Cement hot raw material desulfurization device

Abstract

The utility model discloses a cement hot raw material desulfurization device which comprises a material taking device, a disperser, a cyclone separator, a circulating fan, a first spiral metering scale, a digester, a first conveying device, a powder bin, a second spiral metering scale and a second conveying device, taking out the high-temperature solid hot raw material from a C5-grade cyclone cylinder blanking pipe by using a material taking device; mixing the taken-out hot raw material with airflow in a disperser for primary cooling, then entering a separator for gas-solid separation and secondary cooling at the same time, metering the low-temperature hot raw material, adding the low-temperature hot raw material into a digester for digestion reaction, and conveying the digested material into a powder bin for temporary storage; materials in the powder bin are metered and then fed into the first air pipe through the second conveying device for desulfurization treatment. The device can adapt to the working condition with large SO2 concentration fluctuation, and is high in desulfurization efficiency, small in desulfurizer usage amount, stable in desulfurization effect, small in influence on a preheater system and low in energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cement hot raw material desulfurization devices. BACKGROUND

[0002] SO2 pollutants generated by cement production mainly come from two parts, one part from raw material, and one part from fuel. Sulfur in raw materials mainly exists in the form of organic sulfide, sulfide or sulfate; Sulfate in raw materials usually does not form SO2 in the preheater system, and most of them enter the kiln system. Sulfide and organic sulfur in raw material generate SO2 at 400-600 ℃ temperature and are discharged with waste gas. Traditional cement kiln flue gas desulfurization technology mainly includes wet desulfurization, dry desulfurization and semi-dry desulfurization, etc. Wet desulfurization technology, such as limestone-gypsum wet desulfurization, although has high desulfurization efficiency, can reach more than 90%, but this method has the disadvantages of large equipment, high investment cost, need to consume a large amount of water resources during operation and easy to produce secondary pollution of waste water, etc. At the same time, the flue gas temperature after wet desulfurization is low, usually needs to be reheated to meet the chimney emission requirements, which further increases the energy consumption and operation cost.

[0003] Dry desulfurization technology, such as circulating fluidized bed dry desulfurization process with calcium-based desulfurizer, although has the advantages of simple system, small land occupation, no waste water discharge, etc., but its desulfurization efficiency is relatively low, generally around 80-85%, which is difficult to meet the current increasingly high environmental protection emission standards. Moreover, the contact time of desulfurizer with flue gas is limited in the process of dry desulfurization, the reaction is not sufficient enough, which leads to low utilization rate of desulfurizer, and a large amount of desulfurizer needs to be supplemented, which increases the operation cost.

[0004] Semi-dry desulfurization technology is between wet and dry methods, for example, rotary spray semi-dry desulfurization, which overcomes some of the shortcomings of wet desulfurization to some extent, but still has problems such as easy scaling and plugging of equipment, poor adaptability to flue gas flow and composition changes, etc., which brings challenges to the stable operation of the system, and frequent equipment maintenance and repair are needed, which affects the normal production of cement plant.

[0005] In addition, the existing desulfurization technology has insufficient adaptability to the large fluctuation of SO2 concentration under different working conditions when treating waste gas of cement plant. When producing different varieties of cement or adjusting the production process, the SO2 concentration in the kiln tail flue gas may change in a large range, and the traditional desulfurization process is difficult to quickly and effectively adjust the desulfurization operating parameters, which leads to unstable desulfurization effect, and sometimes SO2 emission exceeds the standard.

[0006] In summary, the existing desulfurization technology of cement plant still has the problem of being difficult to meet the requirements of high-efficiency desulfurization, low-cost operation, stable and reliable operation, and adaptability to complex working conditions, etc. SUMMARY

[0007] In order to solve the above technical problems, the utility model provides a cement hot raw material desulfurization device.

[0008] The utility model discloses a technical scheme:

[0009] A cement hot raw material desulfurization device, including taking material device, disperser, cyclone separator, circulating fan, first helical metering scale, digester, first conveying device, powder bin, second helical metering scale and second conveying device, taking material device is used for taking out high temperature solid hot raw material from C5 grade cyclone downcomer, disperser is used for mixing the high temperature solid hot raw material with airflow and carries out primary cooling, cyclone separator is used for separating gas and solid of mixed hot raw material and using atomizing water to carry out secondary cooling, circulating fan is used for conveying the gas separated from the top of cyclone separator to disperser and mixing with high temperature hot raw material and carrying out primary cooling, first helical metering scale is used for adding the low temperature hot raw material separated from the bottom of cyclone separator to digester after metering, digester is used for the digestion reaction of low temperature hot raw material, first conveying device is used for conveying the material in digester to powder bin, second helical metering scale and second conveying device are used for conveying the material in powder bin to the first air pipe of C2 cyclone separator to C1 cyclone separator after metering and carrying out desulfurization treatment.

[0010] Further, C5 grade cyclone downcomer is communicated with disperser through taking material device, disperser has feed inlet, air inlet and discharge port, disperser feed inlet is communicated with taking material device through pipeline, disperser discharge port is communicated with cyclone separator through pipeline, cyclone separator top gas outlet is communicated with circulating fan through air pipe, and circulating fan is communicated with disperser air inlet through air pipe, cyclone separator discharge port is communicated with digester through first helical metering scale, digester outlet is communicated with powder bin through first conveying device, and powder bin discharge port is communicated with first air pipe through second helical metering scale and second conveying device in proper order.

[0011] Further, it further includes dust collector and tail exhaust fan, and the dust collector inlet is communicated with the circulating fan outlet through the air pipe, and the tail exhaust fan inlet is communicated with the dust collector outlet.

[0012] Further, it further includes digestion fan, and the digestion fan is connected with the filter outlet in the digester.

[0013] Further, taking material device includes three-way taking material pipe and rotary feeding valve, the inlet of three-way taking material pipe is communicated with C5 grade cyclone downcomer, the first outlet of three-way taking material pipe is communicated with smoke chamber, and the second outlet is communicated with the inlet of rotary feeding valve.

[0014] Further, the disperser comprises a straight cylinder with a neck in the middle, the top of the straight cylinder forms a discharge port, and the bottom forms an air inlet; a feeding pipe is arranged on the upper part of the straight cylinder, the top of the feeding pipe forms a feeding port, and the inner surface of the lower end of the feeding pipe is provided with a material distribution plate, which is distributed on the lower side of the inner surface of the feeding pipe in a radial manner.

[0015] Further, the cyclone separator is connected with the first screw metering scale through a double-layer air lock valve.

[0016] Further, a spray gun is arranged around the middle part of the cyclone separator, and the spray gun is used for spraying atomized water into the cyclone separator.

[0017] The beneficial effects of the utility model are as follows:

[0018] 1. The material is taken from the discharge pipe of the C5 grade cyclone cylinder for cooling, the heat loss of the system is small, and the influence on the preheater system is small.

[0019] 2. The material is dispersed into the circulating gas flow for primary cooling, the circulating gas amount is small, and the energy consumption of the dispersed gas flow is low.

[0020] 3. The gas-solid mixed material is cooled by the atomized water through a separation method, the evaporation phase change heat absorption of water is fully utilized, compared with the method that the hot raw material is collected and then cooled by cooling water, the use amount of the cooling water can be effectively reduced, the heat load of the circulating cooling water tank is greatly reduced, the energy consumption is greatly saved, and the cooling load of the circulating water is reduced.

[0021] 4. The Ca(OH) 2， reacts with SO2, the reaction activity is better, SO2 solidification and absorption are easier to realize, the desulfurization efficiency is high, and the desulfurizer usage amount is small.

[0022] 5. The utility model can adapt to the working condition that the SO2 concentration fluctuates greatly, and the desulfurization effect is stable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a cement hot raw material desulfurization device structure diagram of the utility model.

[0024] Figure 2 It is a disperser structure diagram of the utility model.

[0025] Figure 3 It is Figure 2 a B-B sectional view of the utility model.

[0026] In the figure: 1, three-way material taking pipe; 2, plug valve; 3, compressed air ring blowing; 4, rotary feeding valve; 5, disperser; 6, cyclone separator; 7, double-layer air lock valve; 8, first screw metering scale; 9, digester; 10, screw conveyor; 11, air lock feeder; 12, FU chain conveyor; 13, circulating fan; 14, dust collector; 15, tail exhaust fan; 16, digestion fan; 17, bucket elevator; 18, powder bin; 19, second screw metering scale; 20, kiln feeding bucket; 51, straight cylinder; 52, feeding pipe; 53, material scattering plate; 501, feeding port; 502, discharging port; 503, air inlet; 511, upper straight cylinder part; 512, necking; 513, lower straight cylinder part. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings and a preferred embodiment.

[0028] Referring to Figures 1-3 The utility model provides a kind of desulfurization device, including three-way material taking pipe 1, plug valve 2, rotary feeding valve 4, disperser 5, cyclone separator 6, first screw metering scale 8, digester 9, screw conveyor 10, air lock feeder 11, FU chain conveyor 12, circulating fan 13, dust collector 14, tail exhaust fan 15, digestion fan 16, bucket elevator 17, powder bin 18, second screw metering scale 19 and kiln feeding bucket 20.

[0029] Three-way material taking pipe 1, plug valve 2, rotary feeding valve 4 are sequentially connected to form material taking device, three-way material taking pipe 1 is installed below C5 grade cyclone lower discharge pipe, the inlet of three-way material taking pipe is communicated with C5 grade cyclone lower discharge pipe, the first outlet of three-way material taking pipe is communicated with smoke chamber, the second outlet is communicated with the inlet of plug valve 2, the outlet of plug valve 2 is communicated with the inlet of rotary feeding valve 4.Solid hot raw material in C5 grade cyclone lower discharge pipe flows into rotary feeding valve 4 under the action of gravity, and the amount of material taken is controlled by rotary feeding valve 4.The inlet end of rotary feeding valve 4 is equipped with compressed air ring blowing 3, and compressed air is used to assist flow of material pipe above rotary feeding valve 4, to promote material flow and avoid material blockage.

[0030] Disperser 5 includes straight cylinder 51 with necking in middle, i.e. straight cylinder 51 is composed of upper straight cylinder part 511, middle necking 512 and lower straight cylinder part 513, the top of straight cylinder forms discharging port 502, and the bottom forms air inlet 503; upper straight cylinder part 511 is obliquely connected with feeding pipe 52, the top of feeding pipe forms feeding port 501, the inner surface of lower end of feeding pipe is equipped with material scattering plate 53, and material scattering plate 53 is distributed on the lower side of inner surface of feeding pipe in radial manner.The setting of middle necking 512 can improve the flow rate of gas, improve the dispersing effect of hot raw material, and avoid hot raw material sliding.

[0031] The feed inlet 501 of the disperser 5 is connected by a pipeline to the outlet of the rotary feeder valve 4, the discharge outlet 502 is connected by a pipeline to the feed inlet of the cyclone separator 6, and the cyclone separator top gas outlet is connected by an air duct to the circulating fan 13.

[0032] A spray gun is arranged around the middle part of the cyclone separator 6, which is used to spray atomized cooling water into the interior of the separator.

[0033] The outlet of the circulating fan 13 is divided into two routes, one of which is connected to the disperser 5 to provide a dispersion gas flow for the disperser 5. The temperature of this gas flow is much lower than that of the hot raw material, and the gas composition is a mixture of air and water vapor. This gas flow has a high flow rate in the disperser 5, and when it comes into contact with the hot raw material dispersed by the disperser 6, it can accelerate the hot raw material in a very short time and at the same time realize heat exchange. Due to the high dispersion performance of the disperser 5, the amount of gas required by the disperser 5 can be minimized, thereby reducing the power consumption of the circulating fan 13 and reducing the operating energy consumption of the system.

[0034] The other route of the outlet of the circulating fan 13 is connected to the dust collector 14, and the outlet of the dust collector 14 is connected to the tail exhaust fan 15. The gas containing water is discharged from the desulfurization system by the tail exhaust fan 15 as needed. The volume of the discharged system gas is the volume of the system air leakage and the atomized water vaporized by the atomized water sprayed into the cyclone separator 6, which can be judged by pressure balance in the system, that is, a pressure gauge is arranged at the outlet of the circulating fan 13 to detect the pressure. When the outlet pressure of the circulating fan 13 is too high, it means that the circulating gas volume in the system is too large, and the frequency of the tail exhaust fan 15 can be increased to increase the exhaust volume until the outlet pressure of the circulating fan 13 reaches the set value. When the outlet pressure of the circulating fan 13 is too low, it means that the circulating gas volume in the system is too low, and the frequency of the tail exhaust fan 15 can be reduced to reduce the exhaust volume until the outlet pressure of the circulating fan 13 reaches the set value.

[0035] The lower discharge outlet of the cyclone separator 6 is connected by a pipeline to the double-layer air lock valve 7, the outlet of the double-layer air lock valve 7 is connected by a pipeline to the first screw metering scale 8, the outlet of the first screw metering scale 8 is connected by a pipeline to the digester 9, and the digester 9 is provided with a dust collector and a digestion water spraying unit. The outlet of the dust collector is connected by an air duct to the digestion fan 16. The digestion water spraying unit is used to spray digestion water into the digester.

[0036] The outlet of the digester 9 is connected to the screw conveyor 10 via a pipe. The outlet of the screw conveyor 10 is equipped with an airlock feeder 11. The airlock feeder 11 is connected to the FU chain conveyor 12 via a pipe. The outlet of the FU chain conveyor 12 is connected to the bucket elevator 17. The outlet of the bucket elevator 17 is connected to the powder silo 18. The outlet of the powder silo 18 is connected to the second screw weighing scale 19. The outlet of the second screw weighing scale 19 is connected to the kiln inlet bucket elevator 20 via a pipe. The outlet of the kiln inlet bucket elevator is connected to the first air duct.

[0037] The screw conveyor 10, the airlock feeder 11, the FU chain conveyor 12, and the bucket elevator 17 constitute the first conveying device; the kiln inlet bucket elevator 20 serves as the second conveying device.

[0038] The process method for desulfurizing cement hot raw materials using the desulfurization device of this utility model is as follows:

[0039] (1) A material handling device is used to remove high-temperature solid hot raw material from the feed pipe of the C5 grade cyclone;

[0040] (2) The high-temperature hot raw material extracted by the material handling device enters the disperser 5 through the feed pipe 52. Under the action of the spreading plate 53, it enters the airflow from the air inlet 503 in a dispersed state, mixes fully with the airflow and moves with the airflow, and is discharged from the outlet 502. During the mixing process, the high-temperature hot raw material and the airflow exchange heat, the temperature drops, and a cooling is completed.

[0041] (3) The hot raw material after the first cooling and the airflow flow together into the cyclone separator 6 at high speed. In the cyclone separator 6, it is fully mixed with the atomized cooling water and heat exchanged to achieve the second cooling of the hot raw material. The cooled hot raw material is separated from the airflow under the action of the separator and discharged from the bottom outlet of the separator. The atomized water absorbs heat and vaporizes into water vapor, which is discharged from the top outlet of the separator with the gas that has completed the heat exchange and enters the circulating fan 13.

[0042] The circulating fan 13 delivers a portion of the gas to step (2) to mix with the high-temperature hot raw material for a cooling process, while the other portion of the gas is delivered to the dust collector. After being filtered by the dust collector, the gas is discharged from the desulfurization system through the tail exhaust fan.

[0043] (4) The hot raw material discharged from the lower outlet of the cyclone separator 6 is discharged into the first spiral weighing scale 8 through the double-layer airlock valve 7. After being weighed in the spiral weighing scale 8, it is discharged into the digester 9. The calcium oxide in the hot raw material reacts fully with the sprayed water to generate calcium hydroxide. The water vapor generated during the reaction is extracted by the digestion blower 16, filtered by the dust collector installed in the digester 9, and discharged from the desulfurization system. The amount of sprayed water is given quantitatively according to the weight of the hot raw material weighed by the spiral weighing scale.

[0044] (5) The digested hot raw material is fed into the powder silo 18 by the first conveying device for temporary storage;

[0045] (6) The material stored in the powder bin 18 is fed into the raw material feeding hopper 20 in the kiln tail through the second screw feeding scale 19, and is transported into the first air pipe C2-C1 together with the raw material in the feeding hopper, and is rapidly dispersed and fully mixed with the air flow under the action of high-speed air flow in the air pipe, and reacts with SO2 in the air flow to absorb SO2;

[0046] The measurement value of the second screw scale 19 is dynamically controlled by the sulfur value detected by the sulfide detection device in the preheater system, and the amount of the digestion hot raw material fed is increased when the sulfur value is increased, and the amount of the digestion hot raw material fed is decreased when the sulfur value is decreased, so as to keep the sulfur content discharged by the system in the required range.

[0047] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements are also within the scope of the present application.

Claims

1. A cement hot raw material desulfurization device, characterized in that, It includes a material handling device, a disperser, a cyclone separator, a circulating fan, a first spiral weighing scale, a digester, a first conveying device, a powder silo, a second spiral weighing scale, and a second conveying device; The material handling device is used to remove high-temperature solid raw materials from the C5 grade cyclone discharge pipe; The disperser is used to mix the extracted high-temperature solid raw material with the airflow for a primary cooling process; Cyclone separators are used to separate hot raw materials mixed with gas into solids, while using atomized water for secondary cooling. The circulating fan is used to transport the gas separated from the top of the cyclone separator to the disperser to mix with the high-temperature raw material for primary cooling; The first spiral weighing scale is used to weigh the low-temperature hot raw material separated at the bottom of the cyclone separator and add it to the digester; Digesters are used for the digestion of low-temperature hot raw materials; The first conveying device is used to transport the material in the digester to the powder silo; The second spiral weighing scale and the second conveying device are used to weigh and convey the material in the powder silo to the first air duct of the C2 cyclone separator to the C1 cyclone separator for desulfurization treatment.

2. The cement hot raw material desulfurization device according to claim 1, characterized in that, The C5-grade cyclone separator's feed pipe is connected to a disperser via a material handling device. The disperser has a feed inlet, an air inlet, and a discharge outlet. The disperser's feed inlet is connected to the material handling device via a pipe, and the disperser's discharge outlet is connected to a cyclone separator via a pipe. The top air outlet of the cyclone separator is connected to a circulating fan via an air duct, and the circulating fan is connected to the disperser's air inlet via an air duct. The cyclone separator's discharge outlet is connected to a digester via a first spiral weighing scale, and the digester's outlet is connected to a powder silo via a first conveying device. The powder silo's discharge outlet is connected to the first air duct via a second spiral weighing scale and a second conveying device.

3. The cement hot raw material desulfurization device according to claim 2, characterized in that, It also includes a dust collector and an exhaust fan. The dust collector inlet is connected to the circulating fan outlet through a duct, and the exhaust fan inlet is connected to the dust collector outlet.

4. A cement hot raw material desulfurization device according to claim 2, characterized in that, It also includes a digestion fan, which is connected to the outlet of the filter inside the digester.

5. A cement hot raw material desulfurization device according to claim 1, characterized in that, The material handling device includes a three-way material handling pipe and a rotary feed valve. The inlet of the three-way material handling pipe is connected to the discharge pipe of the C5 grade cyclone separator. The first outlet of the three-way material handling pipe is connected to the smoke chamber, and the second outlet is connected to the inlet of the rotary feed valve.

6. A cement hot raw material desulfurization device according to claim 1, characterized in that, The disperser includes a straight cylinder with a constricted middle section, a discharge port at the top of the cylinder and an air inlet at the bottom; a feed pipe is provided at the upper part of the straight cylinder, a feed port at the top of the feed pipe, and a spreading plate is provided on the inner surface of the lower end of the feed pipe, the spreading plate being radially distributed on the lower side of the inner surface of the feed pipe.

7. A cement hot raw material desulfurization device according to claim 1, characterized in that, The cyclone separator is connected to the first spiral weighing scale via a double-layer airlock valve.

8. A cement hot raw material desulfurization device according to claim 1, characterized in that, A spray gun is installed in the middle of the cyclone separator, which is used to spray atomized water into the cyclone separator.

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