CN212511115U - Slag cooling and conveying system of circulating fluidized bed boiler - Google Patents

Abstract

The utility model provides a slag cooling and conveying system of a circulating fluidized bed boiler. Suitable for cooling, transporting and processing of slag, including: a circulating fluidized bed boiler in which high temperature slag is generated; the steel strip slag cooler is used for cooling and conveying the high-temperature slag; the circulating air duct is communicated with the tail part of the steel strip slag cooler and is used for controlling the heat exchange between the ambient air and the high-temperature slag and recycling the heat of the high-temperature slag; and the boiler tail flue is also communicated with the tail part of the steel strip slag cooler and is used for guiding the heat of the high-temperature slag into the atmosphere. The beneficial effects of the utility model reside in that: the utility model discloses operation safety and stability, wearing and tearing are extremely low, and the reliability is high to can loopback into the boiler with most slag heat, realize full automatization, environmental protection ization, resourceful cooling, carry the purpose of fluidized bed boiler slag.

Description

Slag cooling and conveying system of circulating fluidized bed boiler

Technical Field

The utility model relates to a fluidized bed boiler technical field, in particular to circulating fluidized bed boiler slag cooling conveying system.

Background

At present, with the rapid development of science and technology and the continuous innovation of technology, the capacity of a circulating fluidized bed boiler unit is larger and larger, and correspondingly, the yield of boiler furnace slag is also larger and larger. For a long time, the slag cooling and conveying mode commonly adopted by circulating fluidized bed boilers all over the world is an air-water combined drum type slag cooler, slag generated by the circulating fluidized bed boilers usually contains high silicon dioxide or other abrasive materials, the temperature of the slag is 800-:

1. the equipment is worn quickly and seriously: because the high-temperature slag (800-1100 ℃) and the heat exchange fins and the cooling water pipes in the roller slag cooler have relative motion, the internal parts of the roller slag cooler are quickly and seriously abraded, the advance of the slag in the roller is influenced, the slag discharge capacity of the slag cooler is greatly reduced, and the operation reliability of the slag cooler system is seriously reduced.

2. The slag cooler has high failure rate: because the parts of the roller slag cooler are quickly and seriously abraded, the slag cooler is frequently required to be stopped to overhaul or replace abraded parts, and even the slag cooler is suddenly stopped, thereby influencing the integral stable operation of the fluidized bed boiler.

3. There are potentially significant safety risks to equipment and operators: because the cold sediment ware of drum-type is united to geomantic omen designs for mainly cooling the slag through the indirect contact with water, because the quick mill of the inside radiating fin of the cold sediment ware of drum and condenser tube leaks, can cause the direct contact of cooling water and slag to produce vapor explosion danger, cause great potential safety hazard to equipment operation and operation personnel.

4. The heat recovery rate is low: the slag temperature of the circulating fluidized bed boiler is usually 800-1100 ℃, which contains a large amount of heat, and the existing roller slag cooler is difficult to recover the heat of the slag due to the adoption of water and air for cooling, thereby causing huge heat loss.

5. The water consumption is large: because the wind-water combined drum-type slag cooler mainly adopts water as a cooling medium, and a large amount of water is evaporated in the heat exchange process of hot slag and cooling water, the water consumption is high, and cooling water must be supplemented periodically.

SUMMERY OF THE UTILITY MODEL

The utility model provides a circulating fluidized bed boiler slag cooling conveying system for solve among the prior art circulating fluidized bed boiler equipment wearing and tearing fast, the wearing and tearing serious, the cold sediment ware fault rate is high, the rate of heat recovery is low and the big condition of water consumption.

A circulating fluidized bed boiler slag cooling transport system adapted for cooling, transporting and processing of slag, comprising:

a circulating fluidized bed boiler in which high temperature slag is generated;

the steel belt slag cooler is communicated with the circulating fluidized bed boiler through a slag dropping pipe; the steel strip slag cooler is used for cooling and conveying the high-temperature slag;

the circulating air duct is communicated with the tail part of the steel strip slag cooler, and an outlet of the circulating air duct is communicated with the circulating fluidized bed boiler; the circulating air duct is used for controlling heat exchange between ambient air and the high-temperature slag and recycling heat of the high-temperature slag;

and the boiler tail flue is communicated with the tail part of the steel strip slag cooler and is used for discharging cooling air subjected to heat exchange of high-temperature slag to the atmosphere through a dust remover.

As an embodiment of the present invention: the circulating air duct comprises a first dust removal device, a second dust removal device, a first fan, a second fan and a boiler secondary air pipeline; wherein the content of the first and second substances,

the inlet end of the first dust removal device is connected with a first dust removal inlet valve;

the inlet end of the second dust removal device is connected with a third dust removal inlet valve;

the inlet ends of the first dust removal device and the second dust removal device are also connected with a second dust removal inlet valve;

the outlet end of the first dust removal device is connected with a first fan inlet valve, and the first fan inlet valve is connected with the inlet end of the first fan;

the outlet end of the second dust removal device is connected with a second fan inlet valve, and the second fan inlet valve is connected with the inlet end of the second fan;

the first fan air outlet is connected with a first fan outlet valve;

the air outlet of the second fan is connected with a second fan outlet valve;

the first fan outlet valve and the second fan outlet valve are both connected with a boiler secondary air pipeline, and an air outlet of the boiler secondary air pipeline is connected with the circulating fluidized bed boiler.

As an embodiment of the present invention: the steel belt slag cooler comprises a first steel belt slag cooler, a second steel belt slag cooler and a main steel belt slag cooler;

the first steel strip separating slag cooler is connected with the boiler tail flue through a first tail flue cooling air pipeline; wherein the content of the first and second substances,

a first cooling air pipeline valve is arranged on the first tail flue cooling air pipeline;

the second steel strip separating slag cooler is connected with the tail flue of the boiler through a second tail flue cooling air pipeline; wherein the content of the first and second substances,

a second cooling air pipeline valve is arranged on the second tail flue cooling air pipeline;

the main steel belt slag cooler is connected with the boiler tail flue through a third tail flue cooling air pipeline; wherein the content of the first and second substances,

and a third cooling air pipeline valve is arranged on the third tail flue cooling air pipeline.

As an embodiment of the present invention: the slag falling pipe at least comprises a first slag falling pipe and a second slag falling pipe; wherein the content of the first and second substances,

the bottom parts of the first slag falling pipe and the second slag falling pipe are provided with distributing devices, the upper parts of the distributing devices are provided with expansion compensators, and the upper parts of the expansion compensators are provided with lower pressure transmitters; an isolation valve is arranged on the upper portion of the lower pressure transmitter, a thermocouple is arranged above the isolation valve, and an upper pressure transmitter is arranged above the thermocouple.

As an embodiment of the present invention: the interior of the slag falling pipe is lined with refractory materials or ceramic anti-abrasion materials, and the exterior of the slag falling pipe is provided with heat insulation materials, radiating fins and a safety protection net.

As an embodiment of the present invention: the first steel strip slag cooler, the second steel strip slag cooler and the main steel strip slag cooler are all composed of metal conveying belts and rollers; wherein the content of the first and second substances,

an upper cover plate is arranged at the upper part of the shell;

the metal conveying belt and the roller are arranged in the shell, and the metal conveying belt is arranged outside the roller; wherein the content of the first and second substances,

the number of the rollers is at least two;

the metal conveying belts of the first steel belt slag cooler and the second steel belt slag cooler are also provided with slag thickness regulating valves;

the slag thickness regulating valve comprises a regulating valve body, a regulating valve driving unit, a regulating valve plate and a regulating valve tensioning spring; wherein the content of the first and second substances,

the regulating valve driving unit is arranged at the top of the regulating valve body, the regulating valve plate and the regulating valve tensioning spring are arranged inside the regulating valve body, and two ends of the regulating valve tensioning spring are connected with the upper end and the lower end of the regulating valve plate;

the lower part of the metal conveying belt in the working running direction is supported by a plurality of bearing circular carrier rollers along the whole width of the conveying belt;

two sides of the lower part of the metal conveying belt in the return direction are supported by a rotary round supporting roller;

guide rollers are arranged on two sides of the metal conveying belt in the working direction and the return direction;

and a spraying device at the lower part of the conveying belt is arranged at the lower part of the metal conveying belt.

As an embodiment of the present invention: metal radiating fins are arranged on the upper cover plates and two sides of the first steel strip slag cooler, the second steel strip slag cooler and the main steel strip slag cooler, and cooling water pipes are arranged in the upper cover plates;

the middle part of the upper cover plate is provided with an upper cover plate spraying device; the cover plate spraying system is positioned right above the metal conveying belt, and the upper cover plate spraying device is supplied with water by a cooling water pipe.

As an embodiment of the present invention:

sealing brushes are further arranged inside the first steel strip slag cooler, the second steel strip slag cooler and the main steel strip slag cooler; gaps are formed between the bottom and the side faces of the sealing brush and the metal conveying belt; the sealing brush is made of high-temperature-resistant metal or nonmetal;

a dust guard is arranged between the working operation layer and the return stroke of the metal conveying belt;

and a side air inlet is also formed in the side surface of the steel strip slag cooler.

As an embodiment of the present invention: the tail parts of the first steel strip sub-cooler, the second steel strip sub-cooler and the main steel strip main cooler are provided with a first tensioning device and a second tensioning device; wherein the content of the first and second substances,

the first tensioning device is a pneumatic tensioning device or a hydraulic tensioning device;

the second tensioning device is a mechanical tensioning device.

As an embodiment of the present invention: the system realizes the cooling, conveying and processing of the high-temperature slag by the following steps:

step 1: high-temperature slag in the circulating fluidized bed boiler enters the slag falling pipe under the action of self gravity;

step 2: the expansion compensator of the slag dropping pipe is used for carrying out contraction or expansion compensation on the slag dropping pipe according to the cold condition and the heat condition of the circulating fluidized bed boiler;

and step 3: after the slag falling pipe is subjected to shrinkage or expansion compensation, the high-temperature slag falls into a metal conveying belt of the steel strip separating slag cooler through the distributing device;

and 4, step 4: when the high-temperature slag falls onto the metal conveying belt of the steel belt slag cooler, the slag thickness regulating valve calculates the material layer thickness at the maximum slag discharge amount according to the maximum slag discharge amount designed by the circulating fluidized bed boiler and the effective width of the metal conveying belt in combination with the normal running speed of the metal conveying belt, and the slag material layer thickness is set by regulating the distance between the regulating valve plate and the lower metal conveying belt;

and 5: controlling the upper cover plate spraying device and the lower conveying belt spraying device to atomize, spray and cool the metal conveying belt according to the thickness of the slag layer;

step 6: when the heat generated after cooling the high-temperature slag and the metal conveyor belt 35 in the step 5 needs to be recycled through the circulating air duct 4, performing a step 7; when the heat generated after cooling the high-temperature slag and the metal conveyer belt 35 in the step 5 is not required to be recovered, and is required to be introduced into the atmosphere through the boiler tail flue 5, executing a step 8;

and 7: the first draught fan or the second draught fan introduces ambient air through the side air inlet, the ambient air with heat in the steel belt slag cooler is dedusted by the first dedusting device or the second dedusting device, and then the ambient air is introduced into the secondary air pipeline of the boiler through the first draught fan or the second draught fan and enters the circulating fluidized bed boiler until the high-temperature slag is cooled to a proper safe temperature;

and 8: first draught fan or second draught fan pass through ambient air is introduced to the side air intake, and ambient air takes the heat in the cold sediment ware of branch steel band is arranged to boiler afterbody flue along afterbody flue cooling air duct, discharges to atmosphere through boiler dust remover, chimney.

The beneficial effects of the utility model reside in that: the utility model discloses when handling fluidized bed high temperature slag, the in-process that the slag was carried on metal conveyer belt, because there is not relative motion between slag and the metal conveyer belt, metal conveyer belt's wearing and tearing can almost be ignored, metal conveyer belt's life is on average more than 10 years, is about more than 5 times in the cold sediment ware life-span of cylinder, consequently adopts the utility model discloses the technique has thoroughly solved the problem that traditional technique equipment wearing and tearing are fast, wearing and tearing are serious.

The utility model discloses technical boiler slag mainly is cooled off through the inspiratory cooling air from the environment, even at cold sediment ware upper cover plate internally mounted condenser tube, these condenser tube can not direct contact with boiler slag, it is mainly the inside air of cold sediment ware of cooling to cooling air through lower temperature increases the cooling efficiency of fluidized bed high temperature slag, consequently does not have the danger of vapor explosion, can not cause any potential safety hazard to equipment operation and operation personnel.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the system components of a slag cooling conveying system of a circulating fluidized bed boiler according to an embodiment of the present invention;

FIG. 2 is a schematic layout of a slag cooling conveying system for a circulating fluidized bed boiler according to an embodiment of the present invention;

FIG. 3 is a schematic view of a slag falling pipe of the slag cooling conveying system of the circulating fluidized bed boiler according to an embodiment of the present invention;

FIG. 4 is a front view of a slag thickness regulating valve of a slag cooling conveying system of a circulating fluidized bed boiler according to an embodiment of the present invention;

FIG. 5 is a sectional view of a slag thickness regulating valve of a slag cooling conveying system of a circulating fluidized bed boiler in an embodiment of the present invention;

FIG. 6 is a sectional view of a main steel strip slag cooler and a steel strip slag cooler of a slag cooling conveying system of a circulating fluidized bed boiler according to an embodiment of the present invention;

fig. 7 is a schematic view of a tensioner of a slag cooling conveying system of a circulating fluidized bed boiler according to an embodiment of the present invention.

Reference numerals

1 is a circulating fluidized bed boiler, 2 is a slag dropping pipe, 21 is a first slag dropping pipe, 22 is a second slag dropping pipe, 23 is a distributor, 24 is an expansion compensator, 25 is a lower pressure transmitter, 26 is an isolation valve, 27 is a thermocouple, 28 is an upper pressure transmitter, 3 is a steel strip slag cooler, 30 is a cooling air inlet valve, 31 is a first branch steel strip slag cooler, 32 is a second branch steel strip slag cooler, and 33 is a main steel strip slag cooler; 34 is a shell, 341 is an upper cover plate, 342 is a metal radiating fin, 343 is a cooling water pipe, 344 is an upper cover plate spray device, 345 is an upper cover plate cooling water pipe, 35 is a metal conveyor belt, 351 is a guide roller, 352 is a conveyor belt lower spray device, 353 is a seal brush, 354 is a dust guard, 355 is a side air inlet, 36 is a roller, 37 is a slag thickness adjusting valve, 371 is an adjusting valve body, 372 is an adjusting valve driving unit, 373 is an adjusting valve plate, 374 is an adjusting valve tensioning spring, 38 is a bearing round roller, 39 is a rotary round roller, 4 is a circulating air duct, 41 is a first dust removing device, 410 is a first dust removing inlet valve, 42 is a first dust removing device, 420 is a third dust removing inlet valve, 421 is a second dust removing inlet valve, 43 is a first fan, 430 is a first fan inlet valve, 431 is a first fan outlet valve, 44 is a second fan, 440 is a second fan inlet valve, and 441 is a second fan outlet valve, 45 is a boiler secondary air pipeline, 5 is a boiler tail flue, 51 is a first tail flue cooling air pipeline, 511 is a first cooling air pipeline valve, 52 is a second tail flue cooling air pipeline, 521 is a second cooling air pipeline valve, 53 is a third tail flue cooling air pipeline, 531 is a third cooling air pipeline valve, 6 is a first tensioning device, and 7 is a second tensioning device.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

This patent is to the problem and the shortcoming that above-mentioned technique exists, provides a special device and system of closed slag cooling of metal steel band, transport, processing, and the device and system operation safety and stability, and wearing and tearing are extremely low, and the reliability is high to can loopback into the boiler with most slag heat, realize full automatization, the purpose of environmental protection, resourceful cooling, transport fluidized bed boiler slag.

The utility model discloses in, the slag that circulating fluidized bed boiler produced falls into one or a plurality of confined steel band cold sediment ware's metal conveyor belt through one or a plurality of roots slag pipes on the action of gravity, this confined steel band cold sediment ware 3 of dividing is driven by motor and speed reducer, the in-process that the slag was carried on metal conveyor belt 35, inspiratory ambient cooling air carries out heat exchange with the slag, the slag after the cooling is arranged into in the cold sediment ware of the main steel band in low reaches, heat after the heat transfer that the cooling air carried passes through fan entering boiler overgrate air pipeline recycle. The slag cooling and conveying device has the characteristics of stable operation, energy conservation of more than 40%, low abrasion and maintenance cost and the like.

Example 1:

a schematic system composition diagram of a slag cooling and conveying system of a circulating fluidized bed boiler as shown in fig. 1, which is suitable for cooling, conveying and processing high-temperature slag, and comprises:

a circulating fluidized bed boiler 1, wherein high-temperature slag is generated in the circulating fluidized bed boiler 1; the steel belt slag cooler 3 is communicated with the circulating fluidized bed boiler 1 through a slag dropping pipe 2; the steel strip slag cooler 3 is used for cooling and conveying the high-temperature slag; the circulating air duct 4 is communicated with the tail part of the steel strip slag cooler 3, and an outlet of the circulating air duct 4 is communicated with the circulating fluidized bed boiler 1; the circulating air duct 4 is used for controlling heat exchange between ambient air and the high-temperature slag and recycling heat of the high-temperature slag; and the boiler tail flue 5 is also communicated with the tail part of the steel strip slag cooler 3, and the boiler tail flue 5 is used for guiding the heat of the high-temperature slag into the atmosphere.

The principle of the utility model lies in: the slag (high-temperature slag) generated by the circulating fluidized bed boiler 1 enters the first steel strip slag cooler 31 and the second steel strip slag cooler 32 through one or more slag dropping pipes 2 under the action of the self weight. In the process, because the circulating fluidized bed boiler 1 usually operates under the micro-positive pressure condition, and the first sub steel strip slag cooler 31, the second sub steel strip slag cooler 32 and the main steel strip slag cooler 33 all operate under the micro-negative pressure condition, during the discharge of the boiler slag, the slag is always filled in all the slag falling pipes 2, thereby ensuring the isolation between the circulating fluidized bed boiler 1 and the lower first sub steel strip slag cooler 31 and the lower second sub steel strip slag cooler 32. The utility model discloses in: the slag falling pipe 3 can be used as a channel for boiler slag falling, and can also be used as a barrier between the isolated circulating fluidized bed boiler 1 and the lower distributor 23 through a slag column in the slag falling pipe, so that constant isolation of the two areas is always kept. The slag falling pipe 2 is internally lined with refractory materials or ceramic anti-abrasion materials. In order to prevent potential safety hazards generated near the high-temperature blanking pipe, a heat insulation material or a heat dissipation fin, a safety protection net and the like are arranged outside the blanking pipe 2. The utility model discloses a circulation wind channel 4 can absorb the slag heat through ambient air, returns the heat in circulating fluidized bed boiler 1 again to cool off the slag to safe temperature. After the ambient air in the circulating air duct 4 absorbs and cools the high-temperature slag in the boiler, if the heat is not needed to be recovered to the boiler, the ambient air can be discharged to the tail flue 5 of the boiler along the cooling air duct and then discharged to the atmosphere through a dust remover and a chimney of the boiler.

The beneficial effects of the utility model reside in that: the utility model discloses when handling circulating fluidized bed boiler 1's high temperature slag, at the in-process that high temperature slag carried on metal conveyor belt 35, because there is not relative motion between high temperature slag and the metal conveyor belt 35, metal conveyor belt 35's wearing and tearing can almost be ignored, metal conveyor belt 35's life is on average more than 10 years, is about more than 5 times in the cold sediment ware life-span of cylinder, consequently adopts the utility model discloses the problem that traditional technique equipment wearing and tearing are fast, wearing and tearing are serious has thoroughly been solved to the technique.

The utility model discloses technical boiler slag mainly is cooled off through the inspiratory cooling air from the environment, even at cold sediment ware upper cover plate internally mounted condenser tube, these condenser tube can not direct contact with boiler slag, it is mainly the inside air of cold sediment ware of cooling to cooling air through lower temperature increases the cooling efficiency of fluidized bed high temperature slag, consequently does not have the danger of vapor explosion, can not cause any potential safety hazard to equipment operation and operation personnel. The utility model discloses a circulation wind channel has improved boiler efficiency through the heat is recycled. And the slag heat of the utility model can be discharged to the tail flue 5 of the boiler along the cooling air pipeline under the condition that the partial heat is not necessary to be recycled to the boiler, and is discharged to the atmosphere through the dust remover of the boiler and the chimney.

Example 2:

as an embodiment of the present invention: as shown in fig. 2, the circulating air duct 4 includes a first dust collector 41, a second dust collector 42, a first fan 43, a second fan 44 and a boiler overfire air duct 45; wherein the content of the first and second substances,

the inlet end of the first dust removing device 41 is connected with a first dust removing inlet valve 410;

the inlet end of the second dust removing device 42 is connected with a third dust removing inlet valve 420;

the inlet ends of the first dust removing device 41 and the second dust removing device 42 are also connected with a second dust removing inlet valve 421;

the outlet end of the first dust collector 41 is connected with a first fan inlet valve 430, and the first fan inlet valve 430 is connected with the inlet end of the first fan 43;

the outlet end of the second dust collector 42 is connected with a second fan inlet valve 440, and the second fan inlet valve 440 is connected with the inlet end of the second air 44;

the air outlet of the first fan 43 is connected with a first fan outlet valve 431;

the air outlet of the second fan 44 is connected with a second fan outlet valve 441;

the first fan outlet valve 431 and the second fan outlet valve 441 are both connected with a boiler secondary air pipeline 45, and an air outlet of the boiler secondary air pipeline 45 is connected with the circulating fluidized bed boiler 1.

The principle of the utility model lies in: the utility model discloses install first fan 43, second fan 44 in the system, be the draught fan.

Ambient air enters the metal conveyor belt through the cooling air inlet valve 30, enters the plurality of side air inlets 355 of the metal conveyor belt, sucks in a certain amount of ambient air, reversely exchanges heat with boiler slag on the metal conveyor belt 35 under the action of convection to cool the slag, and meanwhile, the ambient cooling air absorbs the heat to be heated and enters the dust removal device along the first fan inlet valve 410 and the second fan outlet valve 421 (namely, the cooling air inlet valve through which the air can enter).

The first dust removal device 31 and the second dust removal device 32 of the dust removal device, the induced draft fan and the secondary air pipe 5 (or the primary air pipeline) of the boiler recover heat to the circulating fluidized bed boiler 1, and the first dust removal device 31 and the second dust removal device 82 are the same dust removal devices; the heat exchange between the boiler slag and the ambient cooling air is completed in the slag cooler, the temperature of the slag is cooled, if the temperature of the boiler slag reaches a proper temperature (for example, below 120 ℃) after being cooled by the steel strip slag cooler, the boiler slag is only in a stable conveying process after being discharged to the subsequent main steel strip slag cooler 33, and if the temperature of the outlet of the steel strip slag cooler is still higher, the boiler slag can be further cooled in the main steel strip slag cooler (in principle, the same as the principle) until the boiler slag is cooled to a proper safe temperature.

The beneficial effects of the utility model reside in that: ambient air sucked from the cooling air inlet valve exchanges heat with high-temperature furnace slag of the boiler, and the heat absorbed from the furnace slag is recycled to the circulating fluidized bed boiler 1 along the cooling air pipeline through the dust removal device, the draught fan and the secondary air pipeline 45 (or the primary air pipeline) of the boiler, so that the boiler efficiency is improved.

Example 3:

as an embodiment of the present invention: as shown in fig. 2, the first steel strip separating slag cooler 31 cools the air duct 5 through the first tail flue;

the circulating air duct 4 comprises a tail flue 5 connected with the boiler; wherein the content of the first and second substances,

a first cooling air pipeline valve 511 is arranged on the first tail flue cooling air pipeline 51;

the second steel strip separating slag cooler 32 is connected with the boiler tail flue 5 through a second tail flue cooling air pipeline 52; wherein the content of the first and second substances,

a first cooling air pipeline valve 521 is arranged on the second tail flue cooling air pipeline 52;

the main steel strip slag cooler 33 is connected with the boiler tail flue 5 through a third cooling air pipeline 53; wherein the content of the first and second substances,

and a third cooling air pipeline valve 531 is arranged on the third tail flue cooling air pipeline 53.

The principle of the utility model lies in: after the ambient air sucked from the cooling air inlet valve passes through the high-temperature slag of the cooling boiler, if the partial heat is not required to be recycled to the boiler, the partial heat can be discharged to the boiler tail flue 5 along the first tail flue cooling air pipeline 51, the second tail flue cooling air pipeline 52 and the third tail flue cooling air pipeline 53 to the cooling air pipelines, and the cooling air pipeline valve arranged on the tail flue cooling air pipeline controls the entering of the cooling air; is exhausted to the atmosphere through a boiler dust remover and a chimney. In another embodiment: after the ambient air sucked from the cooling air inlet valve passes through the high-temperature slag of the cooling boiler, if the part of heat does not need to be recovered, the ambient air can also pass through a filter matched with a slag bin arranged at the downstream of the main steel strip slag cooler and then is directly discharged to the atmosphere.

The beneficial effects of the utility model reside in that: when the circulating heat does not need to be recovered through the second mode, the furnace slag heat of the part discharged through the cooling air pipeline of the tail flue 5 of the boiler is discharged, and the whole system has the advantages of being simpler in arrangement, low in manufacturing cost, low in operation and maintenance cost and the like.

Example 4:

as an embodiment of the present invention: as shown in fig. 2 and fig. 3, the slag falling pipe 2 at least comprises a first slag falling pipe 21 and a second slag falling pipe 22;

a distributing device 23 is arranged at the bottom of the first slag falling pipe 21 and the second slag falling pipe 22, an expansion compensator 24 is arranged at the upper part of the distributing device 23, and a lower pressure transmitter 25 is arranged at the upper part of the expansion compensator 24; an isolation valve 26 is arranged at the upper part of the lower pressure transmitter 25, a thermocouple 27 is arranged above the isolation valve 26, and an upper pressure transmitter 28 is arranged above the thermocouple 27.

The principle of the utility model lies in: the slag produced by the circulating fluidized bed boiler is discharged into a distributor 23 at the lower part through one or a plurality of slag blanking pipes (the slag blanking pipes 2) under the action of the self weight through an isolation valve 26 and an expansion compensator 24, because the circulating fluidized bed boiler 1 usually works under the micro-positive pressure working condition, and the steel strip slag cooler operates under the micro-negative pressure condition, the slag of the boiler is always filled in the slag blanking pipes in the discharging process, thereby ensuring the isolation between the circulating fluidized bed boiler 1 and the steel strip slag cooler 3 at the lower part.

In actual operation, when the slag discharging speed of the steel strip slag cooler 3 is higher than the slag producing speed of the fluidized bed boiler 1 and the material level in the slag discharging pipe is lower, namely the differential pressure between the position of the upper pressure transmitter 28 and the position of the lower pressure transmitter 25 is lower than a set safety value, the differential pressure signal controls the running speed of the metal conveying belt 35 of the steel strip slag cooler through the frequency converter, so that the optimal material layer thickness on the conveying belt is adjusted. Therefore, the slag thickness adjusting valve 37 installed on the upper part of the steel strip slag cooler can be used for setting the maximum slag amount (coarse adjustment of slag thickness), and the specific thickness of the slag can also be used for realizing the dynamic automatic adjustment (fine adjustment) of the optimal material layer by changing the speed of the metal conveying belt through a frequency converter arranged on the steel strip slag cooler according to a level indicator (the level indicator can also be installed during actual operation) in a slag falling pipe and an upper and lower differential pressure signal. In addition, the distance between the lower end of the distributor 23 and the metal conveyer belt 35 of the downstream steel belt slag cooler is ensured to ensure the maximum boiler slag passing. The expansion and contraction of the fluidized bed boiler 1 under the working conditions of cold state and hot state is realized by the expansion compensator 24 installed on the upper part of the distributor 23. When the expansion compensator 24 and the downstream equipment need to be serviced, the isolation valve 26 arranged on the slag falling pipe can be closed, thereby ensuring the safety of the operation and maintenance work.

The beneficial effects of the utility model reside in that: the slag falling pipe 2 of the utility model can be used as a channel for boiler slag falling, and can also be used as a barrier between the isolated fluidized bed boiler 1 and the lower distributor 23 through a slag column in the slag falling pipe 2, so that the constant isolation of the two areas is always kept; and the utility model discloses in arrange the speed that sediment speed is greater than the sediment of circulating fluidized bed boiler 1 production, when the material level ratio in the sediment pipe 2 is lower, when the differential pressure between 28 positions of last pressure transmitter and the 25 positions of lower pressure transmitter is less than the safe value of settlement promptly, thereby this differential pressure signal can realize through the functioning speed of converter control steel band cold sediment ware metal conveyor belt 35 that the best bed of material thickness is adjusted on the conveyer belt.

Example 5:

as an embodiment of the present invention: the slag falling pipe 2 is internally lined with refractory materials or ceramic anti-abrasion materials, and is externally provided with heat insulation materials, radiating fins and a safety protection net.

The beneficial effects of the utility model reside in that: the refractory material or ceramic wear-resistant material can increase the service life of the slag falling pipe. The heat insulating material prevents high temperature from affecting the working state and efficiency of other parts. The heat dissipation fins can dissipate heat dissipated by the slag falling pipe quickly, and the safety protection net can prevent an external accident from damaging the slag falling pipe and can also prevent the slag falling pipe from being touched by mistake.

Example 6:

as an embodiment of the present invention: as shown in fig. 2, fig. 3 and fig. 6, the first slag cooler 31, the second slag cooler 32 and the main steel-strip slag cooler 33 are all composed of a shell 34, a metal conveyor belt 35 and a roller 36; wherein the content of the first and second substances,

an upper cover plate 341 is arranged on the upper part of the shell 34;

the metal conveyor belt 35 and the roller 36 are arranged inside the shell 34, and the metal conveyor belt 35 is sleeved outside the roller 36; wherein the content of the first and second substances,

the number of the rollers 36 is at least two;

the metal conveyer belts 35 of the first steel strip slag cooler 31 and the second steel strip slag cooler 32 are also provided with a slag thickness regulating valve 37;

the slag thickness regulating valve 37 comprises a regulating valve body 371, a regulating valve driving unit 372, a regulating valve plate 373 and a regulating valve tensioning spring 374; wherein the content of the first and second substances,

the regulating valve driving unit 372 is arranged at the top of the regulating valve body 371, the regulating valve plate 373 and the regulating valve tensioning spring 374 are arranged inside the regulating valve body 371, and two ends of the regulating valve tensioning spring 374 are connected with the upper end and the lower end of the regulating valve plate 373;

the lower part of the metal conveying belt 35 in the working running direction is supported by a plurality of bearing circular supporting rollers 38 along the whole width of the conveying belt;

two sides of the lower part of the metal conveying belt 35 in the return direction are supported by a rotary round supporting roller 39;

guide rollers 351 are arranged on two sides of the metal conveying belt 35 in the working direction and the return direction;

the lower part of the metal conveying belt 35 is provided with a conveying belt lower spraying system 352. On the return side of the metal conveyor belt 35, the metal conveyor belt 35 can be atomized, sprayed and cooled by the lower spraying device 352 of the metal conveyor belt, so that the temperature of the metal conveyor belt 35 is reduced, more heat is taken away in the contact and conduction process of the metal conveyor belt and the fluidized bed high-temperature slag, in the lower spraying device process, the boiler high-temperature slag and the metal conveyor belt 35 transfer the heat to spraying water mist, the spraying water mist is rapidly evaporated, and the problem of water condensation at the outlet of the main steel belt slag cooler is solved.

The principle of the utility model lies in: the utility model discloses the in-process that fluidized bed high temperature furnace sediment carried on metal conveyor belt 35, metal conveyor belt 35 work traffic direction lower part is supported by a plurality of bearing circle bearing rollers 38 along whole conveyer belt width, metal conveyor belt 35 rolls the operation on bearing circle bearing roller 38, frictional force between the two is very little, guaranteed like this that metal conveyor belt 35 has very long life, both sides in metal conveyor belt 35's return stroke direction lower part are supported by gyration circle bearing roller 39, guide roll 351 is installed in the equal design in metal conveyor belt 35 work direction and return stroke direction's both sides, monitor and prevent metal conveyor belt 35 off tracking.

The upper cover plate 341 of the slag cooler is internally provided with a cooling water pipe for increasing the cooling efficiency of the high-temperature slag of the fluidized bed. Slag thickness governing valve 37 is installed in the low reaches of distributing device 23, the utility model discloses in according to the maximum slag discharge amount of circulating fluidized bed boiler design and metal conveyor belt 35's effective width, material layer thickness when combining metal conveyor belt 35's normal operating speed to calculate the maximum slag discharge amount can tentatively set for slag material layer thickness through the distance between adjustment valve plate 373 and the lower part metal conveyor belt 35.

The beneficial effects of the utility model reside in that: after the slag discharged by the distributing device 23 passes through the adjusting valve plate 373, the slag can be uniformly spread on the width direction of the whole metal conveying belt 35, so that the heat exchange areas of convection, heat radiation and heat conduction between a slag material layer and the upper part and the lower part are increased, and the heat exchange effect is greatly improved. The slag thickness regulating valve 37 can not only regulate the thickness of the slag layer, but also have the function of leveling the slag layer. When large-size slag cannot pass through the space between the adjusting valve and the metal conveyor belt, under the driving force of the running metal conveyor belt, the large-size slag overcomes the tension force of the adjusting valve tensioning spring 374 to push the adjusting valve plate 373 to rotate towards the running direction of the metal conveyor belt 35, so that the large-size slag can pass through, and then under the action force of the tensioning spring 374, the adjusting valve plate 373 is restored to the original position. The slag thickness regulating valve driving unit 372 may be designed to be driven by hand, pneumatic, electric or other driving means as required.

Example 7:

as an embodiment of the present invention: as shown in fig. 3 and fig. 6, the upper cover plates 341 and both sides of the first slag cooler 31, the second slag cooler 32 and the main steel strip slag cooler 33 are provided with metal heat dissipation fins 342, and the upper cover plates 341 are internally provided with cooling water pipes 343;

the middle part of the upper cover plate 341 is provided with an upper cover plate spraying device 344; the upper cover plate spray device 344 is positioned right above the metal conveyor belt 35, and the upper cover plate spray device 344 is supplied with water by the cooling water pipe 343.

The utility model discloses a principle and beneficial effect lie in: in order to increase the cooling effect of the boiler slag in the steel strip slag cooler and the main steel strip slag cooler, the upper cover plate 341 and the two sides of the slag cooler are provided with the metal radiating fins 342, the upper cover plate spray device 344 is arranged right above the metal conveying belt 35, when the boiler slag amount is large and the slag layer is thick, the slag at the bottom of the metal conveying belt is difficult to cool, and at the moment, the upper cover plate spray device 344 is started, so that the temperature of the slag can be effectively reduced. The utility model discloses technical boiler slag mainly is cooled off through the inspiratory cooling air from the environment, does not have the consumption of water basically, even start water spray set under the condition of large capacity slag, because water is atomizing, all by the hot-air evaporation, does not have the water to condense, therefore the water yield consumption is very little, can ignore almost.

Example 8:

as an embodiment of the present invention: as shown in fig. 6, sealing brushes 353 are further installed inside the first slag cooler 31, the second slag cooler 32 and the main steel strip slag cooler 33; gaps are reserved between the bottom and the side faces of the sealing brushes 353 and the metal conveying belt 435; the sealing brush 353 is made of high-temperature-resistant metal or nonmetal;

and a dust-proof plate 354 is arranged between the working operation layer and the return stroke of the metal conveying belt 35.

The side surface of the steel strip slag cooler 3 is also provided with a side surface air inlet 355.

The utility model discloses a principle and beneficial effect lie in: the sealing brushes 353 (the material of the sealing brushes can be high-temperature-resistant metal or nonmetal) are arranged at the lower parts of the material guide plates in the steel strip separating slag cooler and the main steel strip slag cooler 33, and certain proper gaps are kept between the bottoms and the side surfaces of the sealing brushes 353 and the metal conveying belt 35 to prevent fine slag particles from falling to the bottom of the slag cooler. The dust guard 354 is installed between the working layer and the return of the metal conveyer belt 35, so that the ultrafine slag particles diffused in the slag cooler can be prevented from falling into the return metal conveyer belt. Meanwhile, the lower parts of the steel belt separating slag cooler and the main steel belt slag cooler can be provided with a fine material cleaning device, and the cleaning device can be of a chain scraper structure or adopts a self-cleaning spatula connected with a metal conveying belt.

Example 9:

as an embodiment of the present invention: as shown in fig. 7, the first and second tensioning devices 6 and 7 are arranged at the tail parts of the first and second steel strip slag coolers 31, 32 and 33; wherein the content of the first and second substances,

the first tensioning device 6 is a pneumatic tensioning device or a hydraulic tensioning device;

the second tensioning device 7 is a mechanical tensioning device.

The principle of the utility model lies in: when boiler slag is conveyed on the upper portion of the metal conveying belt 35, the temperature of the boiler slag absorbed by the boiler slag is increased under the action of heat conduction, so that the whole metal conveying belt 35 is expanded, a pneumatic or hydraulic tensioning device or a mechanical tensioning device arranged at the tail portion of the steel belt slag cooler pushes a tail roller in a roller 36 to continuously tension the whole metal conveying belt 35, so that the thermal expansion quantity is absorbed, and the tensioning device pushes the tail roller in the opposite direction to absorb the contraction quantity of the metal conveying belt when the temperature of the metal conveying belt is reduced, so that the whole metal conveying belt 35 is always kept at a constant set tension force.

Example 10:

as an embodiment of the present invention: the system realizes the cooling, conveying and processing of the high-temperature slag by the following steps:

step 1: high-temperature slag in the circulating fluidized bed boiler 1 enters the slag falling pipe 2 under the action of self gravity;

step 2: the expansion compensator 24 of the slag falling pipe 2 performs contraction or expansion compensation on the slag falling pipe 2 according to the cold condition and the hot condition of the circulating fluidized bed boiler 1;

and step 3: after the slag falling pipe 2 is subjected to shrinkage or expansion compensation, the high-temperature slag falls into a metal conveying belt 35 of the steel strip slag cooler through the distributor 23;

and 4, step 4: when the high-temperature slag falls on the metal conveyor belt 35, the slag thickness regulating valve 37 calculates the material layer thickness at the maximum slag discharge amount according to the maximum slag discharge amount designed by the circulating fluidized bed boiler 1 and the effective width of the metal conveyor belt 35 in combination with the normal operating speed of the metal conveyor belt 35, and sets the slag material layer thickness by adjusting the distance between the regulating valve plate 373 and the lower metal conveyor belt 35;

and 5: controlling the upper cover plate spraying device 344 and the conveyor belt lower spraying device 352 to atomize, spray and cool the metal conveyor belt 35 according to the thickness of the slag layer;

step 6: when the heat generated after cooling the high-temperature slag and the metal conveyor belt 35 in the step 5 needs to be recycled through the circulating air duct 4, performing a step 7; when the heat generated after cooling the high-temperature slag and the metal conveyer belt 35 in the step 5 is not required to be recovered, and is required to be introduced into the atmosphere through the boiler tail flue 5, executing a step 8;

and 7: the first induced draft fan 43 or the first induced draft fan 44 introduces ambient air through the side air inlet 355, the ambient air with heat in the steel strip separating slag cooler is dedusted by the first dedusting device 41 or the second dedusting device, and then is introduced into the boiler secondary air pipeline 45 through the first induced draft fan 43 or the second induced draft fan 44 and enters the circulating fluidized bed boiler 1 until the high-temperature slag is cooled to a proper safe temperature;

and 8: first draught fan 43 or first draught fan 44 passes through side air intake 355 introduces ambient air, and ambient air takes the heat in the cold sediment ware of branch steel strip is along arranging to boiler afterbody flue 5 to afterbody flue cooling air duct, discharges to atmosphere through boiler dust remover, chimney.

The utility model discloses a principle and beneficial effect lie in: the in-process that fluidized bed high temperature slag carried on metal conveyor belt 35, because there is not relative motion between slag and the metal conveyor belt, metal conveyor belt's wearing and tearing can be ignored almost, metal conveyor belt's life is on average more than 10 years, is about more than 5 times in the cold sediment ware life-span of cylinder, consequently adopts the utility model discloses the technique has thoroughly solved the problem that traditional technology equipment wearing and tearing are fast, wearing and tearing are serious. The boiler slag is mainly cooled by cooling air sucked from the environment, even if cooling water pipes are arranged in the upper cover plate of the slag cooler, the cooling water pipes are not in direct contact with the boiler slag and mainly cool the air in the slag cooler, so that the cooling effect of the high-temperature slag of the fluidized bed is improved by the cooling air with lower temperature, the danger of water vapor explosion is avoided, and any potential safety hazard to equipment operation and operating personnel is avoided; ambient air sucked by cooling air is subjected to heat exchange with high-temperature furnace slag of the boiler, and a large amount of heat energy absorbed from the furnace slag is recycled to the circulating fluidized bed boiler along a cooling air pipeline through a dust removal device, an induced draft fan and a secondary air pipeline (or a primary air pipeline) of the boiler, so that the boiler efficiency is improved. Boiler slag is mainly cooled by cooling air sucked from the environment, and basically has no water consumption, even if a water spraying device is started under the condition of large-capacity slag, because water is atomized, all water is evaporated by hot air, and no water is condensed, the water consumption is very small and can be almost ignored.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A circulating fluidized bed boiler slag cooling transport system adapted for cooling, transporting and processing high temperature slag, comprising:

a circulating fluidized bed boiler (1), wherein high-temperature slag is generated inside the circulating fluidized bed boiler (1);

the steel belt slag cooler (3), the steel belt slag cooler (3) is communicated with the circulating fluidized bed boiler (1) through a slag dropping pipe (2); the steel strip slag cooler (3) is used for cooling and conveying the high-temperature slag;

the circulating air duct (4), the circulating air duct (4) is communicated with the tail part of the steel strip slag cooler (3), and the outlet of the circulating air duct (4) is communicated with the circulating fluidized bed boiler (1); the circulating air duct (4) is used for controlling the heat exchange between the ambient air and the high-temperature slag and recycling the heat of the high-temperature slag;

the steel strip slag cooler is characterized by comprising a boiler tail flue (5), wherein the boiler tail flue (5) is communicated with the tail of the steel strip slag cooler (3), and the boiler tail flue (5) is used for discharging cooling air subjected to heat exchange with high-temperature slag to the atmosphere through a dust remover.

2. The circulating fluidized bed boiler slag cooling transport system of claim 1, wherein:

the circulating air duct (4) comprises a first dust removal device (41), a second dust removal device (42), a first fan (43), a second fan (44) and a boiler secondary air pipeline (45); wherein the content of the first and second substances,

the inlet end of the first dust removing device (41) is connected with a first dust removing inlet valve (410);

the inlet end of the second dust removal device (42) is connected with a third dust removal inlet valve (420);

the inlet ends of the first dust removing device (41) and the second dust removing device (42) are also connected with a second dust removing inlet valve (421);

the outlet end of the first dust removal device (41) is connected with a first fan inlet valve (430), and the first fan inlet valve (430) is connected with the inlet end of the first fan (43);

the outlet end of the second dust removal device (42) is connected with a second fan inlet valve (440), and the second fan inlet valve (440) is connected with the inlet end of the second fan (44);

the air outlet of the first fan (43) is connected with a first fan outlet valve (431);

the air outlet of the second fan (44) is connected with a second fan outlet valve (441);

the first fan outlet valve (431) and the second fan outlet valve (441) are both connected with a boiler secondary air pipeline (45), and an air outlet of the boiler secondary air pipeline (45) is connected with the circulating fluidized bed boiler (1).

3. The circulating fluidized bed boiler slag cooling transport system of claim 1, wherein:

the steel belt slag cooler (3) comprises a steel belt separating slag cooler and a main steel belt slag cooler (33);

the steel strip separating slag cooler at least comprises a first steel strip separating slag cooler (31) and a second steel strip separating slag cooler (32);

the first steel strip separating slag cooler (31) is connected with the boiler tail flue (5) through a first tail flue cooling air pipeline (51); wherein the content of the first and second substances,

a first cooling air pipeline valve (511) is arranged on the first tail flue cooling air pipeline (51);

the second steel strip separating slag cooler (32) is connected with the boiler tail flue (5) through a second tail flue cooling air pipeline (52); wherein the content of the first and second substances,

a second cooling air pipeline valve (521) is arranged on the second tail flue cooling air pipeline (52);

the main steel strip slag cooler (33) is connected with the boiler tail flue (5) through a third tail flue cooling air pipeline (53); wherein the content of the first and second substances,

and a third cooling air pipeline valve (531) is arranged on the third tail flue cooling air pipeline (53).

4. The circulating fluidized bed boiler slag cooling transport system of claim 1, wherein:

the slag falling pipe (2) at least comprises a first slag falling pipe (21) and a second slag falling pipe (22);

a distributing device (23) is arranged at the bottom of the first slag falling pipe (21) and the second slag falling pipe (22), an expansion compensator (24) is arranged at the upper part of the distributing device (23), and a lower pressure transmitter (25) is arranged at the upper part of the expansion compensator (24); lower pressure transmitter (25) upper portion is provided with isolating valve (26), isolating valve (26) left side is provided with thermocouple (27), thermocouple (27) top is provided with pressure transmitter (28).

5. The circulating fluidized bed boiler slag cooling transport system of claim 1, wherein:

the slag falling pipe (2) is internally lined with refractory materials or ceramic anti-abrasion materials, and is externally provided with heat insulation materials, radiating fins and a safety protection net.

6. The circulating fluidized bed boiler slag cooling conveying system of claim 3, wherein:

the first steel strip slag cooler (31), the second steel strip slag cooler (32) and the main steel strip slag cooler (33) are all composed of a shell (34), a metal conveyer belt (35) and a roller (36); wherein the content of the first and second substances,

an upper cover plate (341) is arranged at the upper part of the shell (34);

the metal conveying belt (35) and the roller (36) are arranged inside the shell (34), and the metal conveying belt (35) is sleeved outside the roller (36); wherein the content of the first and second substances,

at least two rollers (36);

the metal conveyer belts (35) of the first steel strip slag cooler (31) and the second steel strip slag cooler (32) are also provided with slag thickness regulating valves (37);

the slag thickness regulating valve (37) comprises a regulating valve body (371), a regulating valve driving unit (372), a regulating valve plate (373) and a regulating valve tensioning spring (374); wherein the content of the first and second substances,

the regulating valve driving unit (372) is arranged at the top of the regulating valve body (371), the regulating valve plate (373) and the regulating valve tensioning spring (374) are arranged inside the regulating valve body (371), and two ends of the regulating valve tensioning spring (374) are connected with the upper end and the lower end of the regulating valve plate (373);

the lower part of the metal conveying belt (35) in the working running direction is supported by a plurality of bearing circular carrier rollers (38) along the whole width of the conveying belt;

two sides of the lower part of the metal conveying belt (35) in the return direction are supported by a rotary round supporting roller (39);

guide rollers (351) are arranged on two sides of the working direction and the return direction of the metal conveying belt (35);

and a lower conveyor belt spraying device (352) is arranged at the lower part of the metal conveyor belt (35).

7. The circulating fluidized bed boiler slag cooling conveying system of claim 3, wherein:

the upper cover plates (341) and the two sides of the first steel strip slag cooler (31), the second steel strip slag cooler (32) and the main steel strip slag cooler (33) are provided with metal radiating fins (342), and an upper cover plate cooling water pipe (345) is arranged in the upper cover plate (341);

the middle part of the upper cover plate (341) is provided with an upper cover plate spraying device (344); the upper cover plate spraying device (344) is positioned right above the metal conveying belt (35), and the upper cover plate spraying device (344) is supplied with water by a cooling water pipe (343).

8. The circulating fluidized bed boiler slag cooling conveying system of claim 3, wherein:

sealing brushes (353) are further mounted inside the first steel strip slag cooler (31), the second steel strip slag cooler (32) and the main steel strip slag cooler (33); gaps are formed between the bottom and the side faces of the sealing brush (353) and the metal conveying belt (35); the sealing brush (353) is made of high-temperature-resistant metal or nonmetal;

a dust guard (354) is arranged between the working operation layer and the return stroke of the metal conveyor belt (35);

and a side air inlet (355) is also formed in the side surface of the steel strip slag cooler (3).

9. A circulating fluidized bed boiler slag cooling conveying system according to claim 3, characterized in that the first and second tensioning devices (6, 7) are arranged at the tail parts of the first and second sub-steel strip slag coolers (31, 32) and the main steel strip slag cooler (33); wherein the content of the first and second substances,

the first tensioning device (6) is a pneumatic tensioning device or a hydraulic tensioning device;

the second tensioning device (7) is a mechanical tensioning device.

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