Plasma and slag ohm integrated heating and melting furnace

Abstract

The utility model relates to the technical field of solid waste treatment melting furnaces, and particularly discloses a plasma and slag ohm integrated heating melting furnace which comprises a furnace body and a furnace cover, the interior of the furnace body is divided into two melting pools by a partition wall, and the lower end of the partition wall is provided with a melting pool connecting channel used for communicating the two melting pools. The furnace body located above the partition wall is provided with a feeding port, the bottoms of the two molten pools are each provided with a metal discharging port and a bottom electrode, a switch is connected between the two bottom electrodes through a wire, an electrode is arranged on the furnace cover located over the two molten pools, and a flowing channel is formed in the upper end of the furnace body. The two ends of the flowing channel communicate with the upper ends of the two molten pools, and a melt discharging opening is formed in the bottom of the flowing channel. According to the device, arc plasma and slag ohm integrated heating are organically combined together, and the problems that slag discharging is difficult, and the energy utilization rate is low due to the fact that temperature difference exists between melt in a molten pool and a flowing channel are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid waste treatment melting furnace technical field, specifically disclose a plasma and slag ohm integrated heating melting furnace. BACKGROUND

[0002] With the improvement of the national environmental protection requirement, a large number of industrial solid wastes have been closely monitored and rationally treated. The existing industrial solid waste treatment usually adopts incineration, and the most common equipment for incineration treatment is arc melting furnace.

[0003] The application No. 200910184971.5 discloses a device and method for disposing solid waste by hot plasma, which comprises a plasma melting pyrolysis furnace, a hot plasma generating device, a working gas preparation and supply device, a feeding device, a slag discharge and metal melt discharge device, a tail gas purification treatment system and a corresponding measurement control system. The device can completely destroy the toxic and harmful organic components in various solid wastes through the plasma melting pyrolysis furnace, and at the same time, the waste is basically converted into useful gas, stable, non-leaching toxic glass slag and recyclable metal components, effectively realizing the effective treatment of industrial solid waste. However, the plasma melting pyrolysis furnace disclosed in the utility model still has problems such as difficult furnace starting, uneven temperature field and difficult slag discharge. This is because some industrial solid wastes are mainly non-metallic, and such waste is not conductive in non-melting state, which will cause great problems when the furnace needs to be restarted in case of emergency. In addition, the temperature at the slag discharge port position is usually lower than that at the arc melting position, which leads to poor flowability of the molten liquid at the slag discharge port and difficult slag discharge. Therefore, in view of the above problems of the existing plasma melting pyrolysis furnace, a new design of plasma and slag ohm integrated heating melting furnace is proposed to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a plasma and slag ohm integrated heating melting furnace to solve the problems of difficult furnace starting and difficult slag discharge due to large temperature field difference when the existing plasma melting furnace is used to treat solid waste mainly composed of non-metallic materials.

[0005] The utility model is achieved by the following technical solutions:

[0006] A plasma and molten slag ohmic integrated heating and melting furnace includes a furnace body and a furnace cover. The interior of the furnace body is divided into two molten pools by a partition wall. The lower end of the partition wall is provided with a molten pool connection channel for connecting the two molten pools. The furnace body located above the partition wall is provided with a feed port. The bottom of each of the two molten pools is provided with a metal discharge port and a bottom electrode. The two bottom electrodes are connected by a switch through a wire. The furnace cover located directly above the two molten pools is provided with an electrode for generating electric arc plasma.

[0007] The upper end of the furnace body is provided with a flow channel, and the two ends of the flow channel are connected to the upper ends of two molten pools. A molten material outlet is provided at the bottom of the flow channel, and a plug is provided in the molten material outlet. A baffle is provided at the position where the flow channel is connected to the molten pool, and the upper end of the baffle is connected to the furnace cover, and the lower end is reserved at a certain distance from the bottom wall of the flow channel.

[0008] As a further feature of the above scheme, the flow channel is elongated and separated into two sides by a fire-resistant partition wall in the middle, and the molten material outlet is located at the turning point of the flow channel.

[0009] As a further feature of the above scheme, the turning position of the flow channel is set in a U-shape or semi-circle, and the molten material outlet is located in the middle of the turning position of the flow channel.

[0010] As a further feature of the above scheme, the side of the furnace body is provided with an air vent that communicates with the molten pool.

[0011] As a further feature of the above scheme, the furnace cover is provided with a flue gas exhaust port.

[0012] As a further feature of the above scheme, the feed inlet is centrally located directly above the partition wall, and the top of the partition wall is provided with a guide block to evenly distribute the material fed into the feed inlet. Beneficial effects

[0013] This invention organically combines electric arc plasma and molten slag ohmic heating, making full use of the high temperature and Joule heating characteristics of plasma. When treating solid waste, it is first melted by the high temperature of plasma electric arc, and then subjected to continuous Joule heating after entering the molten pool and flow channel, maintaining uniform temperature, making more efficient use of energy and reducing energy consumption.

[0014] The molten pool and flow channel in this invention adopt an upper and lower stepped design, which can effectively construct an integrated slag heating channel, thereby ensuring a uniform temperature distribution of the molten material inside the molten pool, efficiently utilizing Joule heat, and avoiding the problems of temperature difference between the molten material inside the molten pool and flow channel, which would otherwise lead to difficulties in slag removal and low energy utilization.

[0015] The molten pool in the utility model can also continuously blow in air when treating non-metal solid waste, on the one hand, the non-metal solid waste is effectively incinerated in the molten pool, and energy is released to reduce the energy required for self-treatment, on the other hand, the blown-in air can form stirring inside the molten pool, so that the temperature inside the molten pool is more uniform. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0017] Fig. 1 It is the front view internal plane structure schematic diagram of the utility model;

[0018] Fig. 2 It is the side view internal plane structure schematic diagram of the utility model;

[0019] Fig. 3 It is the top view internal plane structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] In order to make the personnel in the technical field better understand the scheme of the application, the technical scheme in the embodiment of the application will be clearly and completely described below in combination with the drawings in the embodiment of the application, obviously, the described embodiment is only a part of the embodiment of the application, not all the embodiments. Based on the embodiment in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the application.

[0021] It should be noted that, in the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other. The application will be described in detail below with reference to the accompanying drawings Figs. 1-3 and in combination with the embodiments. Embodiment 1

[0022] Embodiment 1 discloses a plasma and slag ohmic integrated heating melting furnace, which comprises a furnace body 1 and a furnace cover 2, the inside of the furnace body 1 is surrounded by refractory material to form two mirror image symmetrical molten pools 3, and an electrode 4 capable of generating electric arc plasma is arranged on the furnace cover 2 above each molten pool 3. A metal discharge port 301 is arranged at the bottom of each of the two molten pools 3, and a bottom electrode 5 is arranged at the bottom of each of the two molten pools 3, and the two bottom electrodes 5 are connected with a switch 6 through wires, so that the two bottom electrodes 5 can form a loop after the switch 6 is closed.

[0023] Two molten pools 3 are separated by a partition wall 7, and a molten pool connecting passage 8 is formed at the lower end of the partition wall 7 to connect the bottoms of the two molten pools 3. A feeding port 9 is arranged at the upper end of the side of the furnace body 1 and is centrally located above the partition wall 7, and a distribution block 10 is further arranged at the top end of the partition wall 7, so that the solid waste fed from the feeding port 9 can be evenly distributed into the two molten pools 3 under the action of the distribution block 10.

[0024] A flow passage 11 is arranged in the furnace body 1 opposite the feeding port 9 to connect the upper ends of the two molten pools 3, and the cross section of the flow passage 11 is designed in a U shape. Specifically, the flow passage 11 is designed in a long strip shape, and the two sides thereof are separated by a refractory partition wall 12 to form a U shape. A molten material discharge port 111 is arranged at the bottom of the turning position of the flow passage 11, and a plug 13 is arranged in the furnace cover 2 above the molten material discharge port 111 to move up and down to block or open the molten material discharge port 111. In this embodiment 1, the turning position of the flow passage 11 can be designed in a U shape or a semicircle, and the molten material discharge port 111 is arranged at the middle position thereof.

[0025] In addition, a baffle 14 made of refractory material is arranged at the position where the flow passage 11 is connected to the upper end of the molten pool 3, the upper end of the baffle 14 is connected to the furnace cover 2, and the lower end thereof is kept a certain height from the bottom wall of the flow passage 11. The baffle 14 can intercept the un-melted solid waste at the upper layer of the molten pool 3 and prevent the solid waste from being directly discharged from the molten material discharge port 111 without treatment. Meanwhile, a flue gas flow hole is arranged at the upper end of the baffle 14 to enable the flue gas above the molten pool 3 to enter the upper part of the flow passage 11.

[0026] In this embodiment 1, a gas blowing port 15 is arranged on the side of the furnace body 1 below the flow passage 11 and is connected to the molten pool 3, and the gas blowing port 15 is located at about 1 / 2 of the depth of the molten pool 3. Air is continuously input into the molten pool 3 through the gas blowing port 15 to play a role in stirring the molten pool and oxidizing a small amount of organic matter. Meanwhile, a flue gas discharge port 16 is arranged on the furnace cover 2 to enable the flue gas generated during the melting process to be directionally discharged and then discharged after being treated by subsequent flue gas treatment equipment.

[0027] Finally, a cooling water jacket 17 is arranged around the two electrodes 4 generating electric arc plasma in this embodiment 1, and cooling water is continuously input into the cooling water jacket 17 to cool the electrodes 4 when the electrodes 4 are operated for a long time, so as to avoid high-temperature and high-load operation of the electrodes 4 and improve the service life of the electrodes 4.

[0028] The specific operation steps and working principle of the plasma and slag ohmic integrated heating melting furnace of the present embodiment 1 are as follows:

[0029] First, the bottom of the two molten pools 3 is paved with steel plates, scrap iron or coke and other easily conductive materials to cover the bottom electrodes 5, and then the switch 6 is closed to make the circuit of the two bottom electrodes 5 connected to form a loop. Then the two electrodes 4 generating electric arc plasma are pushed down to make them contact with the conductive materials paved on the bottom of the molten pool 3, and then the power supply of the electrodes 4 is turned on, and then the two electrodes 4 are slowly lifted up to form a plasma arc, thereby heating the conductive materials at the bottom of the molten pool 3 to melt them to form molten liquid. Finally, the switch 6 is turned off to disconnect the circuit of the bottom electrodes 5, and the molten liquid in the two molten pools is connected through the connecting channel 8 to make the current of the molten liquid in the two molten pools connected.

[0030] Then, the solid waste is put into the furnace body through the feed port 9 and is evenly distributed into the two molten pools under the action of the distribution block 10, and then is melted by the heat energy generated by the generated plasma arc, and the generated flue gas is discharged from the flue gas discharge port 16 and connected to the subsequent flue gas treatment equipment for treatment, and the molten material stays in the molten pool 3. At the same time, when the solid waste is being treated, air can be continuously introduced into the molten pool 3 through the air inlet 15 to stir the molten material in the molten pool and also to oxidize a small amount of organic matter.

[0031] When the liquid level of the molten material rises and enters the flow channel 11, the molten material will completely cover the flow channel 11 and come into contact with the two electrodes 4 to form a loop, and then the solid waste is first rapidly melted by the generated plasma arc, and then is continuously heated and kept warm by the Joule heat in the loop. When the amount of molten material in the flow channel 11 reaches a certain amount, the molten material discharge port 111 is opened to let the molten material flow out of the furnace body.

[0032] As the running time goes on, the metal layer in the molten pool 3 will slowly rise, thereby squeezing the capacity of the molten pool and reducing the processing capacity. At this time, the electrode 4 can be first lowered to contact the bottom of the molten pool 3, and then the electrode 4 is slowly lifted up, and the voltage change of the electrode 4 is observed, and then the depth of the metal layer is calculated in combination with the lifting speed. When the depth of the metal layer reaches a preset value (such as more than 1 / 2 of the depth of the molten pool), the metal discharge port 301 is opened to discharge the metal layer in the molten pool 3, and when the metal layer is basically emptied, the metal discharge port 301 is re-plugged.

[0033] Finally, when a sudden situation occurs and it is determined that it cannot be solved in a short time, the feeding is immediately stopped, and the metal discharge port 301 is immediately opened to quickly discharge all the molten material in the molten pool, so as to prevent affecting the next start-up of the furnace.

[0034] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A plasma and slag ohmic integrated heating and melting furnace, comprising a furnace body and a furnace cover, characterized in that, The furnace body is divided into two molten pools by a partition wall. The lower end of the partition wall is provided with a molten pool connection channel for connecting the two molten pools. The furnace body above the partition wall is provided with a feed port. The bottom of each of the two molten pools is provided with a metal discharge port and a bottom electrode. The two bottom electrodes are connected by a switch through a wire. The furnace cover directly above the two molten pools is provided with an electrode for generating electric arc plasma. The upper end of the furnace body is provided with a flow channel, and the two ends of the flow channel are connected to the upper ends of two molten pools. A molten material outlet is provided at the bottom of the flow channel, and a plug is provided in the molten material outlet. A baffle is provided at the position where the flow channel is connected to the molten pool, and the upper end of the baffle is connected to the furnace cover, and the lower end is reserved at a certain distance from the bottom wall of the flow channel.

2. The plasma and slag ohmic integrated heating and melting furnace according to claim 1, characterized in that, The flow channel is elongated and separated into two sides by a refractory partition wall. The molten material outlet is located at the turning point of the flow channel.

3. The plasma and slag ohmic integrated heating and melting furnace according to claim 2, characterized in that, The flow channel is configured in a U-shape or semi-circle at its turning point, and the melt outlet is located in the middle of the flow channel at its turning point.

4. The plasma and slag ohmic integrated heating and melting furnace according to claim 1, characterized in that, The side of the furnace body is provided with an air vent that communicates with the molten pool.

5. The plasma and slag ohmic integrated heating and melting furnace according to claim 1, characterized in that, The furnace cover is equipped with a flue gas exhaust port.

6. The plasma and slag ohmic integrated heating and melting furnace according to claim 1, characterized in that, The feed inlet is centrally located directly above the partition wall, and the top of the partition wall is equipped with a guide block to evenly distribute the material fed into the feed inlet.

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