Energy-saving emission-reducing yield-increasing efficiency-improving precise oxygen-increasing combustion-supporting system for rotary kiln

Abstract

The application discloses an energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for a rotary kiln, which comprises a mounting hole arranged on a rotary kiln head cover, a rotary kiln oxygen-enriched nozzle penetrating through the hole, and four lifting rings uniformly distributed on the outer periphery of the nozzle body outside the hole, wherein two symmetrical lifting rings are adjusting lifting rings for adjusting the angle of the rotary kiln oxygen-enriched nozzle, and the other two lifting rings are fixing lifting rings for fixing the rotary kiln oxygen-enriched nozzle; the nozzle body can rotate along the central axis of the nozzle body through a hose joint, the adjusting lifting rings and a hook joint, the rotary kiln oxygen-enriched nozzle can be adjusted at any time without stopping the oxygen-enriched equipment when the rotary kiln oxygen-enriched nozzle is bent due to high temperature or gravity, the oxygen can be accurately delivered to the required position of the product at all times, the rotary kiln oxygen-enriched nozzle does not need to be replaced for multiple times by stopping the equipment, the service life of the rotary kiln oxygen-enriched nozzle is obviously prolonged, the application is more practical, and the effects of energy saving, emission reduction, yield increase and efficiency improvement are better.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotary kiln in the steel, non-ferrous, ore dressing, cement, environmental protection and other industries, and particularly relates to an energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing and combustion-supporting system for a rotary kiln, which is suitable for comprehensive energy-saving, emission-reducing, yield-increasing and efficiency-improving of various rotary kilns such as cement (components include lime, phosphate fertilizer, barium sulfide, barium carbonate, titanium white [yellow] powder, nickel iron [smelting], barite, specularite, ilmenite, tin middling, magnetized roasting ore, bauxite, vanadium-titanium ore, lateritic nickel ore, manganese ore, molybdenum concentrate, carbonaceous gold ore, pesticide waste salt, manganese-containing slag, ceramsite, pellet, hazardous waste incineration, waste leather, waste tire, calcined coke, needle coke [carbon, dolomite, iron ore, oolitic hematite, bauxite, magnesia material] calcination, stone heating, copper anode slime, zinc leaching residue, solidified material, kaolin, noble metal, [hydrogen] aluminum oxide and chromium hydroxide, etc.) rotary kiln and the like. BACKGROUND

[0002] At present, the general rotary kiln adopts ordinary air combustion support or overall oxygen-increasing combustion support. The former only contains less than 21% oxygen in the air, and the rest is inert gas, which not only does not participate in combustion support, but also absorbs a large amount of heat, thereby reducing the performance and efficiency of the rotary kiln. The latter generally has a very large investment, and has many side effects such as a significant decrease in furnace life, a significant increase in NOx emission, etc. X

[0003] CN202111511698.X patent document discloses a fuel furnace kiln energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing and precise combustion-supporting method and system. Involving rotary kiln aspects: specifically composed of an oxygen source, two mixed pressure stabilizing tanks, a high-temperature regulating valve, two high-temperature gas extractors, two rotary kiln fans, an oxygen-enriched control valve and an oxygen-enriched nozzle. One of the high-temperature gas extractors, one of the mixed pressure stabilizing tanks, one of the high-temperature regulating valves, one of the rotary kiln fans, one of the oxygen-enriched control valves and one of the oxygen-enriched nozzles form a subsystem. High-temperature secondary air is extracted from the rotary kiln head cover and mixed with oxygen to form about 600℃ oxygen-enriched air, which is sent to the part of the product in the rotary kiln that needs the most oxygen through the oxygen-enriched nozzle; between the upper side of the coal injection pipe of the decomposition furnace and the C4 discharge pipe.

[0004] The existing technology has the following problems: due to the long size of the oxygen-enriched nozzle, one end of the oxygen-enriched nozzle is suspended after installation, and the temperature in the rotary kiln is very high. Under the multiple effects of its own gravity, clinker collision and sticking to the surface, the oxygen-enriched nozzle is easy to bend. At this time, the oxygen-enriched nozzle cannot accurately spray oxygen-enriched air to the part of the product in the rotary kiln that needs the most oxygen, thereby reducing the combustion support effect on the rotary kiln. SUMMARY

[0005] ​The purpose of the present application is to provide an energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting method for rotary kilns, which can solve the above-mentioned defects of the related technology of CN202111511698.X (hereinafter referred to as the original invention) and the situation not considered by the original invention, and ensure better comprehensive energy-saving, emission-reducing, yield-increasing and efficiency-improving benefits.

[0006] Because the temperature in the rotary kiln head cover is as high as about 600-1400℃, and the dust content is high, which is easy to block, the high-temperature gas extractor in the original invention is not applicable. Therefore, the high-temperature gas extractor is removed in the present application, a high-temperature gas extraction porous pipe is added to the rotary kiln, and two sets of high-temperature regulating valves and high-temperature filters are added outside the rotary kiln head to form a high-temperature gas collection device, which not only facilitates switching, but also ensures that the oxygen-rich combustion-supporting device can operate continuously and stably. A high-temperature thermometer and an oxygen-rich temperature control valve are also added outside the rotary kiln head to ensure that the oxygen-rich temperature is slowly and stably increased, while ensuring that the pipeline and rotary kiln fan are not damaged by sudden ultra-high temperature (>1000℃); secondly, the mixed pressure stabilizing tank in the original invention is removed, and a gas-gas ejector is added, which uses the gas-gas ejector to obtain relatively stable temperature, pressure and concentration of oxygen-rich gas by using high-pressure oxygen source, rotary kiln fan, and newly added oxygen-rich pressure stabilizing tank, rotary kiln flow meter, rotary kiln micro-pressure gauge and rotary kiln oxygen supply pipe temperature gauge; for the decomposition furnace, the oxygen-rich gas is preheated by high-temperature air in the tertiary air pipe and mixed into relatively stable temperature, pressure and concentration of oxygen-rich gas; because the micro-negative pressure in the tertiary air pipe is several to dozens of times higher than that in the rotary kiln head, a hole is opened in the appropriate part of the tertiary air pipe near the coal injection pipe of the decomposition furnace, and a decomposition furnace high-temperature gas collection device is welded, a decomposition furnace gas extraction main pipe on-off valve is added to the decomposition furnace high-temperature gas collection device and is insulated, and other parts are similar to the rotary kiln; for the installation position of the oxygen-rich nozzle of the decomposition furnace, it is different from the original invention, and generally requires that the center line of the oxygen-rich nozzle, the center line of the coal injection pipe and the center line of the C4 discharge pipe are in a straight line.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] The application provides an energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for a rotary kiln, which comprises a rotary kiln high-temperature gas collecting device, a rotary kiln gas ejector and a rotary kiln oxygen-rich nozzle, wherein the rotary kiln oxygen-rich nozzle and the rotary kiln high-temperature gas collecting device are in communication with the rotary kiln gas ejector, one end of the rotary kiln high-temperature gas collecting device, which is away from the rotary kiln gas ejector, is connected with a rotary kiln head cover of the rotary kiln, high-temperature gas in the rotary kiln head cover enters the rotary kiln gas ejector through the rotary kiln high-temperature gas collecting device, the rotary kiln gas ejector is also in communication with an oxygen source, oxygen enrichment of the oxygen source is mixed in the rotary kiln gas ejector, and the mixed gas is introduced into the rotary kiln oxygen-rich nozzle, a mounting hole is arranged on the rotary kiln head cover, the rotary kiln oxygen-rich nozzle penetrates through the mounting hole, the rotary kiln oxygen-rich nozzle comprises a nozzle body and a connecting hose, two ends of the connecting hose are in communication with the nozzle body and the rotary kiln gas ejector respectively, one end of the nozzle body is located in the rotary kiln, and the other end is located outside the mounting hole, the outer periphery of the nozzle body located outside the mounting hole is uniformly provided with four lifting rings, wherein two of the lifting rings are adjusting lifting rings for adjusting the angle of the rotary kiln oxygen-rich nozzle, and the other two lifting rings are fixing lifting rings for fixing the rotary kiln oxygen-rich nozzle, a fixed steel pipe is further arranged on the outer side of the rotary kiln, a matching screw thread on the fixed steel pipe is detachably connected with a lifting hook through a lifting hook movable joint, the nozzle body can rotate along the central axis of the nozzle body, and the lifting hook is connected with one of the fixing lifting rings to fix the nozzle body.

[0009] By setting two fixed lifting rings on the oxygen-enriched nozzle of the rotary kiln, the two fixed lifting rings are centrally symmetric around the central axis of the oxygen-enriched nozzle of the rotary kiln. After a long period of use, if the nozzle body of the oxygen-enriched nozzle of the rotary kiln is bent downward, the lifting hook and the fixed lifting ring can be disassembled, the angle of the oxygen-enriched nozzle of the rotary kiln is adjusted, the oxygen-enriched nozzle of the rotary kiln is rotated by 180° around its own central axis, and the jet direction of the oxygen-enriched nozzle of the rotary kiln can be adjusted, which helps to deliver oxygen-enriched air to the position in the rotary kiln that needs oxygen-enriched air the most, thereby enhancing the combustion-supporting effect. Since the two fixed lifting rings are centrally symmetrically distributed, after the oxygen-enriched nozzle of the rotary kiln is rotated by 180°, the fixed lifting ring originally located above is rotated to the lower side, and can still be aligned and installed with the lifting hook to realize the fixation of the oxygen-enriched nozzle of the rotary kiln. Since the angle of the oxygen-enriched nozzle of the rotary kiln can be adjusted, the oxygen-enriched nozzle of the rotary kiln does not need to be frequently replaced, which not only avoids the need to stop the rotary kiln to replace the equipment, affects the normal operation of the rotary kiln, and reduces energy saving and emission reduction effects, but also significantly prolongs the service life of the oxygen-enriched nozzle of the rotary kiln, making the present application more practical and better in the effects of comprehensive energy saving and emission reduction, yield increase and efficiency improvement. During operation, the rotary kiln control valve can be first opened to reduce the oxygen-enriched air temperature entering the rotary kiln (for example, to 80°C), then the fixed lifting hook and the fixed lifting ring are separated, the refractory sealing filler between the rotary kiln mounting hole and the oxygen-enriched nozzle of the rotary kiln is removed, the oxygen-enriched nozzle of the rotary kiln is slowly rotated by 180° through the hose union joint, the fixed lifting ring is aligned and installed with the lifting hook, and the refractory sealing filler is refilled, so that the energy-saving and emission-reducing yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln can normally operate, and ensure that the oxygen-enriched air can be accurately delivered to the thickest area of the "burning zone" close to the clinker.

[0010] As a preferred scheme of the energy-saving and emission-reducing yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln, the rotary kiln high-temperature gas collecting device comprises a rotary kiln high-temperature gas collecting porous pipe, the rotary kiln high-temperature gas collecting porous pipe is in communication with the rotary kiln gas air ejector, the gas inlet end of the rotary kiln high-temperature gas collecting porous pipe is located in the rotary kiln head cover, a plurality of gas inlet holes are arranged on the gas inlet end of the rotary kiln high-temperature gas collecting porous pipe, and the total hole area of all the gas inlet holes is greater than the cross-sectional area of the rotary kiln high-temperature gas collecting porous pipe; the gas inlet holes are inclinedly arranged, and the length direction of the gas inlet holes is consistent with the gas flow direction.

[0011] As a preferred scheme of the energy-saving and emission-reducing yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln, the connection hose and the nozzle body are detachably connected through a hose union joint, when the hose union joint is tightened, the connection hose and the nozzle body are fixed, and when the hose union joint is loosened, the nozzle body can be rotated.

[0012] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln, when the oxygen source is a normal-pressure oxygen source, the rotary kiln gas ejector is communicated with the rotary kiln oxygen-rich nozzle through a rotary kiln blower. The rotary kiln blower can provide kinetic energy for a rotary kiln high-temperature gas collecting device, so that high-temperature gas in a rotary kiln head cover can flow into the rotary kiln high-temperature gas collecting device and then into the rotary kiln gas ejector to be mixed with oxygen.

[0013] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln, when the oxygen source is a high-pressure oxygen source, the rotary kiln gas ejector is directly communicated with the rotary kiln oxygen-rich nozzle. At this time, the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln can not be provided with a rotary kiln blower. Since the oxygen source is a high-pressure oxygen source, high-temperature air in the rotary kiln is extracted through the rotary kiln gas ejector and then sent into the thickest region of the "burning zone" near the clinker through the rotary kiln oxygen-rich nozzle.

[0014] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln, the rotary kiln high-temperature gas collecting device comprises a rotary kiln gas collecting main pipe and two rotary kiln shunt branch pipes, the two rotary kiln shunt branch pipes are respectively communicated with the rotary kiln gas collecting main pipe, the rotary kiln gas collecting main pipe is connected with the rotary kiln through a rotary kiln high-temperature gas collecting porous pipe, a rotary kiln gas collecting temperature table is arranged on the rotary kiln gas collecting main pipe, the rotary kiln gas collecting temperature table is used to detect the temperature of gas in the rotary kiln gas collecting main pipe, the two rotary kiln shunt branch pipes are respectively connected with the rotary kiln gas ejector, a rotary kiln shunt branch pipe on-off valve and a rotary kiln filter are arranged on the two rotary kiln shunt branch pipes, the rotary kiln shunt branch pipe on-off valve is used to control the flow of gas in the rotary kiln shunt branch pipe, and the rotary kiln filter is used to filter gas in the rotary kiln shunt branch pipe. When one of the rotary kiln shunt branch pipes is blocked and needs to be repaired, the other rotary kiln shunt branch pipe can be directly used for gas collection, so that the device can be prevented from being stopped for repair, the loss of production time can be reduced, the production efficiency can be ensured, and the combustion-supporting effect of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln on the rotary kiln during the repair period can be ensured.

[0015] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for a rotary kiln, the rotary kiln high-temperature gas collecting device further comprises a rotary kiln gas suction pipe, one end of the rotary kiln gas suction pipe is communicated with the rotary kiln gas collecting main pipe, the other end of the rotary kiln gas suction pipe is communicated with the outside, and a rotary kiln control valve is arranged on the rotary kiln gas suction pipe. The rotary kiln control valve is used to control the flow of gas in the rotary kiln gas suction pipe. By arranging the rotary kiln gas suction pipe, the temperature of the gas mixed with oxygen can be adjusted by adjusting the flow of high-temperature gas in the rotary kiln high-temperature gas collecting device, which is helpful to achieve the best combustion-supporting effect.

[0016] As a preferred scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln, the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln further comprises a rotary kiln oxygen-rich pressure stabilizing tank, the rotary kiln gas ejector is connected with the rotary kiln oxygen-rich nozzle through the rotary kiln oxygen-rich pressure stabilizing tank, and the rotary kiln oxygen-rich pressure stabilizing tank is used for stabilizing the oxygen-rich pressure flowing into the rotary kiln oxygen-rich nozzle. By arranging the rotary kiln oxygen-rich pressure stabilizing tank, the gas pressure of the gas flowing into the rotary kiln oxygen-rich nozzle can be adjusted, so that the oxygen-rich combustion-supporting pressure entering the rotary kiln is basically stable, and the relative stability of combustion in the rotary kiln is beneficial to be ensured.

[0017] As a preferred scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln, the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kiln further comprises a rotary kiln oxygen supply pipe, the rotary kiln oxygen-rich pressure stabilizing tank is connected with the rotary kiln oxygen-rich nozzle through the rotary kiln oxygen supply pipe, rotary kiln adjusting valves, rotary kiln flow meters, rotary kiln micro pressure gauges and rotary kiln oxygen supply pipe temperature gauges are arranged on the rotary kiln oxygen supply pipe, the rotary kiln adjusting valves are used for adjusting the flow of the gas in the rotary kiln oxygen supply pipe, and the rotary kiln flow meters, the rotary kiln micro pressure gauges and the rotary kiln oxygen supply pipe temperature gauges are respectively used for measuring the flow, pressure and temperature of the gas in the rotary kiln oxygen supply pipe. By arranging the rotary kiln adjusting valves, the rotary kiln flow meters, the rotary kiln micro pressure gauges and the rotary kiln oxygen supply pipe temperature gauges, the flow, pressure and temperature of the gas in the rotary kiln oxygen supply pipe can be monitored, the rotary kiln shunt branch pipe on-off valves, the rotary kiln adjusting valves and the rotary kiln control valves are adjusted according to the monitoring structure, the oxygen-rich state of the rotary kiln oxygen-rich nozzle is adjusted in real time according to actual needs, and the rotary kiln is kept in the best combustion state at all times.

[0018] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln, the application further comprises a decomposing furnace, a decomposing furnace gas air ejector, a decomposing furnace high-temperature gas collecting device and a decomposing furnace oxygen-rich nozzle group, the decomposing furnace is communicated with the rotary kiln head cover through a tertiary air pipe, the decomposing furnace high-temperature gas collecting device, the oxygen source and the decomposing furnace oxygen-rich nozzle group are respectively communicated with the decomposing furnace gas air ejector, one end of the decomposing furnace high-temperature gas collecting device away from the decomposing furnace gas air ejector is communicated with the tertiary air pipe, the high-temperature gas in the tertiary air pipe enters the decomposing furnace gas air ejector through the decomposing furnace high-temperature gas collecting device, the decomposing furnace gas air ejector is further communicated with the oxygen source, the oxygen-rich of the oxygen source enters the decomposing furnace gas air ejector and mixes with the high-temperature gas inside the decomposing furnace gas air ejector, and the mixed gas is sprayed into the decomposing furnace through the decomposing furnace oxygen-rich nozzle group. By arranging the decomposing furnace oxygen-rich nozzle and the decomposing furnace high-temperature gas collecting device, the high-temperature gas in the tertiary air pipe can be used to support the combustion of the decomposing furnace after mixing with the oxygen-rich of the oxygen source, so that the combustion effect of the fuel in the decomposing furnace and the decomposition rate of the raw material are improved.

[0019] As an optimal scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln, the rotary kiln oxygen-rich nozzle is in a flat mouth shape, the center line of the rotary kiln oxygen-rich nozzle, the center line of the upper burner of the rotary kiln and the center line of the thickest distribution area of the clinker in the rotary kiln are in the same plane. The above installation position of the rotary kiln oxygen-rich nozzle can make the flame move downward due to the sweeping of the oxygen-rich high pressure, so that the unburned material is fully burned to make the clinker absorb more effective heat, and can also prolong the service life of the rotary kiln cylinder. The end of the rotary kiln oxygen-rich nozzle into the kiln must be a flat mouth, and the length-width ratio must be greater than 2, so as to ensure that the high-quality oxygen-rich gas sprayed from the rotary kiln oxygen-rich nozzle does not disperse, thereby achieving better effects such as energy saving, emission reduction, yield increase and efficiency improvement.

[0020] As a preferred scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln, the high-temperature gas collecting device of the decomposing furnace comprises a decomposing furnace gas taking main pipe switch valve, a decomposing furnace gas taking main pipe and two decomposing furnace shunt branch pipes, the decomposing furnace gas taking main pipe is communicated with the decomposing furnace gas-air ejector, the gas inlet end of the decomposing furnace gas taking main pipe is located in the tertiary air pipe, the decomposing furnace gas taking main pipe switch valve is arranged on the tertiary air pipe, the two decomposing furnace shunt branch pipes are respectively communicated with the decomposing furnace gas taking main pipe, a decomposing furnace oxygen supply pipe temperature table is arranged on the decomposing furnace gas taking main pipe, the decomposing furnace oxygen supply pipe temperature table is used for detecting the temperature of the gas in the decomposing furnace gas taking main pipe, the ends of the two decomposing furnace shunt branch pipes away from the decomposing furnace gas taking main pipe are respectively connected with the decomposing furnace gas-air ejector, a decomposing furnace shunt branch pipe switch valve and a decomposing furnace filter are arranged on each of the two decomposing furnace shunt branch pipes, the decomposing furnace shunt branch pipe switch valve is used for controlling the flow of the gas in the decomposing furnace shunt branch pipe, and the decomposing furnace filter is used for filtering the high-temperature tertiary air in the decomposing furnace shunt branch pipe.

[0021] As a preferred scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln, the RDF feeding cylinder and the coal injection pipe are arranged on the decomposing furnace, and the decomposing furnace oxygen-rich nozzle group comprises a plurality of decomposing furnace oxygen-rich nozzles.

[0022] As a preferred scheme of the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln, the oxygen source is used for igniting the rotary kiln, and the oxygen-rich concentration is not higher than 95%, so that the ignition time of the rotary kiln can be shortened and the high-quality fuel such as diesel oil used for ignition can be reduced.

[0023] The beneficial effects of the present application are: by setting two fixed lifting rings on the oxygen-enriched nozzle of the rotary kiln, the two fixed lifting rings are centrally symmetric around the central axis of the oxygen-enriched nozzle of the rotary kiln, and after long-term use, if the nozzle body of the oxygen-enriched nozzle of the rotary kiln is bent downward, the two hooks can be disassembled with the two fixed lifting rings, the angle of the oxygen-enriched nozzle of the rotary kiln is adjusted, the oxygen-enriched nozzle of the rotary kiln is rotated 180° around its own central axis, so that the jet direction of the oxygen-enriched nozzle of the rotary kiln can be adjusted, which helps to deliver oxygen-enriched air to the position in the rotary kiln that needs oxygen-enriched air the most, and enhances the combustion-supporting effect; since the two fixed lifting rings are centrally symmetrically distributed, after the oxygen-enriched nozzle of the rotary kiln is rotated 180°, the two fixed lifting rings can still be aligned and installed with the two hooks to fix the oxygen-enriched nozzle of the rotary kiln; since the angle of the oxygen-enriched nozzle of the rotary kiln can be adjusted at any time without stopping the oxygen-enriched equipment, it ensures that the oxygen is accurately delivered to the required position of the product at all times, and multiple equipment shutdowns are not required to replace the oxygen-enriched nozzle of the rotary kiln, avoiding the need to stop the kiln to replace the oxygen-enriched nozzle of the rotary kiln in the energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion-supporting system for rotary kilns, which affects the normal operation of the rotary kiln and reduces energy-saving and emission-reducing effects, and also significantly prolongs the service life of the oxygen-enriched nozzle of the rotary kiln, making the present application more practical and better in comprehensive energy-saving, emission-reducing, yield-increasing and efficiency-improving effects. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described in detail below according to the drawings and examples.

[0025] Figure 1 The installation schematic diagram of the oxygen-enriched nozzle of the rotary kiln and the rotary kiln head cover is described in the embodiments of the present application.

[0026] Figure 2 The cross-sectional schematic diagram of the oxygen-enriched nozzle of the rotary kiln is described in the embodiments of the present application.

[0027] Figure 3 The schematic diagram of a VPSA precise oxygen-increasing combustion-supporting system for a cement rotary kiln is described in the embodiments of the present application.

[0028] Figure 4 The arrangement schematic diagram of an oxygen-enriched nozzle of a RDF-containing decomposition furnace is described in the embodiments of the present application.

[0029] Figure 5 The schematic diagram of a pure oxygen precise oxygen-increasing combustion-supporting system for a needle coke rotary kiln is described in the embodiments of the present application. (The arrow indicates the rotation direction)

[0030] Figure 6 The schematic diagram of a set of oxygen-increasing precise combustion-supporting system for 8 aluminum oxide rotary kilns is described in the embodiments of the present application.

[0031] Figure 7 The schematic diagram of a high-temperature gas taking multi-hole pipe of a rotary kiln is described in the embodiments of the present application.

[0032] In the figure:

[0033] 100, rotary kiln head cover; 200, decomposing furnace;

[0034] 1, oxygen source; 2, rotary kiln gas ejector; 3, rotary kiln shunt branch on-off valve; 4, rotary kiln filter; 5, rotary kiln gas temperature gauge; 6, rotary kiln regulating valve; 7, rotary kiln fan; 8, decomposing furnace gas ejector; 9, decomposing furnace shunt branch on-off valve; 10, decomposing furnace filter; 11, rotary kiln oxygen-enriched pressure stabilizer; 12, rotary kiln regulating valve; 13, rotary kiln flow gauge; 14, rotary kiln micro-pressure gauge; 15, rotary kiln oxygen supply pipe temperature gauge; 16, tertiary air pipe; 17, nozzle body; 18, rotary kiln high-temperature gas extraction porous pipe; 1801, gas inlet hole; 19, decomposing furnace gas extraction temperature gauge; 20, decomposing furnace gas extraction main pipe on-off valve; 21, decomposing furnace fan; 22, decomposing furnace oxygen-enriched pressure stabilizer; 23, decomposing furnace oxygen supply pipe temperature gauge; 24, decomposing furnace flow gauge; 25, decomposing furnace micro-pressure gauge; 26, decomposing furnace regulating valve; 27, decomposing furnace regulating valve; 28, decomposing furnace oxygen-enriched nozzle; 29, C4 discharging pipe; 30, RDF feeding cylinder; 31, coal injection pipe; 32, burner; 33, oxygen-enriched regulating valve; 34, fixed lifting ring; 35, lifting hook; 36, refractory sealing filler; 37, hose union; 38, connecting hose; 39, adjusting lifting ring; 40, lifting hook union; 41, fixed steel pipe; 42, sealing sleeve. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Embodiment one: a VPSA precise oxygenation combustion-supporting system for a cement rotary kiln

[0038] Reference Figures 1 to 3The VPSA precise oxygen-increasing combustion-supporting system for the cement rotary kiln comprises an oxygen source 1, a rotary kiln gas ejector 2, a rotary kiln shunt branch switch valve 3, a rotary kiln filter 4, a rotary kiln gas temperature table 5, a rotary kiln control valve 6, a rotary kiln fan 7, a decomposing furnace gas ejector 8, a decomposing furnace shunt branch switch valve 9, a decomposing furnace filter 10, a rotary kiln oxygen-enriched pressure stabilizing tank 11, a rotary kiln adjusting valve 12, a rotary kiln flow table 13, a rotary kiln micro-pressure table 14, a rotary kiln oxygen supply pipe temperature table 15, a tertiary air pipe 16, a rotary kiln oxygen-enriched nozzle, a rotary kiln high-temperature gas extraction porous pipe 18, a decomposing furnace gas temperature table 19, a decomposing furnace gas main pipe switch valve 20, a decomposing furnace fan 21, a decomposing furnace oxygen-enriched pressure stabilizing tank 22, a decomposing furnace oxygen supply pipe temperature table 23, a decomposing furnace flow table 24, a decomposing furnace micro-pressure table 25, a decomposing furnace adjusting valve 26, a decomposing furnace control valve 27, a decomposing furnace oxygen-enriched nozzle 28, a rotary kiln high-temperature gas collecting device, a rotary kiln oxygen supply pipe, a decomposing furnace high-temperature gas collecting device and a decomposing furnace oxygen supply pipe.

[0039] The rotary kiln high-temperature gas collecting device further comprises a rotary kiln gas suction pipe, one end of the rotary kiln gas suction pipe is in communication with the rotary kiln gas main pipe, and the other end is in communication with the outside, and the rotary kiln gas suction pipe is provided with the rotary kiln control valve 6, and the rotary kiln control valve 6 is used to control the flow of gas in the rotary kiln gas suction pipe. By setting the rotary kiln gas suction pipe, the temperature of the gas mixed with oxygen can be adjusted by adjusting the flow of high-temperature gas in the rotary kiln high-temperature gas collecting device, which helps to achieve the best combustion-supporting effect.

[0040] Referring to Figure 3 The oxygen source 1, the rotary kiln gas ejector 2, the rotary kiln filter 4 and the rotary kiln high-temperature gas extraction porous pipe 18 are connected in sequence, the rotary kiln gas ejector 2 is in communication with the oxygen source 1 and the rotary kiln high-temperature gas collecting device respectively, and high-quality oxygen-enriched gas is obtained by mixing the oxygen-enriched gas in the oxygen source 1 and the high-temperature gas in the rotary kiln head cover 100 extracted by the rotary kiln fan 7; the rotary kiln filter 4 is configured with two sets, which not only facilitates switching, but also ensures that the energy-saving, emission-reducing, yield-increasing and efficiency-improving precise oxygen-increasing combustion-supporting system for the rotary kiln can continuously and stably operate, and the rotary kiln gas temperature table 5 and the rotary kiln control valve 6 are added outside the rotary kiln head, which ensures that the oxygen-enriched gas temperature slowly and stably increases, and at the same time ensures that the oxygen-enriched pipe and the high-temperature rotary kiln fan 7 are not damaged by sudden ultra-high temperature (>1000℃).

[0041] At the same time, the rotary kiln fan 7 (refer to Figure 5For the user has high pressure oxygen source 1, the rotary kiln fan 7 is not used), rotary kiln oxygen-rich pressure tank 11, rotary kiln regulating valve 12 and rotary kiln rotary kiln oxygen-rich nozzle is connected in turn; rotary kiln fan 7 must be through the rotary kiln regulating valve 12 to adjust to meet the design of rotary kiln oxygen-rich flow, oxygen-rich temperature and oxygen-rich pressure requirements; rotary kiln oxygen-rich nozzle into the kiln end must be flat, its length-width ratio must be greater than 2, to ensure that the high-quality oxygen from the rotary kiln oxygen-rich nozzle is not dispersed, thereby achieving better effects such as energy saving, emission reduction, yield increase and efficiency improvement.

[0042] Referring to Figure 3 Among them, the oxygen source 1, the rotary kiln gas ejector 2, the rotary kiln shunt branch switch valve 3, the rotary kiln filter 4, the rotary kiln gas temperature table 5, the rotary kiln control valve 6, the rotary kiln fan 7, the rotary kiln oxygen-rich pressure tank 11, the rotary kiln regulating valve 12, the rotary kiln flow meter 13, the rotary kiln micro pressure gauge 14, the rotary kiln oxygen supply pipe temperature table 15, the rotary kiln oxygen-rich nozzle, the rotary kiln high-temperature gas extraction porous pipe 18, the rotary kiln high-temperature gas collection device and the rotary kiln oxygen supply pipe form a subsystem, high-temperature secondary air is extracted from the rotary kiln head cover 100 and mixed with oxygen to form oxygen-enriched air at about 600°C, which is sent to the part of the product in the rotary kiln that needs oxygen the most through the rotary kiln oxygen-rich nozzle: on the one hand, the flame is swept downward due to the high pressure of the oxygen-enriched air, making the unburned material burn fully so that the clinker absorbs more effective heat; on the other hand, it can also prolong the service life of the rotary kiln cylinder.

[0043] Among them, the oxygen source 1 is used for igniting the rotary kiln, and the oxygen concentration of the oxygen source 1 is not higher than 95%. By setting the oxygen concentration of the oxygen source 1 to be not higher than 95%, the ignition time of the rotary kiln can be shortened and the high-quality fuel such as diesel oil used during ignition can be reduced.

[0044] For the cement kiln decomposing furnace 200, the oxygen source 1, the decomposing furnace gas ejector 8, the decomposing furnace filter 10 and the decomposing furnace gas extraction main pipe switch valve 20 are connected in turn; the decomposing furnace gas ejector 8 and the decomposing furnace filter 10 have the same effect as the rotary kiln gas ejector 2 and the rotary kiln filter 4; the decomposing furnace gas extraction temperature table 19, the decomposing furnace gas extraction main pipe switch valve 20 and the decomposing furnace control valve 27 are controlled to ensure that the oxygen enrichment device operates continuously and stably.

[0045] At the same time, the decomposing furnace fan 21, the decomposing furnace oxygen-rich pressure tank 22, the decomposing furnace regulating valve 26 and the decomposing furnace oxygen-rich nozzle 28 are connected in turn; the decomposing furnace fan 21 must be adjusted through the decomposing furnace regulating valve 26 to meet the design requirements of the decomposing furnace 200 oxygen-rich flow, oxygen-rich temperature and oxygen-rich pressure; the number of decomposing furnace oxygen-rich nozzles 28 must be the same as the number of coal injection pipes 31 of the decomposing furnace 200; if there are RDFs including hazardous waste and other waste (hereinafter referred to as RDFs) into the furnace, another oxygen-rich nozzle is also needed, and the number of oxygen-rich nozzles is determined according to the amount of RDFs into the furnace, thereby achieving better effects such as energy saving, emission reduction, yield increase and efficiency improvement.

[0046] The decomposition furnace gas ejector 8, the decomposition furnace shunt branch switch valve 9, the decomposition furnace filter 10, the decomposition furnace gas extraction temperature table 19, the decomposition furnace gas extraction main pipe switch valve 20, the decomposition furnace fan 21, the decomposition furnace oxygen-enriched pressure stabilizing tank 22, the decomposition furnace oxygen supply pipe temperature table 23, the decomposition furnace flow meter 24, the decomposition furnace micro-pressure table 25, the decomposition furnace regulating valve 26, the decomposition furnace control valve 27, the decomposition furnace oxygen-enriched nozzle 28, the decomposition furnace high-temperature gas collecting device, and the decomposition furnace oxygen supply pipe constitute another subsystem. By opening the decomposition furnace gas extraction main pipe switch valve 20, high-temperature tertiary air is extracted and mixed with oxygen-enriched air to form oxygen-enriched air at about 600°C, which is sent to the part of the product in the decomposition furnace 200 that needs the most oxygen-enriched air through the decomposition furnace oxygen-enriched nozzle 28. Specifically, the decomposition furnace oxygen-enriched nozzle 28, the coal injection pipe 31 of the decomposition furnace 200, and the C4 discharge pipe 29 are on the same straight line, so that the pulverized coal can burn as soon as possible to release more effective heat and promote the increase of raw material decomposition rate, thereby achieving the effects of comprehensive energy saving, emission reduction, yield increase, and efficiency improvement. In addition, the ignition time of the rotary kiln can be shortened and the high-quality fuel such as diesel oil used during ignition can be reduced.

[0047] In addition, for the installation of the rotary kiln oxygen-enriched nozzle, not only is it required that the center line of the oxygen-enriched nozzle flat mouth, the center line of the rotary kiln burner 32, and the center line of the thickest region of the clinker distribution in the rotary kiln are on the same plane, but also it is required that the upward slope of the rotary kiln oxygen-enriched nozzle and the slope of the rotary kiln are consistent to ensure that the high-quality oxygen-enriched air sprayed by the rotary kiln oxygen-enriched nozzle neither sweeps the clinker to cause unstable kiln conditions nor affects the flame shape. At the same time, due to the high-speed oxygen-enriched air, the unburned substances are swept away to be completely burned to release more effective heat, which is fully absorbed by the clinker, thereby making the clinker quality better.

[0048] The rotary kiln rotary kiln oxygen-enriched nozzle is relatively long, generally between 4-7 meters, the rotary kiln kiln head cover 100 has a secondary air temperature of about 1300°C, not only collides with high-temperature clinker of about 1500°C and sticks to the surface, but also is suspended at one end and is easy to bend. In view of the above situation, the present application uniformly welds (90°) four lifting rings at the outer end of the rotary kiln kiln head cover 100 (about 200mm away from the front wall of the rotary kiln kiln head cover 100) of the rotary kiln rotary kiln oxygen-enriched nozzle, wherein the two symmetrical ones (horizontal direction) are adjustment lifting rings 39 for adjusting the angle of the rotary kiln rotary kiln oxygen-enriched nozzle, and the other two (vertical direction, actually with a certain deviation, depending on the kiln speed and the rotation direction of the kiln, to ensure that the center line of the rotary kiln oxygen-enriched nozzle, the center line of the burner 32 of the rotary kiln, and the center line of the thickest region of the clinker distribution in the rotary kiln are in the same plane) are fixed lifting rings 34 for fixing the rotary kiln rotary kiln oxygen-enriched nozzle. The outer side of the rotary kiln is also provided with a fixed steel pipe 41, which is detachably connected with a lifting hook 35 through a lifting hook movable joint 40, and the nozzle body 17 of the rotary kiln oxygen-enriched nozzle and the connecting hose 38 are adjusted and fixed through a hose movable joint 37. When the nozzle body 17 of the rotary kiln oxygen-enriched nozzle is found to be bent [which can be obviously seen from the DCS (Distributed Control System) in the central control room or the fire observation hole], the opening of the rotary kiln control valve 6 is increased, the temperature of the rotary kiln oxygen supply pipe temperature table 15 is lowered to about 80°C, then the lifting hook 35 and the fixed lifting ring 34 are slowly separated, the hose movable joint 37 is loosened, the lifting hook movable joint 40 is loosened, the part of the refractory sealing filler 36 between the rotary kiln rotary kiln oxygen-enriched nozzle and the sealing sleeve 42 is taken out, the rotary kiln rotary kiln oxygen-enriched nozzle can be slowly rotated about 180° through the adjustment lifting ring 39 on the rotary kiln rotary kiln oxygen-enriched nozzle (with a spare flat mouth adjustment steel pipe sleeve), the lifting hook is adjusted and fixed, the gap between the rotary kiln oxygen-enriched nozzle and the rotary kiln mounting hole is filled with the refractory sealing filler 36, the fixed lifting ring 34 and the lifting hook 35 are adjusted and installed, and finally the opening of the rotary kiln control valve 6 is adjusted to the original set opening, and the rotary kiln shunt branch pipe switch valve 3 is adjusted to ensure that the oxygen-enriched combustion-supporting equipment operates normally and that the oxygen can be accurately sent to the "burning zone" near the thickest region of the clinker: not only avoids stopping the oxygen-enriched combustion-supporting equipment to replace the rotary kiln oxygen-enriched nozzle, affecting the normal operation of the cement kiln, but also reduces energy saving and emission reduction, etc. effects, also significantly prolongs the service life of the rotary kiln oxygen-enriched nozzle, and makes the present application more practical, and the effects of comprehensive energy saving and emission reduction, yield increase and efficiency improvement are better! Of course, the structure of the rotary kiln oxygen-enriched nozzle can be the same as that of the rotary kiln oxygen-enriched nozzle. The adjustment lifting ring 39 and the fixed lifting ring 34 have a spacing distance of 200mm from the rotary kiln kiln head cover 100. The two adjustment lifting rings 39 are respectively located between the two fixed lifting rings 34.

[0049] The rotary kiln high-temperature gas collecting device comprises a rotary kiln gas collecting main pipe, a collecting pipe and two rotary kiln shunt branch pipes, the two rotary kiln shunt branch pipes are communicated with the rotary kiln gas collecting main pipe, the ends of the two rotary kiln shunt branch pipes away from the rotary kiln gas collecting main pipe are communicated with the collecting pipe, the collecting pipe is communicated with the rotary kiln gas ejector 2, the rotary kiln gas collecting main pipe is connected with the rotary kiln head cover 100 through the rotary kiln high-temperature gas collecting porous pipe 18, the rotary kiln gas collecting main pipe is provided with a rotary kiln gas collecting temperature table 5, the rotary kiln gas collecting temperature table 5 is used for detecting the temperature of the gas in the rotary kiln gas collecting main pipe, the rotary kiln shunt branch pipes are provided with rotary kiln shunt branch pipe on-off valves 3 and rotary kiln filters 4, the rotary kiln shunt branch pipe on-off valves 3 are used for controlling the flow of the gas in the rotary kiln shunt branch pipes, and the rotary kiln filters 4 are used for filtering the gas in the rotary kiln shunt branch pipes. When one of the rotary kiln shunt branch pipes is blocked and needs to be repaired, the other rotary kiln shunt branch pipe can be directly used for gas collection, so that the kiln can not be stopped for repair, the loss of production time can be reduced, the production efficiency can be ensured, and the combustion supporting effect of the rotary kiln energy-saving, emission-reducing, yield-increasing and efficiency-improving type precise oxygen-increasing combustion supporting system on the rotary kiln during the maintenance period can be ensured. The rotary kiln high-temperature gas collecting device is arranged in connection with the rotary kiln, the original gas collector is omitted, the possibility of blockage of the gas source is reduced, the rotary kiln filters 4 arranged on the rotary kiln shunt branch pipes can filter the high-temperature gas, and the impurities in the gas can be prevented from being blocked in the rotary kiln gas ejector 2.

[0050] The rotary kiln regulating valve 6 can control the temperature, pressure, flow and concentration of the oxygen-enriched gas flowing into the rotary kiln oxygen-enriched nozzle by adjusting the flow of the high-temperature gas in the rotary kiln gas collecting main pipe, and can also protect the equipment and prevent the equipment from being damaged due to sudden temperature rise.

[0051] With reference to Figure 7 The rotary kiln high-temperature gas collecting porous pipe 18 can facilitate gas collection from the rotary kiln head cover 100. In the embodiment, the material of the high-temperature gas collecting porous pipe 18 is high-temperature ceramic, the inner diameter of the pipe is 300 mm, the wall thickness of the pipe is 10 mm, the total length of the pipe is 1 m, the diameter of the gas inlet hole 1801 on the rotary kiln high-temperature gas collecting porous pipe 18 is 20 mm, the gas inlet holes 1801 are uniformly distributed and the number of the gas inlet holes 1801 is about 500, and the inclination angle θ of the gas inlet holes 1801 is about 30°. By inclining the gas inlet holes 1801, the high-temperature gas in the rotary kiln head cover 100 can flow into the rotary kiln high-temperature gas collecting porous pipe 18 more easily, and the difficulty of gas collection is reduced. The long-term use temperature of the rotary kiln high-temperature gas collecting porous pipe 18 is between 1000-1300℃, the surrounding is high-temperature flue gas, the pressure is slightly negative, and the flange on the rotary kiln high-temperature gas collecting porous pipe 18 is according to the SH / T 3406-2013 standard, and the pressure is 0.6 MPa.

[0052] In the above system, the oxygen source 1 is selected from VPSA oxygen production and user surplus oxygen, and the oxygen concentration is generally between 50-100%.

[0053] For different clinker production lines, the use of the present embodiment generally saves coal by 3-15%, reduces CO by 20-70%, increases clinker strength by 1-3 MPa, increases load by 5-30%, reduces dust by 5-30%, significantly reduces C1 outlet temperature and oxygen content, significantly prolongs overhaul and kiln age, shortens rotary kiln ignition time by 5-15%, saves high-quality fuel by 5-25%, and the like.

[0054] The following will be described in detail with an example of a 6000-ton clinker production line: Oxygen source 1 is VPSA (pressure adsorption vacuum desorption), model 1000-80%, that is, oxygen-rich flow 1000 standard cubic meters / hour, oxygen-rich concentration 80%, which is about 1 / 3 lower than the original oxygen-rich flow of the invention, and after mixing and pressurizing, the oxygen-rich concentration is generally controlled at 30-50%, the pressure is about 20-40 kPa, and the rotary kiln and decomposing furnace 200 oxygen-rich temperature is between 500-700°C; when the rotary kiln is ignited, the oxygen-rich flow is controlled at 800 standard cubic meters / hour, the oxygen-rich concentration is 95%, and the oxygen-rich pressure is about 30 kPa. The above parameters can be applied to various working conditions of the rotary kiln, and better comprehensive effects such as energy saving, emission reduction, yield increase, and efficiency improvement can be obtained. After implementation, the clinker yield increases by about 4.8%-8.5%, with an average increase of about 6.5%; the 28-day clinker strength increases by about 0.9-2.1 MPa, with an average increase of about 1.4 MPa; the standard coal consumption per ton of clinker decreases from 96.2-99.8 kg to 90.6-95.2 kg, with an average decrease of 5.2%; the average parameters of C1 outlet: oxygen content decreases from 2.3% to 1.7%, CO decreases by 34.5%, temperature decreases from 299.7°C to 293.4°C, and dust content in flue gas decreases by an average of 8.5%; ignition (warming up) time is generally reduced from 20-24 hours to 19-22.7 hours, diesel consumption is reduced by an average of about 8.5%, and the rotary kiln runs more stably, the running period is significantly prolonged, and the ring formation is significantly reduced.

[0055] Example Two: A VPSA precise oxygenation and combustion supporting system for a rotary kiln with RDF

[0056] At present, not only is energy in short supply and prices soaring, but RDF (Refuse Derived Fuel) is also extremely harmful, and the state is vigorously promoting the high-value and efficient resource utilization of RDF. After the implementation of the present case, not only can more RDF be burned, but the comprehensive effects of energy saving, emission reduction, yield increase, and efficiency improvement are better.

[0057] This example two is designed according to the specific operation data of two 6000 tons of clinker production line of a domestic company. The company consumed 474500 tons of coal in 2021, 252800 tons of incinerated household garbage and 22500 tons of industrial solid waste, the average low heating value of the three fuels is 25975 kJ / kg, 6079 kJ / kg and 5810 kJ / kg respectively, 37502000 tons of clinker is produced, the average clinker strength of 28 days is 53.67 MPa, the average parameters of C1 outlet are: temperature 306.4℃, oxygen content 2.55%, CO 345 ppm. The relevant structure and process are similar to example one, see Figure 4 Because of the low RDF heat value and high water content, the oxygen-enriched flow designed in this example is 2000±20% standard cubic meters / hour, and the oxygen-enriched concentration is 85±10%. For the RDF feeding cylinder 30, the oxygen-enriched concentration is controlled at 60±10% to ensure fast combustion of RDF and release more effective heat to quickly decompose the raw material and ensure the temperature of the decomposing furnace 200 more stable. After the implementation, the average consumption of standard coal per ton of clinker decreased by 5.6%, the average clinker output increased by 3.5%, the incineration of household garbage and industrial solid waste increased by 5.4% and 6.3% respectively, the average clinker strength of 28 days increased by 1.26 MPa, the average parameters of C1 outlet are: temperature decreased by 6.3℃, oxygen content decreased by 23.5%, CO decreased by 35.1%, the average dust content of flue gas decreased by 9.2%, the ignition (warming up) time generally decreased from 20-24 hours to 19.2-22.9 hours, the average diesel consumption decreased by about 8.3%, and the rotary kiln ran more stably with less ring formation.

[0058] Example three: a pure oxygen precise oxygenation combustion-supporting system for needle coke rotary kiln

[0059] Needle coke is the main raw material for producing super-high power graphite electrodes. The growth rate of needle coke demand in China has always been higher than the international average, and the market demand is large.

[0060] This example takes a petrochemical enterprise producing 100000 tons of needle coke per year as an example, and the relevant parameters are as follows: raw needle coke demand 128160 t / a, calcination annual operation days 330 days, rotary kiln annual operation rate 90%, material residence time average 75 min, rotary kiln raw needle coke average feeding amount 10259.05 kg / h, raw needle coke moisture content 8%, fuel average consumption 608.74 kg / h, rotary kiln carbon loss 5%, rotary kiln actual recovery rate 78%, true density ≥2.13 g / cm 3 , coefficient of thermal expansion (CTE) ≤2.3*10 -6 / ℃, etc.

[0061] According to the above parameters, the enterprise's surplus oxygen 60 standard cubic meters / hour is used to designFigure 5 Process: The high-temperature gas in the rotary kiln is extracted by the rotary kiln gas ejector 2, mixed, and stabilized by the rotary kiln oxygen-enriched pressure tank 11 to obtain the designed oxygen-enriched flow, concentration, temperature, and pressure, and then sent to the most oxygen-enriched part of the rotary kiln through the rotary kiln oxygen-enriched nozzle, so that the fuel is fully burned to release more effective heat and the product absorbs it as soon as possible, thereby achieving the comprehensive purposes of energy saving, emission reduction, yield increase, and efficiency improvement. After implementation, the annual operation rate of the rotary kiln can be increased by about 5%, energy saving by about 10%, carbonaceous burning loss in the rotary kiln by about 20%, needle coke quality significantly improved, rotary kiln actual yield increased by about 5%, oxygen content in flue gas and CO decreased by 21% and 32% respectively, and average flue gas dust content decreased by 11.5%.

[0062] Example Four: A VPSA precise oxygen enrichment and combustion supporting system for a lime rotary kiln

[0063] Lime is widely used, and this example takes 8 lime rotary kilns of a certain steel group as an example. The relevant parameters are as follows: the average running time last year was 330 days, the total amount of mixed gas consumed by the 8 lime rotary kilns was 432 million cubic meters, the total amount of products was 1.728 million tons, the lime activity was ≥350 mL (4NHCL, 10 min), the average low heat value of mixed gas was 4060 Kcal / standard cubic meter, the average flue gas temperature was 121.6℃, the average O2 content in flue gas was 12.8%, the average CO was 130 ppm, and the flue gas dust content was 9.5 mg / m 3 , etc.

[0064] According to the above parameters, a VPSA oxygen production process with 8 lime rotary kilns is designed, and the process is shown in Figure 6 . This process not only has less investment, less land occupation, and fewer management personnel, but also is easier to operate: the oxygen-enriched air flow can be optimized according to the operation of each rotary kiln to ensure better energy saving, emission reduction, yield increase, and efficiency improvement. The oxygen-enriched flow is 1000 standard cubic meters / hour, the concentration is 80%, and the high-quality oxygen-enriched air is sent to the burning zone of the rotary kiln through the oxygen-enriched regulating valve 33 and the rotary kiln oxygen-enriched nozzle, which not only makes the fuel burn more completely and releases more effective heat, but also makes the clinker absorb it as soon as possible, thereby improving the quality of the clinker. The main effects are as follows: due to complete fuel combustion, the kiln condition is relatively stable, the ring formation is significantly reduced, the average running time is increased by about 10 days, the active lime output is increased by about 5%, the energy consumption per ton of product is reduced by about 6%, the lime activity is increased by about 20 mL (4NHCL, 10 min), the lime quality pass rate is increased by 3.5%, the temperature is reduced by 8.5℃, the oxygen content is reduced by 33.5%, the CO is reduced by 35.1%, and the smoke dust is reduced by about 10.8%; not only the annual efficiency is increased by more than 10 million yuan, but also the annual energy saving is about 15,000 tons (standard coal), the CO2 emission reduction is about 23,000 tons, and the rotary kiln ignition time is reduced by about 5.6%.

[0065] Embodiment five: a VPSA precision oxygen-increasing and combustion-aiding system for an alumina rotary kiln

[0066] Alumina is widely used. This embodiment takes six alumina rotary kilns in an aluminum plant as an example. The relevant parameters are as follows: the average running time last year was 304 days, the total amount of fuel gas consumed by the six kilns was 263 million cubic meters, the total amount of products was 3.105 million tons, the average low heat value of fuel gas was 8000 Kcal / m3, the average operation rate of the kiln was 85.7%, the average exhaust gas temperature was 148.6℃, the average O2 content in the flue gas was 3.8%, and the average dust content in the flue gas was 9.5 mg / m3. 3 and so on.

[0067] According to the above parameters, a VPSA oxygen production process is designed, and the process is similar to the process of the six alumina rotary kilns Figure 6 . This process not only has less investment, less land occupation, fewer management personnel, but also is easier to operate: the oxygen-rich air flow can be optimized according to the operation of each rotary kiln to ensure better effects such as energy saving, emission reduction, yield increase, and efficiency improvement of each rotary kiln. The oxygen-rich air flow is 1300 m3 / h, the concentration is 80%, the high-quality oxygen-rich air is sent to the firing zone of the rotary kiln through the oxygen-rich air regulating valve 33 and the rotary kiln oxygen-rich air nozzle, which not only makes the fuel burn more fully and releases more effective heat, but also makes the clinker absorb as soon as possible, so that the clinker quality is better. The main effects are as follows: due to complete combustion of the fuel, the kiln condition is relatively stable, the ring formation is significantly reduced, the average running time is increased by about 15 days, the alumina yield is increased by about 5%, the energy consumption per ton of product is reduced by about 5%, the dust is reduced by about 7%, not only the annual benefit is increased by more than 200 million yuan, but also the energy saving amount is about 12,000 tons (standard coal) per year, the CO2 emission reduction amount is about 25,000 tons per year, and the rotary kiln ignition time is reduced by about 5.2%.

[0068] In the description of the present document, it should be understood that the terms "upper", "lower", "left", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0069] In the description of the present specification, the description referring to the terms "an embodiment", "an example", and the like means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0070] In addition, it should be understood that although the present specification describes the embodiments in a specific manner, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that the skilled person can understand.

[0071] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present application and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations here, those skilled in the art can think of other specific embodiments of the present application without having to exert creative labor, and these ways will fall within the scope of protection of the present application.

Claims

1. A precision oxygen-enriched combustion system for rotary kilns, characterized by: energy saving, emission reduction, production increase, and efficiency improvement. The system includes a rotary kiln high-temperature gas collecting device, a rotary kiln gas ejector, and a rotary kiln oxygen-enriching nozzle. The rotary kiln oxygen-enriching nozzle and the rotary kiln high-temperature gas collecting device are respectively connected to the rotary kiln gas ejector. One end of the rotary kiln high-temperature gas collecting device, away from the rotary kiln gas ejector, is connected to the rotary kiln head hood. High-temperature gas inside the rotary kiln head hood enters the rotary kiln gas ejector through the rotary kiln high-temperature gas collecting device. The rotary kiln gas ejector is also connected to an oxygen source. Oxygen from the oxygen source is mixed inside the rotary kiln gas ejector, and the mixed gas is introduced into the rotary kiln oxygen-enriching nozzle. An installation hole is provided on the rotary kiln head hood, and the rotary kiln oxygen-enriching nozzle passes through the installation hole. The rotary kiln oxygen-enriching nozzle includes a nozzle body and a connecting hose. The two ends of the connecting hose are respectively connected to the nozzle body and the rotary kiln gas ejector. One end of the nozzle body is located at... Inside the rotary kiln, one end is located outside the mounting hole. Four lifting rings are evenly distributed around the outer periphery of the nozzle body located outside the mounting hole. Two of the symmetrical lifting rings are adjustment rings used to adjust the angle of the rotary kiln oxygen-enriched nozzle, and the other two are fixing rings used to fix the rotary kiln oxygen-enriched nozzle. A fixing steel pipe is also provided on the outer horizontal surface of the rotary kiln. The fixing steel pipe is detachably connected to the hook via a hook-joint. The nozzle body can rotate along the central axis of the nozzle body. The hook is connected to one of the fixing rings to fix the nozzle body. The rotary kiln oxygen-enriched nozzle is flat-mouthed. The center line of the flat mouth of the rotary kiln oxygen-enriched nozzle, the center line of the burner on the rotary kiln, the center line of the thickest area of ​​clinker distribution in the rotary kiln, and the center line of the fixing ring are on the same plane. When the oxygen source is used for ignition of the rotary kiln, its oxygen concentration is not higher than 95%.

2. The precision oxygenation and combustion assist system for rotary kilns according to claim 1, characterized in that, The rotary kiln high-temperature gas collection device includes a rotary kiln high-temperature gas intake porous pipe, which is connected to the rotary kiln gas ejector. The gas inlet end of the rotary kiln high-temperature gas intake porous pipe is located inside the rotary kiln head cover. The gas inlet end of the rotary kiln high-temperature gas intake porous pipe is provided with a plurality of gas inlet holes, and the total area of ​​all the gas inlet holes is greater than the cross-sectional area of ​​the rotary kiln high-temperature gas intake porous pipe. The gas inlet holes are inclined, and the length direction of the gas inlet holes is consistent with the gas flow direction.

3. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 1, characterized in that, The connecting hose and the nozzle body are detachably connected via a hose coupling. When the hose coupling is tightened, the connecting hose and the nozzle body are fixed. Rotating the hose coupling loosens the nozzle body, allowing it to rotate.

4. The precision oxygenation and combustion assist system for rotary kilns according to claim 1, characterized in that, When the oxygen source is an atmospheric pressure oxygen source, the rotary kiln gas ejector is connected to the rotary kiln oxygen-enriching nozzle through the rotary kiln blower.

5. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 1, characterized in that, When the oxygen source is a high-pressure oxygen source, the rotary kiln gas ejector is directly connected to the rotary kiln oxygen-enriching nozzle.

6. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 2, characterized in that, The rotary kiln high-temperature gas collection device includes a rotary kiln gas intake main pipe and two rotary kiln branch pipes. The two branch pipes are respectively connected to the rotary kiln gas intake main pipe. The rotary kiln gas intake main pipe is connected to the rotary kiln through a rotary kiln high-temperature gas intake porous pipe. A rotary kiln gas intake thermometer is installed on the rotary kiln gas intake main pipe to detect the temperature of the gas inside the rotary kiln gas intake main pipe. The two branch pipes are respectively connected to the rotary kiln gas ejector. Each branch pipe is equipped with a rotary kiln branch pipe switch valve and a rotary kiln filter. The rotary kiln branch pipe switch valve is used to control the flow rate of the gas inside the branch pipe, and the rotary kiln filter is used to filter the gas inside the branch pipe.

7. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 6, characterized in that, The rotary kiln high-temperature gas collection device also includes a rotary kiln suction pipe. One end of the rotary kiln suction pipe is connected to the rotary kiln gas intake main pipe, and the other end is connected to the outside. A rotary kiln control valve is provided on the rotary kiln suction pipe, which is used to control the flow rate of gas in the rotary kiln suction pipe.

8. The precision oxygenation and combustion assist system for rotary kilns according to claim 1, characterized in that, It also includes a rotary kiln oxygen-enriched pressure stabilizing tank, wherein the rotary kiln gas ejector is connected to the rotary kiln oxygen-enriched nozzle through the rotary kiln oxygen-enriched pressure stabilizing tank, and the rotary kiln oxygen-enriched pressure stabilizing tank is used to stabilize the oxygen-enriched pressure flowing into the rotary kiln oxygen-enriched nozzle.

9. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 8, characterized in that, It also includes a rotary kiln oxygen supply pipe. The rotary kiln oxygen-enriched pressure stabilizing tank is connected to the rotary kiln oxygen-enriched nozzle through the rotary kiln oxygen supply pipe. The rotary kiln oxygen supply pipe is equipped with a rotary kiln regulating valve, a rotary kiln flow meter, a rotary kiln micro-pressure gauge, and a rotary kiln oxygen supply pipe temperature gauge. The rotary kiln regulating valve is used to adjust the flow rate of the gas in the rotary kiln oxygen supply pipe. The rotary kiln flow meter, the rotary kiln micro-pressure gauge, and the rotary kiln oxygen supply pipe temperature gauge are used to measure the flow rate, pressure, and temperature of the gas in the rotary kiln oxygen supply pipe, respectively.

10. The energy-saving, emission-reducing, production-increasing, and efficiency-enhancing precision oxygen-enriched combustion system for rotary kilns according to claim 1, characterized in that, It also includes a decomposition furnace gas ejector, a decomposition furnace high-temperature gas collection device, and a decomposition furnace oxygen-enriched nozzle assembly. The decomposition furnace is connected to the rotary kiln head hood via a tertiary air duct. The decomposition furnace high-temperature gas collection device, the oxygen source, and the decomposition furnace oxygen-enriched nozzle assembly are respectively connected to the decomposition furnace gas ejector. The end of the decomposition furnace high-temperature gas collection device away from the decomposition furnace gas ejector is connected to the tertiary air duct. High-temperature gas in the tertiary air duct enters the decomposition furnace gas ejector through the decomposition furnace high-temperature gas collection device. The decomposition furnace gas ejector is also connected to the oxygen source. The oxygen-enriched gas from the oxygen source enters the decomposition furnace gas ejector and mixes with the high-temperature gas inside the decomposition furnace gas ejector. The mixed gas is injected into the decomposition furnace through the decomposition furnace oxygen-enriched nozzle assembly. The decomposition furnace high-temperature gas collection device includes a decomposition furnace gas intake main pipe switch valve, a decomposition furnace gas intake main pipe, and two decomposition furnace branch pipes. The decomposition furnace gas intake main pipe is connected to the decomposition furnace gas ejector. The air inlet of the pipe is located inside the tertiary air duct. The main gas intake valve of the decomposition furnace is installed on the tertiary air duct. Two branch pipes of the decomposition furnace are respectively connected to the main gas intake valve of the decomposition furnace. A decomposition furnace oxygen supply pipe thermometer is installed on the main gas intake valve of the decomposition furnace. The decomposition furnace oxygen supply pipe thermometer is used to detect the temperature of the gas in the main gas intake valve of the decomposition furnace. The ends of the two branch pipes of the decomposition furnace away from the main gas intake valve of the decomposition furnace are respectively connected to the gas ejector of the decomposition furnace. Each of the two branch pipes of the decomposition furnace is equipped with a branch pipe switch valve and a filter. The branch pipe switch valve is used to control the flow rate of the gas in the branch pipe of the decomposition furnace. The filter is used to filter the high-temperature tertiary air in the branch pipe of the decomposition furnace. The decomposition furnace is equipped with an RDF feed cylinder and a pulverized coal injection pipe. The decomposition furnace oxygen-enriched nozzle group includes multiple oxygen-enriched nozzles of the decomposition furnace. Each RDF feed cylinder and each pulverized coal injection pipe is equipped with an oxygen-enriched nozzle of the decomposition furnace.

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