

[0028] In a second aspect, a coke dry quenching boiler provided by an embodiment of the present solution includes:

[0029] The main steam relief system of the above-mentioned coke dry quenching boiler.

[0030] The coke dry quenching boiler and its main steam relief system provided by an embodiment of the present utility model. The main steam relief system of the coke dry quenching boiler includes a main steam pipeline and a pressure-regulating relief pipeline. The main steam pipeline includes a first steam inlet end and a first steam outlet end. The first steam inlet end is connected to the steam outlet of the coke dry quenching boiler, and the first steam outlet end is connected to the steam inlet of the steam turbine unit; the pressure-regulating relief pipeline includes a second steam inlet end and a second steam outlet end. The second steam inlet end is connected to the main steam pipeline, and the second steam outlet end is connected to a silencer; a first shut-off valve and a regulating valve connected in series or in parallel are arranged on the pressure-regulating relief pipeline. The opening degree of the regulating valve is adjustable and is used to adjust the exhaust steam flow rate of the pressure-regulating relief pipeline according to the opening degree of the regulating valve. Among them, when the coke dry quenching boiler is under the rated load, the evaporation amount per hour is Q1, and when the regulating valve is at the maximum opening degree, the maximum exhaust steam amount per hour is Q2, and 0.8 ≤ Q2 / Q1 ≤ 1; the regulating valve is a pneumatic valve, and the time taken for the opening degree of the regulating valve to open from 0% to 100% is t1; the time taken for the first shut-off valve to open the pressure-regulating relief pipeline from the closed state is t2; t1 < t2. In the embodiment of the present solution, 0.8 ≤ Q2 / Q1 ≤ 1, so that per hour, the maximum exhaust steam amount Q2 of the regulating valve matches the evaporation amount Q2 generated by the coke dry quenching boiler under the rated load. Compared with a conventional electric globe valve, since the regulating valve has the characteristics of fast opening degree adjustment speed and accurate opening degree adjustment, by adjusting the opening degree of the regulating valve to adjust the exhaust steam flow rate of the pressure-regulating relief pipeline, it can more quickly and accurately adapt to the discharge of the steam generated by the coke dry quenching boiler, so as to realize the rapid and accurate pressure reduction of the main steam pipeline, and improve the operation safety of the coke dry quenching boiler.

[0031] Certainly, when implementing any product of the present utility model, it is not necessarily required to achieve all the above-mentioned advantages simultaneously. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of the main steam relief system of a coke dry quenching boiler provided by an embodiment of this solution;

[0034] Figure 2 It is a schematic structural diagram of another main steam relief system of a coke dry quenching boiler provided by an embodiment of this solution.

[0035] The reference numerals are as follows:

[0036] Main steam pipeline 10, bypass steam pipeline 11, pressure regulating and relief pipeline 20, main relief pipeline 21, branch relief pipeline 22, first on-off valve 31, regulating valve 32, second on-off valve 33, third on-off valve 34, manual valve 35, electric valve 36;

[0037] Coke dry quenching boiler 201, steam turbine unit 202, silencer 203;

[0038] Exhaust direction a. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of the present utility model.

[0040] In related technologies, there are various types of valves, such as electric globe valves and regulating valves.

[0041] The electric globe valve is mainly used to cut off or connect the medium flow. Taking the gate valve as an example, there is a gate plate opening and closing member inside the valve body of the gate valve. The movement direction of the gate plate is perpendicular to the fluid direction. Since it can block water like a water gate, it is named a gate valve.

[0042] The regulating valve is a valve used to adjust process parameters such as the medium flow rate, pressure, temperature, and liquid level in the field of industrial automation process control. Generally, according to the control signal in the automation system, the opening of the valve is automatically adjusted to achieve the adjustment of the medium flow rate and pressure.

[0043] Among them, the switching speed of the electric globe valve is relatively slow. In the main steam relief system of the coke dry quenching boiler in related technologies, the time taken for the electric globe valve to go from fully closed to fully open is generally more than 30 seconds, while the time taken for the regulating valve to go from fully closed to fully open is generally less than 10 seconds, and the time difference between the two is relatively large.

[0044] Therefore, when the steam turbine unit is not in power generation or the steam consumption of the desuperheating and pressure-reducing device is small, most of the steam generated by the coke dry quenching boiler needs to be discharged through the pressure-regulating and discharging pipeline. If the pressure of the main steam pipeline rises sharply and the regulating valve determined by 15% of the rated load cannot meet the pressure-relieving demand when opened alone (most of the steam needs to be discharged in the main steam discharge system, and the flow rate of the pneumatic regulating valve participating in the regulation at this time is far from enough), since it takes a long time to open the electric stop valve and it is difficult to quickly reduce the pressure of the main steam pipeline, obviously this discharge method is not conducive to the safe operation of the coke dry quenching boiler.

[0045] For this reason, the embodiment of the present application provides a coke dry quenching boiler and its main steam discharge system, and the main purpose is to improve the safety of the operation of the coke dry quenching boiler.

[0046] To better understand the present application, the main steam discharge system of the coke dry quenching boiler according to the embodiment of the present application will be described in detail below.

[0047] Figure 1 It is a schematic structural diagram of a main steam discharge system of a coke dry quenching boiler provided by an embodiment of the present solution. As Figure 1 shown, the main steam discharge system of the coke dry quenching boiler includes: a main steam pipeline 10 and a pressure-regulating and discharging pipeline 20.

[0048] The main steam pipeline 10 includes a first steam inlet end and a first steam outlet end. The first steam inlet end is connected to the steam outlet of the coke dry quenching boiler 201, and the first steam outlet end is connected to the steam inlet of the steam turbine unit 202; the pressure-regulating and discharging pipeline 20 includes a second steam inlet end and a second steam outlet end. The second steam inlet end is connected to the main steam pipeline 10, and the second steam outlet end is connected to the silencer 203; a first switch valve 31 and a regulating valve 32 are connected in series on the pressure-regulating and discharging pipeline 20. The opening degree of the regulating valve 32 is adjustable and is used to adjust the steam discharge flow rate of the pressure-regulating and discharging pipeline 20 according to the opening degree of the regulating valve 32. Among them, under the rated load, the evaporation capacity per hour of the coke dry quenching boiler 201 is Q1, and the maximum steam discharge capacity per hour of the regulating valve 32 at the maximum opening degree is Q2, and 0.8 ≤ Q2 / Q1 ≤ 1. For example, the ratio of Q2 / Q1 can be 0.8, 0.9 or 1.

[0049] Among them, the rated load of the coke dry quenching boiler 201 refers to the ability to generate steam per unit time. When the actual load is equal to the rated load, it is called "full load" or "full capacity"; when the actual load is less than the rated load, it is called "low load"; when the actual load exceeds the rated load, it is called "overload". The load usually refers to the evaporation capacity (kilograms per hour, or tons per hour) generated by the coke dry quenching boiler 201.

[0050] Taking the rated load of the coke dry quenching boiler 201 as 100 tons per hour as an example, when Q2 / Q1 = 1, with the regulating valve 32 at its maximum opening, the steam discharge flow rate can be 100 tons per hour.

[0051] The regulating valve 32 is a pneumatic valve, which is convenient for realizing the rapid adjustment of the regulating valve 32. The time taken for the opening of the regulating valve 32 to increase from 0% to 100% is t1; the time taken for the first switching valve 31 to open the pressure regulating and discharging pipeline 20 from the closed state is t2; t1 < t2.

[0052] In the embodiment of this solution, the first switching valve 31 and the regulating valve 32 are connected in series on the pressure regulating and discharging pipeline 20, and the first switching valve 31 can be in the normally open state. Since every hour, the maximum steam discharge volume Q2 of the regulating valve 32 matches the evaporation volume Q2 generated by the coke dry quenching boiler 201 at the rated load (0.8 ≤ Q2 / Q1 ≤ 1), when the pressure of the main steam pipeline 10 increases and pressure reduction is required, by adjusting the opening of the regulating valve 32, the steam discharge flow rate of the pressure regulating and discharging pipeline 20 is adjusted. Since the regulating valve 32 has the characteristics of fast opening adjustment speed and accurate opening adjustment, it can more quickly and accurately adapt to the discharge of the steam generated by the coke dry quenching boiler 201, so as to realize the rapid and accurate pressure reduction of the main steam pipeline 10 and improve the operation safety of the coke dry quenching boiler 201. In addition, compared with the prior art, the operation steps of cooperating with the opening of the electric stop valve are omitted, which can simplify the operation process of the operating personnel.

[0053] In some embodiments, 5 seconds ≤ t1 ≤ 12 seconds. For example, t1 can be 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds, 11 seconds or 12 seconds. In this embodiment, the opening time of the regulating valve 32 is relatively fast, and the pressure regulating and discharging pipeline 20 can discharge steam quickly, so that the rapid pressure reduction of the main steam pipeline 10 can be realized.

[0054] In some embodiments, 30 seconds ≤ t2 ≤ 40 seconds. For example, t2 can be 30 seconds, 32 seconds, 34 seconds, 36 seconds, 38 seconds, 40 seconds.

[0055] In some embodiments, a second switching valve 33 is provided on the pressure regulating and discharging pipeline 20. Along the steam discharge direction a of the pressure regulating and discharging pipeline 20, the second switching valve 33 and the first switching valve 31 are connected in series on the pressure regulating and discharging pipeline 20. The second switching valve 33 can be used as the maintenance valve of the main steam discharging system of the coke dry quenching boiler 201. The second switching valve 33 is normally open. When the first switching valve 31 and the regulating valve 32 need to be maintained, the second switching valve 33 is closed, and then the maintenance operations of the first switching valve 31 and the regulating valve 32 can be conveniently carried out.

[0056] In some embodiments, the first switching valve 31 is an exhaust-to-atmosphere motorized globe valve, and the second switching valve 33 is a motorized gate valve or a motorized globe valve. The exhaust-to-atmosphere motorized globe valve has good erosion resistance characteristics, improving the safe operation of the boiler unit.

[0057] In some embodiments, the regulating valve 32 and the first switching valve 31 are connected in series in the pressure regulating and discharging pipeline 20, and the regulating valve 32 is located between the first switching valve 31 and the second switching valve 33. The first switching valve 31 and the second switching valve 33 can simultaneously serve as maintenance valves for the main steam discharging system of the coke dry quenching boiler 201. The first switching valve 31 and the second switching valve 33 are normally open. When the regulating valve 32 needs to be maintained, the first switching valve 31 and the second switching valve 33 are closed, and then the maintenance operation of the regulating valve 32 can be conveniently carried out.

[0058] In addition, since the airtightness of the regulating valve 32 is less than that of the second switching valve 33, in some cases, in order to increase the power generation of the steam turbine unit 202 (reduce the steam leaked from the closed regulating valve 32), the second switching valve 33 can also be closed to improve the airtightness of the pressure regulating and discharging pipeline 20, improve the utilization rate of the steam generated by the coke dry quenching boiler 201, and thus increase the power generation of the steam turbine unit 202.

[0059] In some embodiments, a third switching valve 34 is provided on the main steam pipeline 10; a bypass steam pipeline 11, which is connected in parallel with the third switching valve 34, and both ends of the bypass steam pipeline 11 are communicated with those of the third switching valve 34; a manual valve 35 and an electric valve 36 are provided on the bypass steam pipeline 11.

[0060] Among them, the third switching valve 34 can be used to connect and cut off the main steam pipeline 10 to control the supply or stop of steam from the coke dry quenching boiler 201 to the steam turbine unit 202. The manual valve 35 of the bypass steam pipeline 11 can be in the normally open state. During the startup process of the coke dry quenching boiler 201, the temperature of the main steam pipeline 10 changes from low to high. By opening the electric valve 36, it is beneficial to avoid the stress concentration problem caused by excessive local temperature of the main steam pipeline 10 and facilitate the improvement of the service life of the main steam pipeline 10. The manual valve 35 can be used as a standby valve. When the electric valve 36 fails, it is convenient to control the opening and closing of the bypass steam pipeline 11 through the manual valve 35.

[0061] In some embodiments, any one of the first switching valve 31, the second switching valve 33, or the third switching valve 34 can be an electric gate valve, an electric globe valve, or an electric cut-off valve.

[0062] Figure 2 Another structural schematic diagram of the main steam discharging system of the coke dry quenching boiler 201 provided by the embodiment of this solution is as Figure 2As shown, different from the series connection of the first shut-off valve 31 and the regulating valve 32 in the main steam relief system of the coke dry quenching boiler 201 described in the above embodiment on the pressure regulating and relief pipeline 20, in this embodiment, the first shut-off valve 31 and the regulating valve 32 are arranged in parallel on the pressure regulating and relief pipeline 20.

[0063] In the embodiment of this solution, the first shut-off valve 31 and the regulating valve 32 are arranged in parallel on the pressure regulating and relief pipeline 20, and the first shut-off valve 31 can be in a normally closed state. Since every hour, the maximum steam exhaust volume Q2 of the regulating valve 32 matches the evaporation volume Q1 generated by the coke dry quenching boiler 201 under the rated load (0.8 ≤ Q2 / Q1 ≤ 1), when the pressure of the main steam pipeline 10 increases and pressure reduction is required, the opening of the regulating valve 32 is adjusted to adjust the steam exhaust flow of the pressure regulating and relief pipeline 20. Since the regulating valve 32 has the characteristics of fast opening adjustment speed and accurate opening adjustment, it can more quickly and accurately adapt to the discharge of the steam generated by the coke dry quenching boiler 201, so as to realize the rapid and accurate pressure reduction of the main steam pipeline 10 and improve the operation safety of the coke dry quenching boiler 201. In addition, compared with the prior art, the operation step of cooperating with the opening of the electric stop valve is omitted, which can simplify the operation process of the operating personnel. Moreover, since the first shut-off valve 31 and the regulating valve 32 are arranged in parallel, the first shut-off valve 31 and the regulating valve 32 can also be opened simultaneously, and the two cooperate to exhaust steam externally. Compared with the technical solution of the series connection of the first shut-off valve 31 and the regulating valve 32, the requirement for the steam exhaust flow capacity of the regulating valve 32 can be reduced, which is convenient for selecting a regulating valve 32 with a smaller diameter, thereby reducing the cost of the main steam relief system.

[0064] In some embodiments, the pressure regulating and relief pipeline 20 includes a main relief pipeline 21 and a branch relief pipeline 22; the first shut-off valve 31 and the second shut-off valve 33 are arranged on the main relief pipeline 21; the regulating valve 32 is arranged on the branch relief pipeline 22; both ends of the branch relief pipeline 22 are communicated with the first shut-off valve 31.

[0065] Among them, the branch relief pipeline 22 is semi-circular. Along the steam exhaust direction a, the branch relief pipeline 22 includes a first bend and a second bend. The regulating valve 32 is arranged between the first bend and the second bend. After the steam in the main relief pipeline 21 enters the semi-circular branch relief pipeline 22, it first impacts the first bend, and then is exhausted externally through the regulating valve 32, the second bend, the main relief pipeline 21, and the silencer 203. Thus, the steam entering the semi-circular branch relief pipeline 22 is first slowed down by the impact of the first bend, and the slowed-down steam enters the regulating valve 32, which can reduce the impact force of the steam on the regulating valve 32 and is beneficial to improving the service life of the regulating valve 32.

[0066] In the second aspect, an embodiment of this solution provides a coke dry quenching boiler, including: the main steam relief system of the above-mentioned coke dry quenching boiler.

[0067] The coke dry quenching boiler provided by the embodiment of the present utility model, wherein the main steam relief system of the coke dry quenching boiler comprises: a main steam pipeline and a pressure regulating and relief pipeline. The main steam pipeline comprises a first steam inlet end and a first steam outlet end. The first steam inlet end is connected to the steam outlet of the coke dry quenching boiler, and the first steam outlet end is connected to the steam inlet of the steam turbine unit; the pressure regulating and relief pipeline comprises a second steam inlet end and a second steam outlet end. The second steam inlet end is connected to the main steam pipeline, and the second steam outlet end is connected to a silencer; a first on-off valve and a regulating valve are arranged in series or in parallel on the pressure regulating and relief pipeline. The opening degree of the regulating valve is adjustable and is used for adjusting the exhaust steam flow of the pressure regulating and relief pipeline according to the opening degree of the regulating valve. Wherein, when the coke dry quenching boiler is under the rated load, the evaporation capacity per hour is Q1, and when the regulating valve is at the maximum opening degree, the maximum exhaust steam volume per hour is Q2, and 0.8 ≤ Q2 / Q1 ≤ 1; the regulating valve is a pneumatic valve, and the time taken for the opening degree of the regulating valve to open from 0% to 100% is t1; the time taken for the first on-off valve to turn on the pressure regulating and relief pipeline from being shut off is t2; t1 < t2. In the embodiment of this solution, 0.8 ≤ Q2 / Q1 ≤ 1, so that per hour, the maximum exhaust steam volume Q2 of the regulating valve matches the evaporation capacity Q2 generated by the coke dry quenching boiler under the rated load. Compared with the conventional electric globe valve, since the regulating valve has the characteristics of fast opening degree adjustment speed and accurate opening degree adjustment, by adjusting the exhaust steam flow of the pressure regulating and relief pipeline through the opening degree of the regulating valve, it can more quickly and accurately adapt to the discharge of the steam generated by the coke dry quenching boiler, so as to realize the rapid and accurate pressure reduction of the main steam pipeline, and improve the operation safety of the coke dry quenching boiler.

[0068] The above is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. A main steam release system for a dry coke quenching boiler, characterized in that: include: A main steam pipeline (10) comprises a first steam inlet end and a first steam outlet end, wherein the first steam inlet end is connected to the steam outlet of the dry coke quenching boiler (201), and the first steam outlet end is connected to the steam inlet of the steam turbine unit (202); A pressure regulating and releasing pipeline (20) comprises a second steam inlet end and a second steam outlet end, wherein the second steam inlet end is connected to the main steam pipeline (10), and the second steam outlet end is connected to a muffler (203); The pressure regulating and releasing pipeline (20) is provided with a first switch valve (31) and a regulating valve (32) connected in series or in parallel, and the opening of the regulating valve (32) is adjustable, and is used to adjust the exhaust steam flow of the pressure regulating and releasing pipeline (20) according to the opening of the regulating valve (32), wherein: The dry coke quenching boiler (201) generates an evaporation amount of Q1 per hour under rated load, and the regulating valve (32) generates a maximum exhaust steam amount of Q2 per hour under maximum opening, 0.8≤Q2 / Q1≤1; The regulating valve (32) is a pneumatic valve, and the time taken for the opening of the regulating valve (32) to change from 0% to 100% is t1; The time taken for the first switch valve (31) to go from closing to opening the pressure regulating and releasing pipeline (20) is t2; t1<t2。 2. The main steam release system of the dry coke quenching boiler according to claim 1 is characterized in that: 5 seconds ≤ t1 ≤ 12 seconds.

3. The main steam release system of the dry coke quenching boiler according to claim 1 is characterized in that: 30 seconds ≤ t2 ≤ 40 seconds.

4. The main steam release system of the dry coke quenching boiler according to claim 1, characterized in that: A second switch valve (33) is provided on the pressure regulating and releasing pipeline (20), and along the exhaust direction (a) of the pressure regulating and releasing pipeline (20), the second switch valve (33) and the first switch valve (31) are connected in series to the pressure regulating and releasing pipeline (20).

5. The main steam release system of the dry coke quenching boiler according to claim 4, characterized in that: The first switch valve (31) is an electric stop valve for exhausting steam to air, and the second switch valve (33) is an electric gate valve or an electric stop valve.

6. The main steam release system of the dry coke quenching boiler according to claim 4, characterized in that: The regulating valve (32) and the first switch valve (31) are connected in series to the pressure regulating and releasing pipeline (20), and the regulating valve (32) is located between the first switch valve (31) and the second switch valve (33).

7. The main steam release system of the dry coke quenching boiler according to claim 4, characterized in that: The first switch valve (31) and the regulating valve (32) are connected in parallel to the pressure regulating and releasing pipeline (20), and the first switch valve (31) is an electric valve.

8. The main steam release system of the dry coke quenching boiler according to claim 7, characterized in that: The pressure regulating and releasing pipeline (20) comprises a main releasing pipeline (21) and a branch releasing pipeline (22); The first on-off valve (31) and the second on-off valve (33) are arranged in the main relief pipe (21); The regulating valve (32) is arranged on the branch discharge pipeline (22); The branch release pipe (22) and the first switch valve (31) are connected at both ends.

9. The main steam release system of the CDQ boiler according to any one of claims 1 to 8, characterized in that: The main steam pipeline (10) is provided with a third switch valve (34); A bypass steam pipeline (11) is connected in parallel with the third switch valve (34), and both ends of the bypass steam pipeline (11) and the third switch valve (34) are in communication; The bypass steam pipeline (11) is provided with a manual valve (35) and an electric valve (36).

10. A dry coke quenching boiler, characterized in that: include: The main steam release system of the dry quenching boiler (201) according to any one of claims 1 to 9.

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