CN211290024U - Waste heat utilization system of circulating fluidized bed boiler of thermal power plant - Google Patents
Waste heat utilization system of circulating fluidized bed boiler of thermal power plant Download PDFInfo
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- CN211290024U CN211290024U CN201922213573.3U CN201922213573U CN211290024U CN 211290024 U CN211290024 U CN 211290024U CN 201922213573 U CN201922213573 U CN 201922213573U CN 211290024 U CN211290024 U CN 211290024U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model discloses a waste heat utilization system of a circulating fluidized bed boiler of a thermal power plant, which comprises a slag cooler, a low-temperature economizer, a shaft seal heater, a first low-pressure heater and a second low-pressure heater; the water side outlet of the shaft seal heater is respectively communicated with the water side inlet of the slag cooler and the water side inlet of the low-temperature economizer; a first regulating valve group is arranged on a pipeline between the shaft seal heater and the slag cooler, a second regulating valve group and a first low-pressure heater are sequentially arranged from an outlet of the first regulating valve group to a pipeline of the low-temperature economizer, and an electric gate valve is respectively arranged at an inlet and an outlet of the water side of the first low-pressure heater; the water side outlets of the slag cooler and the low-temperature economizer are both connected with a second low-pressure heater; one branch of condensed water at the outlet of the shaft seal heater enters the slag cooler to heat and recover the slag discharging heat of the boiler, and the other branch of condensed water passes through the first low-pressure heater and the low-temperature economizer to heat and recover the smoke discharging heat of the boiler, so that the utilization rate of the fuel heat of the boiler and the heat economy of a thermal power plant can be improved.
Description
Technical Field
The utility model relates to an ash and slag system of circulating fluidized bed boiler, concretely relates to waste heat utilization system of circulating fluidized bed boiler of thermal power plant.
Background
According to the analysis of a calorimetric method, only 35-42% of the fuel combustion heat quantity of a thermal power plant is converted into electric energy, the deslagging temperature of a circulating fluidized bed boiler is usually 850-950 ℃, the exhaust gas temperature is usually 130-150 ℃, and the heat loss of exhaust gas and deslagging is the two largest heat losses in various heat losses of the boiler, which is equivalent to 5-12% of the fuel heat quantity. If the heat discharged by the two parts can be efficiently recycled, the method makes a great contribution to energy conservation and emission reduction of the thermal power plant.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to above-mentioned problem, provide a thermal power plant's circulating fluidized bed boiler arrange sediment and exhaust fume waste heat utilization system, adopt following two kinds of forms parallel operation: 1) a boiler slag cooler is adopted to heat condensed water, and the heat of boiler slag discharge is recovered to a turbine thermodynamic system; 2) the low-temperature economizer is adopted to heat the condensed water, and the heat of the exhaust smoke of the boiler is recovered to a turbine thermodynamic system, so that the heat efficiency of the thermal power plant unit is improved.
In order to realize the purpose, the utility model discloses a technical scheme be: a waste heat utilization system of a circulating fluidized bed boiler of a thermal power plant comprises a slag cooler, a low-temperature economizer, a shaft seal heater, a first low-pressure heater and a second low-pressure heater;
the water side outlet of the shaft seal heater is respectively communicated with the water side inlet of the slag cooler and the water side inlet of the low-temperature economizer; a first regulating valve group is arranged on a pipeline between the shaft seal heater and the slag cooler, a second regulating valve group and a first low-pressure heater are sequentially arranged from an outlet of the first regulating valve group to a pipeline of the low-temperature economizer, and electric gate valves are arranged at a water side inlet and an outlet of the first low-pressure heater; a plurality of groups of slag coolers are connected in parallel, and the water side outlets of the slag coolers and the low-temperature economizer are connected with a second low-pressure heater;
the first low-pressure heater is the low-pressure heater with the lowest steam extraction parameter of the turbine regenerative system, and the steam extraction parameter of the second low-pressure heater is higher than the first heater by one grade.
First regulating valve group includes first manual gate valve, first pneumatic control valve, the manual gate valve of second and first electric gate valve, and first manual gate valve, first pneumatic control valve and the manual gate valve of second connect gradually, and the entry and the manual gate valve exit linkage first bypass pipeline of first manual gate valve, first electric gate valve set up on first bypass pipeline.
And a first flow measurement pore plate is arranged on a pipeline from the outlet of the first regulating valve group to the slag cooler.
And a second flow measuring pore plate and a second electric gate valve are arranged on a pipeline between the first flow measuring pore plate and the inlet of the slag cooler, and a third electric gate valve is arranged on an outlet pipeline of the slag cooler.
And a safety valve is also arranged between the inlet of the slag cooler and the second electric gate valve.
The second regulating valve group comprises a third manual gate valve, a second pneumatic regulating valve, a fourth manual gate valve and a fourth electric gate valve, the third manual gate valve, the second pneumatic regulating valve and the fourth manual gate valve are sequentially connected, an inlet of the third manual gate valve and an outlet of the fourth manual gate valve are connected with a second bypass pipeline, and the fourth electric gate valve is arranged on the second bypass pipeline.
And a seventh electric gate valve is arranged between the low-temperature economizer and the second low-pressure heater.
Compared with the prior art, the utility model discloses following beneficial effect has at least: a first regulating valve group is arranged on a water side outlet pipeline of the shaft seal heater, so that the flow of condensed water can be regulated, and a first waste heat utilization branch is formed from an outlet of the first regulating valve group to the slag cooler; the outlet of the first regulating valve group is connected with the second regulating valve group, then connected with the first low-pressure heater and finally connected with the low-temperature economizer to form a second waste heat utilization branch, the condensed water is subjected to primary heating by the first low-pressure heater and then enters the low-temperature economizer for heating, the condensed water is mixed with the water discharged from the slag cooler after being discharged from the low-temperature economizer and then enters the second low-pressure heater, and the two branches are connected in parallel and operate to heat the condensed water at the same time. By adopting the system, one branch of condensed water at the outlet of the shaft seal heater enters the slag cooler to heat and recover the slag discharging heat of the boiler, and the other branch of condensed water passes through the first low-pressure heater and then passes through the low-temperature economizer to heat and recover the smoke discharging heat of the boiler, so that the utilization rate of the fuel heat of the boiler and the heat economy of the thermal power plant are improved, and great contribution is made to energy conservation and emission reduction of the thermal power plant.
Furthermore, set up pneumatic control valve in the first regulating valve group, can conveniently adjust medium flow to set up manual gate valve respectively at pneumatic control valve's both ends, can be used for maintaining pneumatic control valve and prevent the reflux, the both ends of first regulating valve group set up the second passageway that bypass pipeline can regard as the export of bearing seal heater to realize the medium transport.
Furthermore, a first flow measuring orifice plate is arranged on a pipeline from an outlet of the first regulating valve group to the slag cooler, so that the total flow of the condensed water flowing to the slag cooler can be monitored in real time.
Furthermore, a second flow measurement pore plate and a second electric gate valve are arranged on a pipeline between the first flow measurement pore plate and the inlet of the slag cooler, the second flow measurement pore plate can be used for monitoring the water flow entering each slag cooler, the second electric gate valve can close the water flow entering the fault slag cooler at any time, and the third electric gate valve can prevent backflow.
Furthermore, a safety valve is arranged between the inlet of the slag cooler and the second electric gate valve, when a single slag cooler breaks down, the second electric gate valve and the third electric gate valve at the inlet and the outlet of the slag cooler are closed, condensed water in the pipe side of the slag cooler absorbs heat and evaporates, and the safety valve is opened and bounced after the pressure exceeds a set value of the safety valve, so that pipe explosion of the slag cooler is prevented.
Drawings
FIG. 1 is a schematic diagram of a waste heat utilization system of a circulating fluidized bed boiler.
FIG. 2 is a schematic diagram of a waste heat utilization system of the circulating fluidized bed boiler of the present invention.
In the drawings, 1-shaft seal heater; 2-first manual gate valve; 3-a first pneumatic regulating valve; 4-a second manual gate valve; 5-a first electric gate valve; 6-a first flow measurement orifice plate; 7-a second flow measurement orifice plate; 8-a second electric gate valve; 9-safety valve; 10-a slag cooler; 11-a third electric gate valve; 12-a third manual gate valve; 13-a second pneumatic regulating valve; 14-a fourth manual gate valve; 15-a fourth electric gate valve; 16-a fifth electric gate valve; 17-a first low pressure heater; 18-a sixth electric gate valve; 19-a low-temperature economizer; 20-seventh electric gate valve; 21-a second low pressure heater; 22-a boiler; 23-an air preheater; 24-a dust remover; 25-a draught fan; 26-a desulfurization absorption tower; 27-chimney.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A waste heat utilization system of a circulating fluidized bed boiler of a thermal power plant comprises a slag cooler 10, a low-temperature economizer 19, a shaft seal heater 1, a first low-pressure heater and a second low-pressure heater; wherein, the water side outlet of the shaft seal heater 1 is respectively communicated with the water side inlet of the slag cooler 10 and the water side inlet of the low-temperature economizer 19; the pipeline between the shaft seal heater 1 and the slag cooler 10 is provided with a first regulating valve group, the outlet of the first regulating valve group is sequentially provided with a second regulating valve group and a first low-pressure heater on the pipeline from the low-temperature economizer 19, the inlet and the outlet of the water side of the first low-pressure heater are respectively provided with a fifth electric gate valve 16 and a sixth electric gate valve 18, the multiple groups of slag coolers 10 are connected in parallel, and the outlets of the slag coolers 10 and the low-temperature economizer 19 are connected with the second low-pressure heater.
First regulating valve group includes first manual gate valve 2, first pneumatic control valve 3, the manual gate valve 4 of second and first electric gate valve 5, and first manual gate valve 2, first pneumatic control valve 3 and the manual gate valve 4 of second connect gradually, and first bypass pipeline is connected to the entry of first manual gate valve 2 and the manual gate valve 4 exit linkage of second, and first electric gate valve 5 sets up on first bypass pipeline.
A first flow measurement orifice plate 6 is arranged on a pipeline from an outlet of the first regulating valve group to the slag cooler 10.
A second flow measuring pore plate 7 and a second electric gate valve 8 are arranged on a pipeline between the first flow measuring pore plate 6 and the inlet of the slag cooler 10, and a third electric gate valve 11 is arranged on an outlet pipeline of the slag cooler 10.
The second regulating valve group comprises a third manual gate valve 12, a second pneumatic regulating valve 13, a fourth manual gate valve 14 and a fourth electric gate valve 15, the third manual gate valve 12, the second pneumatic regulating valve 13 and the fourth manual gate valve 14 are sequentially connected, an inlet of the third manual gate valve 12 and an outlet of the fourth manual gate valve 14 are connected with a second bypass pipeline, and the fourth electric gate valve 15 is arranged on the second bypass pipeline.
A seventh electric gate valve 20 is provided between the low-temperature economizer and the second low-pressure heater.
The waste heat utilization method of the circulating fluidized bed boiler of the thermal power plant, the slag cooler 10 and the low-temperature economizer 19 run in parallel.
The condensed water at the outlet of the shaft seal heater 1 passes through the slag cooler 10 and the first low-pressure heater respectively, and the condensed water heated by the first low-pressure heater enters the low-temperature economizer 19 to be heated and then is mixed with the condensed water heated by the slag cooler 10 to enter the second low-pressure heater.
The first low-pressure heater is the low-pressure heater with the lowest steam extraction parameter of the turbine regenerative system, and the steam extraction parameter of the second low-pressure heater is higher than that of the first low-pressure heater by one grade.
The system is to 300MW hierarchical unit, seven grades of heaters are established altogether to its steam turbine backheat system, including tertiary high pressure feed water heater, one-level oxygen-eliminating device and tertiary low pressure feed water heater, first low pressure feed water heater is No. 7 low pressure feed water heater 17, for taking out the steam low pressure feed water heater that the parameter is the lowest, and second low pressure feed water heater is No. 6 low pressure feed water heater 21, takes out the steam parameter and is higher than No. 7 low pressure feed water heater 17 a grade.
Condensed water at the outlet of the shaft seal heater 1 passes through the slag cooler 10 and the No. 7 low-pressure heater 17 respectively, and the condensed water heated by the No. 7 low-pressure heater 17 enters the low-temperature economizer 19 to be heated and then is mixed with the condensed water heated by the slag cooler 10 to enter the No. 6 low-pressure heater 21.
Referring to fig. 1, the utility model discloses circulating fluidized bed boiler's waste heat utilization system, including arranging the cold sediment ware in the boiler lower part and arranging the low temperature economizer in boiler rear portion draught fan export, cold sediment ware and low temperature economizer parallel operation.
The slag cooler 10 arranged at the lower part of the boiler has the slag inlet temperature of 900 +/-50 ℃, the slag outlet temperature of 150 +/-5 ℃, the condensed water at 47-68 ℃ at the outlet of the shaft seal heater 1 passes through a first regulating valve group consisting of a first manual gate valve 2, a first pneumatic regulating valve 3, a second manual gate valve 4 and a first electric gate valve 5, a first flow measuring orifice plate 6, a plurality of slag coolers 10 running in parallel, a second flow measuring orifice plate 7, a second electric gate valve 8 and a safety valve 9 are all arranged on an inlet pipeline of the slag coolers 10 along the medium flow direction, the condensed water enters the slag coolers 10 to exchange heat with slag, the absorbed heat temperature rises to 90 +/-5 ℃, the total output of the slag coolers 10 is designed to be 200%, when one of the slag coolers fails, the second electric gate valve 8 at the inlet and the third electric gate valve 11 at the outlet of the slag cooler are closed, the condensed water in the pipe side of the failed slag cooler absorbs heat and evaporates, the pressure exceeds the set value of the safety valve and jumps, preventing the slag cooler 10 from tube explosion.
The inlet flue gas temperature of the low-temperature economizer 19 is 130-150 ℃, the outlet flue gas temperature is 95-115 ℃, the low-temperature economizer 19 is arranged on the other branch of the condensed water at the outlet of the first regulating valve group, the condensed water is heated to 82-85 ℃ through a second regulating valve group, a fifth electric gate valve 16 and a No. 7 low-pressure heater 17 which are composed of a third manual gate valve 12, a second pneumatic regulating valve 13, a fourth manual gate valve 14 and a fourth electric gate valve 15, the heat is absorbed after the heat exchange between the heat and the flue gas in the low-temperature economizer through a sixth electric gate valve 18, the heat and the condensed water at the outlet of the third electric gate valve 11 are combined and enter a No. 6 low-pressure heater 21, and the amount of the condensed water entering the low-temperature economizer 19 is regulated by the second regulating valve group.
Referring to fig. 2, high temperature slag at 900 ± 50 ℃ generated during the operation of the circulating fluidized bed boiler 22 of the thermal power plant is discharged into the slag cooler 10; the flue gas at the tail part of the boiler is exhausted into the atmosphere through an air preheater 23, a dust remover 24, an induced draft fan 25, a low-temperature economizer 19, a desulfurization absorption tower 26 and a chimney 27.
The foregoing is only a preferred embodiment of the present invention and is not intended to limit the invention in any way, and those skilled in the art will appreciate that various modifications and substitutions can be made without departing from the spirit and principles of the invention, and that such modifications and substitutions also fall within the scope of the appended claims.
Claims (7)
1. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant is characterized by comprising a slag cooler (10), a low-temperature economizer (19), a shaft seal heater (1), a first low-pressure heater and a second low-pressure heater;
a water side outlet of the shaft seal heater (1) is respectively communicated with a water side inlet of the slag cooler (10) and a water side inlet of the low-temperature economizer (19); a first regulating valve group is arranged on a pipeline between the shaft seal heater (1) and the slag cooler (10), a second regulating valve group and a first low-pressure heater are sequentially arranged on a pipeline from an outlet of the first regulating valve group to the low-temperature economizer (19), and an electric gate valve is arranged at an inlet and an outlet of the water side of the first low-pressure heater; a plurality of groups of slag coolers (10) are connected in parallel, and water side outlets of the slag coolers (10) and the low-temperature economizer (19) are connected with a second low-pressure heater;
the first low-pressure heater is the low-pressure heater with the lowest steam extraction parameter of the turbine regenerative system, and the steam extraction parameter of the second low-pressure heater is higher than that of the first low-pressure heater by one grade.
2. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant as claimed in claim 1, wherein the first regulating valve group comprises a first manual gate valve (2), a first pneumatic regulating valve (3), a second manual gate valve (4) and a first electric gate valve (5), the first manual gate valve (2), the first pneumatic regulating valve (3) and the second manual gate valve (4) are sequentially connected, an inlet of the first manual gate valve (2) and an outlet of the second manual gate valve (4) are connected with a first bypass pipeline, and the first electric gate valve (5) is arranged on the first bypass pipeline.
3. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant as claimed in claim 1, characterized in that a first flow measurement orifice plate (6) is arranged on a pipeline from an outlet of the first regulating valve group to the slag cooler (10).
4. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant as claimed in claim 3, characterized in that a second flow measurement orifice plate (7) and a second electric gate valve (8) are arranged on a pipeline between the first flow measurement orifice plate (6) and the inlet of the slag cooler (10), and a third electric gate valve (11) is arranged on an outlet pipeline of the slag cooler (10).
5. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant as claimed in claim 1, characterized in that a safety valve (9) is further arranged between the inlet of the slag cooler (10) and the second electric gate valve (8).
6. The waste heat utilization system of the circulating fluidized bed boiler of the thermal power plant as claimed in claim 1, wherein the second regulating valve group comprises a third manual gate valve (12), a second pneumatic regulating valve (13), a fourth manual gate valve (14) and a fourth electric gate valve (15), the third manual gate valve (12), the second pneumatic regulating valve (13) and the fourth manual gate valve (14) are sequentially connected, an inlet of the third manual gate valve (12) and an outlet of the fourth manual gate valve (14) are connected with a second bypass pipeline, and the fourth electric gate valve (15) is arranged on the second bypass pipeline.
7. The waste heat utilization system of a circulating fluidized bed boiler of a thermal power plant according to claim 1, characterized in that a seventh electric gate valve (20) is provided between the low-temperature economizer and the second low-pressure heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922213573.3U CN211290024U (en) | 2019-12-11 | 2019-12-11 | Waste heat utilization system of circulating fluidized bed boiler of thermal power plant |
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| CN201922213573.3U CN211290024U (en) | 2019-12-11 | 2019-12-11 | Waste heat utilization system of circulating fluidized bed boiler of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836365A (en) * | 2019-12-11 | 2020-02-25 | 中国电力工程顾问集团西北电力设计院有限公司 | Waste heat utilization system and method for circulating fluidized bed boiler of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836365A (en) * | 2019-12-11 | 2020-02-25 | 中国电力工程顾问集团西北电力设计院有限公司 | Waste heat utilization system and method for circulating fluidized bed boiler of thermal power plant |
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