Method for reducing yellow smoke emission of ferromolybdenum smelting furnace

Abstract

Compared with the prior art, the method for reducing the yellow smoke discharge amount of the ferromolybdenum smelting furnace has the following beneficial effects that by arranging the reaction layer, urea in the reaction layer can react with nitric oxide generated in the ferromolybdenum smelting process to generate carbon dioxide, water and nitrogen in the ferromolybdenum smelting process; according to the mode, the nitrogen oxides can be effectively removed, the investment cost of waste gas treatment is reduced, and the economic benefit is improved, and the method comprises the steps that firstly, a reaction layer is arranged above a quartz sand layer at the bottom of the ferromolybdenum smelting furnace, and composition materials of the reaction layer comprise urea; step 2, placing a raw material for smelting ferromolybdenum above the reaction layer, wherein the weight ratio of the urea to the raw material for smelting ferromolybdenum is 1: (500-530); and 3, combustion-supporting air is pumped into the upper layer of the ferromolybdenum smelting furnace to heat the ferromolybdenum smelting furnace, the air flows from top to bottom, and the yellow smoke flows through the reaction layer from top to bottom along with airflow flowing.

Description

Technical Field

[0001] The invention relates to the technical field of molybdenum-ferro-smelting waste gas treatment, and in particular to a method for reducing the emission of yellow smoke from a molybdenum-ferro-smelting furnace. Background Art

[0002] During the smelting process of alloy ferromolybdenum, nitrogen oxides will be produced at high temperatures. When the raw materials for ferromolybdenum smelting contain trace amounts of sulfur, sulfur dioxide gas will be generated at high temperatures. The color of nitrogen oxides is reddish brown, and the color of sulfur dioxide is yellow, so the exhaust gas is yellow-brown.

[0003] In order to ensure environmental protection, at present, the molybdenum iron smelting field adopts centralized treatment of waste gas to achieve the effect of removing pollutants in the waste gas. This treatment method can achieve a good treatment effect on the waste gas. However, this method of waste gas treatment requires expensive large-scale gas treatment equipment, the gas treatment equipment has a complex treatment process and high use cost. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problem and provide a method for reducing the yellow smoke emission of a ferromolybdenum ferromolybdenum furnace by treating the yellow smoke during the ferromolybdenum ... furnace.

[0005] To achieve the above object, the technical solution of the present invention is: a method for reducing the yellow smoke emission of a molybdenum-making ferro-furnace, comprising the following steps: Step 1, a reaction layer is arranged above the quartz sand layer at the bottom of the molybdenum iron smelting furnace, wherein the component materials of the reaction layer include urea; Step 2: placing raw materials for ferromolybdenum smelting on the reaction layer, wherein the weight ratio of urea to the raw materials for ferromolybdenum smelting is 1: (500-530); Step 3: Pump combustion-supporting air into the upper layer of the ferromolybdenum smelting furnace to heat the ferromolybdenum smelting furnace. The air flows from top to bottom, and the yellow smoke flows from top to bottom through the reaction layer along with the air flow.

[0006] Furthermore, the weight ratio of urea to ferromolybdenum smelting raw materials is 1:515.

[0007] Furthermore, the constituent materials of the reaction layer also include silicon powder, and the weight ratio of silicon powder to ferromolybdenum smelting raw materials is 1: (4000-5000).

[0008] Furthermore, it also includes: Collect the exhaust gas from the molybdenum iron smelting furnace; A treatment agent is sprayed on the exhaust gas, wherein the treatment agent is a urea solution or urea particles.

[0009] Furthermore, a processing device is included, the processing device comprising: A collection unit, including a suction assembly and a spray assembly; A guide rail, arranged horizontally and passing through the negative pressure suction member; The guide movement of the molybdenum iron smelting furnace is arranged on the guide rail.

[0010] Furthermore, the suction assembly includes two groups of suction pipes arranged on both sides of the guide rail and a chimney connected to the other end of the suction pipe, and the spray assembly is arranged on the chimney.

[0011] Furthermore, the spray assembly comprises: A conveying ring pipe is arranged inside the chimney and coaxially with the chimney; The spray heads include a plurality of spray heads which are arranged at intervals around the axis of the chimney, the lower ends of which are connected to the conveying ring pipe, and the spraying directions of the spray heads intersect with the axis of the chimney.

[0012] Furthermore, the spray assembly also includes: The annular shielding surface is located inside the conveying ring pipe and is coaxially arranged with the chimney, and the lower end thereof is connected with the inner circumference of the chimney.

[0013] Furthermore, the molybdenum iron smelting furnace includes a base, a cavity is arranged in the base, a through hole is arranged on the side wall of the cavity, the cavity is filled with a quartz sand layer, and the upper surface of the quartz sand layer is lower than the upper surface of the base and higher than the through hole.

[0014] Furthermore, the molybdenum-iron smelting furnace also includes a cylinder body arranged above the base, and the cylinder body is detachably connected to the base.

[0015] Compared with the prior art, the method for reducing yellow smoke emission of a molybdenum-iron smelting furnace disclosed in the present invention has the following beneficial effects: by setting a reaction layer, urea in the reaction layer can react with nitrogen oxides generated in the molybdenum-iron smelting process to generate carbon dioxide, water and nitrogen, thereby achieving the effect of reducing nitrogen oxide emission. In this way, the purpose of effectively removing nitrogen oxides can be achieved, the investment cost of waste gas treatment can be reduced, and the economic benefit can be improved. The method comprises: step 1, setting a reaction layer above the quartz sand layer at the bottom of the molybdenum-iron smelting furnace, wherein the component materials of the reaction layer include urea; step 2, placing raw materials for molybdenum-iron smelting above the reaction layer, wherein the weight ratio of urea to the raw materials for molybdenum-iron smelting is 1: (500-530); step 3, pumping combustion-supporting air into the upper layer of the molybdenum-iron smelting furnace to heat the molybdenum-iron smelting furnace, the air flows from top to bottom, and the yellow smoke flows from top to bottom through the reaction layer with the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flow chart of a method for reducing yellow smoke emission from a molybdenum-ferrometallurgical furnace.

[0017] Figure 2The present invention is a schematic diagram of the structure of a processing device and a molybdenum-ferrometallurgical furnace in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0018] Figure 3 The present invention is a schematic diagram of the overall structure of a processing device in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0019] Figure 4 The present invention is a schematic diagram of the structure of a suction pipe in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0020] Figure 5 The present invention is a schematic structural diagram of a ferromolybdenum smelting furnace in a method for reducing yellow smoke emissions from a ferromolybdenum smelting furnace.

[0021] Figure 6 The present invention is a schematic diagram of the internal structure of a molybdenum-ferrometallurgical furnace base in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0022] Figure 7 The present invention is a schematic diagram of the side structure of a processing device in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0023] Figure 8 for Figure 2 The diagram shows a partially enlarged structural diagram of point A in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace according to the present invention.

[0024] Fig. 9 for Figure 7 The schematic diagram of the cross-sectional structure at BB in the method for reducing the yellow smoke emission of a molybdenum-ferrometallurgical furnace of the present invention is shown.

[0025] Fig.10 The present invention is a schematic diagram of the cross-sectional structure of a water storage tank and a conveying ring pipe in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0026] Fig.11 The invention discloses an enlarged structural schematic diagram of a water storage tank and a conveying ring pipe in a method for reducing yellow smoke emission of a molybdenum-ferrometallurgical furnace.

[0027] Fig.12 The present invention is a schematic diagram of the top view of the structure of a water storage tank and a conveying ring pipe in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0028] Fig.13 The present invention is a schematic diagram of the upward structural view of a water storage tank and a conveying ring pipe in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0029] Fig.14 The present invention is a schematic diagram of the structure of a conveying ring pipe in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0030] Fig.15The present invention is a schematic diagram of the side structure of a water inlet valve and a first control valve in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0031] Fig.16 The present invention is a schematic diagram of the cross-sectional structure of a water inlet valve and a first control valve in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace.

[0032] Fig.17 for Fig.10 The figure shows a schematic diagram of the partial enlarged structure of the second control valve at position D in a method for reducing yellow smoke emissions from a molybdenum-ferrometallurgical furnace according to the present invention.

[0033] In the figure: 1, collecting unit; 11, suction assembly; 110, suction pipe; 1101, suction hole; 111, suction main pipe; 113, chimney; 12, spray assembly; 120, sink; 1201, 121, conveying ring pipe; 1200, ring groove; 1201, annular shielding surface; 1202, bottom; 1203, first ring plate; 1204, second ring plate; 122, nozzle; 123, water storage tank; 1230, connecting hole; 1231, overflow pipe; 1232, connecting pipe; 124, collecting funnel; 125, supply pipe; 126, liquid pump; 127, liquid distribution tank; 128, second control valve; 1281, connecting cylinder; 1282, bottom cylinder; 12821, first partition plate; 1283, annular cylinder; 1284, hollow valve stem; 12840, second communicating hole; 12841, annular groove; 1285, piston plate; 1286, connecting rod; 1287, first heat conducting plate; 1288, second compression spring; 129, first control valve; 1290, second valve member; 1291, second heat conducting plate; 1292, cylinder; 1293, second partition plate; 12931, drain port; 1294, guide rod; 1295, first compression spring; 1296, counterweight; 1297, third partition plate; 1298, second guide rod; 1299, second piston; 2. Guide rails; 3. Base; 31. Receptacle; 32. Through hole; 33. Cylinder; 5. Liquid level valve; 50. Valve body; 501. Valve cavity; 502. Water outlet; 503. Communication cavity; 504. Communication liquid channel; 51. Valve stem; 510. First valve member; 52. Pin shaft; 53. Rigid rod; 530. Float; 6. Quartz sand layer; 7. Reaction layer; 8. Silica powder layer. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0035] Please refer to Figure 1 The technical solution of the present invention is: a method for reducing the yellow smoke emission of a molybdenum-making ferro-furnace, comprising the following steps: Step 1, a reaction layer is arranged above the quartz sand layer at the bottom of the molybdenum iron smelting furnace, wherein the component materials of the reaction layer include urea; Step 2: placing raw materials for ferromolybdenum smelting on the reaction layer, wherein the weight ratio of urea to the raw materials for ferromolybdenum smelting is 1: (500-530); Step 3: Pump combustion-supporting air into the upper layer of the ferromolybdenum smelting furnace to heat the ferromolybdenum smelting furnace. The air flows from top to bottom, and the yellow smoke flows from top to bottom through the reaction layer along with the air flow.

[0036] Specifically, as an implementation method, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 The molybdenum iron smelting furnace includes a base 3 and a cylinder 33. A cavity 31 is arranged in the base 3. A through hole 32 is arranged on the side wall of the cavity. A quartz sand layer is arranged in the cavity. The cylinder 33 is arranged above the base. The quartz sand layer is air-permeable. During operation, a reaction layer 7 is evenly laid on the quartz sand layer 6. The material composition of the reaction layer includes urea. Then, raw materials for refining alloy molybdenum iron are arranged in the cylinder. The top of the cylinder is closed. Air is pumped into the upper part or the upper side wall of the cylinder to burn the fuel, thereby heating the molybdenum iron smelting furnace. During the heating process, the temperature in the molybdenum iron smelting furnace rises, and the nitrogen in the pumped air produces nitrogen oxides at high temperature, and the raw materials inside The sulfur impurities react with air when heated to generate sulfur dioxide. The pumped air can flow from top to bottom, thereby driving nitrogen oxides and sulfur dioxide to flow downward, and then pass through the reaction layer 7 below, and react with urea in the reaction layer at high temperature. The chemical formula of urea is CH4N20 or CO(NH2)2. At high temperature, urea can react with nitrogen oxides to generate carbon dioxide, water and nitrogen, thereby achieving the purpose of removing nitrogen oxides. In a specific implementation manner, the weight of each furnace of ferromolybdenum is 4-5 tons, and the amount of urea used in each furnace is 8 kg-10 kg. Through this ratio, the nitrogen oxides generated in the process of ferromolybdenum smelting can be effectively removed.

[0037] Furthermore, as a preferred embodiment, the weight ratio of urea to ferromolybdenum smelting raw materials is 1:515.

[0038] Further, as a specific implementation, the constituent materials of the reaction layer also include silicon powder, and the weight ratio of silicon powder to ferromolybdenum smelting raw materials is 1: (4000-5000). Specifically, by arranging the silicon powder layer 8 above the urea layer, the silicon powder has good reducibility, can achieve the effects of deoxidation, improving the strength and hardness of ferromolybdenum, serving as an alloying agent, and improving the quality and recovery rate of ferromolybdenum.

[0039] Further, as a specific implementation method, by setting a reaction layer above the quartz sand layer, the urea in the reaction layer can remove most of the nitrogen oxides generated in the ferromolybdenum smelting process. In order to further ensure the removal effect of nitrogen oxides, the following steps are also included: Collect the exhaust gas from the molybdenum iron smelting furnace; spray the exhaust gas with a treatment agent, which is a urea solution or urea particles. Specifically, the gas discharged during the molybdenum iron smelting process of the molybdenum iron smelting furnace is sucked and collected, and the collected gas has a very high temperature, which can reach about 1000 degrees Celsius. By spraying urea solution into the collected exhaust gas, the urea in the urea solution can further react with the residual nitrogen oxides in the exhaust gas at high temperature, and further remove the nitrogen oxides in the exhaust gas. The urea in the urea solution can react with a small amount of sulfur dioxide in the exhaust gas to generate sulfur amidine, which can achieve a certain desulfurization effect. The urea solution is a solution of urea and water, and the concentration of the urea solution is about 25%; the urea particles are to crush the urea into urea powder, and the particle size of the urea particles is 0.05 mm-0.1. The urea particles are sprayed in a way that the small particles of urea volatilize at high temperature and react with the nitrogen oxides in the exhaust gas to achieve the purpose of removing nitrogen oxides.

[0040] Further, as a preferred embodiment, in the actual application process, the battlefield adopts spraying urea solution into the exhaust gas to treat the exhaust gas. As a specific embodiment, refer to Figure 2-Figure 4 , the present application also includes a processing device, the processing device comprising: The collection unit 1 includes a suction component 11 and a spray component 12; A guide rail 2, arranged horizontally and passing through the negative pressure suction member 11; The guide movement of the molybdenum-iron smelting furnace is arranged on the guide rail 2 .

[0041] Specifically, the guide rail 2 is arranged in the horizontal direction, and the base of the molybdenum-iron smelting furnace is provided with wheels that cooperate with the guide rail 2 so that it can move on the guide rail. The present application arranges a suction component 11 in the guide direction of the guide rail. When the reaction layer and molybdenum-iron smelting raw materials are set in the molybdenum-iron smelting furnace, the molybdenum-iron smelting furnace can be moved to a position convenient for operation. During the process of molybdenum-iron smelting in the molybdenum-iron smelting furnace, it is moved to the suction component 11, and the exhaust gas discharged from the molybdenum-iron smelting furnace is sucked and collected by the suction component 11, and then the urea solution is sprayed into the sucked and collected exhaust gas through the spray unit 12 to treat the nitrogen oxides in the exhaust gas, thereby improving the effect of removing pollutants in the exhaust gas.

[0042] Further, as a preferred embodiment, refer to Figure 3 , Figure 4 The specific structure of the suction component 11 is as follows: the suction component 11 includes two groups of suction pipes 110 arranged on both sides of the guide rail 2 and a chimney 113 connected to the other end of the suction pipe 110, and the spray component 12 is arranged on the chimney 113.

[0043] Specifically, the suction assembly includes two groups of suction pipes 110 arranged on both sides of the guide rail 2, each group of suction pipes 110 includes two parallel and spaced apart, and the two groups of suction pipes 110 are connected to the inside of the chimney 113 through the suction main pipe 111. In the specific use process, there is a pressure difference at both ends of the chimney 113, and an airflow from bottom to top can be generated in the chimney. The end of the suction main pipe 111 can be connected to the middle area or the bottom of the chimney 113, so that a suction effect can be provided in the suction main pipe, so that the suction A negative pressure effect is generated in the tube 110, and a suction hole 1101 is provided on one side of the suction tube 110 close to the guide rail, and the negative pressure exhaust gas is sucked through the suction hole 1101; in some embodiments, an exhaust fan can also be provided on the suction main pipe 111, and the exhaust fan is used to provide negative pressure suction force for the suction tube 110, and the exhaust gas is discharged into the chimney 113. After the exhaust gas is discharged into the chimney, it can move from bottom to top, wherein the spray assembly 12 is arranged on the chimney 113 and is located above the suction main pipe 111.

[0044] Further, as a specific implementation, the specific structure of the spray assembly 12 is as follows: Figure 3 , Figure 7 , Figure 9-14 , the spray assembly 12 comprises: The conveying ring pipe 121 is arranged inside the chimney 113 and coaxially arranged with the chimney 113; The spray heads 122 include a plurality of spray heads 122 spaced apart around the axis of the chimney 113 , the lower ends of which are connected to the conveying ring tube 121 , and the spraying direction of the spray heads intersects with the axis of the chimney 113 .

[0045] Specifically, the spray assembly includes a conveying ring pipe 121 arranged inside the chimney, the conveying ring pipe is connected to a supply pipe 125, and a plurality of spray heads 122 are arranged on the conveying ring pipe 121, wherein the upper end of the spray head is inclined toward the axis of the chimney, so that the solution sprayed from the spray head can be sprayed upward and toward the central area of ​​the chimney, and can fully contact with the exhaust gas from the chimney from bottom to top. The end of the supply pipe 125 extends through the side wall of the chimney 113. The spray unit also includes a liquid pump 126 and a liquid distribution tank 127. The liquid distribution tank 127 is used to configure a fertilizer solution of a predetermined concentration. When working, the liquid pump 126 works to pump the solution in the liquid distribution tank to the conveying ring pipe 121, and the solution is sprayed from the spray head 122 to achieve a spraying effect.

[0046] Further, it can be understood that, since the exhaust gas has a high temperature and carries soot impurities inside, the direct contact between the spray head and the high-temperature exhaust gas inside the chimney will reduce the service life of the spray head and the conveying ring pipe 121, and the spray head and the conveying ring pipe 121 are not easy to replace when they are arranged inside the chimney. In order to increase the service life of the spray head, as a preferred embodiment, reference is made to Fig.10 , Fig.11 , the spray assembly 12 also includes: The annular shielding surface 1201 is located inside the conveying ring tube 121 and is coaxially arranged with the chimney 113, and the lower end thereof is connected to the inner circumference of the chimney.

[0047] Specifically, it also includes an annular water trough 120, wherein the water trough 120 includes a first ring plate 1203 and a second ring plate 1204 that are coaxially and spaced apart, and a bottom 1202 that is connected to the lower ends of the first ring plate and the second ring plate, thereby forming an annular groove 1200 between the first ring plate, the second ring plate and the bottom 1202, wherein the second ring plate 1204 is connected to the inner wall of the chimney, the conveying ring pipe 121 is arranged inside the annular groove 1200, the supply pipe 125 passes through the second ring plate and the side wall of the chimney and extends out of the chimney, and the annular shielding surface 1201 is the inner circumferential surface of the first ring plate 1203. Through this arrangement, when the exhaust gas rises from bottom to top, the shielding surface 1201 can isolate the sprinkler head and the high-temperature exhaust gas, thereby reducing the probability of contact between the exhaust gas and the conveying ring pipe 121 and the sprinkler head, thereby achieving the effect of increasing the service life of the conveying ring pipe 121 and the sprinkler head.

[0048] As a preferred embodiment, refer to Fig. 9 The upper end of the first ring plate 1203 is higher than the upper end of the shower head, thereby achieving a better protection effect.

[0049] Further, it can be understood that the urea solution is sprayed through the spray head. When the chimney stops discharging exhaust gas, the spray head stops spraying the urea solution. At this time, urea solution will remain in the spray head and the conveying ring pipe 121, and there is residual temperature in the chimney 113, so the residual solution will be evaporated, and the steam will be discharged from the mouth of the spray head. When the steam is discharged, it will drive the residual urea solution remaining in the spray head and the conveying ring pipe 121 to flow out, so that the urea solution evaporates at the mouth of the spray head, and the urea remains at the mouth of the spray head, so that the mouth of the spray head is blocked. In order to reduce the risk of the spray head being blocked, as a preferred embodiment, reference is made to Figure 8 , Fig. 9 , Fig.12 , and also includes a water tank 123 arranged on the chimney 113, and a liquid level valve 5 is arranged in the annular groove 1200, and the liquid level valve 5 is connected with the water tank 123 through a connecting pipe 1232, wherein the height of the water tank 123 is higher than the annular groove. Through this arrangement, clean water can be accumulated in the water tank 123, and the clean water can be supplied to the annular groove 1200 through the connecting pipe 1232. When the clean water in the annular groove 1200 floods the upper end of the sprinkler head, the liquid level valve 5 can be switched to a closed state, and the connecting pipe 1232 is cut off at this time. Through this arrangement, clean water can be arranged in the annular groove 1200. When the sprinkler head stops spraying, the clean water can flood the upper end of the sprinkler head, and can dissolve and dilute the urea solution in the sprinkler head, thereby reducing the probability of urea clogging the sprinkler head mouth.

[0050] Further, as a specific implementation method, refer to Fig.13 , Figure 15-17A first control valve 129 and a second control valve 128 are provided on the bottom 1202, wherein the second control valve 128 is connected to the connecting pipe and the liquid level valve 5. The first control valve 129 can be opened when the temperature of the environment exceeds a predetermined value T to discharge the clean water in the annular groove 1200, and the second control valve 128 can be disconnected from the connecting pipe and the liquid level valve 5 when the temperature of the environment reaches a predetermined value T. Through this arrangement, when the exhaust gas is discharged, the control liquid pump 126 works to supply the conveying annular pipe 121 with Urea solution is sprayed out by the spray head. At this time, the clean water in the annular groove 1200 submerges the mouth of the spray head, and the liquid level valve 5 is in a closed state. At this time, the temperature in the chimney rises. When the temperature reaches the first predetermined value T1, the first control valve 129 opens to discharge the clean water in the annular groove 1200. When the temperature reaches the second predetermined value T2, the state of the second control valve 128 is switched to disconnect the connecting pipe 1232 and the liquid level valve 5. At this time, after the clean water in the annular groove 1200 is discharged, the liquid level in the annular groove 1200 drops. The liquid level drops to below the mouth of the spray head. At this time, the urea solution sprayed out by the spray head will not be blocked by the clean water surface, which can ensure the spraying effect of the urea solution. Among them, T1 is greater than T2. ​​When the exhaust gas is stopped, the urea solution stops spraying, and the temperature in the chimney 113 decreases. When the temperature drops below T1, the first control valve is closed. When the temperature continues to drop to T2, the second control valve state switches to the state of the connecting pipe 1232 and the liquid level valve 5. At this time, due to the low liquid level in the annular groove 1200, The liquid level valve 5 is in an open state. At this time, the water in the water tank 123 can enter the annular groove 1200 through the liquid level valve 5 to replenish the annular groove 1200. At this time, since the first control valve 129 is switched to a closed state, the clean water will not be discharged, and the liquid level in the annular groove 1200 will rise. After the liquid surface submerges the upper end of the sprinkler head, the liquid level valve 5 is switched to a closed state and the water replenishment is stopped. At this time, the clean water submerges the mouth of the sprinkler head, dissolves and dilutes the urea solution inside the sprinkler head, and reduces the risk of the sprinkler head being blocked.

[0051] As a specific implementation, the first predetermined value T1 is in the range of 100 degrees Celsius to 200 degrees Celsius, and the second predetermined value T2 is in the range of 80 degrees Celsius to 100 degrees Celsius.

[0052] Further, as a specific implementation method, refer to Fig.17The specific structure of the first control valve 129 is as follows: it includes a cylinder 1292 arranged on the bottom 1202, a first water leakage port coaxially arranged with the cylinder 1292 is arranged on the bottom 1202, a second partition 1293 and a third partition 1297 are arranged in the cylinder from top to bottom, a guide rod 1294 is vertically guided on the second partition, a counterweight 1296 is arranged at the lower end of the guide rod, and a second valve member 1290 adapted to the first water leakage port is arranged at the upper end, a first compression spring 1295 is arranged between the counterweight and the lower surface of the second partition, wherein the second valve member 1290 includes a conical sealing surface, the first water leakage port is provided with a conical second sealing surface adapted to the conical sealing surface, and the sealing surface of the second valve member can be abutted against the first water leakage port under the elastic force of the first compression spring. On the second sealing surface, the first control valve 129 is in a closed state, and a drain port 12931 is provided on the side wall of the cylinder 1292, and the drain port 12931 is located above the second partition 1293. The lower end of the cylinder is connected to the second heat conduction plate 1291, and a second piston 1299 is provided between the second heat conduction plate and the third partition. The area between the second piston and the second heat conduction plate in the cylinder is filled with a thermal expansion flow medium, and a connecting hole connected to the atmosphere is provided on the side of the third partition close to the second heat conduction plate on the cylinder, and a second guide rod 1298 is provided on the third partition coaxially with the cylinder, and the lower end of the second guide rod is connected to the second piston 1299, and an insulating layer is provided on the outer peripheral surface of the cylinder, wherein the insulating layer can be made of glass fiber and other materials. Through the above arrangement, when the temperature is lower than the first predetermined value T1, the thermal expansion flow medium filled under the third partition expands a little. At this time, the second valve member blocks the first water leakage port under the elastic force of the first compression spring. At this time, the first control valve is in a closed state, so that the water in the annular groove will not leak out from the first water leakage port. When the temperature in the chimney rises to the first predetermined value T1, the thermal expansion flow medium filled under the third partition expands, pushing the second piston to move upward, thereby pushing the second guide rod to move, and the second guide rod pushes the counterweight 1296 to move upward. Thereby, the first compression spring is squeezed to push the second valve component upward, so that the second valve component opens the first water leakage port. At this time, the water in the annular groove 1200 can be discharged from the first water leakage port, and then discharged from the drain port 12931. At this time, the first control valve is in an open state, and when the temperature in the chimney is maintained above the first predetermined value T1, the first control valve remains in an open state. When the temperature in the chimney is lower than the first predetermined value T1, the flowing medium contracts, and under the action of the elastic force of the first compression spring and the gravity of the counterweight, the second valve component covers the first water leakage port again and returns to a closed state.

[0053] Further, as a specific implementation, the specific structure of the second control valve and the liquid level valve 5 is: Fig.15 , Fig.16A second water leakage port is provided on the bottom 1202. The liquid level valve 5 includes a valve body 50 provided on the upper surface of the bottom. A valve cavity 501 and a connecting cavity 503 corresponding to the second water leakage port and a connecting liquid passage connecting the valve cavity 501 and the connecting cavity 503 are provided in the valve body. A valve stem 51, a pin 52 and a rigid rod 53 rotatably connected to the pin are provided vertically on the upper end of the valve body. One end of the rigid rod is hingedly connected to the valve stem 51. The hinged portion of the rigid rod and the valve stem is a strip hole (not shown). The length direction of the strip hole is provided along the length direction of the rigid rod. A floating ball is provided at the other end of the rigid rod 53. 530, a first valve member 510 is provided at the end of the valve stem 51 extending into the valve cavity 501. When the liquid level in the annular groove 1200 rises, the float 530 floats up, driving the end of the rigid rod 53 to move upward, causing the rigid rod 53 to deflect around the pin 52, thereby providing downward pressure on the valve stem, causing the first valve member to abut against the upper end of the connecting liquid channel 504. At this time, the liquid level valve 5 is in a closed state. When the liquid level in the annular groove 1200 decreases, the floating member moves downward under the action of gravity, driving the valve member to move upward. When the first valve member leaves the upper end of the connecting liquid channel 504, the liquid level valve 5 switches to an open state.

[0054] Further, refer to Fig.15 The second control valve 128 is arranged on the lower surface of the bottom 1202, including a connecting tube 1281 coaxially arranged with the valve body 50, a bottom tube 1282 arranged at the lower end of the connecting tube 1281, and a first heat conducting plate 1287 arranged at the lower end of the bottom tube. The outer peripheral surfaces of the connecting tube and the bottom tube are both provided with a heat insulating layer, wherein the heat insulating layer is made of glass fiber; an annular tube 1283 is coaxially arranged in the connecting tube 1281, and the middle position of the annular tube 1283 is connected to the connecting pipe 1232. A hollow valve stem 1284 is provided in the guide of the annular tube, and the hollow valve stem The lower end is sealed and connected with a connecting rod 1286, the outer peripheral surface of the middle area of ​​the hollow valve stem is provided with an annular groove 12841, the bottom of the annular groove is provided with a second connecting hole 12840 connected to the internal channel, the upper end of the bottom cylinder 1282 is provided with a first partition plate 12821, a piston plate 1285 is provided between the first partition plate and the first heat conduction plate, a connecting channel connected to the atmosphere is provided on the first partition plate, the connecting rod 1286 is cooperated with the first partition plate guide, the connecting rod is connected to the piston plate 1285, and the space between the piston plate and the first heat conduction plate is filled with a thermal expansion flow medium.

[0055] refer to Fig.16When the ambient temperature inside the chimney where the first control valve is located is lower than the second predetermined value T2, the expansion amount of the heat-expanding flow medium is small or does not expand. At this time, the lower end of the hollow valve stem is pressed against the first partition plate 12821 under the elastic force of the second compression spring 1288. At this time, the annular groove 12841 is correspondingly connected with the connecting pipe 1232. At this time, the water in the connecting pipe can flow to the connecting cavity 503 through the hollow valve stem. At this time, when the liquid level valve is opened, the water in the connecting pipe can flow out through the water outlet 502 on the valve body; when the ambient temperature rises to the second predetermined value T2, the heat-expanding flow medium expands, pushing the piston plate 1285 to move upward, so that the annular groove 12841 and the connecting pipe 1232 are staggered, and the annular groove is blocked by the inner side wall of the annular cylinder. At this time, the connecting pipe cannot be connected with the annular groove, and the water in the annular groove connecting pipe cannot flow to the liquid level valve 5. Further, as a preferred embodiment, refer to Figure 8 A collecting funnel 124 is provided on the top of the water tank 123, and a connecting hole 1230 is provided on the top of the water tank 123. The collecting funnel 124 can collect rainwater, and the collected rainwater can flow into the water tank 123 from the connecting hole 1230 to achieve the purpose of water storage, thereby effectively utilizing rainwater. An overflow pipe 1231 can also be provided on the top of the water tank 123. By providing the overflow pipe 1231, water can overflow through the overflow pipe 1231 when the water in the water tank 123 is full.

[0056] Further, as a specific implementation method, refer to Figure 5 , Figure 6 The molybdenum iron smelting furnace includes a base 3, a cavity 31 is arranged in the base, a through hole 32 is arranged on the side wall of the cavity 31, and the cavity is filled with a quartz sand layer, and the upper surface of the quartz sand layer is lower than the upper surface of the base 3 and higher than the through hole.

[0057] Furthermore, as a specific implementation, the molybdenum iron smelting furnace includes a base 3 and a cylinder 33 arranged above the base. The cylinder 33 is detachably connected to the base 3. Through this arrangement, it is convenient to disassemble the cylinder and the base and then set the reaction layer.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for reducing the yellow smoke emission of a ferromolybdenum smelting furnace, comprising the following steps: Step 1, a reaction layer is arranged above the quartz sand layer at the bottom of the molybdenum iron smelting furnace, wherein the component materials of the reaction layer include urea; Step 2: placing raw materials for ferromolybdenum smelting on the reaction layer, wherein the weight ratio of urea to the raw materials for ferromolybdenum smelting is 1: (500-530); Step 3: Pump combustion-supporting air into the upper layer of the ferromolybdenum smelting furnace to heat the ferromolybdenum smelting furnace. The air flows from top to bottom, and the yellow smoke flows from top to bottom through the reaction layer along with the air flow.

2. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 1, characterized in that: The weight ratio of urea to ferromolybdenum smelting raw materials is 1:

515.

3. The method for reducing yellow smoke emission of a molybdenum ferrometallurgical furnace according to claim 1, characterized in that: The constituent materials of the reaction layer also include silicon powder, and the weight ratio of silicon powder to ferromolybdenum smelting raw materials is 1: (4000-5000).

4. The method for reducing yellow smoke emission of a molybdenum ferrometallurgical furnace according to claim 1, characterized in that: Also includes: Collect the exhaust gas from the molybdenum iron smelting furnace; A treatment agent is sprayed on the exhaust gas, wherein the treatment agent is a urea solution or urea particles.

5. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 4, characterized in that: A processing device is provided, the processing device comprising: A collection unit (1) comprises a suction component (11) and a spray component (12); A guide rail (2) arranged horizontally and passing through the suction assembly (11); The guide movement of the molybdenum-ferrometallurgical furnace is arranged on the guide rail (2).

6. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 4, characterized in that: The suction assembly (11) comprises two groups of suction pipes (110) arranged on both sides of the guide rail (2) and a chimney (113) connected to the other end of the suction pipe (110), and the spray assembly (12) is arranged on the chimney (113).

7. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 6, characterized in that: The spray assembly (12) comprises: A conveying ring pipe (121) is arranged inside the chimney (113) and coaxially arranged with the chimney (113); The spray heads (122) include a plurality of spray heads (122) arranged at intervals around the axis of the chimney (113), the lower end of which is connected to the conveying ring pipe (121), and the spraying direction of the spray heads intersects with the axis of the chimney (113).

8. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 7, characterized in that: The spray assembly (12) further comprises: The annular shielding surface (1201) is located inside the conveying ring tube (121) and is coaxially arranged with the chimney (113), and the lower end portion is connected to the inner circumferential surface of the chimney.

9. The method for reducing yellow smoke emission of a molybdenum ferrometallurgical furnace according to claim 1, characterized in that: The molybdenum iron smelting furnace comprises a base (3), a cavity (31) is arranged in the base, a through hole (32) is arranged through the side wall of the cavity (31), the cavity is filled with a quartz sand layer, and the upper surface of the quartz sand layer is lower than the upper surface of the base (3) and higher than the through hole.

10. A method for reducing yellow smoke emissions from a molybdenum ferrometallurgical furnace according to claim 9, characterized in that: The molybdenum-iron smelting furnace further comprises a cylinder (33) arranged above the base, and the cylinder (33) is detachably connected to the base (3).

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