CN217482793U - Flue gas cooler, pneumatic ash conveying system and flue gas cooling system - Google Patents

Abstract

The utility model relates to a flue gas cooler, defeated grey system of strength and flue gas cooling system, this flue gas cooler includes the shell body, the first end of shell body is provided with the inlet flue that is used for with the exhanst gas outlet intercommunication of air preheater, the second end relative with first end is provided with the outlet flue that is used for with the flue gas import intercommunication of dust remover, the inside of shell body is provided with a plurality of flue gas cooling modules along the flow direction interval of flue gas, form the row's ash cavity between every two adjacent flue gas cooling modules, the bottom of every row's ash cavity all is provided with the row's ash mouth that is used for with defeated grey system of strength intercommunication, thereby can solve the inside easy deposition of flue gas cooler among the correlation technique or block up and lead to cooler heat exchange efficiency and the lower problem of generating set operational reliability, and have can stable work, pollutant emission concentration is low and advantage with low costs.

Description

Flue gas cooler, pneumatic ash conveying system and flue gas cooling system

Technical Field

The utility model relates to an ultralow emission boiler overhauls technical field, specifically relates to a flue gas cooler, defeated grey system of strength and flue gas cooling system.

Background

The coal-fired turbo generator set of thermal power factory has set up the gas cooler at electrostatic precipitator entry flue when carrying out "ultralow emission" and transforming, among the correlation technique, the smoke and dust problem of piling up easily appears between the cavity of gas cooler's the multistage module to lead to gas cooler deposition, jam, the system resistance increase, heat exchange efficiency reduces, influences electrostatic precipitator's dust collection efficiency and unit area high load, brings great influence for ultralow emission and safe economic operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a flue gas cooler, defeated grey system of strength and flue gas cooling system, this flue gas cooler can solve among the relevant art flue gas cooler inside easy deposition of ash or jam thereby lead to cooler heat exchange efficiency and generating set operational reliability lower problem.

In order to realize the above object, the first aspect of the present disclosure provides a flue gas cooler, which comprises an outer shell, the first end of the outer shell is provided with a smoke inlet for communicating with a flue gas outlet of an air preheater, and the second end opposite to the first end is provided with a smoke outlet for communicating with a flue gas inlet of a dust remover, the inside of the outer shell is provided with a plurality of flue gas cooling modules at intervals along the flowing direction of flue gas, every two adjacent flue gas cooling modules form an ash discharge chamber between the flue gas cooling modules, and every ash discharge chamber's bottom all is provided with an ash discharge port for communicating with a pneumatic ash conveying system.

Optionally, the number of the flue gas cooling modules is three and arranged at equal intervals inside the outer casing.

Optionally, the three flue gas cooling module includes along the flow direction of flue gas interval arrangement's first order flue gas cooling module, second level flue gas cooling module and third level flue gas cooling module in proper order, second level flue gas cooling module with third level flue gas cooling module is in following the width in the flow direction of flue gas all is less than first level flue gas cooling module is in following the width in the flow direction of flue gas.

Optionally, the second stage flue gas cooling module and the third stage flue gas cooling module have the same width in the flow direction of the flue gas.

Optionally, the ash discharge port is arranged at the bottom of the ash discharge chamber in a funnel shape.

The second aspect of the present disclosure further provides a pneumatic ash conveying system, which includes an ash storage, an ash conveying pipeline and the flue gas cooler as described above, wherein the ash storage is respectively communicated with a plurality of ash discharge ports of the flue gas cooler through the ash conveying pipeline.

Optionally, the pneumatic ash conveying system further comprises a bin pump and a compressed air supply device, the ash conveying pipeline comprises a first pipeline and a second pipeline, an ash inlet of the bin pump passes through the first pipeline respectively with a plurality of ash discharge ports of the flue gas cooler are communicated and are provided with a first control valve on the first pipeline, an ash outlet of the bin pump passes through the second pipeline with an ash inlet of the ash bin communicated and is provided with a second control valve on the second pipeline, an air inlet of the bin pump passes through a first air conveying pipeline and an air outlet of the compressed air supply device communicated and is provided with a third control valve on the first air conveying pipeline.

Optionally, an auxiliary air inlet and an auxiliary air outlet are further arranged on the bin pump, the auxiliary air inlet is communicated with the air outlet of the compressed air supply device through a second air transmission pipeline, a fourth control valve is further arranged on the second air transmission pipeline, and a fifth control valve is further arranged on the auxiliary air outlet.

The third aspect of the present disclosure further provides a flue gas cooling system, which includes an air preheater, a dust remover, a flue gas cooler, a condensed water supply system, and the pneumatic ash conveying system, wherein a smoke inlet of the flue gas cooler is communicated with a flue gas outlet of the air preheater, a smoke outlet of the flue gas cooler is communicated with a flue gas inlet of the dust remover, an air outlet of the flue gas cooler is communicated with an air inlet of the air preheater, a plurality of flue gas cooling modules in the flue gas cooler include a first stage flue gas cooling module, a second stage flue gas cooling module, and a third stage flue gas cooling module, which are sequentially arranged along a flow direction of flue gas at intervals, a water supply port and a first water outlet of the first stage flue gas cooling module are both communicated with the condensed water supply system, a second water outlet of the first stage flue gas cooling module is communicated with a first water inlet of the second stage flue gas cooling module through a first communication pipe, the water outlet of the second-stage flue gas cooling module is communicated with the water inlet of the air heater, the water outlet of the air heater is communicated with the water inlet of the third-stage flue gas cooling module, and the water outlet of the third-stage flue gas cooling module is communicated with the second water inlet of the second-stage flue gas cooling module through a second communicating pipe.

Optionally, the condensate water supply system includes a condensate water conveying flow path and No. 8 low-pressure heater, No. 7 low-pressure heater, No. 6 low-pressure heater and No. 5 low-pressure heater connected in series in sequence along the flow direction of the condensate water in the condensate water conveying flow path, the water supply port of the first stage flue gas cooling module is communicated with the water outlet of the No. 6 low-pressure heater and the water outlet of the No. 7 low-pressure heater through a first flow path respectively, and the first water outlet of the first stage flue gas cooling module is communicated with the water inlet of the No. 5 low-pressure heater through a second flow path.

Through the technical scheme, namely the flue gas cooler provided by the disclosure, the flue gas cooler is provided with the plurality of flue gas cooling modules at intervals in the outer shell along the flowing direction of the flue gas, so that the flue gas discharged from the flue gas outlet of the air preheater can be discharged into the outer shell through the flue gas inlet to be cooled, the flue gas sequentially flows through the plurality of flue gas cooling modules in the outer shell to be cooled and then is discharged into the dust remover from the flue gas outlet of the outer shell through the flue gas inlet of the dust remover, and thus, the flue gas is cooled by the flue gas cooler, so that the coal consumption of a thermal power generation boiler can be reduced, the dust removal efficiency of the dust remover can be improved, the dust concentration of the flue gas outlet of the dust remover can be reduced, and the ultralow emission can be realized. In addition, the bottom of the ash discharge chamber formed between two adjacent flue gas cooling modules in the plurality of flue gas cooling modules is provided with an ash discharge port communicated with the pneumatic ash conveying system, so that smoke dust or accumulated ash and the like in the outer shell can be discharged to the outside of the outer shell through the ash discharge port through the pneumatic ash conveying system, the heat exchange effect of the flue gas cooler can be enhanced, the system resistance is reduced, the reliability of the operation of the generator set is enhanced, and the ultralow emission and the safe and economical operation of the generator set can be realized. Therefore, the flue gas cooler that this disclosure provided can solve among the correlation technique thereby the inside easy deposition of flue gas cooler or block up and lead to cooler heat exchange efficiency and the lower problem of generating set operational reliability, and have can stable operation, pollutant emission concentration is low and advantage with low costs.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

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

FIG. 1 is a schematic structural view of a flue gas cooler provided in exemplary embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a pneumatic ash transport system provided in an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic block diagram of a flue gas cooling system provided in exemplary embodiments of the present disclosure.

Description of the reference numerals

1-an outer shell; 110-a smoke inlet; 120-a smoke outlet; 130-a flue gas cooling module; 131-a first stage flue gas cooling module; 132-second stage flue gas cooling module; 133-third stage flue gas cooling module; 140-ash discharge chamber; 141-ash discharge port; 2-an air preheater; 3-a dust remover; 4-ash storehouse; 5-ash conveying pipeline; 510-a first conduit; 520-a second conduit; 6-bin pump; 7-compressed gas supply means; 8-a first control valve; 9-a second control valve; 10-a first gas transmission pipeline; 11-a third control valve; 12-an auxiliary air inlet; 13-auxiliary exhaust port; 14-a second gas transmission pipeline; 15-a fourth control valve; 16-a fifth control valve; 17-a warm air blower; 18-a first communication pipe; 19-a second communicating tube; 20-a condensate delivery flow path; no. 21-8 low pressure heater; no. 22-7 low pressure heater; no. 23-6 low pressure heater; 24-5 low pressure heater; 25-first flow path; 26-a second flow path; 27-a circulation flow path; 28-outside cold air; 29-an economizer; 30-induced draft fan; 31-a desulfurizing tower; 32-a chimney; 33-stop valve.

Detailed Description

The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, "inner and outer" refer to inner and outer relative to the contour of the component or structure itself. In addition, it should be noted that terms such as "first", "second", and the like are used for distinguishing one element from another, and have no order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

The inventor researches and discovers that dust is deposited at the bottom of a cavity between two adjacent flue gas cooling modules of a flue gas cooler in a thermal power generator set, and the flow speed of flue gas is reduced after the flue gas passes through the previous flue gas cooling module, so that the smoke dust is precipitated in the cavity between the two flue gas cooling modules, and the accumulation can reach more than 1 meter; in addition, scaling and blockage are caused among flue gas cooler modules and among fins of the flue gas cooler, and the other reason is that flue gas contains ammonia gas after SCR denitration modification, the ammonia gas is condensed on the surface of an object below 70 ℃, and the surface temperature of the flue gas cooling module is often lower than 70 ℃ during low load.

Based on this, according to a first aspect of the present disclosure, there is provided a flue gas cooler, as shown in fig. 1 to 3, the flue gas cooler includes an outer shell 1, a first end of the outer shell 1 is provided with a flue gas inlet 110 for communicating with a flue gas outlet of an air preheater 2, a second end opposite to the first end is provided with a flue gas outlet 120 for communicating with a flue gas inlet of a dust remover 3, the inside of the outer shell 1 is provided with a plurality of flue gas cooling modules 130 at intervals along a flow direction of flue gas, an ash discharge chamber 140 is formed between every two adjacent flue gas cooling modules 130, and the bottom of each ash discharge chamber 140 is provided with an ash discharge port 141 for communicating with a pneumatic ash conveying system.

Through the technical scheme, namely the flue gas cooler provided by the disclosure, the flue gas cooler is provided with the plurality of flue gas cooling modules 130 at intervals in the outer shell 1 along the flowing direction of the flue gas, so that the flue gas discharged from the flue gas outlet of the air preheater 2 can be discharged into the outer shell 1 through the flue gas inlet 110 for cooling, the flue gas sequentially flows through the plurality of flue gas cooling modules 130 in the outer shell 1 for cooling, and then is discharged into the dust remover 3 from the flue gas outlet 120 of the outer shell 1 through the flue gas inlet of the dust remover 3, so that the flue gas is cooled by the flue gas cooler, the coal consumption of a thermal power generation boiler can be reduced, the improvement of the dust removal efficiency of the dust remover 3 is facilitated, the dust concentration of the flue gas outlet of the dust remover 3 is reduced, and ultra-low emission is realized. In addition, the bottom of the ash discharge chamber 140 formed between two adjacent flue gas cooling modules 130 in the plurality of flue gas cooling modules 130 is provided with an ash discharge port 141 communicated with the pneumatic ash conveying system, so that smoke dust or accumulated ash in the outer shell 1 can be discharged to the outside of the outer shell 1 through the ash discharge port 141 through the pneumatic ash conveying system, the heat exchange effect of the flue gas cooler is enhanced, the system resistance is reduced, the reliability of the running of the generator set is enhanced, and the ultralow emission and the safe and economical running of the generator set can be realized. Therefore, the flue gas cooler that this disclosure provided can solve among the correlation technique the inside easy deposition of flue gas cooler or block up thereby lead to cooler heat exchange efficiency and the lower problem of generating set operational reliability, and have can stable operation, pollutant emission concentration is low and advantage with low costs.

It should be noted here that fig. 1 exemplarily shows the flow direction of the flue gas, and the arrow points to, i.e., is the flow direction of the flue gas.

In some embodiments, referring to fig. 1, the number of the flue gas cooling modules 130 may be three and arranged in the inside of the outer casing 1 at equal intervals, so that the flue gas with reduced flow rate after passing through the first flue gas cooling module 130, such as smoke dust, is accumulated in the ash discharge chamber 140 and is discharged to the outside of the outer casing 1 through the ash discharge port 141 of the ash discharge chamber 140, further, the flue gas with first dust fall flows through the second flue gas cooling module 130 again, so that the flow rate of the flue gas is further reduced, and since the three flue gas cooling modules 130 are arranged at equal intervals, the flow distance of the flue gas in each ash discharge chamber 140 is ensured to be consistent, so as to facilitate the secondary dust fall of the flue gas in the ash discharge chamber 140, and ensure the ultralow emission of the generator set.

In addition, in some embodiments, referring to fig. 1, the three flue gas cooling modules 130 may include a first stage flue gas cooling module 131, a second stage flue gas cooling module 132, and a third stage flue gas cooling module 133 that are sequentially arranged at intervals along the flow direction of the flue gas, and the width a of the second stage flue gas cooling module 132 and the width a of the third stage flue gas cooling module 133 along the flow direction of the flue gas are both smaller than the width b of the first stage flue gas cooling module 131 along the flow direction of the flue gas, so as to facilitate shortening the flow distance of the flue gas with reduced flow velocity after passing through the first stage flue gas cooling module 131 in the second stage flue gas cooling module 132 and the third stage flue gas cooling module 133, thereby reducing, for example, scaling and blocking of ammonia in the flue gas between fins, and further affecting stable operation of the generator set, and simultaneously shortening the width a of the second stage flue gas cooling module 132 and the third stage flue gas cooling module 133 along the flow direction of the flue gas also facilitates on-site cleaning or maintenance And (6) industry.

In some embodiments, as shown in fig. 1 and 2, the widths of the second stage flue gas cooling module 132 and the third stage flue gas cooling module 133 in the flow direction of the flue gas may be equal, specifically, the second stage flue gas cooling module 132 may have a size of 6.7 mx 0.95 mx 3.8m (i.e., c · a · d), the third stage flue gas cooling module 133 may have a size of 6.7 mx 0.95 mx 3.8m (i.e., c · a · d), and the first stage flue gas cooling module 131 may have a size of 6.7 mx 1.9 mx 3.8m (i.e., c · b · d).

The ash discharge port 141 may be configured in any suitable manner according to the actual application requirements, for example, in some embodiments, as shown in fig. 1 and 2, the ash discharge port 141 may be funneled at the bottom of the ash discharge chamber 140 so as to discharge the smoke in the flue gas to the outside of the outer casing 1 through the ash discharge port 141.

According to the second aspect of the present disclosure, a pneumatic ash conveying system is further provided, as shown in fig. 1 to fig. 3, the pneumatic ash conveying system includes an ash storage 4, an ash conveying pipeline 5 and the above flue gas cooler, the ash storage 4 is respectively communicated with the plurality of ash discharge ports 141 of the flue gas cooler through the ash conveying pipeline 5, so as to solve the problem that the heat exchange efficiency of the cooler and the operation reliability of the generator set are low due to easy ash deposition or blockage inside the flue gas cooler in the related art, and have all the beneficial effects of the above flue gas cooler, which is not described herein again.

In some embodiments, referring to fig. 1 and 2, the pneumatic ash conveying system may further include a bin pump 6 and a compressed gas supply device 7, the ash conveying pipe 5 includes a first pipe 510 and a second pipe 520, an ash inlet of the bin pump 6 is respectively communicated with the plurality of ash discharge ports 141 of the flue gas cooler through the first pipe 510, a first control valve 8 is disposed on the first pipe 510, an ash outlet of the bin pump 6 is communicated with an ash inlet of the ash storage 4 through the second pipe 520, a second control valve 9 is disposed on the second pipe 520, an air inlet of the bin pump 6 is communicated with an exhaust port of the compressed gas supply device 7 through the first gas conveying pipe 10, and a third control valve 11 is disposed on the first gas conveying pipe 10, therefore, for example, the smoke or the accumulated dust discharged from the dust discharge port 141 can be more rapidly discharged from the dust conveying pipe 5 into the dust storage 4 through the compressed air supply device 7 and the bin pump 6, and the working efficiency is improved. In the concrete work, when an operator carries out the ash cleaning operation of the flue gas cooler, firstly, the smoke inlet 110 and the smoke outlet 120 of the flue gas cooler are operatively closed, then the first control valve 8 is opened, the smoke dust or the accumulated ash in the ash discharging chamber 140 is sent into the bin pump 6 through the first pipeline 510 through the ash discharging port 141, when the bin pump 6 is full, the first control valve 8 is closed, then the third control valve 11 is opened, the compressed gas in the compressed gas supply device 7 is sent into the bin pump 6 through the first gas pipeline 10, after the gas pressure in the bin pump 6 reaches a certain degree, the second control valve 9 is opened, so that the smoke dust or the accumulated ash in the bin pump 6 is more efficiently discharged into the ash bin 4 through the second pipeline 520, when all the smoke dust or the accumulated ash in the bin pump 6 is discharged into the ash bin 4, the second control valve 9 and the third control valve 11 are closed, and the above steps are repeated, until the smoke dust or the accumulated dust in the flue gas cooler is cleaned, the operation and the control are good and the efficiency is high. The compressed air supply device 7 may be configured to include an air tank storing compressed air therein and an air pump disposed at an air outlet of the air tank to enable supply of the compressed air into the bin pump 6, or the compressed air supply device 7 may be an air compressor, and the disclosure is not limited thereto.

In addition, in some embodiments, referring to fig. 2, an auxiliary air inlet 12 and an auxiliary air outlet 13 may be further disposed on the bin pump 6, the auxiliary air inlet 12 is communicated with the air outlet of the compressed air supply device 7 through a second air transmission pipeline 14, a fourth control valve 15 is further disposed on the second air transmission pipeline 14, and a fifth control valve 16 is further disposed on the auxiliary air outlet 13, so that auxiliary air can be supplied through the auxiliary air inlet 12 when the bin pump 6 discharges ash into the ash bin 4, and the ash bin 5 is prevented from being blocked due to too low pressure of the compressed air during ash transportation. And through being provided with supplementary gas vent 13, can be with the remaining gas outgoing in the storehouse pump 6 to do benefit to in smoke and dust or deposition in the gas cooler arrange the storehouse pump 6 through arranging grey mouth 141, the nature controlled is good and efficient. The first control valve 8, the second control valve 9, the third control valve 11, the fourth control valve 15, and the fifth control valve 16 may be electric valves or manual valves, which is not limited in this disclosure.

Based on the above embodiments, the present disclosure exemplarily describes the working process of the pneumatic ash conveying system, as shown in fig. 1 and fig. 2, specifically as follows: before the pneumatic ash conveying system is started, the first control valve 8, the second control valve 9, the third control valve 11, the fourth control valve 15 and the fifth control valve 16 are all in a closed state, before ash cleaning operation of the flue gas cooler is carried out, an operator can operatively open the fifth control valve 16, firstly, residual gas in the bin pump 6 is discharged through the auxiliary exhaust port 13, after the residual gas in the bin pump 6 is discharged, the fifth control valve 16 is closed, then, the smoke inlet 110 and the smoke outlet 120 of the flue gas cooler are closed, then, the first control valve 8 is opened, smoke dust or accumulated ash in the ash discharge chamber 140 is discharged from the ash discharge port 141-the first pipeline 510-the ash inlet of the first control valve 8-the bin pump 6 under the guidance of air pressure, so that the smoke dust or the accumulated ash in the ash discharge chamber 140 is discharged into the bin pump 6, when the bin pump 6 is full, the first control valve 8 is closed, then, the third control valve 11 is opened, the compressed air in the compressed air supply device 7 is sent into the bin pump 6 through the first air transmission pipeline 10, after the air pressure in the bin pump 6 reaches a certain degree, the second control valve 9 is opened, meanwhile, the fourth control valve 15 is opened, the smoke dust or the deposited dust in the bin pump 6 is guided by the air pressure to be discharged into the dust storage 4 from the dust outlet of the bin pump 6, the second pipeline 520, the second control valve 9 and the dust inlet of the dust storage 4, the smoke dust or the deposited dust in the bin pump 6 is discharged into the dust storage 4, after the smoke dust or the deposited dust in the bin pump 6 is discharged, the second control valve 9 and the fourth control valve 15 are finally closed, and the operation process is repeated until the smoke dust or the deposited dust in the flue gas cooler is completely removed.

According to a third aspect of the present disclosure, there is further provided a flue gas cooling system, as shown in fig. 3, the flue gas cooling system includes an air preheater 2, a dust remover 3, an air heater 17, a condensed water supply system, and the above pneumatic ash conveying system, a flue gas inlet 110 of the flue gas cooler is communicated with a flue gas outlet of the air preheater 2, a flue gas outlet 120 is communicated with a flue gas inlet of the dust remover 3, an air outlet of the air heater 17 is communicated with an air inlet of the air preheater 2, a plurality of flue gas cooling modules 130 in the flue gas cooler include a first stage flue gas cooling module 131, a second stage flue gas cooling module 132, and a third stage flue gas cooling module 133, which are sequentially arranged at intervals along a flow direction of flue gas, a water supply port and a first water outlet of the first stage flue gas cooling module 131 are both communicated with the condensed water supply system, a second water outlet of the first stage flue gas cooling module 131 is communicated with a first water inlet of the second stage flue gas cooling module 132 through a first communication pipe 18, the water outlet of the second-stage flue gas cooling module 132 is communicated with the water inlet of the air heater 17, the water outlet of the air heater 17 is communicated with the water inlet of the third-stage flue gas cooling module 133, and the water outlet of the third-stage flue gas cooling module 133 is communicated with the second water inlet of the second-stage flue gas cooling module 132 through a second communicating pipe 19, so that a circulating flow path 27 for circulating and flowing condensed water is formed among the air heater 17, the second-stage flue gas cooling module 132 and the third-stage flue gas cooling module 133. The smoke cooling system can solve the problem that the heat exchange efficiency of the cooler and the running reliability of the generator set are lower due to the fact that dust is easily accumulated or blocked inside the smoke cooler in the related technology, has all the beneficial effects of the pneumatic dust conveying system, and is not repeated in the disclosure.

In addition, in some embodiments, referring to fig. 3, the air inlet of the air heater 17 may be communicated with the external cold air 28, the flue gas inlet of the air preheater 2 is communicated with the economizer 29, and the air outlet of the air preheater 2 is communicated with the air inlet of the economizer 29, so that the condensed water in the condensed water supply system is supplied to the flue gas cooler and exchanges heat with the high-temperature flue gas discharged from the air preheater 2 in the flue gas cooler, and then the condensed water after heat exchange is conveyed to the air heater 17 through the circulation flow path 27, so as to heat the external cold air 28 in the air heater 17, and further the heated external cold air 28 enters the air heater 2 through the air outlet of the air heater 17 through the air inlet of the air preheater 2, so as to prevent the air preheater 2 from low-temperature corrosion. In addition, the flue gas outlet of the dust remover 3 is communicated with the flue gas inlet of the chimney 32 through the induced draft fan 30 and the desulfurizing tower 31 in sequence, so that the flue gas after heat exchange of the flue gas cooler is discharged after sequentially flowing through the dust remover 3, the induced draft fan 30, the desulfurizing tower 31 and the chimney 32 under the guide of the induced draft fan 30, the emission of dust concentration is effectively reduced, further ultralow emission is realized, and the environmental pollution is low. The circulation flow path 27 may be provided with a circulation pump (not shown) to drive the condensed water to circulate, which is highly efficient. In addition, fig. 3 exemplarily shows the flow directions of the gas (i.e., the flue gas and the outside cold air 28) and the condensed water, and the solid line arrows indicate, i.e., the flow direction of the gas, and the dotted line arrows indicate, i.e., the flow direction of the condensed water.

In some embodiments, referring to fig. 3, the condensate supply system may include a condensate conveying flow path 20, and a No. 8 low-pressure heater 21, a No. 7 low-pressure heater 22, a No. 6 low-pressure heater 23, and a No. 5 low-pressure heater 24 sequentially connected in series along a flow direction of condensate in the condensate conveying flow path 20, a water supply port of the first stage flue gas cooling module 131 is respectively communicated with a water outlet of the No. 6 low-pressure heater 23 and a water outlet of the No. 7 low-pressure heater 22 through a first flow path 25, and a first water outlet of the first stage flue gas cooling module 131 is communicated with a water inlet of the No. 5 low-pressure heater 24 through a second flow path 26. The condensed water delivery flow path 20, the first flow path 25 and the second flow path 26 may further be provided with, for example, a stop valve 33, so that the opening or closing of the condensed water delivery flow path 20, the first flow path 25 and the second flow path 26 is realized by opening or closing the stop valve 33, and the device has good operability and is convenient for later-stage maintenance work.

Based on the above embodiments, the present disclosure exemplarily describes an operation process of the condensed water supply system, which is described with reference to fig. 1 and 3, specifically as follows: part of the condensed water sequentially flows through a No. 8 low-pressure heater 21, a No. 7 low-pressure heater 22, a No. 6 low-pressure heater 23 and a No. 5 low-pressure heater 24 through a condensed water conveying flow path 20, meanwhile, steam which does part of work in the steam turbine unit enters the low-pressure heaters to exchange heat with the condensed water flowing through the interior of the low-pressure heaters so as to heat the condensed water, so that the steam extraction of the steam turbine can be reduced, the work of the steam turbine can be increased, and the coal consumption of a thermal power generation boiler can be reduced; after the other part of the condensed water is mixed from the water outlet of the No. 7 low-pressure heater 22 and the water outlet of the No. 6 low-pressure heater 23 through the first flow path 25 and enters the flue gas cooler from the water supply port of the first stage flue gas cooling module 131 to perform heat exchange with the high-temperature flue gas, a part of the condensed water flows from the first water outlet of the first stage flue gas cooling module 131 to the No. 5 low-pressure heater 24 through the second flow path 26, and a part of the condensed water flows from the second water outlet of the first stage flue gas cooling module 131 to the second stage flue gas cooling module 132 through the first communication pipe 18 and then flows from the water outlet of the second stage flue gas cooling module 132 to the air heater 17 through the circulation flow path 27, so that the condensed water is used for heating the external cold air 28 in the air heater 17, and the air preheater 2 can be prevented from being corroded at a low temperature.

The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. The utility model provides a flue gas cooler, its characterized in that, includes the shell body, the first end of shell body is provided with the inlet flue that is used for with the exhanst gas outlet intercommunication of air preheater, with the second end that first end is relative is provided with the outlet flue that is used for with the flue gas import intercommunication of dust remover, the inside of shell body is provided with a plurality of flue gas cooling module along the flow direction interval of flue gas, every adjacent two form the ash discharge cavity between the flue gas cooling module, every the bottom of ash discharge cavity all is provided with the ash discharge mouth that is used for with the defeated ash system of strength intercommunication.

2. The flue gas cooler according to claim 1, wherein the number of flue gas cooling modules is three and arranged at equal intervals inside the outer shell.

3. The flue gas cooler according to claim 2, wherein the three flue gas cooling modules include a first stage flue gas cooling module, a second stage flue gas cooling module and a third stage flue gas cooling module which are sequentially arranged at intervals along the flow direction of the flue gas, and the widths of the second stage flue gas cooling module and the third stage flue gas cooling module in the flow direction of the flue gas are smaller than the widths of the first stage flue gas cooling module in the flow direction of the flue gas.

4. The flue gas cooler of claim 3, wherein the second stage flue gas cooling module and the third stage flue gas cooling module are equal in width in a flow direction of the flue gas.

5. The flue gas cooler according to any one of claims 1 to 4, wherein the ash discharge opening is funnel-shaped at the bottom of the ash discharge chamber.

6. A pneumatic ash conveying system, which is characterized by comprising an ash storehouse, an ash conveying pipeline and the flue gas cooler as claimed in any one of claims 1 to 5, wherein the ash storehouse is respectively communicated with a plurality of ash discharge ports of the flue gas cooler through the ash conveying pipeline.

7. The pneumatic ash conveying system according to claim 6, further comprising a bin pump and a compressed gas supply device, wherein the ash conveying pipeline comprises a first pipeline and a second pipeline, an ash inlet of the bin pump is respectively communicated with the plurality of ash discharge ports of the flue gas cooler through the first pipeline, a first control valve is arranged on the first pipeline, an ash outlet of the bin pump is communicated with an ash inlet of the ash storage through the second pipeline, a second control valve is arranged on the second pipeline, an air inlet of the bin pump is communicated with an air outlet of the compressed gas supply device through the first gas conveying pipeline, and a third control valve is arranged on the first gas conveying pipeline.

8. The pneumatic ash conveying system according to claim 7, wherein an auxiliary air inlet and an auxiliary air outlet are further arranged on the bin pump, the auxiliary air inlet is communicated with the air outlet of the compressed air supply device through a second air conveying pipeline, a fourth control valve is further arranged on the second air conveying pipeline, and a fifth control valve is further arranged on the auxiliary air outlet.

9. A flue gas cooling system is characterized by comprising an air preheater, a dust remover, a fan heater, a condensed water supply system and the pneumatic ash conveying system according to any one of claims 6 to 8, wherein a flue gas inlet of the flue gas cooler is communicated with a flue gas outlet of the air preheater, a flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of the dust remover, an air outlet of the fan heater is communicated with an air inlet of the air preheater, a plurality of flue gas cooling modules in the flue gas cooler comprise a first stage flue gas cooling module, a second stage flue gas cooling module and a third stage flue gas cooling module which are sequentially arranged at intervals along the flow direction of flue gas, a water supply port and a first water outlet of the first stage flue gas cooling module are communicated with the condensed water supply system, a second water outlet of the first stage flue gas cooling module is communicated with a first water inlet of the second stage flue gas cooling module through a first communicating pipe, the water outlet of the second-stage flue gas cooling module is communicated with the water inlet of the air heater, the water outlet of the air heater is communicated with the water inlet of the third-stage flue gas cooling module, and the water outlet of the third-stage flue gas cooling module is communicated with the second water inlet of the second-stage flue gas cooling module through a second communicating pipe.

10. The flue gas cooling system according to claim 9, wherein the condensed water supply system comprises a condensed water conveying flow path and a number 8 low-pressure heater, a number 7 low-pressure heater, a number 6 low-pressure heater and a number 5 low-pressure heater which are sequentially communicated in series along the flow direction of the condensed water in the condensed water conveying flow path, the water supply port of the first stage flue gas cooling module is respectively communicated with the water outlet of the number 6 low-pressure heater and the water outlet of the number 7 low-pressure heater through a first flow path, and the first water outlet of the first stage flue gas cooling module is communicated with the water inlet of the number 5 low-pressure heater through a second flow path.

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