CN217568207U - Full-load denitration system - Google Patents
Full-load denitration system Download PDFInfo
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- CN217568207U CN217568207U CN202221588725.3U CN202221588725U CN217568207U CN 217568207 U CN217568207 U CN 217568207U CN 202221588725 U CN202221588725 U CN 202221588725U CN 217568207 U CN217568207 U CN 217568207U
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Abstract
The utility model discloses a full load deNOx systems, low temperature over heater and economizer have set gradually along the flue gas circulation direction in the first vertical flue, and static mixer and ammonia injection grid have set gradually along the flue gas circulation direction in the vertical flue of second, denitrification facility's entrance is provided with the rectification grid, is provided with the catalyst layer in the denitrification facility, and the one end of bypass flue is linked together with turning to the room, and the other end of bypass flue is linked together with economizer export horizontal line, and is provided with turn-off door and governing door on the bypass flue, and the economizer inlet channel is linked together with the water inlet of economizer, and the delivery port and the economizer outlet conduit of economizer are linked together, and the one end and the economizer inlet conduit of economizer feedwater bypass are linked together, and the other end and the economizer outlet conduit of economizer feedwater bypass are linked together, be provided with flow control valve on the economizer feedwater way, this system has the high and wide characteristics of control range of flexibility.
Description
Technical Field
The utility model belongs to the technical field of the denitration, a full load deNOx systems is related to.
Background
With the stricter of national policies on flue gas control, the selective catalytic reduction SCR technology is widely applied in the field of flue gas denitration, the denitration efficiency of the technology is high, but the catalyst can normally work only within a proper range of flue gas temperature (300-420 ℃). In recent years, new energy power generation is rapidly developed, and a thermal power plant is used as 'ballast stone for electric power safety' in order to match with power grid peak regulation. On one hand, when the new energy power generation is in a peak period, the thermal power plant needs to operate under an ultralow load, so that the smoke temperature is reduced, the smoke temperature at the inlet of the catalyst is also lower than 380 ℃, and the normal operation of the catalyst is influenced. On the other hand, the environmental protection department strengthens the examination of the starting process of the thermal power plant, and the strict control of the emission of the nitrogen oxides in the starting process of the thermal power plant within the limit value is also important.
In the prior wide-load denitration technology, one is that a flue gas bypass flue extracts flue gas from an inlet of a low-temperature superheater, a coal economizer is short-circuited, the extracted high-temperature flue gas is mixed with the low-temperature flue gas in a main path, and the temperature of the flue gas at an inlet of a catalyst is increased; the other economizer water supply bypass controls the heat exchange quantity of the economizer and the flue gas by controlling the flow of the feed water entering the economizer, so that the temperature drop of the flue gas is reduced, and the temperature of the flue gas at the inlet of the catalyst is ensured to be within a reasonable range. The two technologies have the defects that the bypass flue is limited by the actual space requirement, and the temperature rise range of the economizer feed water bypass is limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a full load deNOx systems, this system has the high and wide characteristics of control range of flexibility.
In order to achieve the purpose, the full-load denitration system comprises a first vertical flue, a second vertical flue, a horizontal flue, a denitration device, a steering chamber, an economizer outlet horizontal flue and a bypass flue;
the outlet of the hearth is communicated with a denitration device through a steering chamber, a first vertical flue, a horizontal flue at the outlet of an economizer, a second vertical flue, a horizontal flue and the denitration device, wherein a low-temperature superheater and the economizer are sequentially arranged in the first vertical flue along the smoke flowing direction, a static mixer and an ammonia injection grid are sequentially arranged in the second vertical flue along the smoke flowing direction, a rectifying grid is arranged at the inlet of the denitration device, a catalyst layer is arranged in the denitration device, one end of a bypass flue is communicated with the steering chamber, the other end of the bypass flue is communicated with the horizontal pipeline at the outlet of the economizer, a shutoff door and an adjusting door are arranged on the bypass flue, a water inlet pipeline of the economizer is communicated with a water inlet of the economizer, a water outlet of the economizer is communicated with a water outlet pipeline of the economizer, one end of a water supply bypass of the economizer is communicated with the water inlet pipeline of the economizer, the other end of the water supply bypass of the economizer is communicated with the water outlet pipeline of the economizer, and a flow adjusting valve is arranged on the water supply bypass of the economizer.
A first group of guide plates are arranged at the communication position of the horizontal pipeline at the outlet of the coal economizer and the first vertical flue.
And a second group of guide plates are arranged at the communication position of the first vertical flue and the horizontal flue.
And a third group of guide plates are arranged at the communication position of the horizontal flue and the inlet of the denitration device.
In the starting process of the power plant, the opening degree of the flow regulating valve is regulated to 100%, the opening degree of the shutoff valve is regulated to 100%, the opening degree of the regulating valve is regulated to 100%, the smoke temperature at the inlet of the low-temperature superheater is 300-400 ℃, the smoke temperature continues to rise along with the starting and grid-connection process of the power plant, and in order to ensure that the smoke temperature at the inlet of the catalyst layer meets the requirement, the flow regulating valve is gradually closed firstly, then the regulating valve is gradually closed, and finally the shutoff valve is gradually closed.
In the process of high-load operation of a power plant, the regulating valve is completely closed, the shutoff valve is completely closed, and the flow regulating valve is completely closed.
In the low-load operation in-process of power plant, when the power plant participated in the peak shaving, the load reduced gradually, when the load reduced the flue gas temperature of catalyst layer entrance and was less than 300 ℃, then opened the shutoff door, opened the regulating gate, guaranteed that the flue gas temperature of catalyst layer entrance satisfies the demands, when the regulating gate was opened completely, still can not guarantee catalyst entrance flue gas temperature, then opened flow control valve, adjust flow control valve's aperture, wherein, when the load of boiler is stabilized when 25% load, flow control valve no longer adjusted.
In the shutdown process of the power plant, the opening degree of the flow regulating valve is regulated to 100%, the opening degree of the shutoff valve is regulated to 100%, and the opening degree of the flow regulating valve is regulated to 100%.
The utility model discloses following beneficial effect has:
full load deNOx systems when concrete operation, adopt bypass flue gas and bypass economizer feedwater mode, through adjusting flow control valve, turn-off door and governing door to satisfy the power plant and open the machine, the high load operation of power plant, the low-load operation of power plant and the requirement that the power plant shut down, economizer feedwater bypass temperature lifting range is great, has the high and wide characteristics of control range of flexibility.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a connection diagram of the economizer.
Wherein, 1 is a steering chamber, 2 is a low-temperature superheater, 3 is an economizer, 4 is an economizer outlet horizontal flue, 5 is a bypass flue, 6 is a shutoff valve, 7 is an adjusting valve, 8 is a first group of guide plates, 9 is a static mixer, 10 is an ammonia injection grid, 11 is a second group of guide plates, 12 is a third group of guide plates, 13 is a rectifying grid, 14 is a catalyst layer, and 15 is a flow adjusting valve.
Detailed Description
In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
The structural schematic according to the disclosed embodiment of the invention is shown in the attached drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 and 2, the full-load denitration system of the present invention includes a first vertical flue, a second vertical flue, a horizontal flue, a denitration device, a turning chamber 1, a low temperature superheater 2, an economizer 3, an economizer outlet horizontal flue 4, a bypass flue 5, a shutoff gate 6, a regulating gate 7, a first group of guide plates 8, a static mixer 9, an ammonia injection grid 10, a second group of guide plates 11, a third group of guide plates 12, a rectification grid 13, and a flow regulating valve 15;
the outlet of the hearth is communicated with a steering chamber 1, a first vertical flue, a horizontal flue 4 at the outlet of an economizer, a second vertical flue, a horizontal flue and a denitration device, wherein a low-temperature superheater 2 and an economizer 3 are sequentially arranged in the first vertical flue along the flue gas flowing direction, a static mixer 9 and an ammonia injection grid 10 are sequentially arranged in the second vertical flue along the flue gas flowing direction, a first group of guide plates 8 are arranged at the communication position of the horizontal pipeline at the outlet of the economizer and the first vertical flue, a second group of guide plates 11 are arranged at the communication position of the first vertical flue and the horizontal flue, a third group of guide plates 12 are arranged at the communication position of the horizontal flue and the inlet of the denitration device, a rectifying grid 13 is arranged at the inlet of the denitration device, and a catalyst layer 14 is arranged in the denitration device. One end of a bypass flue 5 is communicated with the steering chamber 1, the other end of the bypass flue 5 is communicated with a horizontal pipeline at the outlet of the economizer, a shutoff door 6 and an adjusting door 7 are arranged on the bypass flue 5, a water inlet pipeline of the economizer is communicated with a water inlet of the economizer 3, a water outlet of the economizer 3 is communicated with a water outlet pipeline of the economizer, one end of a water supply bypass of the economizer is communicated with the water inlet pipeline of the economizer, the other end of the water supply bypass of the economizer is communicated with the water outlet pipeline of the economizer, and a flow adjusting valve 15 is arranged on the water supply bypass of the economizer.
The utility model discloses a concrete working process does:
in the starting process of a power plant: the opening degree of the flow regulating valve 15 is regulated to 100 percent, the heat exchange with the flue gas is reduced as much as possible, and the temperature of the flue gas at the outlet of the economizer 3 is ensured. The opening degree of the shutoff valve 6 is adjusted to 100%, the opening degree of the adjusting valve 7 is adjusted to 100%, the smoke temperature at the inlet of the low-temperature superheater 2 is 300-400 ℃, the smoke temperature of the economizer water supply bypass can be increased by about 15 ℃, the smoke temperature of the bypass flue 5 can be increased by 40-60 ℃, and the smoke temperature in the startup process of the power plant can always meet the requirements of a catalyst and the emission requirements of nitrogen oxides. Along with the process of starting and grid-connection of the power plant, the smoke temperature continues to rise, the smoke temperature at the inlet of the catalyst layer 14 is guaranteed to be about 300 ℃, the flow regulating valve 15 is gradually closed, the regulating valve 7 is gradually closed, and the shutoff valve 6 is closed.
The high-load operation process of the power plant: the regulating valve 7 is completely closed, the shutoff valve 6 is completely closed, and the flow regulating valve 15 is completely closed;
low load operation process of the plant (lowest to 25% load): when the power plant participates in peak shaving, the load is gradually reduced, when the load is reduced to the temperature of the flue gas at the inlet of the catalyst layer 14 and is less than 300 ℃, the load is about 30% at the moment, the shutoff door 6 is opened, the adjusting door 7 is opened, the temperature of the flue gas at the inlet of the catalyst layer 14 is ensured to be 300 ℃, after the adjusting door 7 is completely opened, the temperature of the flue gas at the inlet of the catalyst cannot be ensured, the flow regulating valve 15 is opened, the opening degree of the flow regulating valve 15 is regulated, and when the load of the boiler is stabilized at 25% of the load, the flow regulating valve 15 cannot be regulated any more.
In the shutdown process of a power plant: the opening degree of the flow rate adjusting valve 15 is adjusted to 100%, the opening degree of the shutoff door 6 is adjusted to 100%, and the opening degree of the flow rate adjusting valve 15 is adjusted to 100%.
Claims (8)
1. A full-load denitration system is characterized by comprising a hearth, a first vertical flue, a second vertical flue, a horizontal flue, a denitration device, a steering chamber (1), an economizer outlet horizontal flue (4) and a bypass flue (5);
the outlet of the hearth is communicated with a turning chamber (1), a first vertical flue, a horizontal flue (4) at the outlet of the economizer, a second vertical flue, the horizontal flue and a denitration device, wherein a low-temperature superheater (2) and an economizer (3) are sequentially arranged in the first vertical flue along the smoke flowing direction, a static mixer (9) and an ammonia injection grid (10) are sequentially arranged in the second vertical flue along the smoke flowing direction, a rectifying grid (13) is arranged at the inlet of the denitration device, a catalyst layer (14) is arranged in the denitration device, one end of a bypass flue (5) is communicated with the turning chamber (1), the other end of the bypass flue (5) is communicated with the horizontal pipeline at the outlet of the economizer, a shutoff door (6) and an adjusting door (7) are arranged on the bypass flue (5), a water inlet pipeline of the economizer is communicated with a water inlet of the economizer (3), a water outlet of the economizer (3) is communicated with a water outlet pipeline of the economizer, one end of a bypass of the economizer bypass is communicated with a water inlet pipeline of the economizer, the other end of the economizer bypass is communicated with a water outlet pipeline of the economizer, and a bypass flow adjusting valve (15) is arranged on the economizer.
2. The full-load denitration system according to claim 1, wherein a first group of guide plates (8) are arranged at the position where the horizontal pipeline at the outlet of the coal economizer is communicated with the first vertical flue.
3. The full-load denitration system according to claim 1, wherein a second group of guide plates (11) are arranged at the communication position of the first vertical flue and the horizontal flue.
4. The full-load denitration system according to claim 1, wherein a third group of guide plates (12) is provided at a position where the horizontal flue communicates with the inlet of the denitration device.
5. The full-load denitration system according to claim 1, wherein in the startup process of the power plant, the opening degree of the flow regulating valve (15) is regulated to 100%, the opening degree of the shutoff valve (6) is regulated to 100%, the opening degree of the regulating valve (7) is regulated to 100%, and at the moment, the smoke temperature at the inlet of the low-temperature superheater (2) is 300-400 ℃, and the smoke temperature continues to rise along with the progress of the startup grid-connection process of the power plant, so as to ensure that the smoke temperature at the inlet of the catalyst layer (14) meets the requirement, the flow regulating valve (15) is gradually closed, then the regulating valve (7) is gradually closed, and finally the shutoff valve (6) is gradually closed.
6. A full load denox system according to claim 1, wherein during high load operation of the power plant, the regulating valve (7) is fully closed, the shutoff valve (6) is fully closed, and the flow regulating valve (15) is fully closed.
7. The full-load denitration system of claim 1, wherein during low-load operation of the power plant, when the power plant participates in peak shaving, the load is gradually reduced, when the load is reduced to the temperature of flue gas at the inlet of the catalyst layer (14) is less than 300 ℃, the shutoff door (6) is opened, the regulating door (7) is opened to ensure that the temperature of flue gas at the inlet of the catalyst layer (14) meets the requirement, when the temperature of flue gas at the inlet of the catalyst layer is still not ensured after the regulating door (7) is completely opened, the flow regulating valve (15) is opened to regulate the opening degree of the flow regulating valve (15), wherein when the load of the boiler is stabilized at 25% load, the flow regulating valve (15) is not regulated any more.
8. The full-load denitration system according to claim 1, wherein during a plant shutdown, the opening degree of the flow regulating valve (15) is adjusted to 100%, the opening degree of the shutoff valve (6) is adjusted to 100%, and the opening degree of the flow regulating valve (15) is adjusted to 100%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221588725.3U CN217568207U (en) | 2022-06-23 | 2022-06-23 | Full-load denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221588725.3U CN217568207U (en) | 2022-06-23 | 2022-06-23 | Full-load denitration system |
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| CN217568207U true CN217568207U (en) | 2022-10-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984752A (en) * | 2022-06-23 | 2022-09-02 | 西安西热锅炉环保工程有限公司 | Full-load denitration system and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984752A (en) * | 2022-06-23 | 2022-09-02 | 西安西热锅炉环保工程有限公司 | Full-load denitration system and working method thereof |
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