A boiler superheater control system and control method

Abstract

This application discloses a boiler superheater control system and control method. The method includes: a burner, a detector, a pressure regulating valve, a soot blower, a superheater, upper and lower boiler drums, and a vent pipe. The vent pipe is connected to the burner, the detector, the pressure regulating valve, the soot blower, the superheater, and the upper and lower boiler drums. The detector is electrically connected to the pressure regulating valve and the soot blower. The superheater is electrically connected to the detector, the pressure regulating valve, and the soot blower. The detector detects the gas content at the superheater inlet and sends the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve based on the detection signal, and controls the operation of the soot blower based on the opening and closing of the pressure regulating valve to reduce the gas temperature inside the superheater, thereby protecting the superheater.

Description

Technical Field

[0001] This application relates to the field of mechanical manufacturing, and more particularly to a boiler superheater control system and control method. Background Technology

[0002] Boilers are an important production process in the thermal system and also an important equipment for the utilization of waste energy in steel enterprises. However, due to environmental protection requirements at different times, the operating hours of gas generating equipment such as blast furnaces, converters, and coke ovens fluctuate, resulting in changes in the amount of gas generated. When the amount of gas generated is low, some boilers need to be shut down or operate at low load.

[0003] In the existing technology, from the perspective of biomass boiler superheaters, biomass is characterized by containing alkali metals. During the actual combustion of biomass in the boiler, grass biomass raw materials also produce a large amount of highly volatile chemical substances. Under the action of homogeneous reaction, because the temperature of the high-temperature superheater is relatively high at this time, the generated chemical substances gradually condense on the tube wall of the high-temperature superheater, which leads to corrosion of the high-temperature superheater. Under the continuous corrosion, the tube wall of the high-temperature superheater will gradually become thinner, severely damaging the superheater. Summary of the Invention

[0004] This application provides a boiler superheater control system to reduce the occurrence of superheater damage.

[0005] The first aspect of this application provides a boiler superheater control system, including: burners, detectors, pressure regulating valves, soot blowers, superheaters, upper and lower boiler drums, and vent pipes.

[0006] The vent pipe is connected to the burner, the detector, the pressure regulating valve, the soot blower, the superheater, and the upper and lower drums, respectively.

[0007] The detector is electrically connected to the pressure regulating valve and the soot blowing steam generator, respectively;

[0008] The superheater is electrically connected to the detector, the pressure regulating valve, and the soot blowing steam generator, respectively.

[0009] The detector is used to detect the gas content at the inlet of the superheater and send the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve according to the detection signal, and controls the operation of the soot blowing steam generator according to the opening and closing of the pressure regulating valve.

[0010] Optionally, the detector is a temperature detector or an alkali metal gas detector.

[0011] Optionally, the detector is a temperature detector or an alkali metal gas detector, comprising:

[0012] When the detector is a temperature detector, the temperature detector is used to detect the temperature at the inlet of the superheater and send the detected temperature signal to the control system;

[0013] When the detector is an alkali metal gas detector, the alkali metal gas detector is used to detect the alkali metal gas content at the inlet of the superheater and send the detection signal to the control system.

[0014] Optionally, the detector is located at the inlet of the superheater, and the detector is not attached to the superheater.

[0015] Optionally, the detector is provided with a pressure regulating valve and a soot blower on one side. The pressure regulating valve is used to regulate the gas pressure passing through the superheater, and the soot blower is used to reduce the gas temperature inside the superheater.

[0016] Optionally, the superheater is disposed inside the vent pipe, and the superheater is used to process the gas after it has been processed by the soot blower.

[0017] Optionally, an alarm is installed at the bottom of the superheater, which is used to perform an alarm operation when the temperature of the superheater reaches a preset temperature.

[0018] Optionally, when the detection signal sent by the detector meets preset conditions, the pressure regulating valve adjusts the gas pressure through the vent pipe.

[0019] Optionally, when the detection signal sent by the detector meets the preset conditions, the soot blowing steam generator performs a cyclic soot blowing operation.

[0020] Optionally, the detector and the soot blower are made of highly corrosion-resistant materials.

[0021] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This application sets up a control system, including a burner, a detector, a pressure regulating valve, a soot blower, a superheater, upper and lower boiler drums, and a vent pipe. The vent pipe is connected to the burner, detector, pressure regulating valve, soot blower, superheater, and upper and lower boiler drums respectively. The detector is electrically connected to the pressure regulating valve and the soot blower respectively. The superheater is electrically connected to the detector, the pressure regulating valve, and the soot blower respectively. The detector is used to detect the gas content at the superheater inlet and send the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve according to the detection signal. The control system controls the operation of the soot blower according to the opening and closing of the pressure regulating valve. The soot blower circulates air to the superheater to reduce the temperature of the superheater, thus reducing the possibility of damage to the superheater. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the boiler superheater control system in an embodiment of this application. Detailed Implementation

[0023] This application provides a boiler superheater control system to reduce the occurrence of superheater damage.

[0024] The technical solutions of this application 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 this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 The first aspect of this application provides an embodiment of a boiler superheater control system, including: a burner 1, a detector 2, a pressure regulating valve 3, a soot blower 4, a superheater 5, upper and lower boiler drums 6, and a vent pipe 7. The vent pipe 7 is connected to the burner 1, the detector 2, the pressure regulating valve 3, the soot blower 4, the superheater 5, and the upper and lower boiler drums 6, respectively. The detector 2 is electrically connected to the pressure regulating valve 3 and the soot blower 4, respectively. The superheater 5 is electrically connected to the detector 2, the pressure regulating valve 3, and the soot blower 4, respectively. The detector 2 is used to detect the gas content at the inlet of the superheater 5 and send the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve 3 according to the detection signal, and controls the operation of the soot blower 4 according to the opening and closing of the pressure regulating valve 3.

[0026] In practical applications, superheater temperature is a crucial factor affecting corrosion rates. Therefore, to minimize corrosion in biomass boilers' high-temperature superheaters and keep the corrosion rate within a manageable range, proper temperature control of the superheater is essential. In the initial stages of unit operation, the feeding system exhibits numerous instabilities, making comprehensive control challenging and increasing the probability of material blockage. Furthermore, the uneven mixing of different types of biomass fuel during fuel blending severely impacts the stability of the calorific value of the fuel entering the boiler, leading to excessively high superheater temperatures. Studies show that the internal temperature of the superheater can exceed 600 degrees Celsius, a primary factor contributing to superheater corrosion.

[0027] In this embodiment, a control system is added, which includes a detector 2, a pressure regulating valve 3, and a soot blower 4. The detector 2 detects the temperature and alkali metal gas content at the inlet of the superheater 5. When the temperature and alkali metal content reach a certain value, the pressure regulating valve 3 and the soot blower 4 are controlled to reduce the gas temperature passing through the superheater 5, thereby protecting the superheater 5.

[0028] Optionally, detector 2 can be a temperature detector or an alkali metal gas content detector. When detector 2 is a temperature detector, the detected signal is a temperature signal. Because the gas combustion in the vent pipe will cause the temperature to rise, a temperature detector is added to detect the inlet temperature of the superheater and send the detected temperature signal to the control system. The control system controls the operation of the pressure regulating valve 3 according to its own judgment module and control module. The function of the pressure regulating valve 3 is to adjust the gas pressure to reduce the gas combustion environment and control the soot blower 4 to circulate steam to the superheater 5, so that the steam evaporates and reduces the gas temperature inside the superheater 5.

[0029] When detector 2 is an alkali metal gas content detector, it is used to detect whether the alkali metal content in the gas passing through the vent pipe 7 of the superheater 5 reaches a certain preset value, and sends the detection signal to the control system. Similarly, the control system controls the operation of the pressure regulating valve 3 and the soot blowing steamer 4 according to its own judgment module and control module.

[0030] Optionally, the detector 2 is located at the inlet of the superheater 5 and is not attached to the superheater 5. A pressure regulating valve 3 and a soot blower 4 are provided on one side of the detector 2. The pressure regulating valve 3 is used to regulate the gas pressure passing through the superheater 5, and the soot blower 4 is used to reduce the gas temperature inside the superheater 5. The superheater 5 is located inside the vent pipe 7 and is used to process the gas after it has been processed by the soot blower 4. Since the gas generates high temperature when it is burning, the gas processed by the superheater 5 will also generate high temperature. Furthermore, the detector 2 and the soot blower 4 are made of highly corrosion-resistant materials.

[0031] The second aspect of this application provides an embodiment of a boiler superheater control system and control method, including: a burner 1, a detector 2, a pressure regulating valve 3, a soot blower 4, a superheater 5, upper and lower boiler drums 6, and a vent pipe 7. The vent pipe 7 is connected to the burner 1, the detector 2, the pressure regulating valve 3, the soot blower 4, the superheater 5, and the upper and lower boiler drums 6, respectively. The detector 2 is electrically connected to the pressure regulating valve 3 and the soot blower 4, respectively. The superheater 5 is electrically connected to the detector 2, the pressure regulating valve 3, and the soot blower 4, respectively. The detector 2 is used to detect the gas content at the inlet of the superheater 5 and send the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve 3 according to the detection signal, and controls the operation of the soot blower 4 according to the opening and closing of the pressure regulating valve 3.

[0032] Specifically, to effectively prevent the boiler's high-temperature superheater from corroding too quickly and reduce the incidence of storage problems, when the soot blowing steam source pressure of the soot blowing steamer 4 is too high and the water content is too large, the superheater 5 will also be affected during operation. This is because the gas pressure is regulated by the pressure regulating valve 3, which is generally set to 1MPa. At this time, the steam temperature will reach saturation. However, under such circumstances, it is more difficult to drain the condensate, which leads to an increase in the water content in the steam. Therefore, a detector is used to detect the temperature of the superheater 5, thereby controlling the gas inside the superheater 5 and achieving the function of protecting the superheater 5.

[0033] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler superheater control system, characterized in that, include: Burners, detectors, pressure regulating valves, soot blowers, superheaters, upper and lower drums, and vent pipes; The vent pipe is connected to the burner, the detector, the pressure regulating valve, the soot blower, the superheater, and the upper and lower drums, respectively. The detector is electrically connected to the pressure regulating valve and the soot blowing steam generator, respectively; The superheater is electrically connected to the detector, the pressure regulating valve, and the soot blowing steam generator, respectively. The detector is used to detect the gas content at the inlet of the superheater and send the detection signal to the control system. The control system controls the opening and closing of the pressure regulating valve according to the detection signal, and controls the operation of the soot blowing steam generator according to the opening and closing of the pressure regulating valve. The detector is an alkali metal gas detector, which is used to detect the alkali metal gas content at the inlet of the superheater and send the detection signal to the control system. The detector is equipped with a pressure regulating valve and a soot blower on one side. The pressure regulating valve is used to regulate the gas pressure passing through the superheater, and the soot blower is used to reduce the gas temperature inside the superheater.

2. The boiler superheater control system according to claim 1, characterized in that, The detector is located at the inlet of the superheater, and the detector is not attached to the superheater.

3. The boiler superheater control system according to claim 1, characterized in that, The superheater is disposed inside the vent pipe and is used to process the gas after it has been processed by the soot blower.

4. The boiler superheater control system according to claim 3, characterized in that, An alarm is installed at the bottom of the superheater, which is used to trigger an alarm when the temperature of the superheater reaches a preset temperature.

5. The boiler superheater control system according to any one of claims 1 to 4, characterized in that, When the detection signal sent by the detector meets the preset conditions, the pressure regulating valve adjusts the gas pressure through the vent pipe.

6. The boiler superheater control system according to any one of claims 1 to 4, characterized in that, When the detection signal sent by the detector meets the preset conditions, the soot blowing steam generator performs a cyclic soot blowing operation.

7. The boiler superheater control system according to any one of claims 1 to 4, characterized in that, The detector and the soot blower are made of highly corrosion-resistant materials.

Images