Reverse pushing grate furnace feeding control system and control method

Abstract

The invention discloses a reverse pushing grate furnace feeding control system and method.The reverse pushing grate furnace comprises a boiler, a feeding grate and an incineration grate, the control system comprises a hearth temperature mode control unit, and the hearth temperature mode control unit comprises a temperature measuring instrument set and a hearth temperature controller; the temperature measuring instrument group is used for collecting the temperature of a corresponding measuring point at the top of a first flue of the boiler; the hearth temperature controller is connected with the output end of the temperature measuring instrument group, the hearth temperature controller is connected with the feeding fire grate and the incineration fire grate, and the hearth temperature controller is used for calculating an average temperature value according to the temperature fed back by the temperature measuring instrument group; and the control module is used for controlling the feeding speed of the feeding fire grate and / or the fire grate sliding speed of the incineration fire grate according to the difference value between the average temperature value and the temperature given value. The reverse pushing grate furnace can well conduct waste incineration treatment, and the waste incineration control effect and efficiency are improved.

Description

Technical Field

[0001] The invention relates to a reverse grate furnace feeding control system and a control method, belonging to the technical field of reverse grate furnace control. Background Art

[0002] At present, waste incineration power generation is an effective way to dispose of waste harmlessly, reduce its volume and recycle it into resources. Waste incineration can not only achieve environmental protection effects, but also the waste heat from waste incineration can generate steam for power generation and heating, saving energy, and is a good way to recycle resources. The reverse grate furnace is a key equipment for waste incineration treatment, among which the control of the feeding system is the core part of the reverse grate furnace control system. The control of the feeding system will directly affect the operation status and steam production of the reverse grate furnace, and then affect the environmental emission indicators, the power generation of the generator set, etc. A Chinese patent with announcement number CN217154187U discloses a new automatic control system for garbage feeding grates and incineration grates, which utilizes the acquisition of parameters such as the primary air pressure of the first grate, the negative pressure in the furnace, the actual evaporation amount of the incinerator, the primary air pressure when the fifth grate is stationary, and the temperature of the burnout section, and processes them to achieve control of the driving speed of the feeding trolley of the feeding grate, the sliding speed of the first grate, and the sliding speed of the fifth grate, thereby improving the efficiency of garbage incineration treatment. It is not effectively linked to the top temperature of the first flue, and there is room for further improvement. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a reverse grate furnace feeding control system, which enables the reverse grate furnace to perform waste incineration treatment well and improves the waste incineration control effect and efficiency.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a reverse grate furnace feeding control system, the reverse grate furnace includes a boiler, a feeding grate and a burning grate, the control system includes a furnace temperature mode control unit, the furnace temperature mode control unit includes:

[0005] A temperature measuring instrument group, which is used to collect the temperature of a corresponding measuring point on the top of the first flue of the boiler;

[0006] A furnace temperature controller, the furnace temperature controller is connected to the output end of the temperature measuring instrument group, the furnace temperature controller is connected to the feeding grate and the incineration grate, the furnace temperature controller is used to calculate the average temperature value according to the temperature feedback from the temperature measuring instrument group, and is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the average temperature value and the temperature set value.

[0007] Furthermore, the temperature measuring instrument group includes a first temperature measuring instrument for collecting the temperature on the left side of the top of the first flue of the boiler, a second temperature measuring instrument for collecting the temperature on the left side of the middle of the top of the first flue of the boiler, a third temperature measuring instrument for collecting the temperature on the right side of the middle of the top of the first flue of the boiler, and a fourth temperature measuring instrument for collecting the temperature on the right side of the first flue of the boiler.

[0008] Furthermore, the temperature measuring instrument group includes N temperature measuring instruments. When Y temperature measuring instruments in the temperature measuring instrument group are faulty, the temperature measured by the faulty temperature measuring instrument is eliminated when the furnace temperature controller calculates the average temperature value, and the remaining temperatures collected are used to calculate the average temperature value; wherein, 1≤Y<N.

[0009] Furthermore, when all the temperature measuring instruments in the temperature measuring instrument group fail, the furnace temperature controller sets the corresponding temperature to a maximum value and controls the control system to stop working.

[0010] Furthermore, the control system further comprises a steam flow mode control unit, and the steam flow mode control unit comprises:

[0011] A steam flow sensor, wherein the steam flow sensor is used to collect the steam flow of the boiler;

[0012] A steam flow controller, the steam flow controller is connected to the output end of the steam flow sensor, the steam flow controller is connected to the feeding grate and the incineration grate, and the steam flow controller is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the collected steam flow and the set value of the steam flow.

[0013] Furthermore, the control system further comprises an infrared temperature steam flow mode control unit, and the infrared temperature steam flow mode control unit comprises:

[0014] A steam flow sensor, wherein the steam flow sensor is used to collect the steam flow of the boiler;

[0015] A steam flow controller, the steam flow controller is connected to the output end of the steam flow sensor, and the steam flow controller is used to calculate and output a second flue infrared temperature set value according to the difference between the steam flow fed back by the steam flow sensor and the steam flow set value;

[0016] An infrared temperature collector, which is used to collect the infrared temperature of the second flue of the boiler;

[0017] An infrared temperature controller is connected to the output end of the infrared temperature collector, and is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the infrared temperature fed back by the infrared temperature sensor and the given value of the second flue infrared temperature.

[0018] Furthermore, the present invention also provides a feeding control method for a reverse grate furnace, the reverse grate furnace comprising a boiler, a feeding grate and a burning grate, the method comprising a furnace temperature mode, the steps of the furnace temperature mode are as follows:

[0019] Collect the temperature of the corresponding measuring point on the top of the first flue of the boiler;

[0020] An average temperature value is calculated based on the collected temperatures, and a feeding speed of the feeding grate and / or a grate sliding speed of the incineration grate are controlled based on a difference between the average temperature value and a given temperature value.

[0021] Further, the method also includes a steam flow mode, and the steps of the steam flow mode are as follows:

[0022] Collect steam flow from boiler;

[0023] The feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate are controlled according to the difference between the collected steam flow rate and the set value of the steam flow rate.

[0024] Further, the method also includes an infrared temperature steam flow mode, and the steps of the infrared temperature steam flow mode are as follows:

[0025] Collect the steam flow of the boiler, calculate and output the second flue infrared temperature set value according to the difference between the collected steam flow and the steam flow set value;

[0026] The infrared temperature of the second flue of the boiler is collected, and the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate are controlled according to the difference between the collected infrared temperature and the given value of the infrared temperature of the second flue.

[0027] Furthermore, the reverse grate furnace feeding control method of the present invention is implemented based on the reverse grate furnace feeding control system.

[0028] After adopting the above technical solution, the present invention provides three operation modes, namely furnace temperature mode, steam flow mode, and infrared temperature steam flow mode, wherein the furnace temperature mode and steam flow mode are used during the start-up and shutdown of the furnace, and the infrared temperature steam flow mode is the control mode used during normal production. The three modes are associated with the feeding system through the important parameters such as the top temperature of the first flue of the boiler, the steam flow of the boiler, and the infrared temperature of the second flue, so that the reverse grate furnace can perform waste incineration treatment well and improve the control effect and efficiency of waste incineration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the boiler part of the present invention;

[0030] Figure 2 It is a control schematic diagram of the reverse grate furnace feeding control system of the present invention;

[0031] Figure 3 It is a control logic diagram under the furnace temperature mode of the present invention;

[0032] Figure 4 It is a control logic diagram under the steam flow mode of the present invention. DETAILED DESCRIPTION

[0033] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, the reverse grate furnace includes a boiler, a feeding grate and an incineration grate. The structure of the reverse grate furnace can be specifically referred to in the mechanical grate incinerator combustion control system and control method disclosed in the Chinese patent publication No. CN102235676A. The structure of the boiler of the reverse grate furnace is as shown in Figure 1 As shown, A is the first flue and B is the second flue.

[0035] like Figure 2 , 3 As shown, a reverse grate furnace feeding control system of this embodiment includes a furnace temperature mode control unit, and the furnace temperature mode control unit includes:

[0036] A temperature measuring instrument group, which is used to collect the temperature of the corresponding measuring point on the top of the first flue of the boiler;

[0037] A furnace temperature controller is connected to the output end of the temperature measuring instrument group. The furnace temperature controller is connected to the feeding grate and the incineration grate. The furnace temperature controller is used to calculate the average temperature value according to the temperature feedback from the temperature measuring instrument group, and to control the feeding speed of the feeding grate and the grate sliding speed of the incineration grate according to the difference between the average temperature value and the temperature set value, thereby realizing the control of the temperature at the top of the first flue.

[0038] Specifically, Figure 1 As shown, the corresponding temperature measuring points can be arranged in the first flue as follows: the temperature measuring instrument group includes a first temperature measuring instrument for collecting the temperature on the left side of the top of the first flue of the boiler, a second temperature measuring instrument for collecting the temperature on the left side of the middle of the top of the first flue of the boiler, a third temperature measuring instrument for collecting the temperature on the right side of the middle of the top of the first flue of the boiler, and a fourth temperature measuring instrument for collecting the temperature on the right side of the first flue of the boiler; Figure 1 In the figure, a, b, c, and d are four corresponding temperature measurement points.

[0039] Specifically, the temperature measuring instrument group includes N temperature measuring instruments. When Y temperature measuring instruments in the temperature measuring instrument group are faulty, the temperature measured by the faulty temperature measuring instrument is eliminated when the furnace temperature controller calculates the average temperature value, and the remaining temperatures collected are used to calculate the average temperature value; wherein, 1≤Y<N.

[0040] Specifically, when all the temperature measuring instruments in the temperature measuring instrument group fail, the furnace temperature controller sets the corresponding temperature to a maximum value and controls the control system to stop working.

[0041] Specifically, Figure 2 , 4 As shown, the control system also includes a steam flow mode control unit, and the steam flow mode control unit includes:

[0042] Steam flow sensor: The steam flow sensor is used to collect the steam flow of the boiler;

[0043] A steam flow controller is connected to the output end of the steam flow sensor. The steam flow controller is connected to the feeding grate and the incineration grate. The steam flow controller is used to control the feeding speed of the feeding grate and the grate sliding speed of the incineration grate according to the difference between the collected steam flow and the set value of the steam flow, thereby realizing the control of the boiler steam flow.

[0044] Furthermore, the control system further comprises an infrared temperature steam flow mode control unit, and the infrared temperature steam flow mode control unit comprises:

[0045] Steam flow sensor: The steam flow sensor is used to collect the steam flow of the boiler;

[0046] A steam flow controller, the steam flow controller is connected to the output end of the steam flow sensor, and is used to calculate and output a second flue duct infrared temperature set value according to the difference between the steam flow fed back by the steam flow sensor and the steam flow set value;

[0047] Infrared temperature collector, the infrared temperature collector is used to collect the infrared temperature of the second flue of the boiler; in this embodiment, the infrared temperature collector can be set at multiple points as needed;

[0048] The infrared temperature controller is connected to the output end of the infrared temperature collector and is used to control the feeding speed of the feeding grate according to the difference between the infrared temperature fed back by the infrared temperature sensor and the given value of the infrared temperature of the second flue.

[0049] Specifically, Figures 2 to 4 As shown, this embodiment provides a reverse grate furnace feeding control method, the method includes a furnace temperature mode, and the steps of the furnace temperature mode are as follows:

[0050] Collect the temperature of the corresponding measuring point on the top of the first flue of the boiler;

[0051] The average temperature value is calculated according to the collected temperature, and the feeding speed of the feeding grate and the grate sliding speed of the incineration grate are controlled according to the difference between the average temperature value and the temperature set value.

[0052] Specifically, Figure 4 As shown, the method also includes a steam flow mode, and the steps of the steam flow mode are as follows:

[0053] Collect steam flow from boiler;

[0054] The feeding speed of the feeding grate and the grate sliding speed of the incineration grate are controlled according to the difference between the collected steam flow rate and the set value of the steam flow rate.

[0055] Specifically, the method also includes an infrared temperature steam flow mode, and the steps of the infrared temperature steam flow mode are as follows:

[0056] Boiler steam volume closed-loop control, collects the steam flow of the boiler, calculates and outputs the second flue infrared temperature set value based on the difference between the collected steam flow and the steam flow set value;

[0057] The infrared temperature of the second flue of the boiler is collected, and the feeding speed of the feeding grate is controlled according to the difference between the collected infrared temperature and the given value of the infrared temperature of the second flue, thereby realizing the control of the infrared temperature.

[0058] The infrared temperature steam flow mode is put into operation under normal operating conditions. That is to say, when there are no abnormal conditions, such as boiler startup, shutdown, main equipment failure, etc., the boiler steam basically reaches the normal load.

[0059] In this embodiment, the furnace temperature mode and the steam flow mode are only used during furnace startup and shutdown, and the infrared temperature steam flow mode is the control mode used during normal production.

[0060] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A feeding control system for a reverse grate furnace, the reverse grate furnace comprising a boiler, a feeding grate and a burning grate, characterized in that: The control system includes a furnace temperature mode control unit, and the furnace temperature mode control unit includes: A temperature measuring instrument group, which is used to collect the temperature of a corresponding measuring point on the top of the first flue of the boiler; A furnace temperature controller, the furnace temperature controller is connected to the output end of the temperature measuring instrument group, the furnace temperature controller is connected to the feeding grate and the incineration grate, the furnace temperature controller is used to calculate the average temperature value according to the temperature feedback from the temperature measuring instrument group, and is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the average temperature value and the temperature set value.

2. The reverse grate furnace feeding control system according to claim 1, characterized in that: The temperature measuring instrument group includes a first temperature measuring instrument for collecting the temperature on the left side of the top of the first flue of the boiler, a second temperature measuring instrument for collecting the temperature on the left side of the middle of the top of the first flue of the boiler, a third temperature measuring instrument for collecting the temperature on the right side of the middle of the top of the first flue of the boiler, and a fourth temperature measuring instrument for collecting the temperature on the right side of the first flue of the boiler.

3. The reverse grate furnace feeding control system according to claim 1, characterized in that: The temperature measuring instrument group includes N temperature measuring instruments. When Y temperature measuring instruments in the temperature measuring instrument group are faulty, when the furnace temperature controller calculates the average temperature value, the temperature measured by the faulty temperature measuring instrument is eliminated and the average temperature value is calculated using the remaining temperatures collected; wherein 1≤Y<N.

4. The reverse grate furnace feeding control system according to claim 1, characterized in that: When all the temperature measuring instruments in the temperature measuring instrument group fail, the furnace temperature controller sets the corresponding temperature to the maximum value and controls the control system to stop working.

5. The reverse grate furnace feeding control system according to claim 1, characterized in that: The control system further includes a steam flow mode control unit, which includes: A steam flow sensor, wherein the steam flow sensor is used to collect the steam flow of the boiler; A steam flow controller, the steam flow controller is connected to the output end of the steam flow sensor, the steam flow controller is connected to the feeding grate and the incineration grate, and the steam flow controller is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the collected steam flow and the set value of the steam flow.

6. The reverse grate furnace feeding control system according to claim 1, characterized in that: The control system also includes an infrared temperature steam flow mode control unit, which includes: A steam flow sensor, wherein the steam flow sensor is used to collect the steam flow of the boiler; A steam flow controller, the steam flow controller is connected to the output end of the steam flow sensor, and the steam flow controller is used to calculate and output a second flue infrared temperature set value according to the difference between the steam flow fed back by the steam flow sensor and the steam flow set value; An infrared temperature collector, which is used to collect the infrared temperature of the second flue of the boiler; An infrared temperature controller is connected to the output end of the infrared temperature collector, and is used to control the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate according to the difference between the infrared temperature fed back by the infrared temperature sensor and the given value of the second flue infrared temperature.

7. A method for controlling feeding of a reverse grate furnace, the reverse grate furnace comprising a boiler, a feeding grate and a burning grate, characterized in that: The method includes a furnace temperature mode, and the steps of the furnace temperature mode are as follows: Collect the temperature of the corresponding measuring point on the top of the first flue of the boiler; An average temperature value is calculated based on the collected temperatures, and a feeding speed of the feeding grate and / or a grate sliding speed of the incineration grate are controlled based on a difference between the average temperature value and a given temperature value.

8. The reverse grate furnace feeding control method according to claim 7, characterized in that: The method also includes a steam flow mode, the steps of the steam flow mode are as follows: Collect steam flow from boiler; The feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate are controlled according to the difference between the collected steam flow rate and the set value of the steam flow rate.

9. The reverse grate furnace feeding control method according to claim 7, characterized in that: The method also includes an infrared temperature steam flow mode, the steps of the infrared temperature steam flow mode are as follows: Collect the steam flow of the boiler, calculate and output the second flue infrared temperature set value according to the difference between the collected steam flow and the steam flow set value; The infrared temperature of the second flue of the boiler is collected, and the feeding speed of the feeding grate and / or the grate sliding speed of the incineration grate are controlled according to the difference between the collected infrared temperature and the given value of the infrared temperature of the second flue.

10. The reverse grate furnace feeding control method according to claim 7, characterized in that: The reverse grate furnace feeding control system is implemented based on any one of claims 1 to 6.

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