CN210885835U

CN210885835U - Multistage preheating system for cement predecomposition kiln

Info

Publication number: CN210885835U
Application number: CN201921787973.9U
Authority: CN
Inventors: 吴松青; 雷超; 彭明珠
Original assignee: Huize Jinyuan Cement Co ltd
Current assignee: Huize Jinyuan Cement Co ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-06-30
Anticipated expiration: 2029-10-23

Abstract

The utility model discloses a cement predecomposition kiln is with multistage system of preheating, including the storage tank, decompose kiln and multistage pre-heater, multistage pre-heater includes the one-level pre-heater, the second grade pre-heater, tertiary pre-heater and level four pre-heater, the one-level pre-heater, the second grade pre-heater, tertiary pre-heater and level four pre-heater all include preheating tank and settling cask, the top of preheating tank is provided with the feed inlet, be provided with the air inlet on the lateral wall, be provided with the guide plate on the inner wall of preheating tank, the vertical honeycomb duct that is provided with in preheating tank, be provided with in the preheating tank of honeycomb duct below and scrape the material subassembly, the top of settling cask is provided with the gas outlet, the bottom is provided with the awl and fights, upper portion in the settling. The system not only reduces the investment cost of equipment and saves space, but also has stable and uniform conveying in the process of preheating raw materials and better preheating effect.

Description

Multistage preheating system for cement predecomposition kiln

Technical Field

The utility model belongs to the technical field of cement manufacture, concretely relates to multistage preheating system is used to cement predecomposition kiln.

Background

The cement clinker is produced by high-temperature calcination of cement raw materials after preheating and decomposition. The cement raw material is mainly formed by grinding and homogenizing a calcareous raw material, a clayey raw material and a correction raw material. The prior production process of cement clinker generally adopts an extrakiln predecomposition technology, which is also the most advanced cement production technology at present and is characterized in that: a suspension preheater system with out-of-kiln predecomposition mainly comprises a decomposing furnace, a multi-stage cyclone preheater, a connecting air pipe, a material pipe and the like. The pulverized coal is completely combusted in the decomposing furnace, the raw materials are fully decomposed in the decomposing furnace, and the high-temperature gas out of the decomposing furnace is subjected to heat exchange for many times in the preheater system, so that the purposes of reducing the waste gas temperature of the preheater system and improving the temperature of the materials entering the furnace are achieved, and the heat exchange efficiency of the kiln tail system of the pre-decomposing kiln is improved. The existing cement kiln external preheater system mainly adopts a plurality of cyclone cylinders connected in series, when raw materials are preheated, raw materials are driven by airflow to spirally flow in the cyclone cylinders to preheat the raw materials, and the preheater with the structure finds that firstly, at least more than 5 cyclone cylinders are required to be connected in series to preheat the raw materials, so that the investment cost of equipment is high, and the occupied space is large; secondly, in the process of preheating, along with the extension of the preheating pipeline, the raw materials are not easy to be taken away by airflow, the airflow is difficult to uniformly convey the raw materials into the decomposition kiln, and finally, the condition of conveying empty materials is likely to exist; thirdly, the contact area of the air flow and the powder is not uniform, the preheating temperature is not uniform, and the situation that the preheating effect is not ideal happens occasionally. Therefore, it is an objective need to develop a multistage preheating system for a cement predecomposition kiln, which has reasonable structural design, low cost, good preheating effect, energy conservation and capability of realizing uniform and stable conveying of preheated raw materials.

Disclosure of Invention

An object of the utility model is to provide a multistage preheating system for cement predecomposition kiln that structural design is reasonable, with low costs, preheat effectual, the energy saving, and can realize preheating that the raw material is even, stable transport.

The utility model aims at realizing the method, which comprises a storage tank, a decomposition kiln and a multi-stage preheater arranged between the storage tank and the decomposition kiln, wherein the multi-stage preheater comprises a first-stage preheater, a second-stage preheater, a third-stage preheater and a fourth-stage preheater, the first-stage preheater, the second-stage preheater, the third-stage preheater and the fourth-stage preheater have the same structure and respectively comprise a preheating tank and a settling tank, the settling tank is arranged at one side of the preheating tank, the bottom of the preheating tank is of a circular arc structure, the top of the preheating tank is provided with a feed inlet, the side wall is provided with an air inlet which enters the preheating tank in a tangential direction, the inner wall of the preheating tank is provided with a guide plate with a downward spiral, a guide pipe is vertically arranged in the preheating tank, the upper end of the guide pipe extends out of the top of the preheating, the top of the settling tank is provided with an air outlet, an induced draft fan is installed on the air outlet, a conical hopper is arranged at the bottom of the settling tank, a flower plate is arranged at the upper part of the settling tank, a partition plate is arranged at the lower part of the settling tank, a blanking channel is arranged between the partition plate and the inner wall of the settling tank, a mixed gas inlet is arranged on the side wall of the settling tank between the flower plate and the partition plate, and the mixed gas inlet is communicated with a;

the bottom export of storage tank and the feed inlet intercommunication of one-level pre-heater, the cone of one-level pre-heater is fought and is passed through the feed inlet intercommunication of one-level inlet pipe and second grade pre-heater, the cone of second grade pre-heater is fought and is passed through the feed inlet intercommunication of second grade inlet pipe and third grade pre-heater, the cone of third grade pre-heater is fought and is passed through fourth grade inlet pipe and decomposition kiln intercommunication, be provided with waste heat recovery pipe on the decomposition kiln, waste heat recovery pipe admits air and fourth grade pre-heater's air inlet intercommunication through the one-level, the gas outlet of fourth grade pre-heater passes through the air inlet intercommunication of second grade intake pipe and third grade pre-heater, the gas outlet of second grade pre-heater passes through the air inlet intercommunication of fourth grade intake pipe and first grade pre.

Furthermore, a guide cover with a small upper end and a large lower end is arranged at the bottom of the guide pipe.

Further, scrape the material subassembly and include motor, transmission shaft and scraper blade, the motor is installed in the outside of preheating tank, transmission shaft horizontal installation is in the bottom of preheating tank, and one of them one end of transmission shaft stretches out to preheat the tank and be connected with motor drive outward, the scraper blade equipartition is installed on the transmission shaft, and the surface radian of scraper blade cooperatees with the bottom cambered surface of preheating tank.

Furthermore, a bypass pipe is arranged between the air outlet of the first-stage preheater and the feed inlet of the first-stage preheater, and a bypass valve is installed on the bypass pipe.

Furthermore, all install on one-level inlet pipe, second grade inlet pipe, tertiary inlet pipe and the level four inlet pipe and shake glassware and feed valve.

Further, install the draught fan on the blast pipe, all install admission valve and manometer in one-level intake pipe, second grade intake pipe, tertiary intake pipe and the level four intake pipe.

Compared with the prior art, the utility model discloses a have a bit to be: firstly, the number of preheaters is reduced, the investment cost of equipment is fundamentally reduced, the space is saved, and the risk coefficient of high-altitude operation caused by overhauling and maintaining the equipment in the preheating process is reduced; the preheating tank can fully mix the raw material and the airflow entering the tank, and the raw material and the airflow are enabled to make spiral motion in the tank along the set direction, so that the contact area of the raw material and the airflow can be increased, the contact area of the raw material and the airflow in unit time can be increased, and the preheating effect can be greatly improved; and thirdly, the raw materials are preheated by using the waste heat of the flue gas generated by the decomposing kiln, so that the waste of heat energy is reduced, the cost is reduced, and the system has the advantages of reasonable structural design, low cost, good preheating effect, saving and environmental protection, and is easy to popularize and use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the structure of a primary preheater 2, a secondary preheater 3, a tertiary preheater 4 and a quaternary preheater 5;

in the figure, 1-decomposing kiln, 2-first-stage preheater, 3-second-stage preheater, 4-third-stage preheater, 5-fourth-stage preheater, 6-material storage tank, 7-first-stage feeding pipe, 8-second-stage feeding pipe, 9-third-stage feeding pipe, 10-fourth-stage feeding pipe, 11-first-stage air inlet pipe, 12-second-stage air inlet pipe, 13-third-stage air inlet pipe, 14-fourth-stage air inlet pipe, 15-air outlet pipe, 16-dust remover, 17-bypass pipe, 18-settling tank, 19-blanking channel, 20-partition plate, 21-pattern plate, 22-air outlet, 23-mixed gas inlet, 24-communicating pipe, 25-preheating tank, 26-feed inlet, 27-air inlet, 28-flow guide pipe and 29-flow guide groove, 30-guide plate, 31-guide cover, 32-motor, 33-transmission shaft and 34-scraper plate.

Detailed Description

The following further describes the present invention with reference to the attached drawings, but the present invention is not limited in any way, and any changes or improvements based on the teaching of the present invention all belong to the protection scope of the present invention.

As shown in fig. 1-2, the utility model comprises a storage tank 6, a decomposition kiln 1 and a multi-stage preheater arranged between the storage tank 6 and the decomposition kiln 1, wherein the multi-stage preheater comprises a first-stage preheater 2, a second-stage preheater 3, a third-stage preheater 4 and a fourth-stage preheater 5, the first-stage preheater 2, the second-stage preheater 3, the third-stage preheater 4 and the fourth-stage preheater 5 have the same structure, and each of the first-stage preheater 2, the second-stage preheater 3, the third-stage preheater 4 and the fourth-stage preheater 5 comprises a preheating tank 25 and a settling tank 18, the settling tank 18 is arranged at one side of the preheating tank 25, the bottom of the preheating tank 25 is in a circular arc structure, a feed inlet 26 is arranged at the top of the preheating tank 25, an air inlet 27 which enters the preheating tank 25 in a tangential direction is arranged on the side wall, a guide plate 30 which, be provided with the ascending guiding gutter 29 of spiral on the inner wall of honeycomb duct 28, be provided with the scraper subassembly in the preheating tank 25 of honeycomb duct 28 below, the top of settling cask 18 is provided with gas outlet 22, installs the draught fan on the gas outlet 22, and the bottom is provided with the awl and fights, upper portion in the settling cask 18 is provided with card 21, and the lower part is provided with baffle 20, be provided with unloading passageway 19 between baffle 20 and the settling cask 18 inner wall, be provided with gas mixture import 23 on settling cask 18 lateral wall between card 21 and baffle 20, gas mixture import 23 is through communicating pipe 24 and honeycomb duct 28 intercommunication.

The working process and principle of the first-stage preheater 2, the second-stage preheater 3, the third-stage preheater 4 and the fourth-stage preheater 5 are the same, because the spiral guide plate 30 is arranged in the preheating tank 25, after raw materials enter the preheating tank 25 from the feed inlet 26, airflow enters from the air inlet 27 along the tangential direction of the preheating tank 25 and drives the raw materials to do spiral downward movement along the guide plate 30, so that the raw materials are heated by the airflow in the spiral movement process, because the guide pipe 28 is internally provided with the spiral upward guide groove 29, when the airflow and the raw materials move to the bottom of the preheating tank 25, the preheated raw materials spirally move upward in the guide pipe 28 under the action of the induced draft fan, and are further preheated, if the raw materials are deposited at the bottom of the preheating tank 25, the raw materials can be scraped to the lower part of the guide pipe 28 through the scraping component, after preheating, the raw materials are discharged from the guide pipe 28 and enter the settling tank, after being blocked by the flower plate 21 in the settling tank 18 and buffered by the partition plate 20, the separation of air flow and raw materials can be realized, the raw materials enter the preheater of the next stage from the feeding channel 19 through the cone hopper, and the air flow enters the preheater of the previous stage through the air outlet 22.

The bottom outlet of the storage tank 6 is communicated with the feed inlet 26 of the first-stage preheater 2, the cone hopper of the first-stage preheater 2 is communicated with the feed inlet 26 of the second-stage preheater 3 through a first-stage feed pipe 7, the cone hopper of the second-stage preheater 3 is communicated with the feed inlet 26 of the third-stage preheater 4 through a second-stage feed pipe 8, the cone hopper of the third-stage preheater 4 is communicated with the feed inlet 26 of the fourth-stage preheater 5 through a third-stage feed pipe 9, the cone hopper of the fourth-stage preheater 5 is communicated with the decomposition kiln 1 through a fourth-stage feed pipe 10, the decomposition kiln 1 is provided with a waste heat recovery pipe, the waste heat recovery pipe is communicated with the air inlet 27 of the fourth-stage preheater 5 through a first-stage air inlet 11, the air outlet 22 of the fourth-stage preheater 5 is communicated with the air inlet 27 of the third-, the air outlet 22 of the secondary preheater 3 is communicated with the air inlet 27 of the primary preheater 2 through a four-stage air inlet pipe 14, and the air outlet 22 of the primary preheater 2 is connected with a dust remover 16 through an exhaust pipe 15.

The working process of the system is as follows: raw material in the storage tank 6 gets into one-level preheater 2 in proper order under the effect of air current, second grade preheater 3, tertiary preheater 4 and level four preheater 5 accomplish preheating process, later get into decomposition kiln 1, more specifically, at the in-process of 1 sintering in decomposition kiln, can produce a large amount of heats, these heats are under the effect of draught fan, pass through level four preheater 5 in proper order, tertiary preheater 4, secondary preheater 3 and level one preheater 2, carry out the heat transfer with the raw material in each preheater, thereby the realization is to the purpose that the raw material preheats.

Further, in order to accelerate the absorption speed of the material at the bottom of the preheating tank 25 by the draft tube 28, a draft hood 31 with a small upper end and a large lower end is installed at the bottom of the draft tube 28.

Further, scrape the material subassembly and include motor 32, transmission shaft 33 and scraper blade 34, the finished product motor that motor 32 sells on the direct purchase market of power according to using, motor 32 installs the outside at preheating tank 25, transmission shaft 33 horizontal installation is in the bottom in preheating tank 25, and one of them one end of transmission shaft 33 stretches out outside preheating tank 25 and is connected with motor 32 transmission, scraper blade 34 equipartition is installed on transmission shaft 33, and the surface radian of scraper blade 34 cooperatees with the bottom cambered surface of preheating tank 25, and during the scraping, motor 32 drives transmission shaft 33 and rotates, and rotation shaft 33 drives scraper blade 34 and rotates, and scraper blade 34 can scrape the raw material of preheating tank 25 bottom to the below of honeycomb duct 28 at the pivoted in-process.

In order to avoid the situation that the feed inlet 26 is blocked by the raw meal in the blanking process, a bypass pipe 17 is arranged between the air outlet 22 of the primary preheater 2 and the feed inlet 26 of the primary preheater 2, a bypass valve is arranged on the bypass pipe 17, and the bypass pipe 17 conveys airflow into the feed inlet 26, so that the blanking speed of the raw meal can be accelerated.

In order to avoid the situation that preheated raw meal is blocked in each feeding pipe, a material vibrating device and a feeding valve are arranged on the first-stage feeding pipe 7, the second-stage feeding pipe 8, the third-stage feeding pipe 9 and the fourth-stage feeding pipe 10, and the feeding valve adopts a powder pump used in the prior art.

Further, install the draught fan on the blast pipe 15, all install admission valve and manometer on one-level intake pipe 11, second grade intake pipe 12, tertiary intake pipe 13 and the level four intake pipe 14, can control the gas flow in each intake pipe through the admission valve, the admission valve is the solenoid valve, can real-time atmospheric pressure condition in each intake pipe of detection through the manometer to guarantee equipment safety, stable operation.

Claims

1. The utility model provides a cement predecomposition kiln is with multistage preheating system, includes storage tank (6), decomposition kiln (1) and sets up the multistage preheater between storage tank (6) and decomposition kiln (1), its characterized in that:

the multi-stage preheater comprises a first-stage preheater (2), a second-stage preheater (3), a third-stage preheater (4) and a fourth-stage preheater (5), the first-stage preheater (2), the second-stage preheater (3), the third-stage preheater (4) and the fourth-stage preheater (5) are identical in structure and respectively comprise a preheating tank (25) and a settling tank (18), the settling tank (18) is arranged on one side of the preheating tank (25), the bottom of the preheating tank (25) is of an arc structure, a feed inlet (26) is formed in the top of the preheating tank (25), an air inlet (27) which enters the preheating tank (25) in a tangential direction is formed in the side wall of the preheating tank, a guide plate (30) which is downward spirally is arranged on the inner wall of the preheating tank (25), a guide pipe (28) is vertically arranged in the preheating tank (25), and the upper end of the guide pipe (28, the inner wall of the draft tube (28) is provided with a spiral upward guide groove (29), a material scraping assembly is arranged in a preheating tank (25) below the draft tube (28), the top of the settling tank (18) is provided with an air outlet (22), an induced draft fan is installed on the air outlet (22), the bottom of the settling tank is provided with a cone hopper, the upper part of the interior of the settling tank (18) is provided with a pattern plate (21), the lower part of the interior of the settling tank (18) is provided with a partition plate (20), a discharging channel (19) is arranged between the partition plate (20) and the inner wall of the settling tank (18), the side wall of the settling tank (18) between the pattern plate (21) and the partition plate (20) is provided with a mixed gas inlet (23), and the mixed gas;

the bottom export of storage tank (6) and feed inlet (26) intercommunication of one-level pre-heater (2), the awl of one-level pre-heater (2) is fought and is passed through one-level inlet pipe (7) and feed inlet (26) intercommunication of second grade pre-heater (3), the awl of second grade pre-heater (3) is fought and is passed through feed inlet (26) intercommunication of second grade inlet pipe (8) and third grade pre-heater (4), the awl of third grade pre-heater (4) is fought and is passed through feed inlet (26) intercommunication of tertiary inlet pipe (9) and fourth grade pre-heater (5), the awl of fourth grade pre-heater (5) is fought and is passed through fourth grade inlet pipe (10) and decomposition kiln (1) intercommunication, be provided with the waste heat recovery pipe on decomposition kiln (1), the waste heat recovery pipe passes through air inlet (27) intercommunication of one-level intake pipe (11) and fourth grade pre-heater (5), the gas outlet (22) of fourth grade pre-heater (5) is Leading to, air inlet (27) intercommunication of air outlet (22) through tertiary intake pipe (13) and secondary preheater (3) of tertiary preheater (4), air inlet (27) intercommunication of air outlet (22) through level four intake pipe (14) and primary preheater (2) of secondary preheater (3), air outlet (22) of primary preheater (2) are connected with dust remover (16) through blast pipe (15).

2. The multistage preheating system for the cement predecomposition kiln as claimed in claim 1, wherein: and a guide cover (31) with a small upper end and a large lower end is arranged at the bottom of the guide pipe (28).

3. The multistage preheating system for the cement predecomposition kiln as claimed in claim 1, wherein: the scraping component comprises a motor (32), a transmission shaft (33) and scraping plates (34), the motor (32) is installed outside the preheating tank (25), the transmission shaft (33) is horizontally installed at the bottom of the preheating tank (25), one end of the transmission shaft (33) extends out of the preheating tank (25) and is in transmission connection with the motor (32), the scraping plates (34) are uniformly installed on the transmission shaft (33), and the surface radian of each scraping plate (34) is matched with the bottom arc surface of the preheating tank (25).

4. The multistage preheating system for the cement predecomposition kiln as claimed in claim 1, wherein: a bypass pipe (17) is arranged between the air outlet (22) of the first-stage preheater (2) and the feed inlet (26) of the first-stage preheater (2), and a bypass valve is installed on the bypass pipe (17).

5. The multistage preheating system for the cement predecomposition kiln as claimed in claim 1, wherein: all install on one-level inlet pipe (7), second grade inlet pipe (8), tertiary inlet pipe (9) and level four inlet pipe (10) and shake glassware and feed valve.

6. The multistage preheating system for the cement predecomposition kiln as claimed in claim 1, wherein: the induced draft fan is installed on the exhaust pipe (15), and an air inlet valve and a pressure gauge are installed on the one-level air inlet pipe (11), the two-level air inlet pipe (12), the three-level air inlet pipe (13) and the four-level air inlet pipe (14).