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CN-122015512-A - Mineral powder mill waste gas waste heat utilization system coupled to cement kiln head

CN122015512ACN 122015512 ACN122015512 ACN 122015512ACN-122015512-A

Abstract

The invention relates to the technical field of cement industry energy conservation and waste heat recovery, in particular to a waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head, which comprises a mounting platform. The built-in integrated self-cleaning mechanism of the heat exchanger of the waste gas waste heat utilization system of the mineral powder mill, which is coupled to the cement kiln head, drives the cleaning mechanism to move along the axial direction of the heat exchange tube through the telescopic cylinder, drives the half bevel gear and the arc bevel rack to be meshed alternately through the motor, drives the annular limiting sleeve to rotate reciprocally, and synchronously realizes the full-range cleaning of the central heat exchange tube and the peripheral edge heat exchange tube, wherein the T-shaped scraping plate rotates reciprocally along with the annular limiting sleeve to continuously crush and scrape the scale deposit layer on the outer wall of the central heat exchange tube, and the cleaning scraping ring is matched to clean the edge heat exchange tube synchronously, so that dead angle free cleaning of the surfaces of all heat exchange tubes is realized, and the problem of heat exchange efficiency attenuation caused by the accumulation of the scale deposit layer is fundamentally avoided.

Inventors

  • ZHANG FENGFENG
  • CHANG XIANGMING
  • ZHAO WUKUI
  • WANG JIANWEI
  • ZHAO GUOWEI

Assignees

  • 山西昌灏环保科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260323

Claims (9)

  1. 1. The utility model provides a mineral powder mill waste gas waste heat utilization system coupled in cement kiln head, includes mounting platform (1), install on mounting platform (1) and be used for carrying out refrigerated comb cold machine (2) to cement kiln high temperature clinker, the waste gas outlet intercommunication of comb cold machine (2) has AQC boiler (3), the gas outlet intercommunication of AQC boiler (3) has heat exchanger (4), the gas outlet intercommunication of heat exchanger (4) has sack cleaner (6), AQC boiler (3), heat exchanger (4), sack cleaner (6) all install in on mounting platform (1); The heat exchanger is characterized in that the heat exchanger (4) comprises a shell (41), a central heat exchange tube (42) is arranged in the shell (41), at least six edge heat exchange tubes (43) are circumferentially arranged in the central heat exchange tube (42), the upper end and the lower end of each of the central heat exchange tube (42) and each of the edge heat exchange tubes (43) are fixed on the inner wall of the shell (41) through connecting sleeves (44), and two isolation plates (45) which are vertically distributed are sleeved in the middle parts of the central heat exchange tube (42) and each of the edge heat exchange tubes (43); The connecting sleeve (44) on the upper side is fixedly connected with a telescopic cylinder (46), a piston rod of the telescopic cylinder (46) downwards penetrates through the isolation plate (45) on the upper side and is fixedly connected with a central sleeve ring (47), the central sleeve ring (47) is slidably sleeved on the outer side of the central heat exchange tube (42), the outer wall of the central sleeve ring (47) is rotatably sleeved with an annular limiting sleeve (48), the inner wall of the annular limiting sleeve (48) is fixedly provided with a T-shaped scraping plate (413), and the inner side of the T-shaped scraping plate (413) is attached to the outer wall of the central heat exchange tube (42), and the central sleeve ring (47) is provided with a reciprocating rotary driving assembly for driving the annular limiting sleeve (48) to rotate in a reciprocating manner; The outer wall of the center lantern ring (47) is fixedly connected with cleaning protection barrels (5) matched with the edge heat exchange tubes (43) in number through connecting plates, cleaning scraping rings (52) are rotatably connected to the inner wall of the cleaning protection barrels (5), the inner sides of the cleaning scraping rings (52) are attached to the outer wall of each edge heat exchange tube (43), a hinged push rod (53) is hinged between the annular limiting sleeve (48) and each cleaning scraping ring (52), and the annular limiting sleeve (48) drives the cleaning scraping rings (52) to synchronously and reciprocally rotate through the hinged push rods (53) when reciprocally rotating.
  2. 2. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 1, wherein the reciprocating rotary driving assembly comprises arc grooves (49) formed in the outer wall of an annular limiting sleeve (48), arc conical racks (410) are fixed on the inner walls of the upper side and the lower side of the arc grooves (49), a half conical gear (411) is arranged between the two arc conical racks (410), a motor (412) is fixedly connected to a rotating shaft of the half conical gear (411), the motor (412) is fixedly arranged on the outer wall of a central sleeve ring (47), and the half conical gear (411) is alternately meshed with the upper arc conical rack and the lower arc conical rack (410) in the rotating process to drive the annular limiting sleeve (48) to reciprocate along the central sleeve ring (47).
  3. 3. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 2, wherein through grooves (414) corresponding to the T-shaped scrapers (413) one by one are formed in the central collar (47), the transverse rod ends of the T-shaped scrapers (413) penetrate through the through grooves (414) and are fixed on the inner wall of the annular limiting sleeve (48), and the vertical plate ends of the T-shaped scrapers (413) are attached to the outer wall of the central heat exchange tube (42).
  4. 4. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 1, wherein at least six edge heat exchange tubes (43) are uniformly distributed in a regular polygon shape with a center heat exchange tube (42) as a center, the aperture of a lower isolation plate (45) is larger than that of an upper isolation plate (45), and a cleaning door is arranged at the bottom of the side face of the shell (41).
  5. 5. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 1, wherein an arc pushing groove (51) is formed in the top of the cleaning protective cylinder (5), one end of the hinged push rod (53) is hinged to the outer wall of the annular limiting sleeve (48), the other end of the hinged push rod (53) is hinged to the top of the cleaning scraping ring (52), and the sliding limit of the hinged ends of the hinged push rod (53) and the cleaning scraping ring (52) is located in the arc pushing groove (51).
  6. 6. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 1, wherein a fixing ring (54) is fixedly sleeved on the outer wall of the cleaning scraping ring (52), a containing groove (541) is formed in the fixing ring (54), an L-shaped booster rod (542) is movably inserted into the bottom of the fixing ring (54), the upper end of the L-shaped booster rod (542) stretches into the containing groove (541), spring telescopic rods (543) are hinged to two sides of the upper end of the L-shaped booster rod (542), opposite ends of the two spring telescopic rods (543) are hinged to the inner wall of the containing groove (541), and the two spring telescopic rods (543) are distributed in an inverted-eight shape; The inner wall activity of retainer plate (54) is interluded has T shape breaker plate (544), the horizontal rod end of T shape breaker plate (544) stretches into in holding tank (541) and articulates there is deflection push pedal (545), the one end that keeps away from T shape breaker plate (544) of deflection push pedal (545) articulates in the upper end of L shape booster push rod (542).
  7. 7. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 6, wherein an accommodating ring pipe (56) is fixed on the inner wall of the cleaning protection barrel (5), the accommodating ring pipe (56) is positioned below the fixed ring (54), a damping spring telescopic rod (561) is fixed on the inner wall of the accommodating ring pipe (56), a push plate (562) is fixed on the end part of the damping spring telescopic rod (561), a plurality of inclined plates (563) which are distributed in a staggered manner are fixed on the end face of the push plate (562) facing the axis of the accommodating ring pipe (56), one end of each inclined plate (563) is an inclined plane, a deflection groove (564) is formed in the bottom of the other end, and a limiting plate (565) is hinged in the deflection groove (564); The push plate (562) is still fixed with bottom spring flexible hook plate (569) towards the terminal surface that holds ring canal (56) axle center, bottom spring flexible hook plate (569) are located the downside of swash plate (563), the one end of bottom spring flexible hook plate (569) is the chamfer, the lower extreme cover of L shape booster push rod (542) is equipped with the roller bearing, the bottom butt of roller bearing and bottom spring flexible hook plate (569).
  8. 8. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 7, wherein a plurality of U-shaped inserting rods (566) are movably inserted in the accommodating annular pipe (56), two ends of each U-shaped inserting rod (566) extend into the accommodating annular pipe (56) and are fixedly connected with two sides of the pushing plate (562), a cross rod of each U-shaped inserting rod (566) is of a cambered surface structure, an L-shaped pushing rod (567) is abutted to the cross rod of each U-shaped inserting rod (566), a connecting rod (568) is hinged to the middle of each L-shaped pushing rod (567), one end, far away from each L-shaped pushing rod (567), of each connecting rod (568) is fixed to the bottom surface of the corresponding fixing annular ring (54), and the lower end of each L-shaped pushing rod (567) is attached to the outer wall of the edge heat exchange tube (43).
  9. 9. The waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head according to claim 7, wherein the number of the inclined plates (563) fixed on the push plate (562) is four, the four inclined plates (563) are arranged in a staggered manner along the vertical direction, and the maximum height of the L-shaped booster push rod (542) pulled by the spring telescopic rod (543) is matched with the bottom height of the uppermost inclined plate (563).

Description

Mineral powder mill waste gas waste heat utilization system coupled to cement kiln head Technical Field The invention relates to the technical field of cement industry energy conservation and waste heat recovery, in particular to a mineral powder mill waste gas waste heat utilization system coupled to a cement kiln head, which can be widely applied to waste heat cascade recovery, efficient utilization and waste gas purification pretreatment scenes of kiln head clinker cooling waste gas in a novel dry cement production line. Background At present, waste heat recovery of waste gas of a cement kiln head grate cooler in industry mainly adopts an AQC waste heat boiler to carry out heat energy recovery, and produced steam is used for power generation or production heat supply, so that primary utilization of waste heat is realized. However, waste gas subjected to heat exchange by the AQC boiler still contains a large amount of medium-low temperature waste heat, if the waste gas is directly discharged into a subsequent cloth bag dust removing system, serious waste of waste heat resources is caused, meanwhile, the medium-high temperature waste gas can accelerate ageing and damage of a filter bag of the cloth bag dust remover, the service life of the filter bag is greatly shortened, and the operation and maintenance cost of the system is increased. In order to solve the problems, a shell-and-tube heat exchanger is generally additionally arranged between an AQC boiler and a bag-type dust collector in the industry, so that waste heat of waste gas is recycled in a secondary step mode, and meanwhile the temperature of the waste gas entering the dust collector is reduced. In actual production operation, however, cement kiln head waste gas contains a large amount of components such as high-hardness clinker dust, alkaline oxide and the like, an adhesive accumulated ash and a hard scaling layer are easily formed on the outer wall of a heat exchange tube in the heat exchange process, and as the operation time is increased, the scaling layer is continuously thickened, so that the heat exchange coefficient of the heat exchange tube is rapidly reduced, the waste heat recovery effect of the heat exchanger is seriously weakened, even a heat exchange channel is blocked, and the normal operation of a system is influenced. Aiming at the problem of scale cleaning of a heat exchange tube, the prior art mainly adopts the modes of off-line manual cleaning, on-line steam soot blowing, sonic soot cleaning and the like, wherein the off-line manual cleaning needs system shutdown, the continuous production efficiency of a cement production line is seriously affected, the cleaning operation environment is bad and the labor intensity is high, the on-line steam soot blowing and sonic soot cleaning can only remove loose floating ash on the surface of the heat exchange tube, the cleaning effect on a firmly-adhered hard scale layer is extremely poor, the problem of heat exchange efficiency attenuation caused by scale cannot be fundamentally solved, few heat exchangers adopting a mechanical scraping structure have the defects of limited cleaning coverage range and asynchronous cleaning of a central heat exchange tube and an edge heat exchange tube, the targeted crushing cleaning cannot be carried out on a thick scale area, meanwhile, the scraping element is in contact with the heat exchange tube for a long time, the excessive abrasion is easily caused, the service life is short, the structural stability is poor, and the poor is difficult to adapt to the bad continuous operation working condition of high temperature and high dust of a cement kiln head. Therefore, research and development of a waste heat utilization system capable of realizing the gradient-type efficient utilization of waste heat of cement kiln head waste gas, simultaneously having the online self-cleaning and thick scaling targeted crushing functions of a heat exchange tube and capable of stably running for a long time becomes a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a waste heat utilization system of mineral powder mill waste gas coupled to a cement kiln head, so as to solve the problems in the background art. The waste gas waste heat utilization system of the mineral powder mill coupled to the cement kiln head comprises a mounting platform, wherein a grate cooler for cooling high-temperature clinker of the cement kiln is mounted on the mounting platform, an waste gas outlet of the grate cooler is communicated with an AQC boiler, an air outlet of the AQC boiler is communicated with a heat exchanger, an air outlet of the heat exchanger is communicated with a bag-type dust remover, and the AQC boiler, the heat exchanger and the bag-type dust remover are mounted on the mounting platform; the heat exchanger comprises a shell, wherein a central heat exchange tube is arranged in the shell, at least six edge heat exchange tubes ar