Combustion and automatic control system of magnetic material rotary kiln

Abstract

The invention belongs to the field of combustion furnaces, particularly relates to a combustion and automatic control energy-saving system of a magnetic material rotary kiln, and relates to the technical field of automatic control. Comprising a staged burner, the left side of the staged burner is provided with an ignition system, a main gas system, a main air system, a fixing frame and a control cabinet, the right end of the ignition system is connected with the staged burner, and the left side end is divided into two paths, the main air system and the flame detection UV are connected to the control cabinet through wires, the right side of the main gas system is connected with the graded combustor, the left side of the main gas system is connected with a gas pipeline source, the right side of the main air system is connected with the graded combustor, and the left side of the main air system is connected with the combustion fan. The invention discloses a system capable of automatically adjusting the temperature, and aims to improve the combustion efficiency and the product quality of a magnetic material rotary kiln and reduce the energy consumption at the same time. The temperature in the kiln can be monitored and adjusted in real time, and the stability and high efficiency of the production process are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic material processing, in particular to a combustion and automatic control system for a magnetic material rotary kiln. Background Art

[0002] A rotary kiln is a large, slowly rotating cylindrical heat treatment equipment widely used in processes such as heating, calcining and chemical reactions of materials. The material enters from one end of the kiln (usually the high end) and gradually moves to the other end (the low end) as the kiln body rotates. The kiln body is equipped with a burner to generate high temperature by burning fuel (such as coal, natural gas, etc.). Heat is transferred to the material by radiation and convection. In this process, the material is heated and undergoes physical or chemical changes.

[0003] The prior art has the following problems:

[0004] 1. The burner cannot guarantee the raw material's requirements for the burner's thermal energy, the combustion is unstable, and the NOx value of the emission is reduced to more than 120mg / Nm 3 , there are particulate matter emissions;

[0005] 2. The combustion system cannot realize automatic ignition, fire detection and temperature control, and there are no safety functions such as leakage detection, leakage cut-off and flameout cut-off, resulting in high fuel consumption;

[0006] 3. The temperature deviation in the kiln is ±10℃;

[0007] 4. The production process cannot be displayed dynamically in real time, accident records, process parameter settings and display records cannot be recorded

[0008] In order to solve the above problems, a combustion and automatic control system for a magnetic material rotary kiln is provided. Summary of the invention

[0009] (I) Purpose of the invention

[0010] In order to solve the technical problems existing in the background technology, the present invention proposes a combustion and automatic control system for a magnetic material rotary kiln, which has the advantages of stable combustion, energy saving, automatic system control, and high temperature difference control accuracy.

[0011] (II) Technical solution

[0012] In order to solve the above technical problems, the present invention belongs to the field of combustion furnaces, and specifically relates to a combustion and automatic control system of a magnetic material rotary kiln, and relates to the field of automatic control technology.

[0013] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a combustion and automatic control system for a magnetic material rotary kiln, comprising a staged burner (24), wherein the left side of the staged burner (24) is provided with an ignition system (22), a main gas system (40), a main air system (41), a fixing frame (42) and a control cabinet (39); the right end of the ignition system (22) is connected to the staged burner (24), and the left end is divided into two paths, the first path is connected to the main gas system (40) through a mother fire steel pipe (44), and the other end of the second path is connected to the main air system (41) where a combustion-supporting fan (35) is located through a combustion-supporting ball valve (27); the right side of the main gas system (40) is connected to the staged burner (24), and the left side is connected to the source of the gas pipeline; the right side of the main air system (41) is connected to the staged burner (24), and the left side is connected to the combustion-supporting fan (35).

[0014] As an improvement of the present application, the ignition system (22) comprises a mother fire flexible pipe (21), two mother fire solenoid valves (18) (19), a mother fire pressure regulator (17) and a mother fire ball valve (16), wherein the mother fire flexible pipe (21), the two mother fire solenoid valves (18) (19), the mother fire pressure regulator (17) and the mother fire ball valve (16) are connected via a mother fire steel pipe (44), and are connected to a main gas system (40) using a mother fire flexible sleeve (43), and the two mother fire solenoid valves (18) (19) are connected to a control cabinet (39) via wires.

[0015] As an improvement of the present application, the ignition system (22) is connected to the main air system (41) through a combustion-supporting joint sleeve (45), a combustion-supporting pressure stabilizer (31), a combustion-supporting ball valve (27) and a combustion-supporting steel pipe (46).

[0016] As an improvement of the present application, the ignition system (22) is connected to the control cabinet (39) by a fire detection UV (37) through a wire.

[0017] As an improvement of the present application, the main coal gas system (40) comprises a flexible connection (15), a manual regulating valve (14), a coal gas pneumatic butterfly valve (12), a leak detection pressure switch + root valve (13), a coal gas pneumatic butterfly valve (11), a coal gas regulating valve (10), an orifice flowmeter (9), a relief ball valve (6), a pressure gauge (5), a pressure ball valve (4), two pressure ball valves + root valve (7)(8), a filter (3), a relief ball valve (2) and a manual ball valve (1), which are connected by a main coal gas steel pipe (47), the left end of the manual ball valve (1) is connected to the source of the coal gas pipeline, the coal gas pneumatic butterfly valve (12), the leak detection pressure switch + root valve (13), the coal gas pneumatic butterfly valve (11), the coal gas regulating valve (10), the orifice flowmeter (9), two pressure ball valves + root valve (7)(8) are connected to the control cabinet (39) through wires, and the coal gas pneumatic butterfly valve (12) and the coal gas pneumatic butterfly valve (11) are connected to compressed air through a conduit.

[0018] As an improvement of the present application, the main air system (41) includes a main air manual valve (32), a secondary air regulating valve (26), a bellows (30), a main air regulating valve (25), a main air orifice flow meter (34) and a thermocouple (33), which are connected to the combustion-supporting fan (35) through an air duct (48), and the secondary air regulating valve (26), the main air regulating valve (25), the main air orifice flow meter (34) and the thermocouple (33) are connected to a control cabinet (39) through wires.

[0019] The above technical solution of the present invention has the following beneficial technical effects:

[0020] 1. Through the setting of two mother fire solenoid valves in the ignition system, the rotary kiln furnace can form a mixed combustible gas with gas and air, and then complete the automatic ignition through the ignition electrode in the automatic control system. The fire detection UV detects whether the ignition is successful and uploads the result to the PLC in the electrical cabinet. The PLC feeds back the information to the main control computer to realize remote automatic ignition.

[0021] 2. The gas regulating valve and air regulating valve can be remotely set through the main control computer command, so that the flame can be fully burned. The main control computer can display the temperature in the furnace in real time, and control the opening of the gas regulating valve through the PLC program to achieve gas energy saving effect. The newly developed staged burner can effectively reduce the generation of nitrogen oxides during the combustion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the ignition structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the main gas system and the main air system of the present invention;

[0025] Figure 4 It is a schematic diagram of the PID of the present invention.

[0026] Reference numerals:

[0027] 1. Manual ball valve; 2. Release ball valve; 3. Filter; 4. Pressure ball valve; 5. Pressure gauge; 6. Release ball valve; 7. First pressure ball valve and root valve; 8. Second pressure ball valve and root valve; 9. Orifice flowmeter; 10. Gas regulating valve; 11. Gas pneumatic butterfly valve; 12. Gas pneumatic butterfly valve; 13. Leak detection pressure switch box root valve; 14. Manual regulating valve; 15. Soft connection; 16. Mother fire ball valve; 17. Mother fire regulator; 18. Mother fire solenoid valve; 19. Mother fire solenoid valve; 21. Mother fire soft connection pipe; 22. Ignition system; 24, staged burner; 25, main air regulating valve; 26, secondary air regulating valve; 27, combustion-supporting ball valve; 30, bellows; 32, main air manual valve; 33, thermocouple; 34, main air orifice flowmeter; 35, combustion-supporting fan; 37, fire detection UV; 39, control cabinet; 40, main gas system; 41, main air system; 42, fixing bracket; 43, mother fire joint; 44, mother fire steel pipe; 45, combustion-supporting joint; 46, combustion-supporting steel pipe; 47, main gas steel pipe; 48, air duct; DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0029] like Figure 1-4 As shown, a combustion and automatic control system for a magnetic material rotary kiln includes a staged burner 24, and the left side of the staged burner 24 is respectively composed of an ignition system 22, a main gas system 40, a main air system 41, a fixing frame 42 and a control cabinet 39. The right end of the ignition system 22 is connected to the staged burner 24, and the left end is divided into two paths. The first path is connected to the main gas system (40) through a mother fire steel pipe (44), and the other end of the second path is connected to the main air system (41) where a combustion-supporting fan (35) is located through a combustion-supporting ball valve (27). The right side of the main gas system 40 is connected to the staged burner 24, and the left side is connected to the gas pipeline source. The right side of the main air system 41 is connected to the staged burner 24, and the left side is connected to the combustion-supporting fan 35.

[0030] In this embodiment, in order to realize automatic ignition and fire detection of the combustion system, the main control computer controls the opening and closing of the two mother fire solenoid valves 18 and 19 through the PLC program to generate gas outflow from the mother fire pipeline, and controls the ignition electrode to automatically ignite the premixed gas. The main control computer determines whether the ignition is successful by the fire detection UV3 7 signal through the PLC program.

[0031] In this embodiment, in order to solve the problem of automatic temperature control of the combustion system, the PLC program returns the value of the temperature sensor to execute the opening size of the gas regulating valve 10 and the main air regulating valve 25 according to the preset instructions.

[0032] The working principle and use process of the present invention are as follows: the rotary kiln is ignited by the ignition system 22 first. After the ignition is successful, the two gas pneumatic butterfly valves 11 and 12 in the main gas system 40 give signals through the PLC to change them from normally closed to normally open. The gas regulating valve 10 opens the opening to a certain proportion value according to the instructions preset by the PLC program. At the same time, the main air regulating valve 25 and the secondary air regulating valve 26 in the main air system 41 also open the opening to a certain proportion value according to the instructions preset by the PLC. As the temperature rises, the gas regulating valve 10, the main air regulating valve 25 and the secondary air regulating valve 26 will also open the opening to a suitable proportion value according to the instructions preset by the PLC.

[0033] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A combustion and automatic control system for a magnetic material rotary kiln, characterized in that: The invention comprises a staged burner (24), wherein the left side of the staged burner (24) is provided with an ignition system (22), a main gas system (40), a main air system (41), a fixing frame (42) and a control cabinet (39); the right end of the ignition system (22) is connected to the staged burner (24), and the left end is divided into two paths, the first path is connected to the main gas system (40) through a mother fire steel pipe (44), and the other end of the second path is connected to the main air system (41) where a combustion-supporting fan (35) is located through a combustion-supporting ball valve (27); the right side of the main gas system (40) is connected to the staged burner (24), and the left side is connected to the source of the gas pipeline; the right side of the main air system (41) is connected to the staged burner (24), and the left side is connected to the combustion-supporting fan (35).

2. The combustion and automatic control system of a magnetic material rotary kiln according to claim 1, characterized in that: The ignition system (22) comprises a mother fire flexible pipe (21), two mother fire solenoid valves (18) (19), a mother fire pressure regulator (17) and a mother fire ball valve (16), wherein the mother fire flexible pipe (21), the two mother fire solenoid valves (18) (19), the mother fire pressure regulator (17) and the mother fire ball valve (16) are connected via a mother fire steel pipe (44), and are connected to a main gas system (40) via a mother fire flexible sleeve (43), and the two mother fire solenoid valves (18) (19) are connected to a control cabinet (39) via wires.

3. The combustion and automatic control system of a magnetic material rotary kiln according to claim 1, characterized in that: The ignition system (22) is connected to the main air system (41) through a combustion-supporting joint sleeve (45), a combustion-supporting pressure stabilizer (31), a combustion-supporting ball valve (27) and a combustion-supporting steel pipe (46).

4. The combustion and automatic control system of a magnetic material rotary kiln according to claim 1, characterized in that: The ignition system (22) is connected to the control cabinet (39) through a wire from the fire detection UV (37).

5. The combustion and automatic control system of a magnetic material rotary kiln according to claim 1, characterized in that: The main coal gas system (40) comprises a flexible connection (15), a manual regulating valve (14), a gas pneumatic butterfly valve (12), a leak detection pressure switch and a root valve (13), a gas pneumatic butterfly valve (11), a gas regulating valve (10), an orifice flow meter (9), a relief ball valve (6), a pressure gauge (5), a pressure ball valve (4), a first pressure ball valve and a root valve (7) and a second pressure ball valve and a root valve (8), a filter (3), a relief ball valve (2) and a manual ball valve (1), and the main coal gas system (40) comprises a flexible connection (15), a manual regulating valve (14), a gas ... leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), a gas leak detection pressure switch and a root valve (13), The left end of the manual ball valve (1) is connected to the gas steel pipe (47), and the left end of the manual ball valve (1) is connected to the source of the gas pipeline, wherein the gas pneumatic butterfly valve (12), the leak detection pressure switch and the root valve (13), the gas pneumatic butterfly valve (11), the gas regulating valve (10), the orifice flow meter (9), the first pressure ball valve and the root valve (7) and the second pressure ball valve and the root valve (8) are connected to the control cabinet (39) through wires, and the gas pneumatic butterfly valve (12) and the gas pneumatic butterfly valve (11) are connected to the compressed air through the air conduit.

6. The combustion and automatic control system of a magnetic material rotary kiln according to claim 1, characterized in that: The main air system (41) includes a main air manual valve (32), a secondary air regulating valve (26), a bellows (30), a main air regulating valve (25), a main air orifice flow meter (34) and a thermocouple (33), which are connected to each other through an air duct (48) and to a combustion-supporting air fan (35), and the electrical control parts of the secondary air regulating valve (26), the main air regulating valve (25), the main air orifice flow meter (34) and the thermocouple (33) are connected to a control cabinet (39) through wires.

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