CN211260759U - High-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system - Google Patents
High-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system Download PDFInfo
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- CN211260759U CN211260759U CN201921368934.5U CN201921368934U CN211260759U CN 211260759 U CN211260759 U CN 211260759U CN 201921368934 U CN201921368934 U CN 201921368934U CN 211260759 U CN211260759 U CN 211260759U
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Abstract
A high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system relates to the field of secondary reheating tower furnace manufacturing. The utility model relates to a solve the economizer arrangement mode among the prior art and have boiler height, bear heavily, with high costs, flue gas damper is above the economizer, the economizer receives flue gas damper influence, the big problem of export working medium temperature deviation, a high-efficient wide load secondary reheat tower furnace economizer stage arrangement system include water-cooling wall, vapour and liquid separator, export pipe, one-level over heater, tertiary over heater, high-pressure second level re-heater, low pressure second level re-heater, second level over heater, low pressure first level re-heater, high pressure first level re-heater, upper portion economizer, lower part economizer, deNOx control system, connecting pipe, tower furnace main part, afterbody flue, water storage tank, circulating pump and connecting tube; the utility model discloses use the position arrangement at tower reheating furnace's well economizer, solve the big problem of export working medium temperature deviation.
Description
Technical Field
The utility model relates to a high-efficient wide load secondary reheat tower furnace economizer grading arrangement system belongs to secondary reheat tower furnace and makes the field.
Background
The existing secondary reheating tower furnace has high furnace chamber height, a coal economizer outlet is connected with a water wall inlet by adopting a down pipe, a gas-liquid separator is connected with a primary superheater by adopting a hanging pipe type, the coal economizer is arranged at the uppermost part of the furnace chamber, and a flue gas adjusting baffle is arranged above the coal economizer. The arrangement mode has the problems that the lengths of a water supply pipeline, a hanging pipe and a descending pipe are long, the boiler is high in height, large in bearing capacity and high in cost, a flue gas adjusting baffle is arranged above the economizer, the economizer is influenced by the flue gas adjusting baffle, and the temperature deviation of outlet working media is large. In addition, the limitation of low-load denitration inlet temperature is realized, the lowest load of boiler operation is limited, the peak regulation capability is poor, and the requirement of flexible operation of a unit is not met. It is therefore highly desirable to provide a new arrangement of economizers in a tower furnace.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve among the prior art economizer arrangement mode and have boiler height, bear heavily, with high costs, flue gas adjusting baffle is in the economizer top, and the economizer receives the influence of flue gas adjusting baffle, the big problem of export working medium temperature deviation. The grading arrangement system for the economizer of the high-efficiency wide-load secondary reheating tower furnace is provided.
A high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system comprises a water-cooled wall, a gas-liquid separator, an outlet guide pipe, a primary superheater, a tertiary superheater, a high-pressure secondary reheater, a low-pressure secondary reheater, a secondary superheater, a low-pressure primary reheater, a high-pressure primary reheater, an upper economizer, a lower economizer, a denitration system, a connecting pipe, a tower furnace main body, a tail flue, a water storage tank, a circulating pump and a connecting guide pipe;
the low-pressure primary reheater and the high-pressure primary reheater are arranged in the tower-type furnace main body through a bracket, the low-pressure primary reheater and the high-pressure primary reheater are arranged in parallel relatively, a secondary superheater, a low-pressure secondary reheater, a high-pressure secondary reheater, a tertiary superheater and a primary superheater are sequentially arranged below the low-pressure primary reheater from top to bottom, the secondary superheater, the low-pressure secondary reheater, the high-pressure secondary reheater, the tertiary superheater and the primary superheater are all arranged in the tower-type furnace main body through brackets, a water-cooled wall is arranged on the inner wall of the tower-type furnace main body, a tail flue is communicated with the tower-type furnace main body, an upper economizer is arranged at one end, close to the tower-type furnace main body, of the tail flue, the upper economizer is arranged in the tail flue, a lower economizer is arranged at the, the upper coal economizer is connected with the lower coal economizer through a connecting pipe, the denitration system is arranged between the upper coal economizer and the lower coal economizer and is arranged inside the tail flue, the gas-liquid separator is arranged outside the tower furnace main body, the input end of the gas-liquid separator is connected with the water wall outlet header through a downcomer, the liquid output end of the gas-liquid separator is connected with the input end of the water storage tank, the output end of the water storage tank is connected with the input end of the circulating pump through a connecting pipe, the output end of the circulating pump is connected with an external water supply pipe, the gas output end of the gas-liquid separator is connected with one end of an outlet pipe, the other end of the outlet pipe penetrates through the tower furnace main body and is connected with the inlet end of the primary superheater through a hanging pipe, the outlet end of the primary superheater is connected with the inlet end of the secondary superheater through the header and a pipeline, and the, the outlet end of the tertiary superheater is connected with the inlet end of an external ultrahigh pressure turbine through a header and a pipeline, the outlet end of the external ultrahigh pressure turbine is connected with the inlet end of a high-pressure primary reheater through a pipeline, the outlet end of the high-pressure primary reheater is connected with the inlet end of a high-pressure secondary reheater through a header and a pipeline, the outlet end of the high-pressure secondary reheater is connected with the inlet end of an external high pressure turbine through a header and a pipeline, the outlet end of the external high pressure turbine is connected with the inlet end of a low-pressure primary reheater, the outlet end of the low-pressure primary reheater is connected with the inlet end of a low-pressure secondary reheater through a header and a pipeline, and the outlet end.
The utility model discloses for prior art's beneficial effect:
the utility model discloses a move the original economizer heating surface of tower stove behind the afterbody flue, the furnace height of tower stove has reduced, and water supply pipe, hang pipe and downtake length and have all been shortened, and boiler weight alleviates, and the cost is reduced, makes the cost reduce 15% at least, and the flue gas baffle is adjusted more in a flexible way, and economizer working medium sidesway reduces, more helps reaching reheater steam temperature. After the economizers are classified, the heating surface of one part of the economizer is moved to the lower part of the denitration system, so that the outlet smoke temperature of the upper economizer is improved, the requirement of denitration inlet smoke temperature is met when the economizer operates under a low-load working condition, the low-load working condition of the boiler is further reduced, and the purpose of flexible peak regulation is achieved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the gas flow direction of the present invention;
in the figure, 1 water wall, 2 gas-liquid separator, 3 outlet conduit, 4 primary superheater, 5 tertiary superheater, 6 high-pressure secondary reheater, 7 low-pressure secondary reheater, 8 secondary superheater, 9 low-pressure primary reheater, 10 high-pressure primary reheater, 11 upper economizer, 12 lower economizer, 13 flue gas adjusting baffle, 14 denitration system, 15 intermediate baffle, 16 connecting pipe, 17 tower furnace body, 18 tail flue, 19 denitration system accommodating cavity, 20 water storage tank, 21 circulating pump, 22 connecting conduit, A water supply pipeline, B economizer inlet header, C economizer outlet header, D front water wall outlet header, E water wall outlet header, F water storage tank body, G separator, H primary superheater inlet header, I primary superheater outlet header, J secondary superheater inlet header, K secondary superheater outlet header, L tertiary superheater inlet header, L water wall outlet header, the system comprises an M tertiary superheater outlet header, an N ultrahigh pressure steam turbine, an O high pressure primary reheater inlet header, a P high pressure primary reheater outlet header, a Q high pressure secondary reheater inlet header, an R high pressure steam turbine, an S low pressure primary reheater inlet header, a T low pressure primary reheater outlet header, a U low pressure secondary reheater inlet header and a V low pressure steam turbine.
Detailed Description
The first embodiment is as follows: specifically explaining the present embodiment with reference to fig. 1, the economizer stage-arrangement system of a high-efficiency wide-load secondary reheating tower furnace according to the present embodiment includes a water wall 1, a gas-liquid separator 2, an outlet conduit 3, a primary superheater 4, a tertiary superheater 5, a high-pressure secondary reheater 6, a low-pressure secondary reheater 7, a secondary superheater 8, a low-pressure primary reheater 9, a high-pressure primary reheater 10, an upper economizer 11, a lower economizer 12, a denitrification system 14, a connecting pipe 16, a tower furnace main body 17, a tail flue 18, a water storage tank 20, a circulating pump 21, and a connecting conduit 22;
the low-pressure primary reheater 9 and the high-pressure primary reheater 10 are arranged inside a tower furnace main body 17 through a bracket, the low-pressure primary reheater 9 and the high-pressure primary reheater 10 are arranged in parallel relatively, a secondary superheater 8, a low-pressure secondary reheater 7, a high-pressure secondary reheater 6, a tertiary superheater 5 and a primary superheater 4 are sequentially arranged below the low-pressure primary reheater 9 from top to bottom, the secondary superheater 8, the low-pressure secondary reheater 7, the high-pressure secondary reheater 6, the tertiary superheater 5 and the primary superheater 4 are all arranged inside the tower furnace main body 17 through brackets, a water wall 1 is arranged on the inner wall of the tower furnace main body 17, a tail flue 18 is communicated with the tower furnace main body 17, an upper economizer 11 is arranged at one end of the tail flue 18 close to the tower furnace main body 17, the upper economizer 11 is arranged inside the tail flue 18, a lower economizer 12 is arranged at the lower part of the upper, the lower coal economizer 12 is arranged inside the tail flue 18, the upper coal economizer 11 is connected with the lower coal economizer 12 through a connecting pipe 16, the denitration system 14 is arranged between the upper coal economizer 11 and the lower coal economizer 12, the denitration system 14 is arranged inside the tail flue 18, the gas-liquid separator 2 is arranged outside the tower furnace main body, the input end of the gas-liquid separator 2 is connected with the outlet header of the water-cooled wall 1 through a downcomer, the liquid output end of the gas-liquid separator 2 is connected with the input end of a water storage tank 20, the output end of the water storage tank 20 is connected with the input end of a circulating pump 21 through a connecting pipe 22, the output end of the circulating pump 21 is connected with an external water supply pipe, the gas output end of the gas-liquid separator 2 is connected with one end of an outlet pipe 3, the other end of the outlet pipe 3 passes through the tower furnace main body 17 and is connected with, the outlet end of the first-stage superheater 4 is connected with the inlet end of the second-stage superheater 8 through a header and a pipeline, the outlet end of the second-stage superheater 8 is connected with the inlet end of the third-stage superheater 9 through a header and a pipeline, the outlet end of the third-stage superheater 9 is connected with the inlet end of an external ultrahigh pressure turbine through a pipeline, the outlet end of the external ultrahigh pressure turbine is connected with the inlet end of a high-pressure first-stage reheater 10 through a header and a pipeline, the outlet end of the high-pressure first-stage reheater 10 is connected with the inlet end of a high-pressure second-stage reheater 6 through a header and a pipeline, the outlet end of the high-pressure second-stage reheater 6 is connected with the inlet end of an external high-pressure turbine, the outlet end of the external high-pressure turbine is connected with the inlet end of a low-pressure first-stage reheater 9, the outlet end of the low-.
The utility model discloses with original secondary reheat tower furnace hearthThe coal economizer on the upper part is moved to the tail flue, so that the height of the hearth can be effectively reduced, the lengths of a water supply pipeline, a hanging pipe and a descending pipe are all shortened, the height of the boiler is reduced, the bearing is lightened, and the cost is reduced; after the coal economizer is moved to the tail flue, the working medium side deviation of the coal economizer is reduced, and the flexibility of the smoke adjusting baffle is improved; meanwhile, the tail flue economizer is graded, so that the smoke temperature at the denitration inlet is improved, the temperature of the denitration catalyst under the low-load operation condition is ensured, the wide-load condition can meet the emission requirement of the nitrogen oxide of the coal-fired boiler, and in the embodiment, the smoke can be efficiently removed of the nitrogen oxide NO in the smoke through the SCR denitration systemxThe inlet of the SCR denitration system requires that the smoke temperature reaches the catalytic temperature only at about 300-400 ℃, so that the normal operation of the denitration system under low load can be ensured after the lower economizer is moved to the denitration system.
The second embodiment is as follows: in this embodiment, the system further includes an intermediate partition 15, the intermediate partition 15 is disposed between the low-pressure primary reheater 9 and the high-pressure primary reheater 10, and the intermediate partition 15 is fixedly connected to an inner wall of the tower furnace main body 17.
So set up, can carry out effective distribution to low pressure side and high pressure side flue gas volume through adjusting the baffle, guarantee that the reheater steam temperature homoenergetic reaches the target temperature.
The third concrete implementation mode: in this embodiment, the distance between the bottom of the primary superheater 4 and the bottom of the tower furnace main body 17 is L1, the height of the tower furnace main body 17 is L2, and L1 is 1/2 of L2.
So set up, prevent that one-level over heater 7 from being too high or crossing lowly, it leads to furnace height to be high excessively, cross lowly, lead to the burning insufficient, and increased the length of hanging the pipe, simultaneously so arrange, can make one-level over heater 4, second grade over heater 8, the single-stage enthalpy of tertiary over heater 5 increases for a short time, the working medium side is heated evenly, the same screen deviation is little, high pressure second grade re-heater 6 and low pressure second grade re-heater 7 are arranged in the low reaches of the furnace export smoke window in well cigarette temperature district, high pressure first grade re-heater 10 and low pressure first grade re-heater 9 are arranged respectively in the moderate front and back flue of cigarette temperature level, guarantee good thermoregulation characteristic and great.
The fourth concrete implementation mode: the present embodiment further defines a staged arrangement system for an economizer of a high-efficiency wide-load double reheat tower furnace according to the first embodiment, and all the pipes used in the system are made of heat-resistant and corrosion-resistant materials.
The fifth concrete implementation mode: in this embodiment, the system for arranging the economizers of the high-efficiency wide-load secondary reheating tower furnace in stages according to the first embodiment is further defined, and in this embodiment, the system further includes a flue gas adjusting baffle 13, the flue gas adjusting baffle 13 is disposed above the low-pressure primary reheater 9 and the high-pressure primary reheater 10, and the flue gas adjusting baffle 13 is rotatably connected to the inner wall of the tower furnace main body 17.
So set up, flue gas adjusting baffle 13 is used for adjusting the reheater steam temperature, produces the influence through the flue gas volume of adjusting the left and right sides to the heating surface heat transfer, adjusts high low pressure side reheater steam temperature.
The sixth specific implementation mode: in the embodiment, the grading arrangement system of the economizer of the high-efficiency wide-load secondary reheating tower furnace is further limited, in the embodiment, the tail flue 18 and the tower furnace main body 17 are detachably connected, a flue gas pipeline is arranged on the outer wall of the tower furnace main body 17, and one end of the tail flue 18 is sleeved on the flue gas pipeline and is clamped tightly by a locking ring.
The seventh embodiment: in the embodiment, the step arrangement system of the economizer of the high-efficiency wide-load secondary reheating tower furnace is further limited, in the embodiment, a denitration system placing cavity 19 is arranged in the middle of the tail flue 18, and the denitration system placing cavity 19 is detachably connected with the tail flue 18.
So set up, the change of the deNOx systems 14 of being convenient for has prevented to carry out whole change to afterbody flue 18 when deNOx systems 14 reachs life, causes bigger maintenance cost.
Principle of operation
The device provided by the utility model changes the position of the original economizer, moves the economizer from the top of the original boiler to the tail flue, the feed water enters the inlet header of the lower economizer 12, enters the lower economizer 12 and the upper economizer 11 through the pipeline, passes through the outlet header of the upper economizer 11 and the pipeline, enters the inlet header of the lower water-cooling wall 1, enters the gas-liquid separator 2 through the water-cooling wall 1 and enters the gas-liquid separator 2 from the outlet header of the water-cooling wall 1 and the pipeline to be arranged outside the tower furnace main body, the input end of the gas-liquid separator 2 is connected with the outlet header of the water-cooling wall 1 through the down pipe, the liquid output end of the gas-liquid separator 2 is connected with the input end of the water storage tank 20, the output end of the water storage tank 20 is connected with the input end of the circulating pump 21 through the connecting pipe 22, the output end of the circulating pump 21 is connected with the external water supply pipe, the gas output end of the, the other end of the outlet conduit 3 passes through the tower furnace main body 17 and is connected with the inlet end of the primary superheater 4 through a hanging pipe, the gas enters the secondary superheater 8 from the primary superheater 4 and then enters the tertiary superheater 5 from the secondary superheater 8 to realize primary superheating, the gas with certain heat enters the ultrahigh pressure steam engine to work, the exhaust steam discharged after the gas works in the ultrahigh pressure steam engine enters the high pressure primary reheater 10 through a pipeline and then enters the high pressure secondary reheater 9 to be reheated for the first time, the exhaust steam after the primary reheating also has certain heat, but the heat is reduced compared with the exhaust steam of the primary superheating, therefore, the exhaust steam after the primary superheating can enter the high pressure steam engine to work, the exhaust steam after the work in the high pressure steam engine enters the low pressure primary reheater 6 and the low pressure secondary reheater 7 to be superheated for the last time, the temperature of the dead steam after being overheated in the process is further reduced, the dead steam can only be used for a medium-low pressure steam engine to do work, and the dead steam after doing work does not have the need of heating at the same time, so the dead steam can be directly discharged as waste gas.
Claims (7)
1. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system is characterized by comprising a water wall (1), a gas-liquid separator (2), an outlet conduit (3), a primary superheater (4), a tertiary superheater (5), a high-pressure secondary reheater (6), a low-pressure secondary reheater (7), a secondary superheater (8), a low-pressure primary reheater (9), a high-pressure primary reheater (10), an upper economizer (11), a lower economizer (12), a denitration system (14), a connecting pipe (16), a tower furnace main body (17), a tail flue (18), a water storage tank (20), a circulating pump (21) and a connecting conduit (22);
the low-pressure primary reheater (9) and the high-pressure primary reheater (10) are arranged inside a tower type furnace main body (17) through a support, the low-pressure primary reheater (9) and the high-pressure primary reheater (10) are arranged in parallel relatively, a secondary superheater (8), a low-pressure secondary reheater (7), a high-pressure secondary reheater (6), a tertiary superheater (5) and a primary superheater (4) are sequentially arranged below the low-pressure primary reheater (9) from top to bottom, the secondary superheater (8), the low-pressure secondary reheater (7), the high-pressure secondary reheater (6), the tertiary superheater (5) and the primary superheater (4) are all arranged inside the tower type furnace main body (17) through supports, a water cooling wall (1) is arranged on the inner wall of the tower type furnace main body (17), a tail flue (18) is communicated with the tower type furnace main body (17), an upper coal economizer (11) is arranged at a position close to, the upper coal economizer (11) is arranged in the tail flue (18), the lower coal economizer (12) is arranged at the lower part of the upper coal economizer (11), the lower coal economizer (12) is arranged in the tail flue (18), the upper coal economizer (11) is connected with the lower coal economizer (12) through a connecting pipe (16), a denitration system (14) is arranged between the upper coal economizer (11) and the lower coal economizer (12), the denitration system (14) is arranged in the tail flue (18), a gas-liquid separator (2) is arranged outside the tower furnace main body, the input end of the gas-liquid separator (2) is connected with an outlet collection box of the water-cooled wall (1) through a descending pipe, the liquid output end of the gas-liquid separator (2) is connected with the input end of the water storage tank (20), the output end of the water storage tank (20) is connected with the input end of a circulating pump (21) through a connecting pipe (22), the output end of a circulating pump (21) is connected with an external water supply pipe, the gas output end of a gas-liquid separator (2) is connected with one end of an outlet conduit (3), the other end of the outlet conduit (3) passes through a tower furnace main body (17) and is connected with the inlet end of a primary superheater (4) through a hanging pipe, the outlet end of the primary superheater (4) is connected with the inlet end of a secondary superheater (8) through a header and a pipeline, the outlet end of the secondary superheater (8) is connected with the inlet end of a tertiary superheater (5) through a header and a pipeline, the outlet end of the tertiary superheater (5) is connected with the inlet end of an external ultrahigh pressure turbine through a header and a pipeline, the outlet end of the external ultrahigh pressure turbine is connected with the inlet end of a high-pressure primary reheater (10) through a pipeline, the outlet end of the high-pressure primary reheater (10) is connected with, the outlet end of the high-pressure secondary reheater (6) is connected with the inlet end of an external high-pressure turbine through a header and a pipeline, the outlet end of the external high-pressure turbine is connected with the inlet end of a low-pressure primary reheater (9), the outlet end of the low-pressure primary reheater (9) is connected with the inlet end of the low-pressure secondary reheater (7) through a header and a pipeline, and the outlet end of the low-pressure secondary reheater (7) is connected with the inlet end of a medium-low pressure turbine through a header and a pipeline.
2. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 1, wherein: the system further comprises a middle partition plate (15), the middle partition plate (15) is arranged between the low-pressure primary reheater (9) and the high-pressure primary reheater (10), and the middle partition plate (15) is fixedly connected with the inner wall of the tower furnace main body (17).
3. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 1, wherein: the distance between the bottom of the primary superheater (4) and the bottom of the tower furnace main body (17) is L1, the height of the tower furnace main body (17) is L2, and L1 is 1/2 of L2.
4. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 1, wherein: the pipes used in the system are all made of heat-resistant and corrosion-resistant materials.
5. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 2, wherein: the system further comprises a flue gas adjusting baffle (13), the flue gas adjusting baffle (13) is arranged above the low-pressure primary reheater (9) and the high-pressure primary reheater (10), and the flue gas adjusting baffle (13) is rotatably connected with the inner wall of the tower furnace main body (17).
6. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 1, wherein: the tail flue (18) and the tower furnace main body (17) are detachably connected, a flue gas pipeline is arranged on the outer wall of the tower furnace main body (17), and one end of the tail flue (18) is sleeved on the flue gas pipeline and clamped tightly through a locking ring.
7. The high-efficiency wide-load secondary reheating tower furnace economizer grading arrangement system according to claim 2 or 5, wherein: the denitration system mounting cavity (19) is arranged in the middle of the tail flue (18), and the denitration system mounting cavity (19) is detachably connected with the tail flue (18).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A kind of efficient wide load double reheat tower-type furnace economizer hierarchical arrangement system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A kind of efficient wide load double reheat tower-type furnace economizer hierarchical arrangement system |
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