A thermal system for automatic control of the temperature of the flue gas at the outlet of a dry quenching boiler

Abstract

The utility model discloses a kind of dry quenching boiler outlet flue gas temperature automatic control's thermodynamic system, it is related to boiler equipment technical field, including: feedwater bypass pipeline, its inlet water end is communicated on the economizer inlet water main pipe of economizer inlet header water side, its outlet water end is communicated on the economizer outlet water main pipe of economizer outlet header outlet water side, electric valve is equipped on feedwater bypass pipeline;Temperature monitoring mechanism, it is installed at boiler outlet, for monitoring boiler outlet flue gas temperature;Controller, it is electrically connected with temperature monitoring mechanism and electric valve, it aims at through the mode of intelligent temperature monitoring combination feedwater flow automatic regulation, to solve the problem that dry quenching boiler exhaust gas temperature is too low, causes economizer tube bundle leakage.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to a thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler. Background Technology

[0002] Coking plants employing a fully dry-quenching process face complex operating conditions for their dry-quenched coke boilers. The boiler outlet flue gas temperature may consistently remain below 160℃, easily leading to low-temperature corrosion at the economizer location, damaging the economizer tube bundle structure and stability. Prolonged operation under these conditions can cause economizer tube bundle leaks, forcing boiler shutdown for maintenance, resulting in economic losses and impacting production safety. Currently, the industry primarily addresses the problem of low-temperature corrosion in economizers caused by excessively low flue gas temperatures in dry-quenched coke boilers by changing the economizer tube bundle material, such as replacing conventional tubes with corrosion-resistant materials to improve the corrosion resistance of the heating surfaces. However, this method is a passive protection measure and cannot change the low-temperature corrosion environment at the boiler tail end, failing to fundamentally solve the problem of furnace tube leaks caused by low-temperature corrosion. Utility Model Content

[0003] The purpose of this invention is to provide a thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler, in order to solve the problems existing in the prior art. It aims to solve the problem of excessively low flue gas temperature in dry quenching coke boilers, which causes leakage in the economizer tube bundle, by combining intelligent temperature monitoring with automatic adjustment of feedwater flow.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a thermal system for automatic control of the outlet flue gas temperature of a dry quenching coke boiler, comprising: The water supply bypass pipeline has its inlet end connected to the economizer inlet header on the water supply side of the economizer inlet header, and its outlet end connected to the economizer outlet header on the water supply side of the economizer outlet header. An electric valve is provided on the water supply bypass pipeline. A temperature monitoring device, installed at the boiler outlet, is used to monitor the temperature of the flue gas at the boiler outlet. The controller is electrically connected to the temperature monitoring mechanism and the electric valve.

[0005] Preferably, the water supply bypass pipeline is further provided with two first shut-off valves, which are respectively arranged on both sides of the electric valve along the water flow direction.

[0006] Preferably, the water supply bypass pipeline is also connected to a pressure relief bypass, the inlet end of which is located between the electric valve and any one of the first shut-off valves, and a pressure relief valve is provided on the pressure relief bypass.

[0007] Preferably, the water supply bypass pipeline is connected in parallel with a regulating bypass, the inlet end of the regulating bypass is connected to the economizer inlet header, and its outlet end is connected to the economizer outlet header. A second shut-off valve is provided on the regulating bypass.

[0008] Preferably, the second shut-off valve is, but is not limited to, a manually operated shut-off valve.

[0009] Preferably, the first shut-off valve is, but is not limited to, a gate valve.

[0010] Preferred options also include: A check valve is connected between the outlet end of the economizer outlet header and the economizer outlet header, and the outlet end of the water supply bypass pipeline is located on the outlet side of the check valve.

[0011] Preferred options also include: A temperature indicator is installed synchronously with the temperature monitoring mechanism at the boiler outlet to directly display the boiler outlet flue gas temperature.

[0012] The present invention achieves the following technical advantages over the prior art: This invention monitors the boiler outlet flue gas temperature in real time through a temperature monitoring mechanism and automatically adjusts the boiler feedwater flow through the economizer. It controls the boiler outlet flue gas temperature to remain above the preset value under any operating condition, thereby suppressing corrosion of the economizer heating surface, preventing boiler tube leakage, automatically responding to boiler production fluctuations caused by changes in dry quenching load, enhancing the safety and reliability of dry quenching boiler operation, achieving the goal of safe, stable, and automated operation, extending the service life of the economizer tail heating surface tube bundle, and reducing maintenance costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram showing the connection between the thermal system for automatic temperature control of the outlet flue gas of the dry quenching coke boiler and the boiler system in an example disclosed in this utility model. Among them, 1-boiler outlet, 2-economizer outlet header, 3-economizer inlet header, 4-feedwater bypass pipeline, 5-regulating bypass, 6-electric valve, 7-first shut-off valve, 8-pressure relief valve, 9-check valve, 10-second shut-off valve, 11-temperature monitoring mechanism, 12-temperature indicator. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] The purpose of this invention is to provide a thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler, in order to solve the problems existing in the prior art. It aims to solve the problem of excessively low flue gas temperature in dry quenching coke boilers, which causes leakage in the economizer tube bundle, by combining intelligent temperature monitoring with automatic adjustment of feedwater flow.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1As shown, this utility model provides a thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler, including a feedwater bypass pipe 4, a temperature monitoring mechanism 11, and a controller. The inlet end of the feedwater bypass pipe 4 is connected to the economizer inlet header 3 on the water supply side, and its outlet end is connected to the economizer outlet header 2 on the water supply side. The economizer inlet header 3 is connected to the feedwater pump of the main feedwater through the economizer inlet header, and the economizer outlet header 2 is connected to the boiler drum through the economizer outlet header. An electric valve 6 is provided on the feedwater bypass pipe 4. The temperature monitoring mechanism 11 is installed at the boiler outlet 1 to monitor the flue gas temperature at the boiler outlet. Preferably, the temperature monitoring mechanism 11 is, but is not limited to, a temperature sensor. The controller is electrically connected to the temperature monitoring mechanism 11 and the electric valve 6. The electrical connection method includes, but is not limited to, cable connection and wireless transmission connection. By setting the controller, the electric valve 6 and the temperature monitoring mechanism 11 are interlocked to realize the automatic control of the outlet flue gas temperature. The present invention discloses a thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler. The system connects a feedwater bypass pipe 4 to the inlet side of the economizer inlet header 3 and the outlet side of the economizer outlet header 2. When the temperature monitoring mechanism 11 detects that the temperature of the flue gas at the boiler outlet is lower than a preset value, the controller acquires this parameter and controls the electric valve 6 to open. Part of the feedwater enters the boiler drum through the feedwater bypass pipe 4, no longer entering the economizer to absorb heat from the flue gas, thereby increasing the temperature of the flue gas at the boiler outlet. When the temperature monitoring mechanism 11 detects that the temperature of the flue gas at the boiler outlet reaches or exceeds the preset value, the controller acquires this parameter and controls the electric valve 6 to close. The feedwater no longer enters the boiler drum through the feedwater bypass pipe 4 and instead completely enters the economizer to absorb heat from the flue gas, thus realizing the recovery and utilization of the thermal energy of the flue gas at the boiler outlet. This invention uses a temperature monitoring mechanism 11 to monitor the boiler outlet flue gas temperature in real time and automatically adjusts the boiler feedwater flow through the economizer. It controls the boiler outlet flue gas temperature to remain above the preset value under any operating condition, thereby suppressing corrosion of the economizer heating surface, preventing leakage of the economizer tubes, automatically responding to boiler production fluctuations caused by changes in dry quenching load, enhancing the safety and reliability of dry quenching boiler operation, achieving the goal of safe, stable, and automated operation, extending the service life of the economizer tail heating surface tube bundle, and reducing maintenance costs.

[0019] It should also be noted that if the production load fluctuates significantly, the interlock between the outlet flue gas temperature and the operation of electric valve 6 should be cancelled.

[0020] In this embodiment, the preset value of the boiler outlet flue gas temperature is preferably 160℃, because the boiler outlet flue gas temperature may be lower than 160℃ for a long time, which can easily lead to low-temperature corrosion at the economizer location, damaging the economizer tube bundle structure and stability. However, in this embodiment, the preset value of the boiler outlet flue gas temperature is not limited to 160℃ and can be adjusted according to the actual boiler operating conditions.

[0021] In this embodiment, the electric valve 6 is, but is not limited to, an electric shut-off valve and an electric regulating valve, and preferably an electric regulating valve to improve the regulating accuracy.

[0022] In one specific embodiment, the water supply bypass pipeline 4 is further equipped with two first shut-off valves 7. The two first shut-off valves 7 are respectively arranged on both sides of the electric valve 6 along the water flow direction. When it is necessary to isolate, maintain, or repair the electric valve 6, the water flow and pressure on both sides of the electric valve 6 are cut off by closing the two first shut-off valves 7, so as to facilitate the disassembly and assembly of the electric valve 6 and prevent it from being affected by the water flow in the water supply bypass pipeline 4. The first shut-off valves 7 are, but are not limited to, gate valves. The gate valves can be electric gate valves or manual gate valves. To ensure reliability during maintenance, manual gate valves are preferred to ensure that the water flow and pressure on both sides of the electric valve 6 are cut off.

[0023] In this embodiment, the water supply bypass pipeline 4 is also connected to a pressure relief bypass. The inlet end of the pressure relief bypass is located between the electric valve 6 and any one of the first shut-off valves 7. A pressure relief valve 8 is provided on the pressure relief bypass. By setting up the pressure relief bypass and the pressure relief valve 8, the water supply bypass pipeline 4 is drained and depressurized when the electric valve 6 is under maintenance, which facilitates the disassembly and assembly of the electric valve 6, so as to isolate, maintain and repair the electric valve 6.

[0024] In this embodiment, a regulating bypass 5 is connected in parallel to the feedwater bypass pipeline 4. The inlet end of the regulating bypass 5 is connected to the economizer inlet header, and its outlet end is connected to the economizer outlet header. A second shut-off valve 10 is installed on the regulating bypass 5. By adding the regulating bypass 5, it can be put into operation when the electric valve 6 is under maintenance, allowing some feedwater to return through the regulating bypass 5 without passing through the economizer, thus enhancing the safety and reliability of system operation. In this embodiment, the second shut-off valve 10 is, but is not limited to, a manual shut-off valve. By setting a manual shut-off valve, the safety and reliability of system operation are further enhanced.

[0025] In one specific embodiment, a check valve 9 is also included, which is connected between the outlet end of the economizer outlet header 2 and the economizer outlet header. The outlet end of the feedwater bypass pipe 4 is located on the outlet side of the check valve 9. By setting the check valve 9, water discharged through the outlet end of the feedwater bypass pipe 4 is prevented from flowing back into the economizer. Furthermore, a regulating bypass 5 is connected in parallel to the feedwater bypass pipe 4. The inlet end of the regulating bypass 5 is connected to the economizer inlet header, and its outlet end is connected to the economizer outlet header. A second shut-off valve 10 is provided on the regulating bypass 5. The outlet end of the regulating bypass 5 is also located on the outlet side of the check valve 9 to prevent water discharged through the outlet end of the regulating bypass 5 from flowing back into the economizer.

[0026] In one specific embodiment, a temperature indicator 12 is also included, which is installed synchronously with the temperature monitoring mechanism 11 at the boiler outlet 1 to directly display the boiler outlet flue gas temperature. By setting the temperature indicator 12 to assist in monitoring the boiler outlet flue gas temperature, the automatic adjustment of water flow in the entire system is avoided due to damage to the temperature monitoring mechanism 11.

[0027] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0028] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler, characterized in that, include: The water supply bypass pipeline has its inlet end connected to the economizer inlet header on the water supply side of the economizer inlet header, and its outlet end connected to the economizer outlet header on the water supply side of the economizer outlet header. An electric valve is provided on the water supply bypass pipeline. A temperature monitoring device, installed at the boiler outlet, is used to monitor the temperature of the flue gas at the boiler outlet. The controller is electrically connected to the temperature monitoring mechanism and the electric valve.

2. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 1, characterized in that, The water supply bypass pipeline is also equipped with two first shut-off valves, which are respectively located on both sides of the electric valve along the water flow direction.

3. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 2, characterized in that, The water supply bypass pipeline is also connected to a pressure relief bypass. The inlet end of the pressure relief bypass is located between the electric valve and any one of the first shut-off valves, and a pressure relief valve is provided on the pressure relief bypass.

4. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 2 or 3, characterized in that, The water supply bypass pipeline is connected in parallel with a regulating bypass. The inlet end of the regulating bypass is connected to the economizer inlet header, and its outlet end is connected to the economizer outlet header. A second shut-off valve is provided on the regulating bypass.

5. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 4, characterized in that, The second shut-off valve is, but is not limited to, a manually operated shut-off valve.

6. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 4, characterized in that, The first shut-off valve is, but is not limited to, a gate valve.

7. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 1, characterized in that, Also includes: A check valve is connected between the outlet end of the economizer outlet header and the economizer outlet header, and the outlet end of the water supply bypass pipeline is located on the outlet side of the check valve.

8. The thermal system for automatic control of flue gas temperature at the outlet of a dry quenching coke boiler according to claim 1, characterized in that, Also includes: A temperature indicator is installed synchronously with the temperature monitoring mechanism at the boiler outlet to directly display the boiler outlet flue gas temperature.

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