Flue gas desulfurization and denitrification fan energy-saving control system

Abstract

The utility model discloses a flue gas desulfurization and denitrification fan energy-saving control system, which is arranged in a flue gas desulfurization and denitrification dust removal system and comprises a flow velocity sensor, a first pressure sensor and a pollutant concentration sensor which are arranged at an inlet of a desulfurization tower, and a second pressure sensor arranged at a chimney discharge port, the air door is arranged at an inlet of the induced draft fan, and the terminal is connected with the induced draft fan, the flow speed sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the air door. By means of the hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system, the induced draft fan can be adjusted according to the air volume required by the system and the resistance of the system, the adjustment of the induced draft fan can more accurately adapt to the actual working condition, unnecessary electric energy consumption is reduced, and the purposes of energy saving and optimization are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan control, in particular to a flue gas desulfurization and denitrification fan energy-saving control system. BACKGROUND

[0002] In flue gas treatment, the fan is a power device that overcomes the resistance of flue gas treatment equipment to maintain the flow of flue gas, converts electrical energy into mechanical energy, and is a driven fluid machine. With the increase in the number of flue gas emission indicators and the gradual decrease in the indicators, the number of devices in series in the flue gas treatment process increases, the resistance of the entire system increases, the power of the fan motor increases, and the power consumption increases. Therefore, the energy consumption cost of the fan accounts for a considerable proportion of the environmental protection expenditure cost in each industry. According to incomplete statistics, the cost of electricity accounts for 10% of the production cost of a steel enterprise, and the electricity cost of the fan accounts for about 70% of the cost of electricity. Optimizing the control mode of the fan is particularly important for energy efficiency management of the fan, which not only meets the state's energy-saving and carbon-reducing mandatory indicators, but also reduces the cost of enterprises.

[0003] At present, most fans are equipped with adjustable devices, such as centrifugal fans equipped with an alternating current frequency conversion speed regulation device and a fluid coupling device to control the speed of the fan, an axial flow fan with adjustable static blades equipped with an alternating current frequency conversion speed regulation device, and an axial flow fan with adjustable dynamic blades with adjustment function.

[0004] However, the inventors have realized that in a desulfurization and denitrification system, the required air volume of the system and the resistance of the system (usually represented by the pressure difference, i.e. the pressure difference between the inlet and outlet of the system) determine the adjustment of the fan; and based on the existing hardware architecture of the desulfurization and denitrification system, for example, a desulfurization and denitrification system for sintering flue gas disclosed in Chinese patent document CN104006673A, which includes a mixing granulation device, a main exhaust pipe, an electric precipitator, a circular cooler, a bypass valve, an activated carbon absorption tower, a bag-type dust collector, an activated carbon storage bin, and a chimney; the main exhaust pipe of the sintering machine is connected to the activated carbon absorption tower through the electric precipitator, the bag-type dust collector is arranged at the rear of the activated carbon absorption tower, the bypass valve is arranged on the connecting pipe between the electric precipitator and the activated carbon absorption tower, and the bag-type dust collector and the bypass valve are both connected to the chimney; a heat recovery hood is arranged above the circular cooler, an induced draft fan is arranged at the rear of the heat recovery hood, the induced draft fan is connected to a hot air pipe, and the other end of the hot air pipe is connected to the pipe between the electric precipitator and the activated carbon absorption tower. It is not possible to adjust the induced draft fan according to the required air volume of the system and the resistance of the system, and the induced draft fan may be in a high-power operating state for a long time.

[0005] In actual operation, the air volume required by the system is not constant, and when the air volume requirement decreases, if the induced draft fan cannot adjust the speed or guide vane angle, etc., the output power will still be maintained at a high level, which will lead to a large amount of waste of electric energy. For example, in some working conditions, at night or in the slack season, the flue gas production is reduced, and the air volume required by the system is reduced, but the induced draft fan still runs at full capacity due to the inability to adjust, resulting in unnecessary power consumption continuing to occur, increasing the electricity expenditure of the enterprise, and going against the goal of energy saving and carbon reduction. Practical new type content

[0006] Therefore, the present application provides a flue gas desulfurization and denitrification fan energy-saving control system, which aims to provide hardware contribution for adjusting the induced draft fan according to the air volume required by the system and the resistance of the system.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A flue gas desulfurization and denitrification fan energy-saving control system is arranged in a flue gas desulfurization and denitrification dust removal system, wherein the flue gas desulfurization and denitrification dust removal system comprises, in sequence, an upstream flue gas generating device, a flue gas conveying device, a desulfurization tower, a flue gas condenser, a wet-type electric dust collector, a flue gas defogging device, an SCR reactor, an induced draft fan and a chimney; and the flue gas desulfurization and denitrification fan energy-saving control system comprises:

[0009] A flow rate sensor is arranged at the inlet of the desulfurization tower and used to collect the flue gas flow rate of the inlet of the desulfurization tower in real time;

[0010] A first pressure sensor is arranged at the inlet of the desulfurization tower and used to collect the pressure of the inlet of the desulfurization tower in real time;

[0011] A second pressure sensor is arranged at the discharge port of the chimney and used to collect the pressure of the discharge port of the chimney in real time;

[0012] A pollutant concentration sensor is arranged at the inlet of the desulfurization tower and used to collect the pollutant content of the inlet of the desulfurization tower in real time;

[0013] A damper is arranged at the inlet of the induced draft fan;

[0014] A terminal is connected with the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the damper.

[0015] Optionally, the pollutant concentration sensor comprises a sulfur dioxide sensor, a nitrogen oxide sensor and a particulate matter sensor.

[0016] Optionally, the induced draft fan is a centrifugal fan or an axial flow fan.

[0017] Optionally, the terminal comprises a processor, a communication module and a human-computer interaction component, the communication module and the human-computer interaction component are connected with the processor, and the communication module is configured to establish a communication connection with the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the damper.

[0018] Further optionally, the terminal further comprises an alarm module, and the alarm module is connected with the processor.

[0019] Further optionally, the alarm module is an audible and visual alarm.

[0020] Compared with the prior art, the application has at least the following beneficial effects:

[0021] The embodiment of the application provides a new hardware architecture of a flue gas desulfurization and denitrification induced draft fan energy-saving control system. The flow rate sensor, the first pressure sensor and the pollutant concentration sensor are arranged at the inlet of the desulfurization tower of the flue gas desulfurization and denitrification dust removal system, the second pressure sensor is arranged at the chimney discharge port, the damper is arranged at the inlet of the induced draft fan, and the terminal is connected with the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the damper. In the process of desulfurization and denitrification, the terminal can monitor multiple values such as the flue gas flow at the inlet of the desulfurization and denitrification dust removal system, the system inlet pressure, the environmental protection discharge port pressure at the system outlet, the pollutant concentration at the system inlet and the real-time operation parameters of the induced draft fan, so that when the staff wants to adjust the induced draft fan speed and the induced draft fan inlet damper opening, the air volume required by the system (reflected by the flue gas flow monitored by the flow rate sensor), the system resistance (reflected by the difference between the system inlet pressure and the outlet environmental protection discharge port pressure) and the pollutant concentration at the system inlet can be considered comprehensively, and the operation parameters of the induced draft fan, especially the fan efficiency, can also be considered, so that the induced draft fan speed and the induced draft fan inlet damper opening suitable for the current desulfurization and denitrification working environment are obtained, and the updated induced draft fan speed and induced draft fan inlet damper opening are sent to the induced draft fan and the damper through the terminal to realize the adjustment of the induced draft fan. The embodiment of the application provides hardware support and contribution for adjusting the induced draft fan according to the air volume required by the system and the system resistance. The hardware architecture of the flue gas desulfurization and denitrification induced draft fan energy-saving control system provided by the embodiment of the application can obtain comprehensive and real-time data support, can make the adjustment of the induced draft fan more accurately adapt to the actual working condition, can avoid the overwork or inefficient operation of the induced draft fan while ensuring that the desulfurization and denitrification effect meets the environmental protection requirements, and can further reduce unnecessary power consumption, so that the purpose of energy saving and optimization is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes, structures shown in the drawings should not be considered as limiting conditions in the implementation of the present application; for example, based on the technical concepts disclosed in the present application and the exemplary drawings, those skilled in the art can easily make routine adjustments or further optimizations to the increase / decrease / assignment of certain units (components), specific shapes, positional relationships, connection methods, size ratio relationships, etc.

[0023] Figure 1 A setting scene schematic diagram of a flue gas desulfurization and denitrification fan energy-saving control system provided for an embodiment of the present application;

[0024] Figure 2 A connection relationship schematic diagram of a flue gas desulfurization and denitrification fan energy-saving control system provided for an embodiment of the present application;

[0025] Figure 3 A component module schematic diagram of a terminal in an embodiment of the present application.

[0026] Legend of reference signs:

[0027] 1, flue gas generating device; 2, flue gas conveying device; 3, desulfurization tower; 4, flue gas condenser; 5, wet-type electric dust collector; 6, flue de-mister; 7, SCR reactor; 8, induced draft fan; 9, chimney; 10, flow rate sensor; 11, first pressure sensor; 12, second pressure sensor; 13, pollutant concentration sensor; 131, sulfur dioxide sensor; 132, nitrogen oxide sensor; 133, particulate matter sensor; 14, damper; 15, terminal; 151, processor; 152, communication module; 153, human-computer interaction component. DETAILED DESCRIPTION

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] In the description of the present application: unless otherwise specified, the meaning of "multiple" is two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects referred to, and do not have a special meaning in the technical connotation aspect (for example, it should not be understood as an emphasis on importance or order, etc.). The expressions "include", "contain", "have" and the like also mean "not limited to" (certain units, components, materials, steps, etc.).

[0030] The terms such as "upper", "lower", "left", "right", "middle" and the like referred to in the present application are generally indications of the relative positional relationship for the purpose of intuitive understanding with reference to the drawings, and are not absolute limitations on the positional relationship in the actual product.

[0031] In the embodiment of the present application, a flue gas desulfurization and denitrification fan energy-saving control system is provided, which is arranged in a flue gas desulfurization and denitrification dust removal system of a steel plant, as shown in the drawings. Figure 1 As shown in the drawings, the flue gas desulfurization and denitrification dust removal system comprises, in sequence, an upstream flue gas generating device 1, a flue gas conveying device 2, a desulfurization tower 3, a flue gas condenser 4, a wet-type electric dust collector 5, a flue dust remover 6, an SCR reactor 7, an induced draft fan 8 and a chimney 9; as shown in Figure 1 and Figure 2 , the flue gas desulfurization and denitrification fan energy-saving control system specifically comprises:

[0032] A flow rate sensor 10 is arranged at the inlet of the desulfurization tower 3 and used to collect the flue gas flow rate at the inlet of the desulfurization tower 3 in real time;

[0033] A first pressure sensor 11 is arranged at the inlet of the desulfurization tower 3 and used to collect the pressure at the inlet of the desulfurization tower 3 in real time;

[0034] A second pressure sensor 12 is arranged at the discharge port of the chimney 9 and used to collect the pressure at the discharge port of the chimney 9 in real time;

[0035] A pollutant concentration sensor 13 is arranged at the inlet of the desulfurization tower 3 and used to collect the pollutant content at the inlet of the desulfurization tower 3 in real time;

[0036] A damper 14 is arranged at the inlet of the induced draft fan 8;

[0037] A terminal 15 is connected with the induced draft fan 8, the flow rate sensor 10, the first pressure sensor 11, the second pressure sensor 12, the pollutant concentration sensor 13 and the damper 14.

[0038] The pollutant concentration sensor 13 specifically can comprise a sulfur dioxide sensor 131 and a nitrogen oxide sensor 132. Meanwhile, the pollutant concentration sensor 13 can further comprise a particulate matter sensor 133.

[0039] In the hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system provided in the embodiment of the present application, since the terminal 15 is connected with the induced draft fan 8 and the damper 14, before starting the flue gas desulfurization and denitrification work, the terminal 15 can send the initial induced draft fan rotating speed and the induced draft fan inlet damper opening degree to the induced draft fan 8 and the damper 14, so that the induced draft fan 8 and the damper 14 can start to work at the initial induced draft fan rotating speed and the induced draft fan inlet damper opening degree when performing the flue gas desulfurization and denitrification.

[0040] Based on the hardware architecture provided in the present application, and since the terminal 15 is also connected with the flow rate sensor 10, the first pressure sensor 11, the second pressure sensor 12, and the pollutant concentration sensor 13, after the operation of the induced draft fan 8, during the flue gas desulfurization and denitrification process, the flow rate sensor 10 can be used to monitor the flue gas flow rate at the inlet of the desulfurization and denitrification system in real time, the first pressure sensor 11 and the second pressure sensor 12 can be used to monitor the inlet pressure of the system and the environmental protection outlet pressure of the system in real time, and the pollutant concentration sensor 13 can be used to monitor the SO2 content, the NOx content, and the particulate matter content at the inlet of the system in real time, and all the obtained data can be transmitted to the terminal 15. x

[0041] In addition, since the terminal 15 is also connected with the induced draft fan 8, during the flue gas desulfurization and denitrification process, the terminal 15 can also obtain the real-time operation parameters of the induced draft fan 8 in real time, including but not limited to the fan and motor bearing temperature and vibration value, fan efficiency, frequency converter current and rotating speed, etc.

[0042] Therefore, when the staff wants to adjust the induced draft fan rotating speed and the induced draft fan inlet damper opening degree, the flue gas flow rate at the inlet of the desulfurization and denitrification system (reflecting the system demand air volume), the inlet pressure of the system and the environmental protection outlet pressure (reflecting the resistance of the system), the SO2 content, the NOx content, and the particulate matter content, etc. can be considered comprehensively, and the operation parameters of the induced draft fan can also be considered, so that the induced draft fan rotating speed and the induced draft fan inlet damper opening degree suitable for the current desulfurization and denitrification working environment can be obtained, and the updated induced draft fan rotating speed and induced draft fan inlet damper opening degree can be sent to the induced draft fan 8 and the damper 14 through the terminal 15, so as to realize the adjustment of the induced draft fan 8.

[0043] As an optional embodiment, the more suitable induced draft fan rotating speed and induced draft fan inlet damper opening degree can be the parameters that can meet the system demand air volume, keep the inlet pressure of the desulfurization and denitrification system and the environmental protection outlet pressure stable, and make the induced draft fan run in the lowest energy consumption interval. For example, keeping stable can mean maintaining the inlet pressure and the environmental protection outlet pressure in a preset interval range.

[0044] The induced draft fan can be a centrifugal fan or an axial flow fan, and when adjusting the rotating speed of the induced draft fan, the frequency of the induced draft fan can be adjusted, or the guide vane or the fluid coupling of the induced draft fan can be adjusted.

[0045] ​Specifically how to adjust the fan speed and the fan inlet damper opening degree according to the above factors does not belong to the content involved in the present application. As an optional way, the skilled in the art can use the preset setting values stored in the database to realize in actual implementation; of course, the skilled in the art can also select other conventional control means to realize according to the actual situation. The embodiment of the present application only provides a contribution on the hardware architecture for realizing the adjustment of the fan speed and the fan inlet damper opening degree according to the system required air volume and the system resistance in the flue gas desulfurization and denitrification system environment of the steel plant, so the present application does not involve the improvement on the method.

[0046] Further, as shown in Figure 3 , the terminal 15 specifically includes a processor 151, a communication module 152 and a human-computer interaction component 153, the communication module 152 and the human-computer interaction component 153 are connected with the processor 151, and the communication module 152 is used to establish a communication connection with the induced draft fan 8, the flow rate sensor 10, the first pressure sensor 11, the second pressure sensor 12, the pollutant concentration sensor 13 and the damper 14.

[0047] Among them, the communication module 152 can specifically include a plurality of input and output interfaces and a wireless communication module, and the communication module 152 can communicate with other components through wired connection through the input and output interface, or can communicate with other components wirelessly through the wireless communication module.

[0048] From another point of view, the terminal 15 can contain components such as motherboard, CPU, memory, display, input device, input and output interface and expansion module. The input and output interface can realize communication with external devices such as DCS (PLC), sensor, actuator, gateway device, etc.

[0049] The staff can set the speed of the induced draft fan 8 and the damper 14 and the fan inlet damper opening degree through the human-computer interaction component 153, and can view the values collected by each sensor, and can view the fan running parameters.

[0050] Further, as shown in Figure 3 , the terminal 15 can also include an alarm module 154, and the alarm module 154 is connected with the processor 151.

[0051] Among them, the alarm module 154 can be specifically an audible and visual alarm.

[0052] By setting the alarm module 154, when the data received by the terminal 15 is abnormal, the processor 151 can send a control signal to the alarm module 154 to make the alarm module 154 alarm and notify the staff to handle.

[0053] In summary, the embodiment of the present application provides a new hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system, by increasing the flow rate sensor, the first pressure sensor and the pollutant concentration sensor at the inlet of the desulfurization tower of the flue gas desulfurization and denitrification dust removal system, increasing the second pressure sensor at the chimney discharge port, increasing the air door at the inlet of the induced draft fan, and establishing a connection between the terminal and the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the air door, so that during the desulfurization and denitrification process, the terminal can monitor multiple values such as the flue gas flow at the inlet of the desulfurization and denitrification dust removal system, the system inlet pressure, the environmental protection discharge port pressure at the system outlet, the pollutant concentration at the system inlet, and the real-time operation parameters of the induced draft fan, so that when the staff wants to adjust the induced draft fan speed and the induced draft fan inlet air door opening, the system required air volume (reflected by the flue gas flow monitored by the flow rate sensor), the system resistance (reflected by the difference between the system inlet pressure and the outlet environmental protection discharge port pressure) and the system inlet pollutant concentration can be considered comprehensively, and the induced draft fan operation parameters, especially the fan efficiency, are also considered to obtain the induced draft fan speed and the induced draft fan inlet air door opening that are more suitable for the current desulfurization and denitrification working environment, and the updated induced draft fan speed and induced draft fan inlet air door opening are sent to the induced draft fan and the air door through the terminal to realize the adjustment of the induced draft fan.

[0054] The embodiment of the present application provides hardware support and contribution for adjusting the induced draft fan according to the system required air volume and the system resistance, and by using the hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system provided by the embodiment of the present application, comprehensive and real-time data support can be obtained, the adjustment of the induced draft fan can be more accurately adapted to the actual working condition, the overwork or inefficient operation of the induced draft fan can be avoided while ensuring that the desulfurization and denitrification effect meets the environmental protection requirements, thereby reducing unnecessary power consumption and achieving the purpose of energy saving optimization.

[0055] For example, when the system required air volume decreases, the system resistance changes or the pollutant concentration decreases, the terminal can correspondingly reduce the induced draft fan speed and adjust the air door opening to match the power output of the induced draft fan with the actual demand, so as to avoid the induced draft fan still in unnecessary high-power operation mode under low demand state, thereby reducing power consumption, effectively saving energy and achieving energy saving effect.

[0056] The new hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system provided by the embodiment of the present application provides hardware contribution for giving the optimal adjustment scheme of the induced draft fan under the premise of ensuring that the environmental emission standard is met and the operation parameters of the induced draft fan are in a suitable range when the induced draft fan is adjusted. In this way, the operation of the induced draft fan is more in line with the current desulfurization and denitrification working condition, and the situation of low fan operation efficiency or energy waste is avoided.

[0057] The hardware architecture of the flue gas desulfurization and denitrification fan energy-saving control system provided by the embodiments of the present application can be applied to two cases: manual control and automatic control. For manual control, since various signals are collected, the staff can consider various factors to make more objective and accurate analysis and judgment for manual control. For automatic control, the conventional control idea and logic can be followed.

[0058] The technical features of the above embodiments can be combined in any manner (as long as the combination of the technical features does not exist contradiction). In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. The embodiments not explicitly written should also be considered as the scope of the present disclosure.

Claims

1. A flue gas desulfurization and denitrification fan energy-saving control system, characterized in that, The application discloses a flue gas desulfurization and denitrification fan energy-saving control system which is arranged in a flue gas desulfurization and denitrification dust removal system. A flow rate sensor is arranged at the inlet of the desulfurization tower and used for collecting the flue gas flow rate of the inlet of the desulfurization tower in real time. A first pressure sensor is arranged at the inlet of the desulfurization tower and used for collecting the pressure of the inlet of the desulfurization tower in real time. A second pressure sensor is arranged at the discharge port of the chimney and used for collecting the pressure of the discharge port of the chimney in real time. A pollutant concentration sensor is arranged at the inlet of the desulfurization tower and used for collecting the pollutant content of the inlet of the desulfurization tower in real time. A damper is arranged at the inlet of the induced draft fan. A terminal is connected with the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the damper.

2. The flue gas desulfurization and denitrification fan energy-saving control system according to claim 1, characterized in that, The pollutant concentration sensor comprises a sulfur dioxide sensor, a nitrogen oxide sensor and a particulate matter sensor.

3. The energy saving control system for the flue gas desulfurization and denitrification fan according to claim 1, characterized in that, The induced draft fan is a centrifugal fan or an axial flow fan.

4. The flue gas desulfurization and denitrification fan energy-saving control system according to claim 1, characterized in that, The terminal comprises a processor, a communication module and a human-computer interaction component, the communication module and the human-computer interaction component are connected with the processor, and the communication module is used for establishing a communication connection with the induced draft fan, the flow rate sensor, the first pressure sensor, the second pressure sensor, the pollutant concentration sensor and the damper.

5. The energy saving control system for the flue gas desulfurization and denitrification fan according to claim 4, characterized in that, The terminal further comprises an alarm module which is connected with the processor.

6. The flue gas desulfurization and denitrification fan energy-saving control system according to claim 5, characterized in that, The alarm module is an audible and visual alarm.

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