Air and smoke integrated control system and method based on different DCS systems

Abstract

The invention relates to the technical field of DCS systems, and provides an air and smoke integrated control system and method based on different DCS systems, the air and smoke integrated control system comprises an induced draft fan and a booster fan, the system realizes data communication between a desulfurization DCS and a host DCS system through a communication technology, logic operation is performed in the host DCS system, and related equipment is controlled. By means of the technical scheme, the problems that in the prior art, a boiler is insufficient in combustion, cokes and is large in power consumption are solved.

Description

Technical Field

[0001] The present invention relates to the field of DCS control technology, and in particular to an integrated air and smoke control system and method based on different DCS systems. Background Art

[0002] The 1000MW ultra-supercritical coal-fired unit was originally equipped with two axial flow induced draft fans with stator blade adjustment and two axial flow booster fans with stator blade adjustment. The main problems currently exist are as follows:

[0003] The boiler negative pressure control is mainly carried out by the static blades of the induced draft fan. The motor power of the induced draft fan is large, so the power consumption of the factory is too high.

[0004] Large fluctuations in boiler negative pressure control can easily affect combustion conditions, leading to incomplete boiler combustion, coking, etc.

[0005] The inspection, monitoring and control of the induced draft fan and the booster fan are completed by different DCS systems respectively, which does not meet the requirements of joint regulation. Summary of the invention

[0006] The present invention proposes an integrated air and smoke control system and method based on different DCS systems, which solves the problems of insufficient boiler combustion, coking and high power consumption in the related art.

[0007] The technical solution of the present invention is as follows:

[0008] An integrated air and smoke control system and method based on different DCS systems includes an induced draft fan and a booster fan. The system realizes data communication between the desulfurization DCS and the host DCS system through communication technology, performs logical operations in the host DCS system and controls related equipment.

[0009] Optionally, logical configuration of the induced draft fan and booster fan stator blades is performed in the host DCS and unified control is achieved.

[0010] Optionally, the induced draft fan and the booster fan stator blades can jointly adjust the furnace pressure and the booster fan inlet flue gas pressure.

[0011] A control method using any one of the systems described above, characterized in that it comprises the following steps:

[0012] S1. Use communication technology to achieve data communication between desulfurization DCS and host DCS system;

[0013] S2, perform logical operations in the host DCS system;

[0014] S3. Control the static blades of the induced draft fan and the booster fan to jointly adjust the furnace pressure and the booster fan inlet flue gas pressure.

[0015] Optionally, the principle of the booster fan being the main regulator and the induced draft fan being the secondary regulator is adopted.

[0016] A control algorithm in the wind and smoke system integrated control system as described above, the algorithm comprises the following steps:

[0017] A1. Receive real-time data from the desulfurization DCS system;

[0018] A2. Preprocess and analyze the received data in the host DCS system;

[0019] A3. Calculate the target values ​​of furnace pressure and booster fan inlet flue gas pressure based on the preprocessed data;

[0020] A4. Determine the optimal opening of the stator blades of the induced draft fan and the booster fan by using an optimization algorithm, such as linear programming or dynamic programming;

[0021] A5. Send the calculated optimal opening value to the corresponding actuator to achieve precise adjustment of the stator blades of the induced draft fan and the booster fan.

[0022] Optionally, the target value in step C is calculated using the following formula: target =f(P current ,T boiler ,Q fuel ) Among them, P target is the target furnace pressure, P current is the current furnace pressure, T boiler is the boiler temperature, Q fuel is the calorific value of the fuel.

[0023] A method for implementing the control algorithm as described above comprises the following steps:

[0024] B1. Initialize algorithm parameters, including population size, crossover rate, mutation rate, etc.;

[0025] B2. Generate the initial population and calculate the fitness of each individual;

[0026] B1. Perform selection, crossover and mutation operations based on fitness to generate a new generation of population;

[0027] B3, repeat steps II and III until the stop condition is met or the predetermined number of iterations is reached;

[0028] B4. Select the optimal solution from the final population as the adjustment instruction for the stator blades of the induced draft fan and the booster fan.

[0029] Optionally, the fitness value in step S2 is calculated using the following formula:

[0030] Fitness=ω 1 ·(Ptarget -P current ) 2 +ω 2 ·(Q demand -Q supply ) 2 , where ω 1 and ω 2 is the weight coefficient, Q demand is the required flue gas volume, Q supply It is the amount of flue gas supplied.

[0031] The working principle and beneficial effects of the present invention are:

[0032] In the present invention, the induced draft fan adopts the combined integrated control of different DCS systems to reduce the number of large fluctuations of furnace negative pressure, alleviate the coking of the furnace, and greatly improve the combustion efficiency of the boiler. The principle of booster fan main regulation and induced draft fan auxiliary regulation is adopted to greatly reduce the factory electricity consumption. After the combined integrated control of the induced draft fan, it is completely inspected and monitored by the personnel of the centralized control operation branch, which simplifies the work positions in our factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0034] Figure 1 It is a schematic diagram of the prior art process;

[0035] Figure 2 It is a schematic diagram of the technical process of the present invention;

[0036] Figure 3 It is the process control diagram of the present invention;

[0037] Figure 4 This is the control logic diagram of the fan after the first unified control of the present invention;

[0038] Figure 5 This is the second logic diagram of the fan control after unified control added in the present invention. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0040] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0041] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] Reference Figure 1 to Figure 5 , is an embodiment of the present invention, and proposes

[0044] An integrated air and smoke control system and method based on different DCS systems includes an induced draft fan and a booster fan. The system realizes data communication between the desulfurization DCS and the host DCS system through communication technology, performs logical operations in the host DCS system and controls related equipment.

[0045] Optionally, logical configuration of the induced draft fan and booster fan stator blades is performed in the host DCS and unified control is achieved.

[0046] Optionally, the induced draft fan and the booster fan stator blades can jointly adjust the furnace pressure and the booster fan inlet flue gas pressure.

[0047] A control method using any one of the systems described above, characterized in that it comprises the following steps:

[0048] S1. Use communication technology to achieve data communication between desulfurization DCS and host DCS system;

[0049] S2, perform logical operations in the host DCS system;

[0050] S3. Control the static blades of the induced draft fan and the booster fan to jointly adjust the furnace pressure and the booster fan inlet flue gas pressure.

[0051] Optionally, the principle of the booster fan being the main regulator and the induced draft fan being the secondary regulator is adopted.

[0052] A control algorithm in the wind and smoke system integrated control system as described above, the algorithm comprises the following steps:

[0053] A1. Receive real-time data from the desulfurization DCS system;

[0054] A2. Preprocess and analyze the received data in the host DCS system;

[0055] A3. Calculate the target values ​​of furnace pressure and booster fan inlet flue gas pressure based on the preprocessed data;

[0056] A4. Determine the optimal opening of the stator blades of the induced draft fan and the booster fan by using an optimization algorithm, such as linear programming or dynamic programming;

[0057] A5. Send the calculated optimal opening value to the corresponding actuator to achieve precise adjustment of the stator blades of the induced draft fan and the booster fan.

[0058] Optionally, the target value in step C is calculated using the following formula: target =f(P current ,T boiler ,Q fuel ) Among them, P target is the target furnace pressure, P current is the current furnace pressure, T boiler is the boiler temperature, Q fuel is the calorific value of the fuel.

[0059] A method for implementing the control algorithm as described above comprises the following steps:

[0060] B1. Initialize algorithm parameters, including population size, crossover rate, mutation rate, etc.;

[0061] B2. Generate the initial population and calculate the fitness of each individual;

[0062] B1. Perform selection, crossover and mutation operations based on fitness to generate a new generation of population;

[0063] B3, repeat steps II and III until the stop condition is met or the predetermined number of iterations is reached;

[0064] B4. Select the optimal solution from the final population as the adjustment instruction for the stator blades of the induced draft fan and the booster fan.

[0065] Optionally, the fitness value in step S2 is calculated using the following formula:

[0066] Fitness=ω 1 ·(P target -P current )2 +ω 2 ·(Q demand -Q supply ) 2 , where ω 1 and ω 2 is the weight coefficient, Q demand is the required flue gas volume, Q supply It is the amount of flue gas supplied.

[0067] In the present invention, communication technology is used to realize the communication between the desulfurization DCS and the host DCS system, the relevant data of the desulfurization system is communicated to the host DCS system, logical operations are performed in the host DCS system, and related equipment is controlled.

[0068] The suction fan stator blades and booster fan stator blades are logically configured and uniformly controlled in the host DCS to avoid the opposite regulating effects of the suction fan and booster fan stator blades on each other, and to achieve the ability of the booster fan and induced draft fan stator blades to jointly regulate the furnace pressure and the booster fan inlet flue gas pressure.

[0069] The combined integrated control of the induced draft fans in different DCS systems reduces the number of large fluctuations in furnace negative pressure, alleviates furnace coking, and greatly improves the combustion efficiency of the boiler. The principle of booster fan as the main regulator and induced draft fan as the auxiliary regulator greatly reduces the factory's electricity consumption. After the combined integrated control of the induced draft fans, the centralized control and operation branch personnel conduct inspections and monitoring, which streamlines the work positions in our factory.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An integrated air and smoke control system based on different DCS systems, including an induced draft fan and a booster fan, characterized in that: The system realizes data communication between the desulfurization DCS and the host DCS system through communication technology, performs logical operations in the host DCS system and controls related equipment.

2. The system according to claim 1, characterized in that The stator blades of the induced draft fan and booster fan are logically configured and uniformly controlled in the host DCS.

3. The system according to claim 1 or 2, characterized in that: The induced draft fan and the booster fan stator blades can jointly adjust the furnace pressure and the booster fan inlet flue gas pressure regulation capabilities.

4. A control method using the system according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Use communication technology to achieve data communication between desulfurization DCS and host DCS system; S2, perform logical operations in the host DCS system; S3. Control the static blades of the induced draft fan and the booster fan to jointly adjust the furnace pressure and the booster fan inlet flue gas pressure.

5. The method according to claim 4, characterized in that The principle of the booster fan being the main regulator and the induced draft fan being the secondary regulator is adopted.

6. A control algorithm in the integrated control system of the wind and smoke system as claimed in claims 1 to 5, characterized in that: The algorithm consists of the following steps: A1. Receive real-time data from the desulfurization DCS system; A2. Preprocess and analyze the received data in the host DCS system; A3. Calculate the target values ​​of furnace pressure and booster fan inlet flue gas pressure based on the preprocessed data; A4. Determine the optimal opening of the stator blades of the induced draft fan and the booster fan by using an optimization algorithm, such as linear programming or dynamic programming; A5. Send the calculated optimal opening value to the corresponding actuator to achieve precise adjustment of the stator blades of the induced draft fan and the booster fan.

7. The control algorithm according to claim 6, characterized in that: The target value in step C is calculated using the following formula: target =f(P current ,T boiler ,Q fuel ) Among them, P target is the target furnace pressure, P current is the current furnace pressure, T boiler is the boiler temperature, Q fuel is the calorific value of the fuel.

8. A method for implementing the control algorithm as claimed in claims 6 and 7, characterized in that: The following steps are involved: B1. Initialize algorithm parameters, including population size, crossover rate, mutation rate, etc.; B2. Generate the initial population and calculate the fitness of each individual; B1. Perform selection, crossover and mutation operations based on fitness to generate a new generation of population; B3, repeat steps II and III until the stop condition is met or the predetermined number of iterations is reached; B4. Select the optimal solution from the final population as the adjustment instruction for the stator blades of the induced draft fan and the booster fan.

9. The implementation method according to claim 8, characterized in that: The fitness value in step S2 is calculated using the following formula: Fitness=ω1·(P target -P current ) 2 +ω2·(Q demand -Q supply ) 2 , where ω1 and ω2 are weight coefficients, Q demand is the required flue gas volume, Q supply It is the amount of flue gas supplied.

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