Plasma combustion-supporting device of combustor in rotary kiln for potash fertilizer production

Abstract

The plasma combustion-supporting device of the combustor in the rotary kiln for potash fertilizer production comprises a plasma generator and a combustion chamber, the plasma generator is arranged in the combustion chamber, and the plasma generator is mainly composed of a cathode assembly, an anode assembly and a coil assembly. A combustion air pipeline and a fuel gas supply channel are arranged on the combustion chamber, a gas inlet of the fuel gas supply channel and a gas inlet of the combustion air pipeline are connected with a central gas ignition pipeline, and the central gas ignition pipeline is connected with an electric adjusting mixing valve. According to the plasma combustion technology, fuel is combusted and decomposed more sufficiently, energy waste and tail gas pollution caused by incomplete combustion of the fuel can be avoided due to rapid temperature rise, the plasma combustion technology is characterized in that pressurized air is ionized under the action of an electric arc, high-temperature plasma is generated after ionization, and the high-temperature plasma is fully mixed with fuel gas to be combusted more sufficiently.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of potassium-soluble potassium fertilizer production, in particular to a plasma combustion-supporting device of a rotary kiln burner for potassium fertilizer production. BACKGROUND

[0002] In modern industrial production, especially in the process of potassium fertilizer production, a kiln is needed to be used for sintering, wherein the performance of the burner directly affects the production efficiency and product quality during the sintering process. The traditional burner relies on spark plugs or flame injection for ignition, and has slow ignition speed, poor reliability, low ignition efficiency and is easily affected by environmental factors, resulting in ignition failure. During the combustion process, the combustion is not sufficient due to the uneven mixing of combustion-supporting air and fuel, resulting in a large amount of incompletely combusted products, which affects the combustion efficiency and environmental performance. The electrode material of the burner is easily damaged in a high-temperature environment, and needs to be frequently replaced, thereby increasing the maintenance cost and downtime. SUMMARY

[0003] The technical problem to be solved by the application is to overcome the existing defects and provide a plasma combustion-supporting device of a rotary kiln burner for potassium fertilizer production, which can effectively solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a plasma combustion-supporting device of a rotary kiln burner for potassium fertilizer production, comprising a plasma generator and a combustion chamber, wherein the plasma generator is arranged in the combustion chamber, the plasma generator mainly comprises a cathode assembly, an anode assembly and a coil assembly, a combustion-supporting air pipeline and a fuel gas supply channel are arranged on the combustion chamber, a central fuel gas ignition pipeline is connected to the gas inlets of the fuel gas supply channel and the combustion-supporting air pipeline, the central fuel gas ignition pipeline is connected to an electrically-controlled mixing valve, a terminal stud is arranged in the combustion chamber, the terminal stud is connected to the anode assembly and the cathode assembly in the plasma generator, a cylindrical moving body is connected to the cathode assembly in the plasma generator, the cylindrical moving body is connected to an external driving mechanism, the coil assembly in the plasma generator comprises an inductor coil and a ceramic solidification sleeve, a zirconium-containing ceramic is cast outside the spiral part of the inductor coil to form a ceramic solidification sleeve, the solidification sleeve is hollow and coaxially arranged with the inductor coil, and a quartz tube for cooling is arranged in the solidification sleeve.

[0005] As a preferred technical scheme of the application, the head of the cathode rod at the end of the cathode assembly is a replaceable structure.

[0006] As a preferred technical scheme of the application, the cathode assembly and the anode assembly are made of any one of zirconium or water-cooled copper.

[0007] As a preferred technical scheme of the present application, the quartz tube is internally provided with feeding and discharging parts for cooling.

[0008] As a preferred technical scheme of the present application, the plasma generator mainly consists of a cathode assembly, an anode assembly and a coil assembly, the anode assembly is oppositely arranged with the cathode assembly, and the coil assembly is correspondingly arranged around the cathode assembly and the anode assembly.

[0009] As a preferred technical scheme of the present application, the quartz tube is of a hollow structure, and the hollow quartz tube is provided with a fluid passage between the quartz tube and the ceramic curing sleeve.

[0010] As a preferred technical scheme of the present application, the fluid passage is internally provided with a cooling heat exchange medium.

[0011] Compared with the prior art, the plasma combustion technology in the present application can generate high temperature, so that the fuel combustion is more sufficient, and the energy waste and tail gas pollution caused by incomplete fuel combustion can be avoided due to rapid heating. The plasma combustion technology is to ionize the pressurized air gas under the action of electric arc, and the ionized high-temperature plasma is fully mixed and combusted with the fuel gas. The head of the cathode assembly is a replaceable component, which can be quickly maintained and replaced in later use. In the case of excessive wear of the cathode and possible equipment failure repair, the damage caused by the plasma discharge at the tip to the ignition device is minimized. The coil as a whole has the ability to withstand direct current voltage breakdown under high temperature, and the power supply is full-wave rectification and has the performance and efficacy of stable constant current. The main cooling circuit can fully take away the heat overload while not reducing its thermal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a plasma igniter;

[0013] Fig. 2 It is a left view of the plasma igniter body.

[0014] In the figure: 1 electrically adjustable mixing valve, 2 fuel gas supply passage, 3 combustion air pipeline, 4 feeding part, 5 discharging part, 6 cathode assembly, 7 coil assembly, 8 anode assembly, 9 anode cavity, 10 head. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0016] Please refer to Figs. 1-2 The application provides a technical solution: a plasma combustion-supporting device for a rotary kiln burner in potash fertilizer production, comprising a plasma generator and a combustion chamber. The plasma generator is mainly composed of a cathode assembly 6, an anode assembly 8, and a coil assembly 7. The combustion chamber is provided with a combustion-supporting air pipeline 3 and a fuel gas supply channel 2. The fuel gas supply channel 2 and the combustion-supporting air pipeline 3 are connected with a central fuel gas ignition pipeline. The central fuel gas ignition pipeline is connected with an electrically-controlled mixing valve 1.

[0017] The plasma generator is responsible for generating high-temperature plasma for quickly igniting fuel. The combustion-supporting air pipeline 3 is used to transport combustion-supporting air into the combustion chamber to ensure sufficient combustion of fuel. The fuel gas supply channel 2 is used to transport fuel into the combustion chamber. The central fuel gas ignition pipeline connects the combustion-supporting air pipeline 3 and the fuel gas supply channel 2 to transport the mixed fuel gas to the ignition position in the combustion chamber. The electrically-controlled mixing valve 1 is installed at the inlet of the central fuel gas ignition pipeline to adjust the ratio of fuel gas and combustion-supporting air entering the combustion chamber, ensuring the combustion efficiency and safety.

[0018] The combustion chamber is provided with a terminal post, which is connected with the anode assembly 8 and the cathode assembly 6 in the plasma generator.

[0019] The terminal post is installed in the combustion chamber to connect the anode assembly 8 and the cathode assembly 6 in the plasma generator, providing necessary power connection.

[0020] The cathode assembly 6 in the plasma generator is connected with a cylindrical moving body, which is connected with an external driving mechanism.

[0021] The cathode assembly 6 is connected with the external driving mechanism through the cylindrical moving body, which is used to adjust the distance between the cathode rod and the anode assembly 8 to control the generation conditions of plasma. This kind of adjustment mechanism can accurately control the generation conditions of electric arc, thereby optimizing the generation efficiency and quality of plasma.

[0022] The coil assembly 7 in the plasma generator includes an inductor coil and a ceramic solidification sleeve. The inductor coil is poured with zirconium-containing ceramic outside the spiral part to form a ceramic solidification sleeve. The solidification sleeve is hollow and coaxially arranged with the inductor coil, and a quartz tube for cooling is arranged in the solidification sleeve.

[0023] The coil assembly 7 generates a strong magnetic field to compress ionized gas into high-temperature plasma. The coil assembly 7 as a whole has the ability to withstand direct current voltage breakdown under high temperature conditions, and the power supply is full-wave rectified and has the performance function of stable constant current. The ceramic solidification sleeve is poured with zirconium-containing ceramic, which provides additional insulation protection to prevent voltage breakdown in high-temperature environments.

[0024] Further, the head 10 of the cathode rod at the end of the cathode assembly 6 is replaceable.

[0025] The cathode assembly 6 is made of a material with high electrical conductivity, high thermal conductivity and oxidation resistance (such as zirconium or water-cooled copper), which ensures stable operation for a long time in a high-temperature environment; the replaceable head 10 of the cathode rod at the end of the cathode assembly 6 facilitates quick replacement after long-term use, reducing maintenance costs; when the cathode rod head 10 is worn or damaged due to long-term use, a new cathode rod head can be quickly replaced without the need to replace the entire cathode assembly 8, extending the service life of the equipment and reducing maintenance costs and downtime.

[0026] Further, the cathode assembly 6 and the anode assembly 8 are made of any one of zirconium or water-cooled copper.

[0027] Zirconium or water-cooled copper as the material of the cathode assembly 6 and the anode assembly 8 significantly improves the performance and reliability of the plasma combustion-assisting device, and the circulating cooling device in the circuit resists the high-temperature impact generated by the discharge arc

[0028] Further, the quartz tube is provided with an inlet piece 4 and an outlet piece 5 for cooling.

[0029] The quartz tube is provided with an inlet piece 4 and an outlet piece 5 for the entry and exit of cooling medium. The cooling medium in the fluid channel circulates and flows, fully removing heat overload while not reducing its thermal efficiency, ensuring stable operation of the coil assembly 7 in a high-temperature environment.

[0030] Further, the anode assembly 8 is arranged opposite to the cathode assembly 6, and the coil assembly 7 is arranged around the cathode assembly 6 and the anode assembly 8 correspondingly.

[0031] Further, the quartz tube is a hollow structure, and the hollow quartz tube and the ceramic solidification sleeve are provided with a fluid channel therebetween.

[0032] Further, a heat exchange medium for cooling circulates in the fluid channel.

[0033] Further, the heat exchange medium is desalted water.

[0034] In use: after power on, the terminal post is connected with the cathode assembly 6 and the anode assembly 8, a stable current is applied between the cathode assembly 6 and the anode assembly 8, and at the same time, the cathode assembly 6 is driven by the external driving mechanism to move the columnar moving body to contact the anode assembly 8, at this time, the system is short-circuited and the current remains constant, the coil assembly 7 generates a strong magnetic field after being powered on, when the cathode assembly 6 slowly leaves the anode assembly 8, the electric arc is pulled up under the action of the magnetic field of the coil assembly 7, and the air between the two poles is ionized to form high-temperature and conductive plasma, thereby generating high temperature and playing a combustion-supporting role, at the same time, the strong magnetic field generated by the coil assembly 7 can compress the plasma, and the compressed plasma is blown out of the anode cavity 9 by the compressed air, and the discharge participates in combustion.

[0035] It is worth noting that: the plasma generator can work continuously after ignition (the cathode and anode are continuously powered and the arc is supplied with air), and high temperature can be generated during continuous work to promote the rapid heating of the kiln system where the burner is located to a certain extent and to maintain it, thereby shortening the production equipment startup time and increasing the aging time. The external control system can also adjust the plasma generator to the disconnected state after ignition to reduce power consumption. At the same time, if it enters the automatic adjustment state, it can realize switching at any time with the assistance of various temperature sensors, flame monitors and the like to ensure the stable heating of the burner.

[0036] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A plasma combustion-supporting device for a rotary kiln burner for potash production, comprising a plasma generator and a combustion chamber, wherein the plasma generator is arranged in the combustion chamber, and the plasma generator is mainly composed of a cathode assembly (6), an anode assembly (8) and a coil assembly (7), characterized in that: The combustion chamber is provided with a combustion air duct (3) and a fuel supply passage (2), the fuel supply passage (2) and the combustion air duct (3) are connected with a center gas ignition duct, the center gas ignition duct is connected with an electrically-controlled mixing valve (1), the combustion chamber is provided with a terminal post, the terminal post is connected with an anode assembly (8) and a cathode assembly (6) in a plasma generator, the cathode assembly (6) in the plasma generator is connected with a cylindrical moving body, the cylindrical moving body is connected with an external driving mechanism, a coil assembly (7) in the plasma generator comprises an inductor coil and a ceramic solidification sleeve, zirconium-containing ceramic is cast outside the spiral part of the inductor coil to form a ceramic solidification sleeve, the solidification sleeve is hollow and coaxially arranged with the inductor coil, and a quartz tube for cooling is arranged in the solidification sleeve.

2. A plasma-assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 1, characterized in that: The head (10) of the cathode rod at the end of the cathode assembly (6) is a replaceable structure.

3. A plasma-assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 1, characterized in that: The cathode assembly (6) and the anode assembly (8) are made of any one of zirconium or water-cooled copper.

4. A plasma-assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 1, characterized in that: The quartz tube is provided with a feeding member (4) and a discharging member (5) for cooling.

5. A plasma assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 1, characterized in that: The anode assembly (8) is oppositely arranged with the cathode assembly (6), and the coil assembly (7) is correspondingly arranged around the cathode assembly (6) and the anode assembly (8).

6. A plasma-assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 1, characterized in that: The quartz tube is a hollow structure, and a fluid channel is arranged between the hollow quartz tube and the ceramic solidification sleeve.

7. A plasma-assisted combustion device for a burner in a rotary kiln for the production of potash fertilizer according to claim 6, characterized in that: The fluid channel is provided with a cooling heat exchange medium.

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