An intelligent computing frequency of grate furnace combustion control system

Abstract

The present application belongs to the field of biomass combustion control, and particularly relates to a stoker combustion control system with intelligent frequency calculation, which comprises the following technical scheme: a stoker combustion control system with intelligent frequency calculation, which is used for being connected with a boiler PLC control system and comprises the following: a reciprocating stoker, a movable stoker control module, a combustion furnace temperature control module and a primary air control module; the reciprocating stoker is used for intelligently calculating and frequency-controlling the stop time of the hydraulic drive oil cylinder of each movable stoker through the movable stoker control module; the present application has the following advantages: the combustion control of the stoker is a non-sequential mode control based on intelligent frequency calculation, the reciprocating movement of each movable stoker is independently calculated to stop time, the combustion effect of the combustion partition under different working conditions can be optimized, and the intelligent control of the combustion temperature and the boiler output power is realized.

Description

Technical Field

[0001] This invention belongs to the field of biomass combustion control, and particularly relates to a grate furnace combustion control system with intelligent frequency calculation. Background Technology

[0002] Biomass power generation technology is one of the most common and effective methods of biomass energy application. In developed countries such as Europe and the United States, biomass power generation has become a very mature industry and an important method of power generation and heating in some countries. Due to the high water content of biomass fuel, reciprocating grate furnaces are typically used to achieve better combustion. In existing technologies, the combustion control system of the grate is basically sequential control, often involving manual adjustment of the movement frequency according to different operating conditions. This control method cannot adequately meet the characteristics of biomass combustion, achieve good combustion results, or realize highly intelligent control. To improve the efficiency of biomass combustion, fully utilize the advantages of grate furnaces, and enhance the intelligence of biomass combustion control, further research and development of existing technologies is needed. Summary of the Invention

[0003] One of the objectives of this invention is to address the problem that traditional combustion control systems for grate furnaces in the background art cannot achieve a high degree of intelligence, and to provide a control method for intelligent calculation frequency of reciprocating grate furnaces.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an intelligent frequency calculation grate furnace combustion control system for connecting with a boiler PLC control system, the intelligent frequency calculation grate furnace combustion control system comprising: a reciprocating grate furnace, a movable grate control module, a combustion furnace temperature control module, and a primary air control module.

[0005] The reciprocating grate furnace adopts a multi-stage movable grate design, with each stage of the movable grate equipped with an independent hydraulic drive cylinder. The reciprocating grate furnace is characterized by intelligently calculating and controlling the frequency of the pause time of the hydraulic drive cylinder of each stage of the movable grate through a movable grate control module.

[0006] The active grate control module includes two output modes: a holding mode for constant temperature control and a heating mode for heating control.

[0007] Furthermore, in the holding mode, the pause time of the hydraulic drive cylinder of the multi-stage moving grate is a fixed value; in the heating mode, the pause time of the hydraulic drive cylinder of the moving grate is intelligently calculated based on the actual values ​​of the combustion temperature and the primary air fan speed, thus obtaining the reciprocating frequency of the moving grate in the heating mode.

[0008] Furthermore, in the heating mode, the reciprocating frequency of the multi-stage movable grate is calculated based on the duty cycle. Since the hydraulic drive cylinder of the movable grate operates for a fixed time, the reciprocating frequency of the multi-stage movable grate is calculated based on its downtime.

[0009] Furthermore, the calculation of the interruption time requires establishing a correlation mathematical model for the parameters of the active grate control module, the combustion furnace temperature control module, and the primary air control module. Through mathematical model analysis and prediction, intelligent frequency control is calculated. The specific intelligent frequency calculation process is as follows:

[0010] 1) Calculate the furnace temperature coefficient: Using the letters Ts1 to represent the furnace temperature setpoint, Ts2 to represent the lower offset of the furnace temperature setpoint, T to represent the actual furnace temperature, y to represent the furnace temperature coefficient, ymin to represent the lower limit of the furnace temperature coefficient, and ymax to represent the upper limit of the furnace temperature coefficient, the linear formula is as follows: (T-Ts2) / (Ts1-Ts2)=(y-ymin) / (ymax-ymin), and the furnace temperature coefficient is derived as: y=((T-Ts2)*(ymax-ymin)) / (Ts1-Ts2)+ymin;

[0011] 2) Calculate the pause time: Using the letters Pt to represent the pause time, Ptmax to represent the upper limit of the set pause time, Ptmin to represent the lower limit of the set pause time, PLV to represent the primary air fan speed, PLVmax to represent the upper limit of the set primary air fan speed, and PLVmin to represent the lower limit of the set primary air fan speed, the formula is as follows: (PLV-PLVmin) / (PLVmax-PLVmin)=(Pt-Ptmin*y) / (Ptmax-Ptmin*y). The pause time of the moving grate in heating mode is then derived as follows:

[0012] Pt=((PLV-PLVmin) (Ptmax- Ptmin*y)) / (PLVmax-PLVmin)+ Ptmin*y.

[0013] Furthermore, the moving grate control of the reciprocating grate furnace is a non-sequential control based on intelligent frequency calculation.

[0014] Furthermore, the intelligent frequency calculation grate furnace combustion control system, through connection with the boiler PLC control system, realizes intelligent control of combustion temperature and output power.

[0015] The advantages of this invention are: the combustion control of the grate furnace is a non-sequential mode control based on intelligent calculation frequency, and the reciprocating motion of each active grate is independently calculated for the stop time, which can optimize the combustion effect of the combustion zone under different operating conditions, and at the same time realize intelligent control of combustion temperature and boiler output power. Attached Figure Description

[0016] Appendix Figure 1 The modular architecture of a grate furnace combustion control system with intelligent frequency calculation is shown in Example 1.

[0017] Appendix Figure 2 This is a timing diagram of a grate furnace combustion control system with intelligent frequency calculation, as shown in Example 1. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] In the description of this invention, unless otherwise stated, directional terms such as "upper," "lower," "inner," and "outer" in the terminology represent only the orientation of the term in its normal use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0020] In the description of this invention, in its different embodiments, different technical features and solutions, the technical features and solutions can be used in combination without conflict.

[0021] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion.

[0022] Example 1: As shown in the attached document Figure 1-2 As shown, an intelligent frequency calculation grate furnace combustion control system is used to connect with a boiler PLC control system. The intelligent frequency calculation grate furnace combustion control system includes: a reciprocating grate furnace 1, a movable grate control module 2, a combustion furnace temperature control module 3, and a primary air control module 4.

[0023] The reciprocating grate furnace 1 adopts a multi-stage movable grate 10 design, with each stage of movable grate 10 equipped with an independent hydraulic drive cylinder 11. The reciprocating grate furnace 1 is characterized by intelligently calculating and controlling the frequency of the stop time of the hydraulic drive cylinder 11 of each stage of movable grate through the movable grate control module 2.

[0024] The active grate control module 2 includes two output modes: a holding mode 21 for constant temperature control and a heating mode 22 for heating control.

[0025] Furthermore, in the holding mode 21, the intermediate stop time of the hydraulic drive cylinder 11 of the multi-stage movable grate 10 is a fixed value; in the heating mode 22, the intermediate stop time of the hydraulic drive cylinder 11 of the multi-stage movable grate 10 is intelligently calculated based on the actual values ​​of the combustion temperature and the primary air fan speed, so as to obtain the reciprocating frequency of the movable grate in the heating mode 22.

[0026] Furthermore, in the heating mode 22, the reciprocating frequency of the multi-stage movable grate 10 is calculated based on the duty cycle. Since the action time of the hydraulic drive cylinder 11 of the movable grate 10 is a fixed value, the reciprocating frequency of the multi-stage movable grate 10 is calculated based on its stop time.

[0027] Furthermore, the calculation of the interruption time requires establishing a correlation mathematical model for the parameters of the active grate control module 2, the combustion furnace temperature control module 3, and the primary air control module 4. Through mathematical model analysis and prediction, intelligent frequency control is calculated. The specific intelligent frequency calculation process is as follows:

[0028] 1) Calculate the furnace temperature coefficient: Using the letters Ts1 to represent the furnace temperature setpoint, Ts2 to represent the lower offset of the furnace temperature setpoint, T to represent the actual furnace temperature, y to represent the furnace temperature coefficient, ymin to represent the lower limit of the furnace temperature coefficient, and ymax to represent the upper limit of the furnace temperature coefficient, the linear formula is as follows: (T-Ts2) / (Ts1-Ts2)=(y-ymin) / (ymax-ymin), and the furnace temperature coefficient is derived as: y=((T-Ts2)*(ymax-ymin)) / (Ts1-Ts2)+ymin;

[0029] 2) Calculate the pause time: Using the letters Pt to represent the pause time, Ptmax to represent the upper limit of the set pause time, Ptmin to represent the lower limit of the set pause time, PLV to represent the primary air fan speed, PLVmax to represent the upper limit of the set primary air fan speed, and PLVmin to represent the lower limit of the set primary air fan speed, the formula is as follows: (PLV-PLVmin) / (PLVmax-PLVmin)=(Pt-Ptmin*y) / (Ptmax-Ptmin*y). The pause time of the moving grate in heating mode is then derived as follows:

[0030] Pt=((PLV-PLVmin) (Ptmax- Ptmin*y)) / (PLVmax-PLVmin)+ Ptmin*y.

[0031] Furthermore, the control of the moving grate 10 of the reciprocating grate furnace 1 is a non-sequential control based on intelligent frequency calculation.

[0032] Furthermore, the intelligent frequency calculation grate furnace combustion control system, through connection with the boiler PLC control system, realizes intelligent control of combustion temperature and output power.

[0033] Of course, the above are only preferred embodiments of the present invention and are not intended to limit the scope of application of the present invention. Therefore, any equivalent changes made to the principle of the present invention should be included within the scope of protection of the invention.

Claims

1. A grate furnace combustion control system with intelligent frequency calculation, for connection to a boiler PLC control system, the grate furnace combustion control system comprising: Reciprocating grate furnace, movable grate control module, combustion furnace temperature control module, primary air control module; The reciprocating grate furnace adopts a multi-stage movable grate design, with each stage equipped with an independent hydraulic drive cylinder. Its key feature is that the reciprocating grate furnace uses a movable grate control module to intelligently calculate and control the dwell time of the hydraulic drive cylinders for each stage of the movable grate. The movable grate control module includes two output modes: a holding mode for constant temperature control and a heating mode for heating control. In the holding mode, the dwell time of the hydraulic drive cylinders for the multi-stage movable grate is a fixed value. In the heating mode, the dwell time of the hydraulic drive cylinders for the movable grate is intelligently calculated based on the actual values ​​of the combustion temperature and the primary air fan speed to determine the reciprocating frequency of the movable grate in the heating mode. The intelligent calculation process for the dwell time is as follows: 1) Calculate the furnace temperature coefficient: Using the letters Ts1 to represent the furnace temperature setpoint, Ts2 to represent the lower offset of the furnace temperature setpoint, T to represent the actual furnace temperature, y to represent the furnace temperature coefficient, ymin to represent the lower limit of the furnace temperature coefficient, and ymax to represent the upper limit of the furnace temperature coefficient, the linear formula is as follows: (T-Ts2) / (Ts1-Ts2)=(y-ymin) / (ymax-ymin), and the furnace temperature coefficient is derived as: y=((T-Ts2)*(ymax-ymin)) / (Ts1-Ts2)+ymin; 2) Calculate the pause time: Using the letters Pt to represent the pause time, Ptmax to represent the upper limit of the set pause time, Ptmin to represent the lower limit of the set pause time, PLV to represent the primary air fan speed, PLVmax to represent the upper limit of the set primary air fan speed, and PLVmin to represent the lower limit of the set primary air fan speed, the formula is as follows: (PLV-PLVmin) / (PLVmax-PLVmin)=(Pt-Ptmin*y) / (Ptmax-Ptmin*y). The pause time of the moving grate in heating mode is then derived as follows: Pt=((PLV-PLVmin)(Ptmax-Ptmin*y)) / (PLVmax-PLVmin)+Ptmin*y.

2. The intelligent frequency calculation grate furnace combustion control system as described in claim 1, characterized in that: In heating mode, the reciprocating frequency of the multi-stage moving grate is calculated based on the duty cycle, and the reciprocating frequency of the multi-stage moving grate is calculated based on its stop time.

3. The intelligent frequency calculation grate furnace combustion control system as described in claim 1, characterized in that: The moving grate control of the reciprocating grate furnace is a non-sequential control based on intelligent frequency calculation.

4. A grate furnace combustion control system with intelligent frequency calculation as described in any one of claims 1-3, characterized in that: The intelligent frequency calculation grate furnace combustion control system achieves intelligent control of combustion temperature and output power through connection with the boiler PLC control system.

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