CN211925808U - Flue afterburning system for realizing full-time operation of denitration system of coal-fired thermal power generating unit - Google Patents
Flue afterburning system for realizing full-time operation of denitration system of coal-fired thermal power generating unit Download PDFInfo
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- CN211925808U CN211925808U CN201922002587.0U CN201922002587U CN211925808U CN 211925808 U CN211925808 U CN 211925808U CN 201922002587 U CN201922002587 U CN 201922002587U CN 211925808 U CN211925808 U CN 211925808U
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model discloses a flue afterburning system of realizing coal-fired thermal power unit deNOx systems full period and commissioning belongs to coal-fired thermal power plant flue gas denitration technical field, aims at solving: the coal fired power plant unit is starting, the overall process of shutting down and the low-load operation, and deNOx Systems (SCR) entry flue gas temperature is less than the denitration and puts into operation temperature, can't put into operation the problem. By the system, the SCR inlet smoke temperature can meet the running requirement of the denitration system in the full running time period of the unit starting process, the low-load running stage and the shutdown process. The system comprises a burner, a combustion chamber and the like, wherein the burner and a matched system thereof are adopted, high-temperature flue gas generated by burning external fuel (gas or liquid and the like) is mixed with cold flue gas in an original flue, so that the temperature of the mixed flue gas is higher than the lower limit of denitration commissioning temperature, and therefore, the denitration can be put into operation in each stage of start-up, low-load operation and shutdown of a unit, and the requirement of unit on all-time environmental protection (NOx) emission is met.
Description
Technical Field
The utility model relates to a flue afterburning system of realizing coal-fired thermal power unit deNOx systems full period and commissioning belongs to coal-fired thermal power plant flue gas denitration technical field.
Background
In order to meet the requirement of NOx emission concentration of the thermal power generating unit, the thermal power generating unit is provided with an SCR denitration device. The normal working temperature range of the catalyst of the denitration device is 300-420 ℃, and the catalyst cannot play the due role when the temperature exceeds the temperature range. When the unit participates in deep peak regulation (low-load operation), the inlet smoke temperature of the denitration system of the unit is usually lower than 300 ℃, so that the normal operation requirement of the denitration system cannot be met, and the environmental protection index cannot reach the standard.
In 2016, 11 months, an environmental monitoring office of the environmental protection department issues an emergency notice, the emission requirement of boiler pollutants is improved, the average value of the data (converted) concentration of the pollutant emission hours in low-load operation of the boiler is required not to exceed the standard, and the emission of the boiler reaches the standard in starting, stopping and operation of each load. And during the starting and stopping processes of the coal-fired unit, the flue gas temperature at the SCR inlet is lower, the load operation is lower, and the denitration commissioning requirement cannot be met. The wide-load denitration technology applied to the current market can only solve the problem of low-load denitration operation of a unit due to limited temperature rise range, and cannot meet the requirement of startup and shutdown denitration operation. Based on the reasons, the development of the technology for meeting the startup and shutdown of the unit and the operation of SCR denitration in each low-load time period is urgent.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve coal fired power plant unit at the overall process of start-up, outage and low-load operation, deNOx Systems (SCR) entry flue gas temperature is less than the denitration and puts into operation temperature, the unable problem that drops into operation, and then provides the flue afterburning system who realizes coal fired thermal power plant unit deNOx systems full period and put into operation once.
The utility model provides a technical scheme that above-mentioned problem adopted is: a flue afterburning system for realizing full-time operation of a denitration system of a coal-fired thermal power generating unit comprises an original flue and a downstream flue, wherein the original flue is communicated with the downstream flue; it is characterized by also comprising a combustor and a combustion chamber; the combustor is fixed on a plugging plate at the tail part of the combustion chamber through a fixing device and a mounting bolt, and the combustion chamber is fixed on the wall surface of the original flue through a fixing rib plate; the combustion chamber comprises a combustion chamber outer sleeve and an inner combustion chamber, the inner combustion chamber is positioned inside the combustion chamber outer sleeve, the length of the combustion chamber outer sleeve is greater than that of the inner combustion chamber, and the combustor is communicated to the inner combustion chamber; the head of the combustion chamber is provided with a flow equalizing plate, the flow equalizing plate is fixed with the outside of the combustion chamber in a sleeved mode, the flow equalizing plate is made of high-temperature-resistant materials, and a plurality of flow equalizing holes are formed in the flow equalizing plate and used for flue gas flow equalization and pressure stabilization in the combustion chamber, so that normal combustion of fuel is guaranteed; the head of the combustion chamber is also provided with a high-temperature-resistant pouring layer, and the high-temperature-resistant pouring layer is positioned on the inner wall of the outer sleeve of the combustion chamber and used for protecting the outer sleeve of the combustion chamber from being directly washed away by the flame root to cause ablation.
Further, the interior combustion chamber adopts high temperature resistant material, and its wall is opened has the several cooling hole, the welding of interior combustion chamber is on the shutoff board of combustion chamber afterbody, the outer wall welding of interior combustion chamber has the several fixed plate along the axial, contained angle between the fixed plate is 120, the clearance that the interior combustion chamber passes through the fixed plate assurance and combustion chamber overcoat is with fixed.
Further, the head part of the burner comprises an outer air sleeve and an inner fuel channel, and an air circulation channel for the operation of the burner is arranged between the outer air sleeve and the inner fuel channel and is used for providing oxygen required by the combustion of fuel; the air circulation channel is internally provided with a rotational flow device which is used for enabling air to have tangential momentum, increasing the mixing of fuel and air, strengthening combustion and improving combustion efficiency; the excess air coefficient of the combustion of the fuel of the combustion engine is 1.15-1.3, and high temperature generated by the combustion of the fuel is mixed with cold smoke in an original flue and then enters a downstream flue.
Furthermore, the tail part of the combustion chamber jacket is communicated with a cold air pipeline, a cold air flow adjusting baffle is installed on the cold air pipeline and used for adjusting the flow of cold air, a part of the cold air entering the gap between the combustion chamber jacket and the inner combustion chamber flows downstream along the gap, and a part of the cold air enters the inner combustion chamber through the fish scale cooling holes, so that the effect of cooling the inner combustion chamber and preventing the inner combustion chamber from being ablated by high-temperature flame is achieved.
Furthermore, the system is provided with a plurality of transverse smoke channels, so that the requirements of smoke temperature improvement and temperature field uniformity are met simultaneously.
Compared with the prior art, the utility model, have following advantage and effect: the system adopts the combustor and a matched system thereof, high-temperature flue gas generated by burning external fuel (gas or liquid and the like) is mixed with cold flue gas in an original flue, so that the temperature of the mixed flue gas is higher than the lower limit of denitration commissioning temperature, and denitration can be put into operation in each stage of start-up, low-load operation and shutdown of a unit, thereby meeting the requirement of unit on all-time environmental protection (NOx) emission.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the system according to the embodiment of the present invention.
Fig. 2 is a sectional view of a combustion chamber in an embodiment of the present invention.
Fig. 3 is a schematic view of the structure of the plane a-a of fig. 2.
Fig. 4 is a schematic view of the structure of the plane B-B of fig. 2.
FIG. 5 is a comparison graph of the SCR inlet smoke temperature change curve when the system is used for heating in the boiler starting stage and the SCR inlet smoke temperature change curve when the original oil is put into the boiler for starting.
In the figure: the device comprises an original flue 1, a downstream flue 2, a combustor 3, a combustion chamber 4, a cold air pipeline 5, a cold air flow adjusting baffle 6, a wall surface 7, a fixed rib plate 8, a high-temperature-resistant pouring layer 9, a flow equalizing plate 10, an inner combustion chamber 11, an outer air sleeve 12, an inner fuel channel 13, a mounting bolt 14, a blocking plate 15, a fixing device 16, a combustion chamber outer sleeve 17, a swirling device 18, a fixing plate 19 and a cooling hole 20.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1 to 4, the flue afterburning system for realizing the full-time operation of the denitration system of the coal-fired thermal power generating unit in the embodiment includes an original flue 1 and a downstream flue 2, wherein the original flue 1 is communicated with the downstream flue 2; the device also comprises a combustor 3 and a combustion chamber 4; the combustor 3 is fixed on a plugging plate 15 at the tail part of the combustion chamber 4 through a fixing device 16 and a mounting bolt 14, and the combustion chamber 4 is fixed on the wall surface 7 of the original flue 1 through a fixing rib plate 8; the combustion chamber 4 comprises a combustion chamber outer sleeve 17 and an inner combustion chamber 11, the inner combustion chamber 11 is positioned inside the combustion chamber outer sleeve 17, the length of the combustion chamber outer sleeve 17 is greater than that of the inner combustion chamber 11, and the combustion engine 3 is communicated to the inner combustion chamber 11; the head of the combustion chamber 4 is provided with a flow equalizing plate 10, the flow equalizing plate 10 is fixed with a combustion chamber jacket 17, the flow equalizing plate 10 is made of high-temperature-resistant materials, and a plurality of flow equalizing holes are formed in the flow equalizing plate 10 and used for flue gas flow equalization and pressure stabilization in the combustion chamber 4, so that the normal combustion of fuel is ensured; the head of the combustion chamber 4 is also provided with a high-temperature-resistant pouring layer 9, and the high-temperature-resistant pouring layer 9 is positioned on the inner wall of the combustion chamber outer sleeve 17 and used for protecting the combustion chamber outer sleeve 17 from being directly washed away by the flame root to cause ablation.
The inner combustion chamber 11 is made of high-temperature-resistant materials, the wall surface of the inner combustion chamber is provided with a plurality of fish scale-shaped cooling holes 20, the inner combustion chamber 11 is welded on the blocking plate 15 at the tail part of the combustion chamber 4, the outer wall surface of the inner combustion chamber 11 is axially welded with a plurality of fixing plates 19, the included angle between the fixing plates 19 is 120 degrees, and the inner combustion chamber 11 is ensured to be in clearance and fixed with the combustion chamber outer sleeve 17 through the fixing plates 19.
The head of the combustor 3 comprises an outer air sleeve 12 and an inner fuel channel 13, and an air circulation channel for the operation of the combustor 3 is arranged between the outer air sleeve 12 and the inner fuel channel 13 and is used for providing oxygen required by fuel combustion; a rotational flow device 18 is also arranged in the air circulation channel and is used for enabling air to have tangential momentum, increasing the mixing of fuel and air, strengthening combustion and improving combustion efficiency; the excess air coefficient of the combustion of the fuel of the combustor 3 is 1.15-1.3, and the high temperature generated by the combustion of the fuel is mixed with cold flue gas in the original flue 1 and then enters the downstream flue 2.
The tail part of the combustion chamber jacket 17 is communicated with a cold air pipeline 5, a cold air flow adjusting baffle 6 is installed on the cold air pipeline 5 and used for adjusting the flow of cold air, part of the cold air entering the gap between the combustion chamber jacket 17 and the inner combustion chamber 11 flows downstream along the gap, and part of the cold air enters the inner combustion chamber 11 through the fish scale cooling holes 20 to play a role in cooling the inner combustion chamber 11 and preventing the inner combustion chamber from being ablated by high-temperature flame.
The system is provided with a plurality of original smoke channels 1 in a transverse arrangement mode so as to meet the requirements of smoke temperature improvement and temperature field uniformity at the same time.
The working method comprises the following steps: in the starting stage of the unit, when the boiler starts to feed powder, the system is put into operation, the combustor 3 burns fuel to generate high-temperature flue gas, the high-temperature flue gas and cold flue gas in the original flue 1 are mixed and enter the downstream flue 2, the temperature of the mixed flue gas is higher than the lower limit of the denitration feeding temperature, the denitration feeding temperature requirement is met, and the denitration feeding operation is carried out; along with the unit starts, the temperature of smoke in the original flue 1 is gradually increased, then the operation power and the number of the burners 3 in the system are correspondingly reduced, and the system is completely withdrawn until the temperature of the smoke at the SCR inlet of the boiler meets the denitration operation requirement. The operation mode of the system is similar in other load sections of the unit.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (5)
1. A flue afterburning system for realizing full-time operation of a denitration system of a coal-fired thermal power generating unit comprises an original flue (1) and a downstream flue (2), wherein the original flue (1) is communicated with the downstream flue (2); the device is characterized by also comprising a combustor (3) and a combustion chamber (4); the combustor (3) is fixed on a plugging plate (15) at the tail part of the combustion chamber (4) through a fixing device (16) and a mounting bolt (14), and the combustion chamber (4) is fixed on a wall surface (7) of the original flue (1) through a fixing rib plate (8); the combustion chamber (4) comprises a combustion chamber outer sleeve (17) and an inner combustion chamber (11), the inner combustion chamber (11) is positioned inside the combustion chamber outer sleeve (17), the length of the combustion chamber outer sleeve (17) is larger than that of the inner combustion chamber (11), and the combustion engine (3) is communicated to the inner combustion chamber (11); the head of the combustion chamber (4) is provided with a flow equalizing plate (10), the flow equalizing plate (10) is fixed with a combustion chamber outer sleeve (17), the flow equalizing plate (10) is made of high-temperature-resistant materials, and a plurality of flow equalizing holes are formed in the flow equalizing plate (10) and used for flue gas flow equalization and pressure stabilization in the combustion chamber (4) to ensure normal combustion of fuel; the head of the combustion chamber (4) is also provided with a high-temperature-resistant pouring layer (9), and the high-temperature-resistant pouring layer (9) is located on the inner wall of the combustion chamber outer sleeve (17) and used for protecting the combustion chamber outer sleeve (17) from being directly washed away by flame roots to cause ablation.
2. The flue afterburning system for realizing full-time operation of the denitration system of the coal-fired thermal power generating unit as claimed in claim 1, wherein the inner combustion chamber (11) is made of high-temperature-resistant materials, the wall surface of the inner combustion chamber is provided with a plurality of cooling holes (20), the inner combustion chamber (11) is welded on a blocking plate (15) at the tail part of the combustion chamber (4), the outer wall surface of the inner combustion chamber (11) is axially welded with a plurality of fixing plates (19), the included angle between the fixing plates (19) is 120 degrees, and the inner combustion chamber (11) is ensured to be in clearance and fixed with a combustion chamber outer sleeve (17) through the fixing plates (19).
3. The flue afterburning system for realizing the full-time operation of the denitration system of the coal-fired thermal power generating unit as claimed in claim 1, wherein the head part of the burner (3) comprises an outer air sleeve (12) and an inner fuel channel (13), and an air circulation channel for the operation of the burner (3) is arranged between the outer air sleeve (12) and the inner fuel channel (13) and is used for providing oxygen required by fuel combustion; and a rotational flow device (18) is also arranged in the air circulation channel and is used for enabling air to have tangential momentum, increasing the mixing of fuel and air, strengthening combustion and improving combustion efficiency.
4. The flue afterburning system for realizing the full-time operation of the denitration system of the coal-fired thermal power generating unit as claimed in claim 1, wherein the tail part of the combustion chamber outer sleeve (17) is communicated with a cold air pipeline (5), and the cold air pipeline (5) is provided with a cold air flow adjusting baffle (6) for adjusting the cold air flow.
5. The flue afterburning system for realizing the full-time operation of the denitration system of the coal-fired thermal power generating unit as claimed in claim 1, wherein a plurality of original flues (1) are transversely arranged in the system so as to meet the requirements of flue gas temperature increase and temperature field uniformity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922002587.0U CN211925808U (en) | 2019-11-19 | 2019-11-19 | Flue afterburning system for realizing full-time operation of denitration system of coal-fired thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922002587.0U CN211925808U (en) | 2019-11-19 | 2019-11-19 | Flue afterburning system for realizing full-time operation of denitration system of coal-fired thermal power generating unit |
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| CN211925808U true CN211925808U (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076205A (en) * | 2019-11-19 | 2020-04-28 | 华电电力科学研究院有限公司 | Flue afterburning system and method for realizing full-time operation of denitration system of coal-fired thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076205A (en) * | 2019-11-19 | 2020-04-28 | 华电电力科学研究院有限公司 | Flue afterburning system and method for realizing full-time operation of denitration system of coal-fired thermal power generating unit |
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