A system for improving deaerator performance

Abstract

The present invention discloses a system for improving the performance of a deaerator, including a fan, an air duct, a boiler, a connecting pipeline, an elbow, a tee, a solenoid valve, a venturi ejector, a deaerator and an exhaust recovery system, a flashback preventer, an oxygen storage tank, a secondary air chamber and a secondary air duct; wherein the deaerator and the exhaust recovery system include a deaerator body, an ejector exhaust pipeline and a gas-water separation device, and the air duct includes a diversion port and a mixed flow port. The various pipelines together constitute a main system for ejecting non-condensable gases in the deaerator using hot secondary air. The hot secondary air ejects the non-condensable gases in the exhaust gas of the deaerator through the venturi ejector, and the ejected air and the remaining secondary air after the mixture of the two are combined as a secondary air source. Compared with conventional deaerators and exhaust recovery systems, the removal effect of non-condensable gases is improved, the oxygen content of the hot desalted water transported by the gas-liquid separation device to the deaerator body is reduced, and the comprehensive deoxygenation effect of the deaerator and the exhaust recovery system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of deaerators, and in particular to a system for improving the performance of a deaerator. Background Art

[0002] Dissolved oxygen in the feed water is the main cause of corrosion of thermal equipment. The oxygen content in natural water at normal temperature (20℃) and normal pressure (0.1MPa) is about 8mg / L. When the dissolved oxygen content in the condensate exceeds 0.03mg / L, pitting corrosion will occur in the feed water pipeline in a short period of time. At the same time, the accumulation of non-condensable gases in the heat exchange equipment will lead to deterioration of heat transfer. The dissolved oxygen in the condensate will seriously threaten the safe and economical operation of the unit.

[0003] Conventional deaerators use steam to heat the water inlet to the saturation temperature to remove non-condensable gases such as oxygen and carbon dioxide from the water. Part of the heated steam and the removed non-condensable gases are introduced into the condenser or discharged into the atmosphere. If introduced into the condenser, the deoxidation effect is affected by the condenser vacuum; if discharged into the atmosphere, a large amount of steam heat will be wasted. Therefore, a system to improve the performance of deaerators has become the focus of research in this field. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a system for improving the performance of a deaerator, improving the deoxidation effect of the deaerator, strengthening heat exchange and preventing corrosion of heat exchange equipment and pipelines.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0006] A system for improving the performance of a deaerator, comprising a secondary fan 1, an air duct 2, a boiler 3, a connecting pipeline a4, a solenoid valve a5, a connecting pipeline b6, an elbow a7, a connecting pipeline c8, an elbow b9, a connecting pipeline d10, a tee a11, a solenoid valve b12, a connecting pipeline e13, a tee b14, an elbow c15, a venturi ejector a16, a solenoid valve c17, an elbow d18, a solenoid valve d19, a deaerator and an exhaust gas recovery system 20. Connecting pipeline f21, elbow e22, venturi ejector b23, elbow f24, backfire preventer 25, connecting pipeline g26, solenoid valve e27, oxygen storage tank 28, connecting pipeline h29, solenoid valve f30, connecting pipeline i31, elbow g32, connecting pipeline j33, elbow h34, connecting pipeline k35, secondary air box 36, secondary air duct a37, secondary air duct b38 and secondary air duct c39. The secondary fan 1, the air duct 2, the connecting pipeline a4, the solenoid valve a5, the connecting pipeline b6, the elbow a7, the connecting pipeline c8, the elbow b9, the connecting pipeline d10, the tee a11, the solenoid valve b12, the connecting pipeline e13, the tee b14, the connecting pipeline f21, the elbow e22, the venturi ejector b23, the connecting pipeline h29, the solenoid valve f30, the connecting pipeline i31, the elbow g32, the connecting pipeline j33, the elbow h34, and the connecting pipeline k35 are connected in sequence to form an ejection air channel; the secondary fan 1, the air duct 2, the secondary wind box 36 and the boiler 3 are connected in sequence to form an air supply channel. The lower port of the tee a11, elbow c15, venturi ejector a16, solenoid valve c17, elbow d18 and the lower port of the tee b14 are connected in sequence to form the main part of the non-condensable gas branch pipeline in the secondary air ejection deaerator; the ejection port of the venturi ejector a16, solenoid valve d19 and the deaerator and exhaust gas recovery system 20 are connected in sequence to form the auxiliary part of the non-condensable gas branch pipeline in the secondary air ejection deaerator, and the two together form the non-condensable gas branch pipeline in the secondary air ejection deaerator. The ejection port of the venturi ejector b23, elbow f24, flashback preventer 25, connecting pipeline g26, solenoid valve e27 and oxygen storage tank 28 are connected in sequence to form the pipeline of oxygen in the secondary air ejection oxygen storage tank 28.

[0007] The air duct 2 is a rectangular cross-section air duct, comprising a circular diversion port 201 and a mixed flow inlet 202, wherein the diversion port 201 is the inlet for diverting part of the secondary air heated by the air preheater to the induced air channel, and the mixed flow inlet 202 is the inlet for the mixed air flow in the induced air channel to enter the end of the air duct 2 and mix with the secondary air.

[0008] The venturi ejector a16 is a venturi ejector with a circular cross-section. The tapered conical inlet on the left side in the horizontal direction is the tapered section of the venturi ejector a16, the middle cylindrical through hole is the throat of the venturi ejector a16, the gradually expanding conical outlet on the right side is the gradually expanding section of the venturi ejector a16, and the vertical pipe section is the ejection section of the venturi ejector a16.

[0009] The venturi ejector b23 is a venturi ejector with a circular cross-section. The right side tapered conical inlet in the horizontal direction is the tapered section of the venturi ejector b23, the middle cylindrical through hole is the throat of the venturi ejector b23, the left side gradually expanding conical outlet is the gradually expanding section of the venturi ejector b23, and the vertical pipe section is the ejection section of the venturi ejector b23.

[0010] The deaerator and exhaust gas recovery system 20 includes a deaerator body 2001, an ejector exhaust pipe 2002 and an air-water separation device 2003. The top exhaust port of the deaerator body 2001 is connected to the ejector exhaust pipe 2002 and the air-water separation device 2003, and the exhaust gas is mixed with the desalted water in the ejector exhaust pipe 2002 to form a gas-liquid mixture of hot desalted water and non-condensable gas and enters the air-water separation device 2003. In the air-water separation device 2003, the hot desalted water occupies the lower space and finally circulates to the deaerator, and the non-condensable gas occupies the upper space and is connected to the ejector pipe of the Venturi ejector a16 through the solenoid valve d19.

[0011] The oxygen storage tank 28 is a cylindrical storage tank, which stores high-concentration oxygen. The circular connecting pipe on the left connects the interior of the oxygen storage tank 28.

[0012] The cross section of the secondary air box 36 is a rectangular parallelepiped air box, and the circular connecting pipe on the right side is the air outlet of the secondary air box 36. From top to bottom, they are the secondary air duct a37, the secondary air duct b38 and the secondary air duct c39.

[0013] The inlet of the venturi ejector a16 is connected to the hot secondary air, and the ejection port of the venturi ejector a16 is connected to the deaerator and the exhaust gas recovery system 20. After the hot secondary air is accelerated and depressurized through the tapered section of the venturi ejector a16, the non-condensable gas in the deaerator and the exhaust gas recovery system 20 is ejected at the throat. The mixed gas of the hot secondary air and the non-condensable gas is fully mixed in the tapered section of the venturi ejector a16 and then discharged from the outlet of the venturi ejector a16.

[0014] The inlet of the venturi ejector b23 is connected to the hot secondary air, and the ejection port is connected to the oxygen in the oxygen storage tank 28. After the hot secondary air is accelerated and depressurized through the tapering section of the venturi ejector b23, the oxygen in the oxygen storage tank 28 is ejected at the throat. The hot secondary air and oxygen are fully mixed in the expanding section of the venturi ejector b23 and then discharged from the outlet of the venturi ejector b23.

[0015] The upper end of the connecting pipeline k35 is connected to the mixed flow inlet 202 of the air duct 2. The induced air and the secondary air are mixed and flow from the secondary air outlet of the air duct 2 to the secondary air box 36 as the secondary air source for combustion in the furnace.

[0016] The beneficial effects of the present invention are:

[0017] The present invention discloses a system for improving the performance of a deaerator. The system utilizes hot secondary air to eject non-condensable gases in the deaerator and the exhaust gas recovery system through a venturi ejector. Compared with conventional deaerators and exhaust gas recovery systems, the removal effect of non-condensable gases is significantly improved, and the deoxygenation effect of the deaerator is effectively improved. The system adopts a method of partially ejecting non-condensable gases with secondary air, has no other additional power sources, and has low deoxygenation energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A front view system diagram of a system for improving deaerator performance according to the present invention;

[0019] Figure 2 A first axial system diagram of a system for improving deaerator performance according to the present invention;

[0020] Figure 3 A rear view system diagram of a system for improving deaerator performance according to the present invention;

[0021] Figure 4 A second axial system diagram of a system for improving deaerator performance according to the present invention;

[0022] Figure 5 A first isometric view of an air duct of a system for improving deaerator performance according to the present invention;

[0023] Figure 6 A second isometric view of an air duct of a system for improving deaerator performance according to the present invention;

[0024] Figure 7 A three-dimensional view of a venturi ejector a of a system for improving deaerator performance according to the present invention;

[0025] Figure 8 A three-dimensional view of a venturi ejector b of a system for improving deaerator performance according to the present invention;

[0026] Fig. 9 A three-dimensional view of a deaerator and an exhaust gas recovery system of a system for improving deaerator performance according to the present invention;

[0027] Fig.10 A three-dimensional view of an oxygen storage tank of a system for improving deaerator performance according to the present invention;

[0028] Fig.11 A three-dimensional view of a secondary air box of a system for improving deaerator performance according to the present invention;

[0029] Fig.12 A three-dimensional view of a tee a of a system for improving deaerator performance according to the present invention;

[0030] Fig.13It is a three-dimensional view of a tee b of a system for improving the performance of a deaerator according to the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] The present invention is a system for improving the performance of a deaerator, comprising a secondary fan 1, an air duct 2, a boiler 3, a connecting pipeline a4, a solenoid valve a5, a connecting pipeline b6, an elbow a7, a connecting pipeline c8, an elbow b9, a connecting pipeline d10, a tee a11, a solenoid valve b12, a connecting pipeline e13, a tee b14, an elbow c15, a venturi ejector a16, a solenoid valve c17, an elbow d18, a solenoid valve d19, a deaerator and an exhaust gas recovery device. System 20, connecting pipeline f21, elbow e22, venturi ejector b23, elbow f24, flashback arrester 25, connecting pipeline g26, solenoid valve e27, oxygen storage tank 28, connecting pipeline h29, solenoid valve f30, connecting pipeline i31, elbow g32, connecting pipeline j33, elbow h34, connecting pipeline k35, secondary air box 36, secondary air duct a37, secondary air duct b38 and secondary air duct c39. The air duct 2 includes a circular diverter port 201 and a mixed flow inlet 202. The deaerator and exhaust gas recovery system 20 includes a deaerator body 2001, an ejector exhaust pipeline 2002 and a gas-water separation device 2003.

[0033] As a preferred embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 and Figure 4It can be obtained that the secondary fan 1, the air duct 2 and the boiler 3 are connected in sequence to form an air supply channel; the secondary fan 1, the air duct 2, the connecting pipe a4, the solenoid valve a5, the connecting pipe b6, the elbow a7, the connecting pipe c8, the elbow b9, the connecting pipe d10, the tee a11, the solenoid valve b12, the connecting pipe e13, the tee b14, the connecting pipe f21, the elbow e22, the venturi ejector b23, the connecting pipe h29, the solenoid valve f30, the connecting pipe i31, the elbow g32, the connecting pipe j33, the elbow h34 and the connecting pipe k35 are connected in sequence to form an ejection air channel. The lower port of the tee a11, the elbow c15, the venturi ejector a16, the solenoid valve c17, the elbow d18 and the lower port of the tee b14 are connected in sequence to form the main part of the non-condensable gas branch pipeline in the secondary air ejector deaerator; the lower port of the venturi ejector a16, the solenoid valve d19 and the gas-water separation device 20 in the deaerator and the exhaust gas recovery system 20 are connected in sequence to form the auxiliary part of the non-condensable gas branch pipeline in the secondary air ejector deaerator, and the two together constitute the non-condensable gas branch pipeline in the secondary air ejector deaerator. The lower port of the venturi ejector b23, the elbow f24, the flashback preventer 25, the connecting pipeline g26, the electromagnetic valve e27 and the oxygen storage tank 28 are connected in sequence to form a branch pipeline for secondary air ejection of oxygen; the upper port of the connecting pipeline k35 is connected to the mixed flow inlet 202 of the air duct 2, and the ejected air is mixed with the secondary air in the air duct 2 and flows from the secondary air outlet of the air duct 2 to the secondary air box 36. The above-mentioned pipelines together constitute the main system for using hot secondary air to eject non-condensable gas in the deaerator to improve the deoxidation effect.

[0034] like Figure 5 and Figure 6 As shown, the air duct 2 is a rectangular cross-section air duct, comprising a circular diverter port 201 and a mixed flow inlet 202, wherein the diverter port 201 is the inlet for the secondary air heated by the air preheater to be diverted to the induced air duct, and the mixed flow inlet 202 is the inlet for the mixed air flow of the induced air duct to enter the end of the air duct 2 and mix with the secondary air, refer to Figure 5 The wireframe arrow at the bottom of the air duct 2 is the inlet for the secondary fan 1 to deliver air. The cold secondary air is heated into hot secondary air by the air preheater along the direction of the wireframe arrow. Part of the hot secondary air is diverted to the induced air channel at the diversion port 201, and the remaining hot secondary air continues to be transported to the far end along the air duct, and is finally sent to the far left, and is diverted into primary air directly downward (direction refers to the vertically downward wireframe arrow on the far left) and secondary air to the left (direction refers to the leftward wireframe arrow on the far left). This part of the secondary air is mixed with the induced air of the induced air channel at the mixed flow inlet 202 of the air duct 2 and then enters the secondary air box 36 as a secondary air source.

[0035] like Figure 7As shown, the venturi ejector a16 is a venturi ejector with a circular cross-section. In the horizontal direction, the left port close to the small wireframe arrow is the inlet of the venturi ejector a16, the truncated cone-shaped contraction section is the tapered section of the venturi ejector a16, the middle cylindrical through hole is the throat of the venturi ejector a16, the right truncated cone-shaped expansion section is the tapered section of the venturi ejector a16, and the right port close to the large wireframe arrow is the outlet of the venturi ejector a16; in the vertical direction, the lower port of the vertical pipe section close to the small wireframe arrow is the ejection port of the venturi ejector a16, and the vertical pipe section is the ejection section of the venturi ejector a16.

[0036] like Figure 8 As shown, the venturi ejector b23 is a venturi ejector with a circular cross-section. In the horizontal direction, the right port close to the small wireframe arrow is the inlet of the venturi ejector b23, the truncated cone-shaped contraction section is the tapered section of the venturi ejector b23, the middle cylindrical through hole is the throat of the venturi ejector b23, the left truncated cone-shaped expansion section is the tapered section of the venturi ejector b23, and the left port close to the large wireframe arrow is the outlet of the venturi ejector b23; in the vertical direction, the lower port of the vertical pipe section close to the small wireframe arrow is the ejection port of the venturi ejector b23, and the vertical pipe section is the ejection section of the venturi ejector b23.

[0037] like Fig. 9 As shown, the deaerator and exhaust gas recovery system 20 includes a deaerator body 2001, an ejector exhaust pipe 2002 and a gas-water separation device 2003. The deaerator body 2001 is a conventional power station deaerator. The ejector exhaust pipe 2002 is a pipe connecting the top exhaust valve of the deaerator body 2001 and the gas-water separation device 2003. The gas-water separation device 2003 is a rectangular header for separating non-condensable gases and hot water, and is connected to the ejector pipe of the venturi ejector a16 through the solenoid valve d19 to transport the non-condensable gases in the deaerator exhaust to the ejector air pipe.

[0038] like Fig.10 As shown, the oxygen storage tank 28 is a cylindrical storage tank, which stores high-concentration oxygen inside, which can be prepared and stored by membrane separation, water electrolysis and other methods; the circular connecting pipe on the left connects the inside of the oxygen storage tank 28 with the outside world and is the outlet of the oxygen storage tank 28.

[0039] like Fig.11 As shown, the secondary air box 36 is a rectangular parallelepiped air box, and the circular connecting pipe on the right side is the air outlet of the secondary air box 36. From top to bottom, they are the secondary air duct a37, the secondary air duct b38 and the secondary air duct c39.

[0040] like Fig.12As shown, the port of the tee a11 close to the small wireframe arrow on the left is the left port, the port close to the small wireframe arrow below is the lower port, and the port close to the large wireframe arrow on the right is the right port.

[0041] like Fig.13 As shown, the port of the tee b14 close to the small wireframe arrow on the left is the left port, the port close to the small wireframe arrow below is the lower port, and the port close to the large wireframe arrow on the right is the right port.

[0042] Combined with the above system, refer to Figure 4A system for improving the performance of a deaerator is specifically as follows: a secondary fan 1 transports part of the hot secondary air at the outlet of an air preheater from an air duct 2 to a wind box as a gas source for coal powder combustion in a boiler 3, and the remaining part of the hot secondary air is transported from a side opening of the air duct 2 to an induced air channel. At this time, the hot secondary air flows to the secondary wind box 36 in two ways: 1. Inducing the non-condensable gases in the exhaust of a deaerator and an exhaust recovery system 20 alone; 2. Inducing the non-condensable gases and oxygen in the exhaust of a deaerator and an exhaust recovery system 20 at the same time. The selection of these two methods depends on the specific working conditions. When the deaerator works normally, the hot secondary air is used to separately inject the non-condensable gas in the exhaust gas of the deaerator and the exhaust gas recovery system 20 to improve the deoxygenation effect (solenoid valve a5, solenoid valve b12, solenoid valve c17, solenoid valve d19 and solenoid valve f30 are all opened, and the solenoid valve e27 is closed). The hot secondary air flows through the connecting pipe a4, solenoid valve a5, connecting pipe b6, elbow a7, connecting pipe c8, elbow b9, connecting pipe d10, and the left port of the tee a11 in sequence. From then on, the hot secondary air is split. Part of the hot secondary air flows through the lower port of the tee a11 and the elbow c15 to the Venturi ejector a16 to inject the non-condensable gas in the exhaust gas of the deaerator and the exhaust gas recovery system 20, and continues to flow through the solenoid valve c17 and the elbow d18 and then enters the lower port of the tee b14. The other part of the hot secondary air flows through the right port of the tee a11, Solenoid valve b12 and connecting pipe e13 flow to the left port of tee b14, and the two hot secondary airs are remixed. After the mixed flow, the hot secondary air continues to flow through connecting pipe f21, elbow e22, venturi ejector b23, connecting pipe h29, solenoid valve f30, connecting pipe i31, elbow g32, connecting pipe j33, elbow h34, connecting pipe k35 to the mixed flow inlet 202 of air duct 2. The ejected air after the non-condensable gas in the deaerator and the hot secondary air mixes with the secondary air at the tail of air duct 2 and flows to the secondary air box 36, and finally enters the furnace from the secondary air duct a37, secondary air duct b38 and secondary air duct c39, as the secondary air source of the burner. In this way, the non-condensable gas in the deaerator can be effectively absorbed, the oxygen content of the hot desalted water recovered by the deaerator can be reduced, and the comprehensive deoxygenation effect of the deaerator can be improved.In order to effectively absorb the non-condensable gas in the deaerator while ensuring a high oxygen content in the secondary air, that is, to achieve oxygen-rich combustion, a backup plan should be adopted at this time - the non-condensable gas in the exhaust of the deaerator and the exhaust recovery system 20 and the oxygen in the oxygen storage tank 28 are simultaneously injected (solenoid valve a5, solenoid valve b12, solenoid valve c17, solenoid valve d19, solenoid valve e27 and solenoid valve f30 are all opened), and the hot secondary air flows through the connecting pipe a4, solenoid valve a5, connecting pipe b6, elbow a7, connecting pipe c8, elbow b9, connecting pipe d10, and the left port of tee a11. From then on, the hot secondary air is split. Part of the hot secondary air flows through the lower port of tee a11 and elbow c15 to the venturi ejector a16 to eject the non-condensable gas in the deaerator and exhaust recovery system 20, and continues to flow through the solenoid valve c17 and elbow d18 before entering the lower port of tee b14; the other part of the hot secondary air flows through the right port of tee a11, solenoid valve b12, and connecting pipe e13 to the left port of tee b14. At this point, the two hot secondary air are remixed and mixed into the hot secondary air. The wind continues to flow through the connecting pipe f21, elbow e22 to the venturi ejector b23 to eject oxygen or oxygen-rich gas from the oxygen storage tank 28, solenoid valve e27, connecting pipe g26, backfire preventer 25, and elbow f24 in sequence. The high oxygen concentration mixed gas after the hot secondary air is ejected and mixed with oxygen continues to flow through the connecting pipe h29, solenoid valve f30, connecting pipe i31, elbow g32, connecting pipe j33, elbow h34, connecting pipe k35 to the mixed flow inlet 202 of the air duct 2. The non-condensable gas in the deaerator After the hot secondary air and the induced air mixed with oxygen enter the air duct 2, it mixes with the secondary air at the tail of the air duct 2 and flows to the secondary air box 36, and finally enters the furnace from the secondary air duct a37, the secondary air duct b38 and the secondary air duct c39, as the secondary air source of the burner. In this way, the oxygen content of the secondary air is increased while effectively absorbing the non-condensable gas in the deaerator, reducing the oxygen content of the hot desalted water recovered by the deaerator, and improving the comprehensive deoxidation effect of the deaerator, providing an implementation plan for oxygen-enriched combustion under variable load conditions. ;

[0043] The working principles of the Venturi ejector a16 and the Venturi ejector b23 are the same, that is, the incoming hot secondary air flows in from the inlet of the Venturi ejector, and the pressure is accelerated to drop through the tapered section of the Venturi ejector, forming a low-pressure area at the throat of the Venturi ejector. The non-condensable gas in the exhaust gas of the deaerator and the exhaust recovery system 20 or the oxygen in the oxygen storage tank 28 is ejected from the ejector port by utilizing the internal and external pressure difference. The ejected air formed after mixing continues to flow through the tapered section of the Venturi ejector and then flows out from its outlet, thereby achieving sufficient mixing of the hot secondary air with the non-condensable gas in the deaerator and the exhaust recovery system 20 or the oxygen in the oxygen storage tank 28.

[0044] The working principle of the deaerator and exhaust gas recovery system 20 is as follows: the deaerator body 2001 is a conventional power station deaerator, and the jet mixing heating nozzle built into the exhaust gas pipeline 2002 uses the principle of accelerating the pressure reduction of deionized water through the nozzle throat to form a low pressure at the nozzle throat and inhale the steam exhaust steam discharged from the deaerator, so that the exhaust steam is mixed with water to form hot water, and then enters the gas-water separation device 2003. At this time, the non-condensable gas and the hot water are layered up and down in the gas-water separation device 2003, and the hot water circulates back to the deaerator body 2001. The top of the gas-water separation device 2003 is connected to the ejection pipe of the venturi ejector a16 through the solenoid valve d19. The hot secondary air of the venturi ejector a16 uses the venturi effect to eject the non-condensable gas on the upper layer of the gas-water separation device 2003, thereby realizing the effective removal of the non-condensable gas in the deaerator and the exhaust gas recovery system 20, and at the same time greatly reducing the oxygen content of the hot water recovered to the deaerator body 2001.

[0045] In summary, the present invention utilizes hot secondary air to eject non-condensable gases in the deaerator and the exhaust recovery system through a venturi ejector, which significantly improves the removal effect of non-condensable gases compared to conventional deaerators and exhaust recovery systems, greatly reduces the oxygen content of the hot desalted water transported by the gas-liquid separation device to the deaerator body, and effectively improves the comprehensive deoxygenation effect of the deaerator and the exhaust recovery system. At the same time, the diverted secondary air is used to eject non-condensable gases, and there is no other additional power source, thereby saving deoxygenation energy consumption.

Claims

1. A system for improving deaerator performance, characterized in that: The invention comprises a secondary fan (1), an air duct (2), a boiler (3), a connecting pipe a (4), a solenoid valve a (5), a connecting pipe b (6), an elbow a (7), a connecting pipe c (8), an elbow b (9), a connecting pipe d (10), a tee a (11), a solenoid valve b (12), a connecting pipe e (13), a tee b (14), an elbow c (15), a venturi ejector a (16), a solenoid valve c (17), an elbow d (18), a solenoid valve d (19), a deaerator and an exhaust gas recovery system (20), a connecting pipe f (21), an elbow e (22), a venturi ejector b (23), an elbow f (24), a flashback preventer (25), a connecting pipe g (26), a solenoid valve e (27), an oxygen storage tank ( 28), connecting pipe h (29), solenoid valve f (30), connecting pipe i (31), elbow g (32), connecting pipe j (33), elbow h (34), connecting pipe k (35), secondary air box (36), secondary air duct a (37), secondary air duct b (38) and secondary air duct c (39); secondary fan (1), air duct (2), connecting pipe a (4), solenoid valve a (5), connecting pipe b (6), elbow a (7), connecting pipe c (8), elbow b (9), connecting pipe d (10), tee a (11), solenoid valve b (12), connecting pipe e (13), tee b (14), connecting pipe f (21), elbow e (22), venturi ejector b (23), connecting pipe The connecting pipe h (29), the electromagnetic valve f (30), the connecting pipe i (31), the elbow g (32), the connecting pipe j (33), the elbow h (34), and the connecting pipe k (35) are connected in sequence to form an ejection air channel; the secondary fan (1), the air duct (2), the secondary air box (36) and the boiler (3) are connected in sequence to form an air supply channel; the lower port of the tee a (11), the elbow c (15), the venturi ejector a (16), the electromagnetic valve c (17), the elbow d (18) and the lower port of the tee b (14) are connected in sequence to form the main part of the non-condensable gas branch pipe in the secondary air ejector deaerator; the ejection port of the venturi ejector a (16), the electromagnetic valve d (19) and the deaerator and exhaust gas recovery system (20) are connected in sequence to form a secondary air ejector deaerator. The auxiliary part of the non-condensable gas branch pipeline in the secondary air ejector deaerator, the two together constitute the channel for the non-condensable gas in the secondary air ejector deaerator; the ejection port of the venturi ejector b (23), the elbow f (24), the backfire preventer (25), the connecting pipeline g (26), the solenoid valve e (27) and the oxygen storage tank (28) are connected in sequence to form the channel for the secondary air ejector oxygen storage tank (28); the air duct (2) is a rectangular cross-section air duct, comprising a circular diverter port (201) and a mixed flow inlet (202), wherein the diverter port (201) is the inlet for diverting part of the secondary air heated by the air preheater to the ejector air channel, and the mixed flow inlet (202) is the inlet for the mixed air flow of the ejector air channel to enter the end of the air duct (2) and mix with the mainstream secondary air;The cross section of the secondary air box (36) is a rectangular parallelepiped air box, and the circular connecting pipe on the right side is the air outlet of the secondary air box (36). From top to bottom, they are the secondary air duct a (37), the secondary air duct b (38) and the secondary air duct c (39).

2. A system for improving deaerator performance according to claim 1, characterized in that: The venturi ejector a (16) is a venturi ejector with a circular cross-section. The tapered cone inlet on the left side in the horizontal direction is the tapered section of the venturi ejector a (16), the middle cylindrical through hole is the throat of the venturi ejector a (16), the gradually expanding cone outlet on the right side is the gradually expanding section of the venturi ejector a (16), and the vertical pipe section is the ejection section of the venturi ejector a (16).

3. A system for improving deaerator performance according to claim 1, characterized in that: The venturi ejector b (23) is a venturi ejector with a circular cross-section. The right side tapered cone inlet in the horizontal direction is the tapered section of the venturi ejector b (23), the middle cylindrical through hole is the throat of the venturi ejector b (23), the left side gradually expanding cone outlet is the gradually expanding section of the venturi ejector b (23), and the vertical pipe section is the ejection section of the venturi ejector b (23).

4. A system for improving deaerator performance according to claim 1, characterized in that: The deaerator and exhaust gas recovery system (20) comprises a deaerator body (2001), an ejector exhaust pipeline (2002) and a gas-water separation device (2003); the exhaust port at the top of the deaerator body (2001) is connected to the ejector exhaust pipeline (2002) and the gas-water separation device (2003); the exhaust gas is mixed with the desalted water in the ejector exhaust pipeline (2002) to form a gas-liquid mixture of hot desalted water and non-condensable gas, which enters the gas-water separation device (2003); in the gas-water separation device (2003), the hot desalted water occupies the lower space and finally circulates to the deaerator; the non-condensable gas occupies the upper space and is connected to the ejector pipe of the Venturi ejector a (16) through the solenoid valve d (19).

5. A system for improving deaerator performance according to claim 1, characterized in that: The oxygen storage tank (28) is a cylindrical storage tank, which stores high-concentration oxygen inside, and the left circular connecting pipe is connected to the oxygen storage tank (28).

6. A system for improving deaerator performance according to claim 1, characterized in that: The inlet of the venturi ejector a (16) is connected to the incoming hot secondary air, and the ejection port is connected to the non-condensable gas in the deaerator and the exhaust gas recovery system (20). After the incoming hot secondary air passes through the tapered section of the venturi ejector a (16) to accelerate and reduce the pressure, the non-condensable gas in the deaerator and the exhaust gas recovery system (20) is ejected at the throat. The two are fully mixed in the diffuser section of the venturi ejector a (16) and then discharged from the outlet of the venturi ejector a (16).

7. A system for improving deaerator performance according to claim 1, characterized in that: The inlet of the venturi ejector b (23) is connected to the incoming hot secondary air, and the ejection port is connected to the oxygen in the oxygen storage tank (28). After the incoming hot secondary air passes through the gradually contracting section of the venturi ejector b (23) to accelerate and reduce the pressure, it ejects the oxygen in the oxygen storage tank (28) at the throat. The two are fully mixed in the gradually expanding section of the venturi ejector b (23) and discharged from the outlet of the venturi ejector b (23).

8. A system for improving deaerator performance according to claim 1, characterized in that: The upper end of the connecting pipeline k (35) is connected to the mixed flow inlet (202) of the air duct (2), and the induced air and the secondary air are mixed and flow from the secondary air outlet of the air duct (2) to the secondary air box (36) to serve as the secondary air source for combustion in the furnace.

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