CN219301280U - Environment-friendly system of alternative fuel for cement production - Google Patents

Abstract

The utility model discloses an environment-friendly system for replacing fuel for cement production, which relates to the technical field of replacing fuel for cement industry and comprises a drying system and an exhaust gas innocent treatment system, wherein the drying system is provided with a feed inlet for conveying the replacing fuel, an air inlet for conveying hot air, a drying exhaust gas outlet and a pneumatic conveying pipeline for conveying the replacing fuel after drying, the exhaust gas innocent treatment system comprises a condensing tower and a grate cooler system, an air inlet of the condensing tower is communicated with the drying exhaust gas outlet, a cold air inlet of the grate cooler is communicated with an air outlet of the condensing tower, and a hot air outlet of the grate cooler is communicated with the air inlet for conveying hot air. According to the utility model, the drying system is used for drying the alternative fuel, the gas-material separation is carried out, the dried alternative fuel is used for the fuel of the cement sintering system, the separated waste gas is cooled and dehydrated, and the waste gas is transferred into the cement sintering system through the grate cooler to digest harmful substances in the waste gas, so that the substitution rate of kiln head fuel is improved, the harmless treatment of the waste gas is realized, and the carbon reduction and environmental protection are realized.

Description

Environment-friendly system of alternative fuel for cement production

Technical Field

The utility model relates to the technical field of cement industry alternative fuels, in particular to an environment-friendly system of an alternative fuel for cement production.

Background

Under the background of double carbon, the utilization technology of alternative fuels has become one of important measures for carbon emission reduction in the cement industry, but the substitution rate of kiln head fuels is not high all the time under the limitation of water content of alternative fuels, the high-water alternative fuels are required to be dried, the water content of the alternative fuels is reduced, the alternative fuels are generally dried in a vertical cylinder, and the alternative fuels are pushed by hot air to be fully dried when rising along with hot air flow, so that a large amount of hot air is required to be conveyed, and harmful impurities are carried in the hot air dried by the alternative fuels, so that the emission of waste gas pollutes the atmosphere, and the current urgent need is how to effectively improve the substitution rate of the alternative fuels in the cement industry and achieve the effect of carbon reduction and environmental protection.

Chinese patent with the issued publication number CN212390854U discloses an alternative fuel treatment system, pneumatic conveying system for conveying materials; the hot air pipeline is used for conveying hot air; the vertical drying system comprises a vertical cylinder body, a third air outlet, a cyclone dust collector and a fourth discharging hole, wherein the vertical cylinder body is provided with a first connecting port for receiving materials from a pneumatic conveying system and a second connecting port for introducing hot air from a hot air pipeline, the position of the first connecting port is higher than that of the second connecting port, the third air outlet is positioned above the first connecting port and is used for guiding out the hot air and the dried materials upwards, the cyclone dust collector is connected with the third air outlet and comprises a fourth discharging hole positioned at the bottom and is used for discharging the materials; the bag type dust collector is connected with the fifth air outlet, the bag type dust collector further comprises a sixth air outlet and a seventh discharge hole positioned at the bottom, the bag type dust collector is used for carrying out secondary collection on residual materials in the drying air flow and sending the materials out of the seventh discharge hole, and the terminal conveying equipment is positioned below the fourth discharge hole and the seventh discharge hole and used for conveying the materials, the metering and feeding system is connected with the terminal conveying equipment and used for metering the materials and feeding the materials into the alternative fuel burner. However, this proposal does not disclose a system for treating exhaust gas after drying the alternative fuel, nor a system for supplying hot air required for the alternative fuel.

The application publication No. CN114704849A discloses a system and a method for replacing fuel by biomass in a cement kiln, wherein the system comprises a fuel joint storage workshop, the fuel joint storage workshop is connected with a primary drying device through a second conveying quantitative component, the primary drying device is connected with a first waste heat smoke channel, the primary drying device is connected with a secondary drying homogenizing bin, the secondary drying homogenizing bin is connected with a second waste heat smoke channel, the secondary drying homogenizing bin is connected with a third conveying quantitative component, the third conveying quantitative component is connected with a fourth conveying component, the fourth conveying component is respectively connected with a decomposing furnace and a precombustion furnace, and the precombustion furnace is connected with the decomposing furnace. However, this proposal does not disclose a system for treating exhaust gas after drying the alternative fuel, nor a system for supplying hot air required for the alternative fuel.

Disclosure of Invention

The utility model aims to provide an environment-friendly system for replacing fuel for cement production, which solves the problems in the prior art, the utility model dries the replacing fuel through a drying system, separates gas and material, uses the dried replacing fuel for fuel of a cement sintering system, cools and dehydrates separated waste gas, transfers the separated waste gas into the cement sintering system through a grate cooler to digest harmful substances in the waste gas, can improve the substitution rate of kiln head fuel, realizes harmless treatment of the waste gas, and reduces carbon and protects environment.

The utility model provides an environment-friendly system for replacing fuel for cement production, which comprises a drying system and an exhaust gas innocent treatment system, wherein the drying system is provided with a feed port for conveying the replacing fuel, an air inlet for conveying hot air, a drying exhaust gas outlet and a pneumatic conveying pipeline for conveying the replacing fuel after drying, the exhaust gas innocent treatment system comprises a condensing tower and a grate cooler system, the condensing tower is provided with an air inlet and an air outlet, the air inlet of the condensing tower is communicated with the drying exhaust gas outlet of the replacing fuel, the grate cooler is provided with a cold air inlet and a hot air outlet, the cold air inlet is communicated with the air outlet of the condensing tower, and the hot air outlet is communicated with the air inlet for conveying hot air by the drying system.

Preferably, the drying system comprises a vertical cylinder for circulating the alternative fuel, wherein the side wall of the vertical cylinder is provided with a feed inlet and an air inlet, the air inlet is arranged below the feed inlet, the vertical cylinder is provided with a necking section between the air inlet and the feed inlet, and the diameter of the necking section is smaller than that of the vertical cylinder.

Preferably, the necking section comprises a bottom reducing section, a straight section and a top reducing section which are coaxially communicated from bottom to top, wherein the top end of the bottom reducing section is connected with the bottom end of the straight section, and the top end of the straight section is connected with the bottom end of the top reducing section.

Preferably, the drying system further comprises a cyclone dust collector and a bag type dust collector, wherein one side of the top end of the cyclone dust collector is communicated with the tail end of the vertical cylinder, the other side of the top end of the cyclone dust collector is communicated with one side of the top end of the bag type dust collector, material outlets are respectively arranged at the bottom end of the cyclone dust collector and the bottom end of the bag type dust collector, and the other side of the top end of the bag type dust collector is provided with an exhaust gas outlet.

Preferably, the top end of the cyclone dust collector is provided with an explosion-proof valve, the body of the bag type dust collector is provided with an explosion-proof sheet, and the top end inlet and the waste gas outlet of the bag type dust collector are respectively provided with a stop valve.

Preferably, the drying system further comprises a metering and conveying system for weighing the materials before drying, a rotor scale for weighing the materials flowing out from the material outlet and a pneumatic conveying system for conveying the dried materials to a main burner of the cement kiln head.

Preferably, the waste gas innocent treatment system further comprises a bypass air release waste gas pipeline connected with the cement sintering system, a first pipeline is communicated with the bypass air release waste gas pipeline, a hot air outlet is formed in the grate cooler system, a second pipeline is communicated with the hot air outlet, the first pipeline and the second pipeline are connected at one end of a third pipeline in a converging mode, and the other end of the third pipeline is communicated with an air inlet for conveying hot air through the drying system.

Preferably, the third pipeline is externally connected with a first branch, the first branch is communicated with air, and the first branch is provided with a cold air valve.

Preferably, the grate cooler system is communicated with a rotary kiln, exhaust gas in the grate cooler circulates in the rotary kiln, and harmful substances in the exhaust gas are digested in the rotary kiln.

Preferably, a plurality of cooling fans are arranged on the grate cooler, one end of each cooling fan is communicated with the air outlet of the condensing tower, and the other end of each cooling fan is led into the grate cooler.

Compared with the prior art, the utility model has the following technical effects:

(1) According to the utility model, the drying system is arranged, the feeding hole and the air inlet are arranged on the drying system, the feeding hole is used for conveying the alternative fuel outside the system into the drying system, the air inlet is used for conveying hot air into the drying system, the alternative fuel is blown by the hot air, the drying of the alternative fuel is realized, the substitution rate of kiln head fuel can be improved, the drying system can be provided with hot air through the communication of the grate cooler and the air inlet, the waste heat utilization in the grate cooler is realized, the waste gas after the alternative fuel is dried is firstly led into the condensing tower for dehydration, the moisture content in the waste gas is reduced, and then the waste gas is treated as the cold air of the cooling fan of the grate cooler to be led into the cement firing system for treatment, so that harmful components in the waste gas are converted into harmless substances or solidified into clinker in the alkaline environment of the cement firing system, and the harmless treatment of the waste gas is realized, and the waste gas is reduced in carbon and environment is protected.

(2) According to the utility model, the side wall of the neutral cylinder is provided with the feed inlet and the air inlet, the air inlet is arranged below the feed inlet, the vertical cylinder is provided with the necking section between the air inlet and the feed inlet, and based on the necking section between the air inlet and the feed inlet, hot air passing through the necking section is relatively reduced in cross section area, the flow speed of the hot air is increased, so that the lifting force of alternative fuel entering into the feed inlet can be enhanced, the alternative fuel can be effectively ensured to smoothly rise along with hot air flow, the smooth circulation of the hot air in the necking section can be realized by respectively connecting the bottom reducing section and the top reducing section at the two ends of the straight section, and the resistance of rising hot air due to the sudden change of the cross section of the necking section relative to the cross section of the vertical cylinder is avoided while the flow speed of the hot air in the necking section is improved.

(3) According to the utility model, through the arrangement of the first pipeline, the second pipeline and the third pipeline, the bypass air discharge and the hot air of the waste heat in the grate cooler are fully utilized, the grate cooler is provided with a plurality of cooling fans, one ends of the cooling fans are communicated with the air outlet of the condensing tower, the other ends of the cooling fans are introduced into the grate cooler, and cold air of the cooling fans in the grate cooler is led to the cement firing system, so that harmful components in waste gas are converted into harmless substances or solidified into clinker in an alkaline environment of the cement firing system, and harmless treatment of the waste gas is realized.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings that are necessary for the embodiments will be briefly described below, it being evident that the drawings in the following description are only some embodiments of the utility model and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of an environment-friendly system for producing alternative fuels for cement production.

Wherein, 1, a receiving hopper; 2. a mechanical conveying and metering system; 3. a locking air valve; 4. a pneumatic conveying system; 5. a grate cooler; 501. a cooling fan; 6. a vertical cylinder; 7. a slag discharging system; 8. a cyclone dust collector; 9. a bag dust collector; 10. an exhaust gas fan; 11. a condensing tower; 12. a conveying device; 13. a buffer bin; 14. a rotor scale; 15. a stop valve; 16. an explosion-proof valve; 17. a cold air valve; 18. an air line; 19. a kiln head main burner; 20. a bypass vent exhaust gas line; 21. a rotary kiln; 22. a first pipeline; 23. a second pipeline; 24. a third pipeline; 25. a first branch; 26. a necking section; 27. and (5) clinker.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims to provide an environment-friendly system for replacing fuel for cement production, which solves the problems in the prior art, the utility model dries the replacing fuel through a drying system, separates gas and material, uses the dried replacing fuel for fuel of a cement sintering system, cools and dehydrates separated waste gas, and transfers the separated waste gas into the cement sintering system through a grate cooler 5 to digest harmful substances in the waste gas, thereby improving the substitution rate of kiln head fuel, realizing harmless treatment of the waste gas, reducing carbon and protecting environment.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1, the utility model provides an environment-friendly system for replacing fuel for cement production, which comprises a drying system for drying the replacing fuel and an exhaust gas innocent treatment system, wherein the drying system is provided with a feed port for conveying the replacing fuel, an air inlet for conveying hot air, a drying exhaust gas outlet and a pneumatic conveying pipeline for conveying the replacing fuel after drying, the exhaust gas innocent treatment system comprises a condensing tower 11 and a grate cooler system 5, the condensing tower 11 is provided with an air inlet and an air outlet, the air inlet of the condensing tower 11 is communicated with the drying exhaust gas outlet of the replacing fuel, the grate cooler 5 is provided with a cold air inlet and a hot air outlet, the cold air inlet is communicated with the air outlet of the condensing tower 11, the hot air outlet is communicated with the air inlet for conveying hot air of the drying system, the drying system is arranged, and the feed port and the air inlet are arranged on the drying system, the feed inlet is used for conveying the alternative fuel outside the system into the drying system, the air inlet is used for conveying hot air into the drying system, the alternative fuel is blown by the hot air, the drying of the alternative fuel is realized, the substitution rate of kiln head fuel can be improved, the hot air can be provided for the drying system by arranging the grate cooler 5 to be communicated with the air inlet for conveying the hot air by the drying system, the waste heat utilization in the grate cooler 5 is realized, the waste gas after the alternative fuel is dried is firstly introduced into the condensing tower 11 for dehydration, the moisture content in the waste gas is reduced, and then the waste gas is treated by the cold air of the cooling fan 501 in the grate cooler 5 as the cold air to be introduced into the cement burning system, so that harmful components in the waste gas are converted into harmless materials in the alkaline environment of the cement burning system or are solidified into clinker 27, and the harmless treatment of the waste gas is realized, and the carbon is reduced and environment is protected.

As shown in fig. 1, further, the drying system comprises a vertical cylinder 6 for circulating the alternative fuel, a feed inlet and an air inlet are formed on the side wall of the vertical cylinder 6, the air inlet is arranged below the feed inlet, a necking section 26 is arranged between the air inlet and the feed inlet of the vertical cylinder 6, the diameter of the necking section 26 is smaller than that of the vertical cylinder 6, when the alternative fuel is transported to a site by a transport vehicle, the alternative fuel is loaded and unloaded into a receiving hopper 1, the alternative fuel is transported to a pneumatic transportation system 4 by a mechanical transportation and metering system 2, a locking air valve 3 is arranged between the two systems, the locking air valve 3 can control cold air transported by pneumatic transportation to enter the pneumatic transportation system 4 without blowing to upstream equipment, the pneumatic transportation system 4 is connected with the feed inlet through a pipeline, an air pipeline 18 is injected at one end of the pneumatic transportation system 4, the alternative fuel is blown into the vertical cylinder 6, because the air inlet is arranged below the feed inlet, the alternative fuel entering the vertical cylinder 6 is pushed by the hot air blown by the lower part and continuously dried in the rising process, the alternative fuel with larger particles can fall into the slag discharging system 7 from the bottom end opening of the vertical cylinder 6, and the air locking valve 3 is arranged between the bottom end of the vertical cylinder 6 and the slag discharging system 7, in addition, the hot air passing through the necking section 26 is arranged on the basis of the arrangement of the necking section 26 between the air inlet and the feed inlet, the lifting force of the alternative fuel entering the feed inlet can be enhanced due to the relatively smaller cross section area of the necking section 26, the flow speed of the hot air is increased, the smooth rising of the alternative fuel along with the hot air flow is effectively ensured, preferably, the vertical cylinder 6 comprises a bottom reducing section, a straight section and a top reducing section which are coaxially communicated from bottom to top, the top end of the bottom reducing section is connected with the bottom end of the straight section, the top of straight section is connected with the bottom of top reducing section, through connecting bottom reducing section and top reducing section respectively at the both ends of straight section, can realize the smooth and easy circulation of hot-blast in necking down section 26, when improving the velocity of flow of hot-blast in necking down section 26, avoids increasing the resistance of rising hot-blast because of the cross section of necking down section 26 is suddenly changed relative to the cross section of vertical barrel 6.

As shown in fig. 1, further, the drying system further comprises a cyclone dust collector 8 and a bag dust collector 9, wherein one side of the top end of the cyclone dust collector 8 is communicated with the tail end of the vertical cylinder 6, the other side of the top end of the cyclone dust collector 8 is communicated with one side of the top end of the bag dust collector 9, the bottom end of the cyclone dust collector 8 and the bottom end of the bag dust collector 9 are respectively provided with a material outlet, the other side of the top end of the bag dust collector 9 is provided with an exhaust gas outlet, preferably, the top end of the cyclone dust collector 8 is provided with an explosion-proof valve 16, the body of the bag dust collector 9 is provided with an explosion-proof sheet, the top end inlet and the exhaust gas outlet of the bag dust collector 9 are respectively provided with a stop valve 15, the temperature or pressure is abnormal or the ignition is monitored, the stop valve 15 can be rapidly closed to protect the filter bag of the dust collector from being damaged, and the explosion-proof sheet of the bag dust collector 9 can release the pressure, the explosion-proof valve 16 above the cyclone 8 releases the pressure on the connecting pipeline, preferably, the drying system further comprises a metering and conveying system 2 for weighing the materials before drying and a rotor scale 14 for weighing the materials flowing out of the material outlet, the metering and conveying system 2 is mainly roughly metered and used for controlling parameters of the drying system, the rotor scale 14 is precisely metered and used for metering the amount of the alternative fuel and the heat statistics of the cement feeding firing system, the alternative fuel falling from the bottom end of the cyclone 8 and the material outlet of the bottom end of the bag type dust collector 9 is transmitted to the buffer bin 13 through the conveying equipment 12, and after passing through the rotor scale 14, the alternative fuel is transmitted to the alternative fuel channel of the kiln head main burner 19 by means of the pneumatic conveying system 4, so that the application of the alternative fuel after drying is realized.

As shown in fig. 1, further, the cement burning system further comprises a bypass air-releasing exhaust gas pipeline 20, the bypass air-releasing exhaust gas pipeline 20 is communicated with the first pipeline 22, a hot air outlet is arranged on the grate cooler 5, a second pipeline 23 is communicated with the hot air outlet, the first pipeline 22 and the second pipeline 23 are connected at one end of a third pipeline 24 in a converging manner, the other end of the third pipeline 24 is communicated with an air inlet of the drying system, preferably, the third pipeline 24 is externally connected with a first branch 25, the first branch 25 is communicated with the air pipeline 18, a cold air valve 17 is arranged on the first branch 25, cold air is doped according to requirements to adjust the temperature of drying hot air, and the hot air of the bypass air-releasing and the waste heat in the grate cooler 5 is fully utilized through the arrangement of the first pipeline 22, the second pipeline 23 and the third pipeline 24, preferably, the grate cooler system 5 is communicated with the rotary kiln 21, waste gas in the grate cooler 5 can be circulated, preferably, a plurality of cooling fans 501 are arranged on the grate cooler 5, one end of the cooling fans 501 is communicated with an air outlet of the condensing tower 11, the other end of the cooling fans is communicated with the cooling fans 5, and the waste gas is led into the grate cooler 5, and the waste gas is burned into the kiln system, and the waste gas is converted into harmless waste gas, and the harmless waste gas is burned into the cement, and the harmless waste gas is in the environment, and is burned into the waste gas, and is in the environment, and is cured, and the waste gas is not harmful.

The adaptation to the actual need is within the scope of the utility model.

It should be noted that it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. The utility model provides an environment-friendly system of alternative fuel for cement manufacture, its characterized in that, including drying system and the waste gas innocent treatment system that is used for drying alternative fuel, be provided with on the drying system and carry the feed inlet of alternative fuel, carry hot-blast air intake, stoving waste gas export and carry the pneumatic conveying pipeline of alternative fuel after the stoving, waste gas innocent treatment system includes condensing tower and comb cold machine system, the condensing tower is provided with air inlet and gas outlet, the air inlet of condensing tower with alternative fuel stoving waste gas export intercommunication, be provided with cold wind import and hot-blast export on the comb cold machine, the cold wind import with the gas outlet intercommunication of condensing tower, the hot-blast export with the air intake intercommunication of drying system transportation hot-blast.

2. The environment-friendly system for producing the alternative fuel for the cement production according to claim 1, wherein the drying system comprises a vertical cylinder for circulating the alternative fuel, the side wall of the vertical cylinder is provided with the feed inlet and the air inlet, the air inlet is arranged below the feed inlet,

the vertical cylinder is provided with a necking section between the air inlet and the feeding inlet, and the diameter of the necking section is smaller than that of the vertical cylinder.

3. The system of claim 2, wherein the neck section comprises a bottom reducing section, a straight section and a top reducing section coaxially connected from bottom to top, wherein the top end of the bottom reducing section is connected to the bottom end of the straight section, and the top end of the straight section is connected to the bottom end of the top reducing section.

4. The system according to claim 2, wherein the drying system further comprises a cyclone and a bag type dust collector, wherein one side of the top end of the cyclone is communicated with the end of the vertical cylinder, the other side of the top end of the cyclone is communicated with one side of the top end of the bag type dust collector, the material outlets are respectively arranged at the bottom end of the cyclone and the bottom end of the bag type dust collector, and the exhaust gas outlet is arranged at the other side of the top end of the bag type dust collector.

5. The system according to claim 4, wherein the top end of the cyclone dust collector is provided with an explosion-proof valve, the body of the bag dust collector is provided with an explosion-proof sheet, and the top end inlet and the exhaust gas outlet of the bag dust collector are respectively provided with a stop valve.

6. The system of claim 4, wherein the drying system further comprises a metering and conveying system for weighing the pre-dried material, a rotor scale for weighing the material flowing out of the material outlet, and a pneumatic conveying system for conveying the dried material to a main burner of the cement kiln head.

7. The system according to any one of claims 1-6, wherein the exhaust gas innocent treatment system further comprises a bypass exhaust gas pipeline connected with the cement burning system, the bypass exhaust gas pipeline is communicated with a first pipeline, the grate cooler system is provided with a hot air outlet, the hot air outlet is communicated with a second pipeline, the first pipeline and the second pipeline are connected at one end of a third pipeline in a converging manner, and the other end of the third pipeline is communicated with an air inlet for conveying hot air by the drying system.

8. The system of claim 7, wherein the third pipeline is externally connected with a first branch, the first branch is communicated with air, and a cold air valve is arranged on the first branch.

9. The system of claim 7, wherein the grate cooler system is in communication with a rotary kiln, wherein exhaust gas from the grate cooler is circulated within the rotary kiln, and wherein harmful substances in the exhaust gas are digested within the rotary kiln.

10. The system according to claim 7, wherein a plurality of cooling fans are arranged on the grate cooler, one ends of the cooling fans are communicated with the air outlet of the condensing tower, and the other ends of the cooling fans are led into the grate cooler.

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