CN212274666U

CN212274666U - Low-resistance cement kiln tail flue gas waste heat recovery boiler

Info

Publication number: CN212274666U
Application number: CN202020518206.4U
Authority: CN
Inventors: 金万金
Original assignee: Dalian 95 Hi Tech New Energy Development Co ltd
Current assignee: Dalian 95 Hi Tech New Energy Development Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-01-01
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to a low resistance cement kiln tail flue gas waste heat recovery boiler, boiler body from flue gas entry flue to exhanst gas outlet flue is equipped with the over heater in proper order, evaporimeter I, evaporimeter II, evaporimeter III, the economizer, the heat-transfer pipe of above-mentioned part adopts novel extension to receive the hot side, novel extension receives the structure of hot side and has increased the short fin of ring type for following the equidistance of circumferencial direction at the pipe, because receive hot side extension, same space, under the same heat transfer capacity, the required novel extension receives the weight (and quantity) of hot side to become less, so their interval of arranging can increase, thereby reduced the flue gas resistance promptly, the weight of boiler has alleviateed again, can improve the heat exchange efficiency of boiler, reduce the investment cost of boiler, reduce the working costs of boiler.

Description

Low-resistance cement kiln tail flue gas waste heat recovery boiler

Technical Field

The utility model relates to a cement kiln tail flue gas waste heat recovery boiler, in particular to can reduce cement kiln tail flue gas resistance's waste heat recovery boiler.

Background

In the pure low temperature waste heat power generation field of cement kiln, exhaust-heat boiler uses extensively, and in the actual production process, traditional exhaust-heat boiler's heat transfer part all adopts the metal tube bank structure of smooth surface, and in order to guarantee the make full use of cement kiln tail flue gas waste heat, the heat transfer surface of over heater, evaporimeter, economizer in the boiler needs to comprise multiunit metal tube bank to provide sufficient heat transfer area, therefore boiler furnace body weight is very big. In addition, because the heat exchange tube bundles are more and are densely arranged, the on-way resistance of the flue gas in the boiler is very large, and the utilization rate of the heat energy of the flue gas is not high.

In addition, in the cement clinker production process, the temperature of the flue gas discharged by the kiln tail preheater is 260-340 ℃, the dust concentration is high, the adhesion of dust is strong, and after long-term operation, the dust adheres to the outer surface of a heating surface pipe of the boiler to different degrees, so that the dirt thermal resistance of a heat exchange surface is increased, the heat transfer efficiency of the waste heat boiler is reduced, the heat exchange capacity of the whole system is attenuated year by year, and the operation rate of the equipment is lower and lower.

Disclosure of Invention

Aiming at the defects of the prior art, the invention solves the technical problem of providing the low-resistance cement kiln tail flue gas waste heat recovery boiler, the heat transfer pipe with the novel extended heating surface structure is adopted, the heat exchange capacity of the heat exchange pipe in a unit space is obviously improved, the ventilation resistance of the kiln tail boiler can be reduced due to the increase of the interval of the heat exchange pipe, and meanwhile, the flow guide of the novel extended heating surface structure to flue gas can equalize the distribution of ash, so that the flue gas is uniformly distributed in the flue gas, and the low-resistance cement kiln tail flue gas waste heat recovery boiler has the performance of preventing ash deposition, thereby reducing the operating cost of the boiler.

The technical scheme adopted by the invention is as follows: a low-resistance cement kiln tail flue gas waste heat recovery boiler comprises a flue gas inlet, a superheater, an evaporator I, an evaporator II, an evaporator III, an economizer, a flue gas outlet, a steel frame, a platform staircase, a vibration ash removal device, a sound wave ash removal device, a downcomer, an ascending pipe and a boiler barrel, wherein the superheater, the evaporator I, the evaporator II, the evaporator III and the economizer are sequentially arranged in a boiler body from a flue gas inlet flue to a flue gas outlet flue, and the superheater, the evaporator I, the evaporator II, the evaporator III and a heat transfer pipe of the economizer adopt a novel expansion heating surface.

The short fins are circular ring bodies extending along the circumferential direction of the hollow circular tube.

The short fins are uniformly distributed on the outer circumference of the hollow circular tube along the axial direction.

The short fins are arranged in the circumferential direction of the hollow circular tube at equal intervals.

The short fins and the hollow round pipe are integrally formed.

The superheater, the evaporator I, the evaporator II, the evaporator III and the economizer all adopt modular independent box structures, double-layer guard plates are adopted outside the box bodies, and a ventilation hanging device is arranged on the upper portion of each box body.

The ventilation hanging device is of a hollow square tube structure, and a square tube is communicated with the outside of the boiler.

The rapping dust cleaning device and the sound wave dust cleaning device are respectively arranged on the lower part and the upper part of the superheater, the evaporator I, the evaporator II, the evaporator III and the economizer.

The heat transfer pipes of the superheater, the evaporator I, the evaporator II, the evaporator III and the economizer are horizontally arranged, and the pipe bundle is arranged in an in-line structure.

The operation principle of the low-resistance cement kiln tail flue gas waste heat recovery boiler is as follows: high-temperature flue gas enters the boiler body through the flue gas inlet, then passes through the superheater, evaporator I, evaporator II, evaporator III, the economizer heat transfer in proper order after, and the flue gas temperature reduces, and the back is discharged through the exhanst gas outlet.

Boiler softened water enters a coal economizer heat exchange tube through a coal economizer inlet, after being heated by smoke outside the tube, the boiler softened water enters a boiler barrel from a coal economizer outlet through a water supply tube connected with the coal economizer, then enters an inlet header of an evaporator group through a downcomer at the bottom of the boiler barrel, after being heated by smoke outside the tube of the heat exchanger group, the boiler softened water enters the boiler barrel from an evaporator group outlet header through an ascending tube connected with the evaporator group, separated saturated steam enters an inlet of a superheater through a main steam pipeline at the top of the boiler barrel, and after being further heated by the smoke outside the tube in a steam section heat exchange tube of the superheater, superheated steam is formed and then is output from an outlet of the superheater.

The superheater, the evaporator I, the evaporator II, the evaporator III and the economizer are all independent box structures, the structure is composed of a box body with double layers of protective plates on the periphery and an internal heat exchange element, wherein the heat exchange element adopts a novel extended heating surface, the novel extended heating surface is provided with annular short fins at equal intervals along the circumferential direction of a hollow circular tube, and the fins and the hollow circular tube are integrally formed.

The invention has the advantages that the heating surfaces of the heat exchange tubes of the superheater, the evaporator I, the evaporator II, the evaporator III and the economizer are provided with the circular ring type short fins at equal intervals along the circumferential direction of the hollow circular tube, because the circular ring type short fins are increased, the heating area is expanded, the weight (and the number) of the required novel expanded heating surfaces is reduced in the same space and under the same heat exchange quantity, the arrangement interval of the heat exchange tubes can be increased, and therefore, the ventilation resistance of the smoke in the boiler is reduced. And the fins and the hollow circular tube are integrally formed, so that the fins are consistent with the crystal form of the base tube, cracks are not easy to generate, the heat conduction coefficient is high, the heat transfer effect is good, and the required number of the tubes is saved, thereby reducing the smoke resistance and the weight of the boiler. Because the resistance of the boiler is reduced, in the applied system, the configuration of the fan selected by the induced draft of the boiler can be reduced, and the manufacturing cost of the whole system is reduced. And the whole weight of the boiler is reduced, and the requirements on the material of a steel frame and a platform for supporting the whole boiler can be correspondingly reduced, so that the construction cost is saved.

The novel structure of the expanded heating surface is that circular ring type short fins are arranged on the circular tube at equal intervals along the circumferential direction, so that the flow guide of the flue gas can equalize the distribution of ash, the flue gas is uniformly distributed, the generation of a door clamping vortex phenomenon is avoided, and the novel expanded heating surface has the performance of preventing ash deposition, so that the dirt thermal resistance of the heat exchange surface is small, the heat exchange capacity of a system is not easy to attenuate, the service life of a boiler is long, the required maintenance is less, and the operation rate of equipment is greatly improved.

Superheater, evaporimeter I, evaporimeter II, evaporimeter III, economizer all are modular independent box structure, and this structure comprises box and the inside heat transfer component of peripheral double-deck backplate, and the volume of leaking wind of the boiler system that modular factory processing was assembled owing to the stable quality of processing technology, modular box after the processing was assembled significantly reduces, makes boiler sealing performance better, has further improved the heat utilization rate of hot-blast flue gas.

Contain a large amount of smoke and dust in the cement kiln tail flue gas, in boiler working process, the smoke and dust is cohered gradually on the heat-transfer pipe on the surface, long-term deposition will increase the dirt thermal resistance of heat-transfer pipe, reduce heat exchange efficiency, through at the over heater, evaporimeter I, evaporimeter II, evaporimeter III, the upper portion installation sound wave ash removal device of economizer, lower part installation shakes and beats ash removal device, a dust for driving the deposit on the heat-transfer pipe, the deposition phenomenon of heat-transfer pipe can effectively be reduced, reduce heat transfer resistance, guarantee the heat exchange efficiency of heat-transfer pipe, boiler life is prolonged.

The heat transfer tubes of the heat exchange elements are horizontally arranged, the tube bundle arrangement adopts an in-line structure to be favorable for the ash removal operation, the arrangement mode of the heat transfer tubes can ensure that dust in flue gas directly sinks from the heat transfer tubes and is not easy to gather on the heat transfer tubes, the heat resistance is favorably reduced, and the heat transfer efficiency of the heat transfer tubes is kept for a long time.

Drawings

FIG. 1 is a schematic front view of the present invention.

FIG. 2 is a schematic cross-sectional view of the novel extended heating surface of the present invention.

Labeled as:

the device comprises a flue gas inlet 1, a superheater 2, an evaporator I31, an evaporator II 32, an evaporator III 33, a coal economizer 4, a flue gas outlet 5, a rapping ash removal device 6, a sound wave ash removal device 7, a downcomer 8, an ascension pipe 9, a boiler barrel 10, a hollow circular pipe 11 and fins 12.

Detailed Description

The following is further described with reference to the accompanying drawings.

As shown in figure 1, the low-resistance cement kiln tail flue gas waste heat recovery boiler comprises a flue gas inlet 1, a superheater 2, an evaporator I31, an evaporator II 32, an evaporator III 33, an economizer 4, a flue gas outlet 5, a rapping ash removal device 6, a sound wave ash removal device 7, a downcomer 8, an ascending pipe 9 and a boiler barrel 10, wherein the superheater 2, the evaporator I31, the evaporator II 32, the evaporator III 33 and the economizer 4 are sequentially arranged in a boiler body according to the direction of a flue from the flue gas inlet to the flue gas outlet, the novel expansion heating surface adopts a novel expansion heating surface, the section of the novel expansion heating surface is shown in figure 2, the novel expansion heating surface adopts a structure that ring-shaped short fins 12 are arranged on a hollow circular pipe 11 at equal intervals along the circumferential direction, the short fins 12 are made of materials with the same mass and thickness in a ring shape, and compared with other shapes, the ring-shaped heat transfer pipe has the largest surface area, the effect brought by the application on the heat transfer pipe is that the heat transfer area can be expanded to the utmost extent to the short fin of ring type, improves heat transfer efficiency. In addition, the fins are not welded on the hollow circular tube but integrally formed with the hollow circular tube, so that the fins are consistent with crystals of the base tube, cracks are not easy to generate, the heat exchange coefficient is high, and because the heating surface is expanded, the weight (and the number) of the required novel expanded heating surface is reduced under the same space and the same heat exchange amount, the arrangement distance of the heating surface and the heating surface can be increased, thereby reducing the smoke wind resistance and the weight of the boiler. Because the smoke resistance of the boiler is reduced, the configuration of a fan selected by induced draft of the boiler can be reduced, and the manufacturing cost of the whole system is reduced. And the weight of the boiler is reduced, so that the requirements on the material of a steel frame and a platform matched with the boiler are correspondingly reduced, and the cost of the system is further reduced.

The novel structure of the expanded heating surface is that circular ring type short fins are arranged on the circular tube at equal intervals along the circumferential direction, so that the flow guide of the flue gas can equalize the distribution of ash, the flue gas is uniformly distributed, the generation of a gate vortex phenomenon is avoided, and the novel expanded heating surface has the performance of preventing ash deposition, so that the dirt thermal resistance of the heat exchange surface is small, the heat exchange capacity of the system is not easy to attenuate, the service life is long, the required maintenance is less, and the operation rate of equipment is greatly improved.

The superheater, evaporimeter I, evaporimeter II, evaporimeter III, the economizer all adopts the independent box structure of modularization, this structure comprises box and the inside heat transfer component of peripheral double-deck backplate, the leakproofness of box can be guaranteed well in the factory work of modularization box, make the boiler air leakage volume greatly reduced who assembles by the modularization box, thereby reduce the heat energy of hot-blast flue gas and scatter and disappear, the heat energy utilization ratio of hot-blast flue gas has further been improved, boiler furnace body air leakage phenomenon because traditional on-the-spot welding technology is unstable has been avoided causing. The box body modularized boiler is convenient and fast to assemble, and the time for assembling the boiler is greatly saved.

The upper part of each modularized box body is provided with a ventilation hanging device which is used for hanging and fixing a heating surface, but in the working process of the boiler, the hanging device of the heating surface of the boiler is directly contacted with high-temperature flue gas, steel materials can be softened when the temperature is high, in order to maintain the strength of the steel materials, the ventilation hanging device in the box body of the boiler adopts a square tube type structure, cold air outside the boiler is communicated in a tube, and the temperature of the hanging device is reduced through the cold air, so that the strength of the ventilation hanging device can be maintained.

The sound wave ash removal device and the rapping ash removal device are respectively installed on the upper portion and the lower portion of the heat exchange element, and the two ash removal devices are mutually matched and used for removing dust adhered on the heat transfer pipe, reducing the dust deposition phenomenon of the heat transfer pipe, reducing the heat exchange resistance, ensuring the heat exchange efficiency of the boiler and prolonging the service life of the boiler.

The heat transfer pipe of the heat exchange element is horizontally arranged, the pipe bundle is arranged in an in-line structure, the structure is favorable for direct sinking of dust in flue gas from gaps among the heat transfer pipes, dust deposited on the heat transfer pipes is reduced, ash removal operation is easy to perform, heat resistance of the heat transfer pipes is reduced, high heat transfer efficiency of the heat transfer pipes can be kept for a long time, maintenance cost is reduced, and the service cycle of the boiler is prolonged.

Claims

1. The utility model provides a low resistance cement kiln tail flue gas waste heat recovery boiler, including flue gas inlet (1), over heater (2), evaporimeter I (31), evaporimeter II (32), evaporimeter III (33), economizer (4), exhanst gas outlet (5), shake and beat ash removal device (6), sound wave ash removal device (7), downcomer (8), riser (9), boiler barrel (10), this internal over heater (2), evaporimeter I (31), evaporimeter II (32), evaporimeter III (33), economizer (4) of being equipped with in proper order from flue gas inlet flue to exhanst gas outlet flue's boiler, its characterized in that: the heat transfer pipes of the superheater (2), the evaporator I (31), the evaporator II (32), the evaporator III (33) and the economizer (4) adopt novel extended heating surfaces and comprise hollow round pipes, and short fins are arranged on the outer circumferences of the round pipes.

2. The low-resistance cement kiln tail flue gas waste heat recovery boiler of claim 1, characterized in that: the short fins (12) are circular ring bodies extending along the circumferential direction of the hollow circular tube.

3. The low-resistance cement kiln tail flue gas waste heat recovery boiler of claim 2, characterized in that: the short fins (12) are uniformly distributed on the outer circumference of the hollow circular tube along the axial direction.

4. The low resistance cement kiln tail flue gas waste heat recovery boiler of claim 2 or 3, characterized in that: the short fins (12) are arranged on the circumference of the hollow circular tube (11) at equal intervals.

5. The low resistance cement kiln tail flue gas waste heat recovery boiler of claim 4, characterized in that: the short fins (12) and the hollow circular tube (11) are integrally formed.

6. The low-resistance cement kiln tail flue gas waste heat recovery boiler of claim 1, characterized in that: the superheater (2), the evaporator I (31), the evaporator II (32), the evaporator III (33) and the economizer (4) are all of modular independent box structures, double-layer guard plates are arranged outside the box, and a ventilation hanging device is arranged on the upper portion of the box.

7. The low resistance cement kiln tail flue gas waste heat recovery boiler of claim 6, characterized in that: the ventilation hanging device is of a hollow square tube structure, and a square tube is communicated with the outside of the boiler.

8. The low-resistance cement kiln tail flue gas waste heat recovery boiler of claim 1, characterized in that: the rapping dust cleaning device (6) and the sound wave dust cleaning device (7) are respectively arranged on the lower part and the upper part of the superheater (2), the evaporator I (31), the evaporator II (32), the evaporator III (33) and the economizer (4).

9. The low-resistance cement kiln tail flue gas waste heat recovery boiler of claim 1, characterized in that: the heat transfer pipes of the superheater (2), the evaporator I (31), the evaporator II (32), the evaporator III (33) and the economizer (4) are horizontally arranged, and the pipe bundle arrangement adopts an in-line structure.