CN211551664U - Steam and flue gas heat exchange device adopting three-stage heat exchange - Google Patents
Steam and flue gas heat exchange device adopting three-stage heat exchange Download PDFInfo
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- CN211551664U CN211551664U CN201922378031.1U CN201922378031U CN211551664U CN 211551664 U CN211551664 U CN 211551664U CN 201922378031 U CN201922378031 U CN 201922378031U CN 211551664 U CN211551664 U CN 211551664U
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Abstract
The utility model relates to a waste incineration field. The steam flue gas heat exchange device can heat flue gas to a proper temperature, meets the use condition of the flue gas, and fully utilizes the heat of a working medium. The technical scheme is as follows: the utility model provides an adopt steam flue gas heat transfer device of tertiary heat transfer which characterized in that: the device comprises a heat exchanger, a steam-water separation device and a heat exchange pipeline; a primary heat exchange tube box, a secondary heat exchange tube box and a tertiary heat exchange tube box which are arranged along the flowing direction of the flue gas and are sequentially communicated are arranged in the heat exchanger; a flue gas inlet is formed in the first-stage heat exchange tube box, a flue gas outlet is formed in the third-stage heat exchange tube box, and a heat exchange tube is arranged in each heat exchange tube box; the heat exchange pipeline comprises a third-stage high-pressure saturated steam inlet pipe, a third-stage high-pressure saturated water outlet pipe, a second-stage low-pressure superheated steam inlet pipe, a second-stage low-pressure saturated water outlet pipe, a first-stage low-pressure water outlet pipe and a second-stage low-pressure saturated steam outlet pipe.
Description
Technical Field
The utility model relates to a msw incineration field specifically is a steam flue gas heat transfer device who adopts tertiary heat transfer.
Background
At present, with the rapid development of cities, the problem of urban domestic garbage is increasingly serious, and how to realize the harmlessness, reduction and reclamation of the urban domestic garbage becomes a great problem in the world. Among them, incineration of garbage has been widely used in China as a garbage disposal means. Meanwhile, with the increasing importance of society on environmental problems, the emission standard of pollutants generated by waste incineration is more and more strict, and the emission requirement of the smoke containing the pollutants generated by waste incineration can be met only after a series of tail smoke purification treatment processes.
The flue gas generated by the waste incineration contains certain acid gas and nitrogen oxides, in order to meet the ultralow requirements of acid gas emission and Nox emission, more and more technological processes are provided with wet washing deacidification and catalytic denitration processes, and the processes are used as an important part of tail gas treatment equipment. The method has the main effects that the flue gas is heated to a proper temperature through high-pressure saturated steam, namely the temperature of the flue gas is increased to the use temperature of a catalyst or the temperature required by the whitening of the flue gas from the original relatively low temperature, and the heated flue gas enters the next flue gas treatment process flow.
At present, the existing flue gas steam heat exchange device consists of two stages or one stage of heat exchange: the two-stage structure is generally: the first stage is from steam extraction of a steam turbine, the low-pressure superheated steam from the steam turbine is utilized to heat the flue gas from the original temperature of 100-110 ℃ to 140-150 ℃, and at the moment, the low-pressure steam is condensed into low-pressure water; the second stage is from steam extraction of a steam drum, the flue gas of the first stage is further heated to 180-200 ℃ by utilizing the latent heat of condensation of high-pressure saturated steam from the steam drum, and at the moment, the high-pressure saturated steam is condensed into high-pressure saturated water; or only one-level steam drum is used for extracting steam to carry out heat exchange to generate high-pressure saturated water, the heat exchange system of the structure cannot fully utilize the heat of the saturated water to cause heat loss, and meanwhile, in order to heat the flue gas to the required temperature, the required heat exchange area is large, the heat exchange device is large in size, and the economy is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the above-mentioned background art, designing a steam flue gas heat transfer device who adopts tertiary heat transfer, the device can heat the flue gas to suitable temperature, satisfies the service condition of flue gas to utilize the working medium heat fully.
The technical scheme of the utility model is that:
the utility model provides an adopt steam flue gas heat transfer device of tertiary heat transfer which characterized in that: the device comprises a heat exchanger, a steam-water separation device and a heat exchange pipeline;
a primary heat exchange tube box, a secondary heat exchange tube box and a tertiary heat exchange tube box which are arranged along the flowing direction of the flue gas and are sequentially communicated are arranged in the heat exchanger; a flue gas inlet is formed in the first-stage heat exchange tube box, a flue gas outlet is formed in the third-stage heat exchange tube box, and a heat exchange tube is arranged in each heat exchange tube box;
the heat exchange pipeline comprises a three-stage high-pressure saturated steam inlet pipe communicated with an inlet of the three-stage heat exchange pipe, a three-stage high-pressure saturated water outlet pipe with two ends communicated with an outlet of the three-stage heat exchange pipe and an inlet of the steam-water separation device, a two-stage low-pressure superheated steam inlet pipe communicated with an inlet of the second-stage heat exchange pipe, a two-stage low-pressure saturated water outlet pipe with two ends communicated with an outlet of the second-stage heat exchange pipe and an inlet of the first-stage heat exchange pipe, a one-stage low-pressure water outlet pipe communicated with an outlet of the first-stage heat exchange pipe, and a two-stage low-pressure saturated steam outlet pipe with two ends.
The heat exchange tube is a spiral fin tube and comprises a tube body and spiral fins surrounding the outside of the tube body.
And the first-stage low-pressure water outlet pipe is provided with a first valve, a second valve, a third valve and a fourth valve.
The device also comprises a drain pipeline; the drain pipeline comprises a drain pipe communicated with the outlet of the first-stage heat exchange pipe and a drain pool, and a drain valve is arranged on the drain pipe.
The device also comprises a bypass pipeline; the bypass pipeline comprises a bypass pipe connected with the first-stage low-pressure water outlet pipe in parallel and a bypass valve arranged on the bypass pipe, one end of the bypass pipe is communicated with the outlet of the first-stage heat exchange pipe, and the other end of the bypass pipe is communicated with the first-stage low-pressure water outlet pipe between the third valve and the fourth valve.
The utility model has the advantages that:
the utility model discloses a tertiary heat exchanger, but make full use of high pressure saturated steam and low pressure superheated steam's heat, heat exchange efficiency has been improved, heat transfer area has been reduced, make steam flue gas heat transfer device structure compacter, economic benefits is higher, the low temperature flue gas risees to 180 ℃ -230 ℃ by original 100 ℃ -110 ℃ after tertiary heat transfer, the requirement to the temperature is handled to follow-up flue gas has been satisfied, all positions with the flue gas contact in the heat exchanger all adopt the excellent ND steel of corrosion resisting property or carbon steel cladding aluminum alloy preparation, can effectively resist low temperature acid corrosion, increase of service life.
Drawings
Fig. 1 is a schematic view of the connection relationship of the present invention.
Fig. 2 is a schematic view of a heat exchange tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a steam-flue gas heat exchange device using three-stage heat exchange includes a heat exchanger 1, a steam-water separation device 3, a heat exchange pipeline, a drain pipeline and a bypass pipeline.
The heat exchanger is tertiary heat transfer structure, include the one-level heat transfer pipe case 13 that arranges along the flue gas flow direction, second grade heat transfer pipe case 12 and tertiary heat transfer pipe case 11, be equipped with flue gas import 1.2 and one-level heat transfer pipe case and second grade heat transfer pipe case intercommunication on the one-level heat transfer pipe case, be equipped with exhanst gas outlet 1.1 and tertiary heat transfer pipe case and second grade heat transfer pipe case intercommunication on the tertiary heat transfer pipe case, one-level heat transfer pipe incasement portion is equipped with one-level heat exchange tube 62, second grade heat transfer pipe incasement portion is equipped with second grade heat. High-pressure saturated steam is introduced into the third-stage heat exchange tube 22 through the third-stage high-pressure saturated steam introducing tube 21 and the third-stage heat exchange tube inlet 22.1, low-pressure steam extracted by the low-pressure steam turbine is introduced into the second-stage heat exchange tube 52 through the second-stage low-pressure superheated steam introducing tube 51 and the second-stage heat exchange tube inlet 52.1, low-pressure saturated steam led out from the steam-water separation device 3 is introduced into the second-stage heat exchange tube 52 through the second-stage low-pressure saturated steam leading-out tube 41, the second-stage low-pressure superheated steam introducing tube 51 and the second-stage heat exchange tube inlet 52.1, and low-pressure saturated water led out from the steam-water separation device 3 is introduced into the first. By adopting the scheme, the high-pressure steam can be efficiently utilized to fully heat the flue gas, so that the low-temperature flue gas is increased to 180-230 ℃ from the original 100-110 ℃, and the requirement of the subsequent process on the temperature of the flue gas is met.
The heat exchanger is of a metal structure, the box body of each heat exchange tube box and the heat exchange tubes in the box body are made of ND steel or carbon steel coated with aluminum alloy, low-temperature acid corrosion can be effectively prevented, and the service life is prolonged. The heat exchange tube is a spiral fin tube and comprises a tube body 7 and spiral fins 8 surrounding the outside of the tube body; two ends of the pipe body respectively extend out of the heat exchanger and are used for leading in or leading out a heating medium; the number of layers of the fins is determined by the practical engineering situation, the number of layers is generally controlled to be between 20 and 40, and the specification of the tube body is phi 25 to phi 40. The heat exchange tube adopting the scheme can obviously increase the contact area with flue gas and improve the heat exchange efficiency.
In the heat exchange pipeline, a third-stage high-pressure saturated steam inlet pipe 21 is communicated with a third-stage heat exchange pipe inlet 22.1, two ends of a third-stage high-pressure saturated water outlet pipe 23 are respectively communicated with a third-stage heat exchange pipe outlet 22.2 and a steam-water separation device inlet 3.1, a second-stage low-pressure superheated steam inlet pipe 51 is communicated with a second-stage heat exchange pipe inlet 52.1, two ends of a second-stage low-pressure saturated water outlet pipe 53 are respectively communicated with a second-stage heat exchange pipe outlet 52.2 and a first-stage heat exchange pipe inlet 62.1, two ends of a first-stage low-pressure saturated water outlet pipe 61 are respectively communicated with a first steam-water separation device outlet 3.2 and a first-stage heat exchange pipe inlet 62.1, a first-stage low-pressure water outlet pipe 63 is communicated with a first-stage heat exchange pipe outlet 62.2.
The first-stage heat exchange tube box of the heat exchanger utilizes the heat of low-pressure saturated water to heat the temperature of the flue gas to 120-130 ℃, the second-stage heat exchange tube box of the heat exchanger utilizes the condensation latent heat of low-pressure superheated steam from steam extraction of a steam turbine and low-pressure saturated steam from a steam-water separation device to heat the temperature of the flue gas to 150-170 ℃, the third-stage heat exchange tube box of the heat exchanger utilizes the condensation latent heat of high-pressure saturated steam to heat the temperature of the flue gas to 180-230 ℃, and the temperature intervals for heating the flue gas can be designed according to the.
The first-stage low-pressure water outlet pipe is provided with a first valve 631, a second valve 632, a third valve 633 and a fourth valve 634. The type, model and number of the valves are set according to actual engineering requirements, and a stop valve, a regulating valve, a check valve and the like are commonly used in a matching way to control the flow rate and the flow direction of low-pressure water.
The drain pipeline comprises a drain pipe 64 provided with a drain valve 641, and two ends of the drain pipe are respectively communicated with the outlet of the first-stage heat exchange pipe and the drain pool 642. The bypass pipeline comprises a bypass pipe 65 provided with a bypass valve 651, one end of the bypass pipe is communicated with the outlet of the first-stage heat exchange pipe, and the other end of the bypass pipe is communicated with a first-stage low-pressure water outlet pipe between the third valve and the fourth valve.
The drainage pipeline and the bypass pipeline have the functions of drainage, pollution discharge and the like, and can be used for cleaning and maintaining the heat exchanger and in case of pipeline failure.
The utility model discloses in, tertiary heat exchange tube is introduced to high pressure saturated steam (steam pocket extraction), steam-water separator is reintroduced to tertiary heat exchange tube exhaust high pressure saturated water, steam-water separator separates high pressure saturated water into low pressure saturated water and low pressure saturated steam through the flash distillation effect, the second grade heat exchange tube is introduced to low pressure saturated steam, the one-level heat exchange tube is introduced to low pressure saturated water, the one-level heat exchange tube is also introduced to second grade heat exchange tube exhaust low pressure saturated water, consequently make full use of low pressure saturated water and low pressure saturated steam's heat and high pressure saturated water's flash distillation heat, can improve the flue gas temperature by 20-30 degrees, the quantity of total steam has been reduced, and is structural, tertiary heat exchanger series arrangement, compact structure, occupation space is little, economic benefits.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The utility model provides an adopt steam flue gas heat transfer device of tertiary heat transfer which characterized in that: the device comprises a heat exchanger, a steam-water separation device (3) and a heat exchange pipeline;
a primary heat exchange tube box (13), a secondary heat exchange tube box (12) and a tertiary heat exchange tube box (11) which are arranged along the flowing direction of the flue gas and are communicated in sequence are arranged in the heat exchanger; a flue gas inlet (1.2) is formed in the first-stage heat exchange tube box, a flue gas outlet (1.1) is formed in the third-stage heat exchange tube box, and a heat exchange tube is arranged in each heat exchange tube box;
the heat exchange pipeline comprises a three-stage high-pressure saturated steam inlet pipe (21) communicated with an inlet of a three-stage heat exchange pipe (22), a three-stage high-pressure saturated water outlet pipe (23) with two ends communicated with an outlet of the three-stage heat exchange pipe and an inlet of the steam-water separation device, a two-stage low-pressure superheated steam inlet pipe (51) communicated with an inlet of the second-stage heat exchange pipe, a two-stage low-pressure saturated water outlet pipe (53) with two ends communicated with an outlet of the second-stage heat exchange pipe and an inlet of the first-stage heat exchange pipe, a one-stage low-pressure saturated water outlet pipe (61) with two ends communicated with a first outlet of the steam-water separation device and an inlet of the first-stage heat exchange pipe.
2. The steam flue gas heat exchange device adopting three-stage heat exchange according to claim 1, characterized in that: the heat exchange tube is a spiral fin tube and comprises a tube body and spiral fins surrounding the outside of the tube body.
3. The steam flue gas heat exchange device adopting three-stage heat exchange according to claim 2, characterized in that: the primary low-pressure water outlet pipe is provided with a first valve (631), a second valve (632), a third valve (633) and a fourth valve (634).
4. The steam flue gas heat exchange device adopting three-stage heat exchange according to claim 3, characterized in that: the device also comprises a drain pipeline; the drain pipeline comprises a drain pipe (64) communicated with the outlet of the first-stage heat exchange pipe and a drain pool (642), and a drain valve (641) is arranged on the drain pipe.
5. The steam flue gas heat exchange device adopting three-stage heat exchange according to claim 4, characterized in that: the device also comprises a bypass pipeline; the bypass pipeline comprises a bypass pipe (65) connected with the first-stage low-pressure water outlet pipe in parallel and a bypass valve (651) arranged on the bypass pipe, one end of the bypass pipe is communicated with an outlet of the first-stage heat exchange pipe (62), and the other end of the bypass pipe is communicated with the first-stage low-pressure water outlet pipe between the third valve (633) and the fourth valve (634).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922378031.1U CN211551664U (en) | 2019-12-26 | 2019-12-26 | Steam and flue gas heat exchange device adopting three-stage heat exchange |
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| CN201922378031.1U CN211551664U (en) | 2019-12-26 | 2019-12-26 | Steam and flue gas heat exchange device adopting three-stage heat exchange |
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| CN211551664U true CN211551664U (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966618A (en) * | 2019-12-26 | 2020-04-07 | 杭州新世纪能源环保工程股份有限公司 | Steam and flue gas heat exchange device adopting three-stage heat exchange |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966618A (en) * | 2019-12-26 | 2020-04-07 | 杭州新世纪能源环保工程股份有限公司 | Steam and flue gas heat exchange device adopting three-stage heat exchange |
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