CN211041863U - Boiler structure for reducing smoke exhaust temperature of vertical cement kiln tail boiler - Google Patents

Abstract

The utility model discloses a reduce boiler structure of vertical cement kiln tail boiler exhaust gas temperature, including the boiler body, be equipped with the import flue in the boiler body, the over heater, the evaporimeter, the export flue, be equipped with newly-increased economizer in the boiler body between evaporimeter and export flue, newly-increased economizer includes single serpentine pipe, top-down serpentine pipe coils and is the multilayer and arranges, the welding has comb plate on the serpentine pipe of bottom, be connected with spiral fin on the serpentine pipe except comb plate, spiral fin constitutes the heating surface, serpentine pipe one end constitutes newly-increased economizer import collection box in order to get into and wait to add hot water, the serpentine pipe other end constitutes newly-increased economizer export collection box in order to export heating water and/or steam, can be applied to the exhaust-heat boiler that old cement line was equipped with, reduce exhaust gas temperature, improve boiler thermal efficiency and generated energy; the device can also be integrally used for a newly-built cement kiln tail waste heat boiler, the number of heating surface stages is reduced, the steel consumption of the boiler is reduced, the appearance and the occupied area of the boiler are reduced, and the cost is reduced.

Description

Boiler structure for reducing smoke exhaust temperature of vertical cement kiln tail boiler

Technical Field

The utility model relates to a boiler structure, more specifically say a bit, relate to a reduce boiler structure of vertical cement kiln tail boiler exhaust gas temperature, belong to the exhaust-heat boiler field.

Background

The cement kiln tail waste heat boiler is generally arranged behind a kiln tail preheater and used for absorbing heat of waste gas discharged by the preheater and heating water to generate steam to generate power. The discharged flue gas is sent to a raw meal mill for drying raw meal, and the exhaust gas temperature of the boiler is generally designed to be 180-250 ℃ according to the raw meal drying requirement. The cement kiln tail waste heat boiler can be divided into a horizontal type arrangement mode and a vertical type arrangement mode according to the flow direction of flue gas, wherein the boiler arranged in the vertical type mode is small in occupied area and convenient to combine with the cement kiln process flow, a natural circulation water circulation mode is usually adopted for a low-pressure parameter boiler, a circulating pump is not needed, the operation cost is low, and the risk of boiler faults caused by faults of the circulating pump is also avoided.

The kiln tail boiler arranged vertically considers that the dust content of flue gas is large, and the dust has certain adhesiveness although the dust has weak grinding performance, so the key point of the boiler design is how to reduce the influence of dust adhesion on the heat exchange effect, therefore, the conventional method adopts the light pipe structure matched with the mechanical rapping dust removal device, the reasonable flue gas flow rate is ensured in design, the hot surface of the light pipe generates vibration under the hammering action of the rapping device, the deposited dust generates tiny cracks under the repeated action of stress and falls off from the pipe wall, however, the required amount of the hot surface of the light pipe structure is large, the appearance of the boiler is huge, in recent years, people begin to explore the application of the fin pipe structure on a kiln tail waste heat boiler for reducing the cost, the expansion hot surface of the tube is replaced by the expansion hot surface of the fin, so that the steel consumption can be greatly reduced while the heat efficiency is ensured, but the problem of how to effectively clean the ash of the fin tube structure needs to be solved.

Meanwhile, with the improvement of cement technology, the existing cement production line is upgraded, and the exhaust gas temperature required for drying materials is reduced, so that some kiln tail waste heat boilers established in early period are caused to have higher exhaust gas temperature designed according to immature cement process parameters at that time, and heat with utilization value is exhausted into air along with the exhaust gas, so that the kiln tail waste heat boilers are not friendly to the environment, waste of heat is caused, and the existing energy development plan for energy conservation and emission reduction is not met. There is therefore a need for a retrofit and upgrade for such boilers which is simple to implement and efficient.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that exists more than, for further reducing kiln tail exhaust-heat boiler's exhaust gas temperature, provide a boiler structure that reduces vertical cement kiln tail boiler exhaust gas temperature, on the basis of not changing former boiler, through increasing the heat that fin tubular hot side further absorbed the afterbody flue gas in boiler afterbody flue, reach and promote the purpose of generated energy, improvement boiler heat utilization ratio with minimum cost.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

a boiler structure for reducing the exhaust gas temperature of a vertical cement kiln tail boiler comprises a boiler body, wherein an inlet flue, a superheater, an evaporator and an outlet flue are arranged in the boiler body from top to bottom, a newly-added economizer is arranged in the boiler body between the evaporator and the outlet flue and comprises a single coiled pipe, the coiled pipe is horizontally coiled and is arranged in a multilayer mode from top to bottom, a comb-shaped plate is welded on the coiled pipe at the bottom layer, spiral fins are connected to the coiled pipe except the comb-shaped plate and form a heating surface, an inlet header of the newly-added economizer is formed at one end of the coiled pipe to enter water to be heated, and an outlet header of the newly-added economizer is formed at the other end of the coiled pipe to output heating water and/or steam.

As an improvement, the evaporator comprises an upper evaporator and a lower evaporator which are correspondingly arranged up and down.

As an improvement, a plurality of sound wave ash removal devices are arranged between the coiled pipe and the lower evaporator and are distributed on the left side and the right side above the coiled pipe.

As an improvement, a plurality of rings of hanging beams are fixed on the boiler body between the coiled pipe and the lower evaporator, and a plurality of pipe clamps are connected to the hanging beams from top to bottom to lock and fix the coiled pipe.

As an improvement, the sound wave ash cleaning device is a sound wave generator, and the shape of the sound wave generator is R L-M8.

As an improvement, the vibration dust cleaning device comprises a vibration rod mechanism, a vibration hammer mechanism and a motor transmission mechanism, wherein the vibration rod mechanism at least comprises a vibration rod with one end in contact with a comb-shaped plate, the vibration rod penetrates through the wall surface of the heat insulation box body and is provided with a sealing device, the sealing device at least comprises a guide sleeve fixed on the wall surface of the heat insulation box body, the vibration rod penetrates through the guide sleeve, and an oil-immersed asbestos packing is arranged between the guide sleeve and the vibration rod; a pressing sleeve is sleeved on the outer side between the guide sleeve and the rapping rod, and an elastic rapping rod device consisting of a spring sleeve, a spring sleeve and a left spring and a right spring which are sleeved on the rapping rod in an inner mode is arranged on the outer side of the pressing sleeve; the spring sleeve of the elastic vibration rod device is fixedly connected with one end of the guide sleeve; the vibrating hammer mechanism is provided with at least one pin shaft which connects the vibrating hammer and the connecting rod with each other and is fixed by a nut; the nut is formed by inner and outer nuts which are adjacently screwed on the same pin shaft in an inner-outer mode and matched, an outer conical section is arranged on the assembling end face of the inner nut, and a corresponding inner conical section is arranged on the assembling end face of the outer nut.

As an improvement, the outer conical sections on the assembling end faces of the inner nut and the outer nut are provided with a certain amount of eccentricity; the outer nut and the inner nut are both fine threads, the thread top diameter of the outer nut and the inner nut are provided with 30-degree oblique angles, and three-point upsetting anti-falling-off is applied to the outer end face of at least one nut.

As an improvement, at least one flexible sealing sleeve is sleeved outside the elastic vibration rod device.

Has the advantages that: under the condition of not changing the original boiler body structure on a large scale, for a modified structure of the existing vertical light tube cement kiln tail boiler, a heating surface is added in a limited space to serve as a coal economizer, the heating surface adopts a fin tube structure, the expanded heating surface not only can offset the influence of accumulated dust, but also can arrange as many hot surfaces as possible in the limited space, thereby reducing the exhaust gas temperature of the boiler more, achieving the maximization of waste heat utilization and improving the heat utilization efficiency of the boiler; the newly added coal economizer is simultaneously provided with a vibration ash cleaning device and an acoustic wave ash cleaning device, the two ash cleaning modes are both well-established in a cement kiln tail boiler, and the two well-established schemes are combined and applied to the hot surface of the fin tube, so that the ash deposition on the surface of the heating surface of the boiler in the operation process is reduced to the maximum extent, and the optimal ash cleaning effect is achieved to ensure the heat transfer efficiency; simple structure, reasonable arrangement and low modification cost.

Drawings

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

Fig. 2 is a schematic structural view of the rapping rod mechanism of the present invention.

Figure 3 is a perspective view of the interior of the flexible sealing sleeve of the present invention.

Fig. 4 is a schematic view of the rapping hammer mechanism of the present invention.

Fig. 5 is a view of fig. 4A-a.

Fig. 6 is a schematic view of the fitting structure of the inner nut and the outer nut.

Detailed Description

The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.

As shown in figures 1-6, a specific embodiment of a boiler structure for reducing the exhaust gas temperature of a vertical cement kiln tail boiler, the embodiment discloses a boiler structure for reducing the exhaust gas temperature of a vertical cement kiln tail boiler, which comprises a boiler body 4, wherein an inlet flue 5, a superheater 6, an evaporator 7 and an outlet flue 8 are arranged in the boiler body 4 from top to bottom, a newly added coal economizer 9 is arranged in the boiler body 4 between the evaporator 7 and the outlet flue 8, the newly added coal economizer 9 comprises a single serpentine pipe 10, the serpentine tubes 10 are horizontally coiled and arranged in a plurality of layers from top to bottom, comb-shaped plates 15 are welded on the serpentine tubes 10 at the bottom layer, spiral fins are connected on the serpentine tubes 10 except the comb-shaped plates 15, the spiral fins form a heating surface, one end of the coiled pipe 10 forms an inlet header 12 of a newly added economizer to enter water to be heated, the other end of the serpentine pipe 10 forms an outlet header 13 of the new economizer to output heated water and/or steam.

The original vertical kiln tail waste heat boiler is arranged along the smoke direction from top to bottom: import flue 5, over heater 6, evaporimeter 7, economizer, export flue 8, all heating surfaces all adopt the light pipe structure, all hot face below at different levels all are equipped with the ash removal device, the utility model discloses creatively increased newly-increased economizer 9 in boiler export flue 8, newly-increased economizer 9 contains newly-increased economizer export collection box 13, newly-increased economizer import collection box 12, comb plate 15, serpentine 10, spiral fin, and newly-increased economizer 9 hot face all adopts fin tubular structure, has increased the heating area, and the welding has comb plate 15 on the serpentine 10 of bottom, is connected with spiral fin on the serpentine 10 except comb plate 15, utilizes original water supply pipeline, inserts newly-increased economizer import collection box 12, and the feedwater after the heating is drawn forth from newly-increased economizer export collection box 13 and is sent into the boiler barrel. The utility model discloses the transformation that involves former boiler outlet flue, body pipeline, pipeline and heat preservation among the specific implementation process can be handled according to actual conditions, can combine actual conditions, sets up reasonable spiral fin height and fin interval for the accumulation is difficult for the enrichment.

The utility model can be applied to the existing waste heat boiler equipped by the old cement line, further reduces the exhaust gas temperature, improves the boiler thermal efficiency and the generated energy and brings economic benefits to the cement plant by adopting the improved structure; the device can also be integrally used for a newly-built cement kiln tail waste heat boiler, the number of heating surface stages can be greatly reduced, the steel consumption of the boiler is reduced, the appearance and the occupied area of the boiler are reduced, and the cost is reduced.

Taking the transformation of a vertical kiln tail waste heat boiler matched with a 5000t/d cement production line as an example, the original design parameters are 340/340-24.2-1.6/315, and the originally designed exhaust gas temperature is 222 ℃. According to the utility model discloses the structure is reformed transform, and exhaust gas temperature can reduce to 206 ℃, and the boiler increases the emergence volume and promotes 2.8t/h, if steam turbine steam consumption rate according to per kilowatt 5.7kg steam calculation, multiplicable generated energy is about 491kwh, and annual average operating time is according to 7200 hours, and every degree electric income is according to 0.5 yuan, and the annual income after the transformation is about 176.76 ten thousand yuan, and average ton grog generated energy increases about 1.96 kw. Therefore, the power generation efficiency of the boiler is greatly improved by changing the structure, and huge economic benefits are created for cement kiln plants.

As an improved embodiment mode, the evaporator 7 includes an upper evaporator 71 and a lower evaporator 72 which are correspondingly arranged up and down, the utility model discloses creatively increased the economizer 9 in boiler outlet flue 8 to change original economizer into lower evaporator 72, lower evaporator 72 pipeline from the upper evaporator 71 inserts.

As a modified embodiment, a plurality of sonic ash removers 18 are disposed between the serpentine tube 10 and the lower evaporator 72, and the sonic ash removers 18 are distributed on the left and right sides above the serpentine tube 10, so that the substances in the sound field vibrate to make the deposited ash fall off from the tube wall and the fins by using the wave-dynamic characteristics of the sonic.

As an improved embodiment, a plurality of rings of hanging beams 17 are fixed on the boiler body 4 between the serpentine tube 10 and the lower evaporator 72, a plurality of pipe clamps 16 are connected to the hanging beams 17 from top to bottom to lock and fix the serpentine tube 10, and the new coal economizer 9 is hung on the hanging beams 17 through the pipe clamps 16.

As a modified embodiment mode, the sound wave ash cleaning device 18 is a sound wave generator, and the shape of the sound wave generator is R L-M8.

As an improved embodiment mode, the device further comprises a rapping dust-cleaning device, wherein the rapping dust-cleaning device is composed of a rapping rod mechanism 1, a rapping hammer mechanism 2 and a motor transmission mechanism, the rapping rod mechanism 1 at least comprises a rapping rod 11 with one end in contact with a comb-shaped plate 15, the rapping rod 11 penetrates through the wall surface of the heat-insulating box body 121 and is provided with a sealing device 130, the sealing device 130 at least comprises a guide sleeve 131 fixed on the wall surface of the heat-insulating box body 121, the rapping rod 11 penetrates through the guide sleeve 131, and an oil-immersed asbestos packing 132 is arranged between the guide sleeve 131 and the rapping rod 11; a pressing sleeve 133 is sleeved on the outer side between the guide sleeve 131 and the rapping rod 11, and an elastic rapping rod device consisting of a spring sleeve 134 and a left spring 135 and a right spring 136 which are sleeved on the rapping rod 11 in the spring sleeve 134 is arranged on the outer side of the pressing sleeve 133; the spring sleeve 134 of the elastic vibration rod device is fixedly connected with one end of the guide sleeve 131; the rapping hammer mechanism 2 is provided with at least one pin shaft 23 which connects the rapping hammer 21 and the connecting rod 22 with each other and is fixed by a nut; the nut is formed by matching an inner nut 24 and an outer nut 25 which are adjacently screwed on the same pin shaft 23 inside and outside, an outer conical section 241 is arranged on the assembly end surface of the inner nut 24, and a corresponding inner conical section 242 is arranged on the assembly end surface of the outer nut 25;

as shown in fig. 3-6, the rapping rod mechanism 1 includes a rapping rod 11 with one end contacting with the rapping surface, the rapping rod 11 passes through the wall surface of the thermal insulation box 121 and is provided with a sealing device 13, the sealing device 13 includes a guide sleeve 131 fixed on the wall surface of the thermal insulation box 121, the rapping rod 11 passes through the guide sleeve 131, and an oil-immersed asbestos packing 132 is arranged between the guide sleeve 131 and the rapping rod 11, a pressing sleeve 133 is further sleeved outside between the guide sleeve 131 and the rapping rod 11, an elastic rapping rod device composed of a spring sleeve 134, a left spring 135 and a right spring 136 sleeved inside the rapping rod 11 is arranged outside the pressing sleeve 133, the spring sleeve 134 of the elastic rapping rod device is fixedly connected with one end of the guide sleeve 131, the two springs 135 and 136 are both located in the spring sleeve 134, one end of the rapping rod 11 contacts with the vibrated piece 15, and the other end cooperates with the rapping source machine, the left spring 135 and the right spring 136 sleeved on the rapping rod 11 are springs with different elastic coefficients, the left spring 135 and the right spring 136 are made of high-temperature-resistant anti-fatigue materials, the two groups of springs are elaborately calculated to have different elastic coefficients and comprehensively act on the rapping rod 11, the springs can ensure that the rapping rod 11 can be reset in time after one rapping is completed, the left end of each spring is in close contact with a heated surface to facilitate the transmission of vibration energy, and the peak value of each spring is well reduced under the action of the left spring 135 and the right spring 136 under huge instant impact stress, so that the heated surface can be ensured not to be damaged by large impact stress, and the springs have enough anti-fatigue strength, thereby being capable of continuously and stably working, the right end of the rapping rod 11 is close to the rapping hammer 21, and the rapping hammer 21 frequently impacts the rapping rod 11 to enable the rapping rod 11 to rap the comb plate 15. Meanwhile, the sealing device 130 of the rapping rod 11 gives a certain resistance, which ensures that the elastic rapping rod can be stabilized quickly after the last rapping and is ready for the next rapping transmission. The rapping hammer mechanism 2 according to the present invention mainly has a pin 23 interconnecting the rapping hammer 21 and the connecting rod 22 and is fixed by nuts 24, 25. When the vibrating beater works, the vibrating beater 21 impacts frequently to vibrate and can rotate freely around the axis.

A rapping dust-cleaning device is arranged below the newly-added economizer 9, the rapping dust-cleaning device works continuously, a rapping rod 11 in the rapping dust-cleaning device is indirectly connected with the serpentine tube 10 and the spiral fins through a comb-shaped plate 15, and the rapping rod vibrates under the continuous hammering of a vibration hammer 21, so that accumulated dust generates tiny cracks under the stress of repeated action and falls off from the serpentine tube 10 and the spiral fins.

As a modified embodiment, the outer conical sections on the assembling end surfaces of the inner and outer nuts 24, 25 are provided with a certain amount of eccentricity; the outer nut 25 and the inner nut 24 both adopt fine threads, the thread top diameter of the outer nut is provided with a 30-degree oblique angle, and the outer end surface of at least one nut is applied with three points to prevent upsetting and falling off;

the nuts 24 and 25 are formed by matching an inner nut and an outer nut which are adjacently screwed on the same pin shaft 23 inside and outside, an outer conical section 241 is arranged on the assembly end surface of the inner nut 24, a corresponding inner conical section 242 is arranged on the assembly end surface of the outer nut 25, and a certain amount of eccentricity is arranged on the outer conical section 241 on the assembly end surface of the inner nut 24; the inner conical section 242 of the outer nut 25 is not eccentric, so that the inner conical section and the outer conical section can be matched and locked with each other, a thread pair can generate large top diameter interference, small inner and outer conical surface matching is added, a good anti-loosening effect can be obtained, the outer nut and the inner nut are both provided with novel fine thread, the thread top diameter of the outer nut is provided with a 30-degree oblique angle, three-point top heading anti-falling is applied to the outer end surface of at least one nut, the vibration anti-loosening performance of the outer nut is better, the thread connection does not need to compress the vibration hammer, the vibration hammer is self-locked and locked by means of thread connection, and the movement of the.

As a modified embodiment mode, at least one flexible sealing sleeve 14 is sleeved outside the elastic vibration rod device, and the sealing sleeve 14 can be made of high-temperature-resistant glass fiber and polytetrafluoroethylene cloth and can also be replaced by other similar high-temperature-resistant materials.

Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.

Claims (8)

1. The utility model provides a reduce boiler structure of vertical cement kiln tail boiler exhaust gas temperature, includes boiler body (4), and top-down is in be equipped with inlet flue (5), over heater (6), evaporimeter (7), export flue (8) in boiler body (4), its characterized in that: the boiler is characterized in that a newly-added economizer (9) is arranged in a boiler body (4) between an evaporator (7) and an outlet flue (8), the newly-added economizer (9) comprises a single coiled pipe (10), the coiled pipe (10) is horizontally coiled and is arranged in a multi-layer mode from top to bottom, a comb plate (15) is welded on the coiled pipe (10) at the bottom layer, spiral fins are connected to the coiled pipe (10) except the comb plate (15) and form a heating surface, one end opening of the coiled pipe (10) forms a newly-added economizer inlet header (12) to enter water to be heated, and the other end opening of the coiled pipe (10) forms a newly-added economizer outlet header (13) to output heating water and/or steam.

2. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 1, wherein: the evaporator (7) comprises an upper evaporator (71) and a lower evaporator (72) which are correspondingly arranged up and down.

3. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 2, characterized in that: a plurality of sound wave ash cleaning devices (18) are arranged between the coiled pipe (10) and the lower evaporator (72), and the sound wave ash cleaning devices (18) are distributed on the left side and the right side above the coiled pipe (10) and are fixed in the boiler body (4).

4. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 2 or 3, wherein: a plurality of rings of hanging beams (17) are fixed on the boiler body (4) between the coiled pipe (10) and the lower evaporator (72), and a plurality of pipe clamps (16) are connected to the hanging beams (17) from top to bottom to lock and fix the coiled pipe (10).

5. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler according to the claim 3, characterized in that the sound wave ash removal device (18) is a sound wave generator, and the sound wave generator is R L-M8 in model.

6. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 1, wherein: the vibration and beating type dust cleaning device is characterized by further comprising a vibration and beating device, wherein the vibration and beating device is composed of a vibration and beating rod mechanism (1), a vibration and beating hammer mechanism (2) and a motor transmission mechanism, the vibration and beating rod mechanism (1) at least comprises a vibration and beating rod (11) with one end in contact with a comb-shaped plate (15), the vibration and beating rod (11) penetrates through the wall surface of the heat insulation box body (121) and is provided with a sealing device (130), the sealing device (130) at least comprises a guide sleeve (131) fixed on the wall surface of the heat insulation box body (121), the vibration and beating rod (11) penetrates through the guide sleeve (131), and an oil-immersed asbestos packing (132) is arranged between the guide sleeve (131) and the vibration; a pressing sleeve (133) is sleeved on the outer side between the guide sleeve (131) and the rapping rod (11), and an elastic rapping rod device consisting of a spring sleeve (134) and left and right springs (135, 136) arranged on the rapping rod (11) and sleeved in the spring sleeve (134) is arranged on the outer side of the pressing sleeve (133); a spring sleeve (134) of the elastic vibration rod device is fixedly connected with one end of a guide sleeve (131); the rapping hammer mechanism (2) is provided with at least one pin shaft (23) which connects the rapping hammer (21) and the connecting rod (22) with each other and is fixed by a nut; the nut is formed by matching an inner nut (24) and an outer nut (25) which are screwed on the same pin shaft (23) in an inner-outer adjacent mode, an outer conical section (241) is arranged on the assembling end face of the inner nut (24), and a corresponding inner conical section (242) is arranged on the assembling end face of the outer nut (25).

7. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 6, wherein: the outer conical sections on the assembling end surfaces of the inner nut (24) and the outer nut (25) are provided with a certain amount of eccentricity; the outer nut (25) and the inner nut (24) both adopt fine-thread threads, the thread top diameter of the outer nut is provided with a 30-degree oblique angle, and the outer end surface of at least one nut is applied with three-point heading anti-falling.

8. The boiler structure for reducing the exhaust gas temperature of the vertical cement kiln tail boiler as claimed in claim 7, wherein: at least one flexible sealing sleeve (14) is sleeved outside the elastic vibration rod device.

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