Operation efficiency optimization system of boiler

Abstract

The invention discloses an operation efficiency optimization system for boilers. The operation efficiency optimization system comprises a first boiler and a second boiler connected with the first boiler in parallel. The first boiler is respectively communicated with the deoxygenated water tank, the energy saver and the steam header; the second boiler is respectively communicated with the deoxygenated water tank, the energy saver and the steam header; the output end of the energy saver is communicated with the chimney, the first combustion engine and the second combustion engine; the steam header is respectively communicated with the first deoxygenated water tank and the second deoxygenated water tank; the softened water tank is communicated with the first deoxygenated water tank and the second deoxygenated water tank; the bleeder is arranged at the top of the softened water tank; the first boiler is provided with a first controller, the first burner is provided with a first camera, the second boiler is provided with a second controller, and the second burner is provided with a second camera. The AI technology is used for automatically controlling the gas-steam ratio of the boiler to be the lowest and the exhaust smoke harmful substance to be the lowest; while thermal deoxidization is carried out, the operation pressure of the deoxidization water tank can be improved, the requirements of steam utilization equipment are met, and the two functions of deoxidization and steam supply are achieved at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler, in particular to a running efficiency optimization system of boiler. BACKGROUND

[0002] The boiler system installs the oxygen-removing water tank, which is generally used for thermal deoxidization of boiler water supply. Thermal deoxidization is achieved by steam heating, which consumes a large amount of steam. Generally speaking, thermal deoxidization reduces 18%~20% of effective external steam supply, which increases the capacity demand of the boiler, and thus expands the land occupation and equipment scale, and indirectly increases the capital investment.

[0003] Thermal deoxidization requires heating the inlet water to saturation temperature to precipitate oxygen. If the inlet water temperature is insufficient, the deoxidization effect will be greatly reduced. This requires the boiler system to be equipped with a stable heating source and strictly control the inlet water temperature, which increases the operation cost and complexity. SUMMARY

[0004] In view of the above, the present application aims to provide a running efficiency optimization system of boiler to solve the aforementioned technical problems.

[0005] The technical solution adopted by the present application is as follows:

[0006] The present application provides a running efficiency optimization system of boiler, which comprises:

[0007] A first boiler and a second boiler arranged in parallel with the first boiler;

[0008] The output end of the first boiler is in communication with an oxygen-removing water tank, an economizer and a cylinder;

[0009] The output end of the second boiler is in communication with the oxygen-removing water tank, the economizer and the cylinder;

[0010] The output end of the economizer is in communication with a chimney, a first combustion machine and a second combustion machine;

[0011] The cylinder is in communication with a first oxygen-removing water tank and a second oxygen-removing water tank;

[0012] A soft water tank in communication with the first oxygen-removing water tank and the second oxygen-removing water tank;

[0013] A diffusion pipe arranged at the top of the soft water tank;

[0014] The first boiler is provided with a first controller, and a first camera is arranged on the first combustion machine, which is electrically connected with the first controller;

[0015] The second boiler is provided with a second controller, and a second camera is arranged on the second combustion machine, which is electrically connected with the second controller;

[0016] The first camera shoots first flame color data in the first boiler and transmits to the first controller, and the first controller controls the proportion of gas and air in the first combustion machine according to the first flame color data;

[0017] The second camera shoots second flame color data in the second boiler and transmits to the second controller, and the second controller controls the proportion of gas and air in the second combustion machine according to the second flame color data.

[0018] The above scheme of the present application at least includes the following beneficial effects:

[0019] The above scheme of the present application includes: a first boiler and a second boiler arranged in parallel with the first boiler; the output end of the first boiler is communicated with a deoxygenated water tank, an economizer and a cylinder; the output end of the second boiler is communicated with the deoxygenated water tank, the economizer and the cylinder; the output end of the economizer is communicated with a chimney, a first combustion machine and a second combustion machine; the cylinder is communicated with a first deoxygenated water tank and a second deoxygenated water tank; a soft water tank communicated with the first deoxygenated water tank and the second deoxygenated water tank; a diffuser pipe arranged at the top of the soft water tank; the first boiler is provided with a first controller, the first combustion machine is provided with a first camera, the first camera is electrically connected with the first controller; the second boiler is provided with a second controller, the second combustion machine is provided with a second camera, the second camera is electrically connected with the second controller; the first camera shoots first flame color data in the first boiler and transmits to the first controller, and the first controller controls the proportion of gas and air in the first combustion machine according to the first flame color data; the second camera shoots second flame color data in the second boiler and transmits to the second controller, and the second controller controls the proportion of gas and air in the second combustion machine according to the second flame color data. The deoxygenated water tank of the scheme of the present application can improve the operating pressure of the deoxygenated water tank while deoxygenating, and can meet the demand of low-pressure steam equipment, so as to serve as an auxiliary equipment for adjusting the operating load of the boiler, and has the functions of deoxygenation and steam supply. The controller uses AI technology to automatically control the gas-steam ratio of the boiler and the harmful substances in the exhaust gas of the boiler according to the current state of the flame, the color and brightness corresponding to the flame, and the load and state of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described below with reference to the drawings, in which:

[0021] Figure 1 The schematic diagram of the operation efficiency optimization system of the boiler provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] The present invention proposes an embodiment of a boiler operation efficiency optimization system. Specifically, Figure 1 shown, including:

[0024] a first boiler 53, and a second boiler 68 arranged in parallel with the first boiler 53;

[0025] The output end of the first boiler 53 is connected to the deaerated water tank 28, the economizer 81, and the steam cylinder 85 respectively;

[0026] The output end of the second boiler 68 is connected to the deaerated water tank 28, the economizer 81, and the steam cylinder 85;

[0027] The output end of the economizer 81 is in communication with the chimney 83, the first burner 43, and the second burner 59;

[0028] The sub-cylinder 85 is communicated with the first deaeration water tank 28 and the second deaeration water tank 30 respectively;

[0029] a soft water tank 1 in communication with both the first deaerated water tank 28 and the second deaerated water tank 30;

[0030] A discharge pipe 3 is provided on the top of the soft water tank 1;

[0031] The first boiler 53 is provided with a first controller 42 , and the first burner 43 is provided with a first camera 44 , and the first camera 44 is electrically connected to the first controller 42 ;

[0032] The second boiler 68 is provided with a second controller 60 , and the second burner 59 is provided with a second camera 58 , and the second camera 58 is electrically connected to the second controller 60 ;

[0033] The first camera 44 captures first flame color data in the first boiler 53 and transmits the data to the first controller 42 . The first controller 42 controls the ratio of gas and air in the first burner 43 according to the first flame color data.

[0034] The second camera 58 captures the second flame color data in the second boiler 68 and transmits the data to the second controller 60 . The second controller 60 controls the ratio of gas and air in the second burner 59 according to the second flame color data.

[0035] The first boiler 53 is communicated with the economizer 81 through the first flue gas and the flue 47;

[0036] The first flue gas is provided with the third oxygen content detector 48 and the first flue gas flow meter 49 on the flue 47. The second boiler 68 is communicated with the economizer 81 through the second flue gas and the flue 55; the second flue gas is provided with the fourth oxygen content detector 51 and the second flue gas flow meter 52 on the flue 55.

[0037] The first output end of the economizer 81 is communicated with the chimney 83; the second output end of the economizer 81 is communicated with the first air inlet flue 54 and the second air inlet flue 67 through the back smoke pipe 84; the back smoke pipe 84 is sequentially provided with the third butterfly valve 82.

[0038] The first end of the first air inlet flue 54 is communicated with the back smoke pipe 84, and the second end is communicated with the first boiler 53; the first air inlet flue 54 is communicated with the back smoke pipe 84 through the first back smoke flow meter 37 and the first butterfly valve 36; the first end of the second air inlet flue 67 is communicated with the back smoke pipe 84, and the second end is communicated with the second boiler 68; the second air inlet flue 67 is communicated with the back smoke pipe 84 through the second back smoke flow meter 64 and the second butterfly valve 63.

[0039] The first air inlet flue 54 is provided with the first air blower 38 and the first oxygen content detector 41; air enters the first combustion machine 43 through the first air blower 38 and the first oxygen content detector 41; the second air inlet flue 67 is provided with the second air blower 65 and the second oxygen content detector 61; air enters the second combustion machine 59 through the second air blower 65 and the second oxygen content detector 61.

[0040] The first combustion machine 43 is communicated with the first gas pressure regulating device 39 and the first gas flow meter 40; gas enters the first combustion machine 43 through the first gas pressure regulating device 39 and the first gas flow meter 40; the second combustion machine 59 is communicated with the second gas pressure regulating device 66 and the second gas flow meter 62; gas enters the second combustion machine 59 through the second gas pressure regulating device 66 and the second gas flow meter 62.

[0041] The first boiler 53 is communicated with the steam cylinder 85 through the first valve 46, the first steam flow meter 50 and the second valve 71; the second boiler 68 is communicated with the steam cylinder 85 through the third valve 56, the second steam flow meter 69 and the fourth valve 70.

[0042] The first output end of the steam cylinder 85 is communicated with the first steam using equipment 80 through the fifth valve 74 and the first pipeline 79; the second output end of the steam cylinder 85 is communicated with the second steam using equipment 76 through the third electric valve 73, the first pressure sensor 77 and the second pipeline 78.

[0043] The first heater 29 is arranged in the first oxygen-removing water tank 28, and the second heater 31 is arranged in the second oxygen-removing water tank 30; the first oxygen-removing water tank 28 is communicated with the fourth pipeline 13 through the first electric valve 18 and the third pipeline 19; the second oxygen-removing water tank 30 is communicated with the fourth pipeline 13 through the second electric valve 12 and the fifth pipeline 14; the fourth pipeline 13 is communicated with the soft water tank 1 through the ninth electric valve 4.

[0044] In the embodiment, the first flue gas discharged from the first boiler 53 enters the economizer 81 through the flue 47, the third oxygen content detector 48 and the first flue gas flowmeter 49; the second flue gas discharged from the second boiler 68 also enters the economizer 81 through the flue 55, the fourth oxygen content detector 51 and the second flue gas flowmeter 52; the flue gas flows out of the economizer 81 after absorbing heat energy and is discharged into the chimney 83.

[0045] The small part of the flue gas after passing through the economizer 81 enters the first air inlet duct 54 of the first boiler 53 through the third butterfly valve 82 and the back flue 84 and the first back flue flowmeter 37 and the first butterfly valve 36, and enters the second air inlet duct 67 of the second boiler 68 through the second back flue flowmeter 64 and the second butterfly valve 63; the flue gas mixes with the air in the first air inlet duct 54 and the second air inlet duct 67 to become new gas with different oxygen content from that of the atmosphere, and then enters the first combustion machine 43 through the first oxygen content detector 41 and the second combustion machine 59 through the second oxygen content detector 61.

[0046] The gas entering the first combustion machine 43 through the first gas pressure regulating device 39 and the first gas flowmeter 40 is combusted with the new air entering the first combustion machine 43, and the heat energy after combustion is absorbed by the first boiler 53 to generate steam. The steam generated by the first boiler 53 enters the steam cylinder 85 through the first valve 46, the first steam flowmeter 50 and the second valve 71, and the steam generated by the second boiler 68 also enters the steam cylinder 85 through the third valve 56, the second steam flowmeter 69 and the fourth valve 70.

[0047] The first controller 42 of the first boiler 53 and the second controller 60 of the second boiler 68 are provided with an artificial intelligence AI control program, so that the control systems of the first boiler 53 and the second boiler 68 have certain self-learning ability. The first camera 44 is installed on the first combustion machine 43 of the first boiler 53, and the second camera 58 is installed on the second combustion machine 59 of the second boiler 68. The first camera 44 and the second camera 58 can respectively capture the flame state of the first boiler 53 and the second boiler 68 under different operating load conditions, such as the color of the flame being light blue, dark blue, pink, dark red, etc. The color of the flame can directly reflect the combustion condition of the flame, such as full combustion, basically full combustion, not quite full combustion, and insufficient combustion, etc. The first camera 44 and the second camera 58 respectively transmit a large amount of picture data to the first controller 42 and the second controller 60. The data detected by the first oxygen content detector 41 and the third oxygen content detector 48 around the first boiler 53, and the related data of the first return smoke flow meter 37, the first gas flow meter 40, the first flue gas flow meter 49, and the first steam flow meter 50 are also uploaded to the first controller 42 of the first boiler 53. The data detected by the second oxygen content detector 61 and the fourth oxygen content detector 51 around the second boiler 68, and the related data of the second return smoke flow meter 64, the second gas flow meter 62, the second flue gas flow meter 52, and the second steam flow meter 69 are also uploaded to the second controller 60 of the second boiler 68. The first controller 42 and the second controller 60 automatically compare various historical data and flame colors of the boiler under different operating loads to determine the ratio of gas and new air, so that the color of the boiler combustion is in the best combustion state. This best combustion state is mainly reflected in the ratio of the detection data of the gas flow meter of the boiler to the detection data of the steam flow meter, that is, the lower the ratio, the better. The lower the ratio, the less fuel gas is consumed to produce the same quality of steam.

[0048] In addition to the full combustion of the boiler, the amount of harmful substances such as nitrogen oxides discharged by the boiler must meet the emission standard. The amount of harmful substances discharged by the boiler, the amount of flue gas, the oxygen content, and the flame combustion state have a great relationship. Here, the first butterfly valve 36 and the second butterfly valve 63 on the flue are adjusted to adjust the ratio of the return smoke flow meter to the air supply of the air supply fan, so that the oxygen content and the total air volume of the air entering the combustion machine and the fuel value, so that the combustion flame is in an adaptive color. At this time, not only is the ratio of the fuel gas consumed by the boiler to the steam produced low, but also the harmful substances such as nitrogen oxides discharged by the boiler are within the standard range.

[0049] Therefore, through the AI technology, the boiler has self-learning, self-adapting, and self-regulating capabilities, so that the operating energy efficiency of the boiler is improved, and the harmful substances discharged are always at a low value.

[0050] The steam in the steam cylinder 85 can enter the first steam equipment 80 through the fifth valve 74 and the first pipeline 79, and the first steam equipment 80 is a high-pressure steam equipment; the steam in the steam cylinder 85 can also enter the second steam equipment 76 through the third electric valve 73, the first pressure sensor 77, the second pipeline 78, and the second steam equipment 76 is a low-pressure steam equipment;

[0051] The steam generated by the steam cylinder 85 can also enter the first heater 29 in the first deoxygenated water tank 28 through the sixth valve 72 and the tenth pipeline 22, and then enter the fourth electric valve 20, so as to heat and deoxygenate the water in the first deoxygenated water tank 28, and enter the second heater 31 in the second deoxygenated water tank 30 through the fifth electric valve 15, so as to heat and deoxygenate the water in the second deoxygenated water tank 30.

[0052] According to Dalton's law of partial pressure, the softened water in the deoxygenated water tank must be heated to above 100℃ to completely deoxygenate, so the first deoxygenated water tank 28 and the second deoxygenated water tank 30 can be heated to a higher temperature under a certain pressure, and the water in the deoxygenated water tank is saturated high-temperature water at this temperature.

[0053] The lower communication valve 34 and the upper communication valve 16 are installed between the first deoxygenated water tank 28 and the second deoxygenated water tank 30, the lower communication valve 34 connects the water in the lower part of the first deoxygenated water tank 28 and the second deoxygenated water tank 30, and the upper communication valve 16 connects the steam in the upper part of the first deoxygenated water tank 28 and the second deoxygenated water tank 30, so that the water and steam in the two deoxygenated water tanks can be used as backup or independently operated.

[0054] When the deoxygenated water tank is deoxygenated, the gas generated in the first deoxygenated water tank 28 and the second deoxygenated water tank 30 can enter the fourth pipeline 13 through the first electric valve 18 at the top, the third pipeline 19, the second electric valve 12, and the fifth pipeline 14, and then enter the soft water tank 1 through the ninth electric valve 4, and the heat in the hot gas is absorbed by the softened water in the soft water tank 1, and then the low-temperature gas is discharged through the diffusion pipe 3 at the top of the soft water tank 1, so as to save heat energy. Since the dissolved oxygen in the water in the soft water tank 1 reaches saturation, the method absorbs the heat energy discharged by the deoxygenated water tank.

[0055] When the water in the first deaerated water tank 28 and the second deaerated water tank 30 is heated and deaerated, and the water level meets the condition, the water in the deaerated water tank is continuously heated to a certain higher temperature, and the deaerated water tank can play a role in adjusting and stabilizing the load of the boiler. Since the efficiency and the content of harmful substances discharged by the boiler also have a certain relationship with the operating load of the boiler. When the steam consumption of the equipment fluctuates and is contrary to the requirement of the AI control system of the first controller 42 or the second controller 60 to increase or decrease the load of the boiler, the system will open the sixth electric valve 75, so that the steam at the top of the first deaerated water tank 28 and the second deaerated water tank 30 is preferentially supplied as a steam source through the second pressure sensor 21, the sixth pipeline 23, the sixth electric valve 75, the first pressure sensor 77, the second pipeline 78 into the second steam-consuming equipment 76, and at this time the boiler does not need to increase the load, and can meet the steam demand.

[0056] When it is necessary to increase the operating load of the boiler, the softened water in the soft water tank 1 is supplied into the second deaerated water tank 30 through the first pump set 2 and the seventh pipeline 8, and into the deaerated water tank 28 through the eighth electric valve 17, and the steam in the steam cylinder 85 can be heated and deaerated in the first deaerated water tank 28 through the sixth valve 72 and the tenth pipeline 22, and in the second deaerated water tank 30 through the fourth electric valve 20 and the fifth electric valve 15, so as to increase the steam consumption as a standby steam source.

[0057] Therefore, the deaerated water tank in the present application can play a role in adjusting and stabilizing the operating load of the boiler, so that the boiler is more energy-saving and environmentally friendly. If the first deaerated water tank 28 and the second deaerated water tank 30 reach an over-high water level and overflow, the water in the first deaerated water tank 28 will flow into the soft water tank 1 through the seventh valve 24, the first drain valve 25, the eighth pipeline 6 and the eighth valve 5, and the water in the second deaerated water tank 30 will flow into the soft water tank 1 through the ninth valve 10, the second drain valve 9, the ninth pipeline 7 and the eighth valve 5, so as to avoid waste caused by overflow. The first drain valve 25 and the second drain valve 9 not only can prevent the deaerated water tank from overflowing, but also can organize the steam in the deaerated water tank to flow out through the overflow point.

[0058] The boiler operation efficiency and emissions are also greatly related to the boiler inlet water temperature. When the first boiler 53 water level is low and needs to be replenished, the high-temperature soft water in the first deaerated water tank 28 can flow into the first boiler 53 through the second pump set 26, the feed water flow meter 27, and the tenth valve 45. When the first boiler 53 water level is low and needs to be replenished, the high-temperature soft water in the first deaerated water tank 28 can flow into the first boiler 53 through the second pump set 26, the feed water flow meter 27, and the tenth valve 45. Therefore, when the AI control system of the first controller 42 or the second controller 60 requires adjusting the boiler inlet water temperature by 0 degrees, the water temperature in the first deaerated water tank 28 and the second deaerated water tank 30 can be adjusted by adjusting the opening degree of the fourth electric valve 20 and the fifth electric valve 15, so that the first boiler 53 and the second boiler 68 are in a better operating state.

[0059] In summary, the present application inputs the AI control program into the controller of the boiler. The deaerated water tank can not only improve the operating pressure of the deaerated water tank while deaerating, but also meet the demand of low-pressure steam equipment, thereby serving as an auxiliary equipment for adjusting the operating load of the boiler, and itself having both deaerating and steam supply functions.

[0060] The combustion efficiency of the boiler is greatly related to the flame. By installing a camera at the front end of the boiler combustion machine to record the state, color, and brightness of the boiler flame under different operating loads of the boiler, and by comparing and recording the feedback of the boiler gas-steam ratio, i.e., the ratio of natural gas to generated steam, the load of the boiler, the oxygen content of the exhaust smoke, and harmful substances, etc., the controller can automatically control the lowest gas-steam ratio of the boiler and the lowest harmful substances in the exhaust smoke of the boiler using AI technology according to the current state of the flame, the corresponding color and brightness of the flame, and the load and state of the boiler. On the basis of AI analysis, the deaerated water tank is used to adjust the operating load and inlet water temperature of the boiler, so that the boiler is in a relatively good and suitable operating state, and the harmful substances in the exhaust smoke are at a relatively low level, which not only saves energy, but also protects the environment. At the same time, after the exhaust smoke heat energy is utilized, the low-oxygen exhaust smoke is returned and mixed into the boiler air supply system, and is compared with the data of the oxygen content of the exhaust smoke, the brightness of the boiler combustion, the load of the boiler, and the gas-steam ratio, etc., as a reference for AI analysis, so that the gas-steam ratio of the boiler is optimal, and the harmful substances such as nitrogen oxides in the exhaust smoke of the boiler are at a minimum, thereby achieving more energy saving and environmental protection.

[0061] If the expression direction is mentioned in the embodiments of the present application, it is based on the relative concept of the embodiments. In addition, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0062] The above describes the structure, features and effects of the present application according to the embodiments shown in the drawings, but the above is only the preferred embodiment of the present application. It should be noted that the technical features involved in the above embodiments and preferred modes can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design idea and technical effects of the present application. Therefore, the present application is not limited by the drawings shown in the drawings. Any change or modification made according to the concept of the present application, or any equivalent embodiment within the scope of the present application, shall be within the scope of the present application.

Claims

1. A boiler operation efficiency optimization system, characterized in that: include: A first boiler (53), and a second boiler (68) arranged in parallel with the first boiler (53); The output end of the first boiler (53) is respectively connected to the first deaeration water tank (28), the economizer (81), and the steam cylinder (85); The output end of the second boiler (68) is respectively connected to the second deaeration water tank (30), the economizer (81), and the steam cylinder (85); The output end of the energy saver (81) is in communication with the chimney (83), the first burner (43), and the second burner (59); The sub-cylinder (85) is respectively connected to the first deaeration water tank (28) and the second deaeration water tank (30); a soft water tank (1) in communication with both the first deoxygenated water tank (28) and the second deoxygenated water tank (30); A discharge pipe (3) provided on the top of the soft water tank (1); The first boiler (53) is provided with a first controller (42), the first burner (43) is provided with a first camera (44), and the first camera (44) is electrically connected to the first controller (42); The second boiler (68) is provided with a second controller (60), the second burner (59) is provided with a second camera (58), and the second camera (58) is electrically connected to the second controller (60); The first camera (44) captures first flame color data in the first boiler (53) and transmits the data to the first controller (42), and the first controller (42) controls the ratio of gas and air in the first burner (43) according to the first flame color data; The second camera (58) captures the second flame color data in the second boiler (68) and transmits the data to the second controller (60). The second controller (60) controls the ratio of gas and air in the second burner (59) according to the second flame color data.

2. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first boiler (53) is connected to the economizer (81) via a first flue gas through a flue (47); A third oxygen content detector (48) and a first flue gas flow meter (49) are provided on the first flue gas duct (47).

3. The boiler operation efficiency optimization system according to claim 1, characterized in that: The second boiler (68) is connected to the economizer (81) via a second flue gas through a flue (55); The second flue gas passage (55) is provided with a fourth oxygen content detector (51) and a second flue gas flow meter (52).

4. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first output end of the economizer (81) is in communication with the chimney (83); The second output end of the energy saver (81) is respectively connected to the first air inlet duct (54) and the second air inlet duct (67) through the smoke return pipe (84); The smoke return pipe (84) is sequentially provided with a third butterfly valve (82).

5. The boiler operation efficiency optimization system according to claim 4, characterized in that: The first end of the first air inlet duct (54) is in communication with the smoke return pipe (84), and the second end is in communication with the first boiler (53); The first air inlet duct (54) is connected to the smoke return pipe (84) via a first smoke return flow meter (37) and a first butterfly valve (36); The first end of the second air inlet duct (67) is in communication with the smoke return pipe (84), and the second end is in communication with the second boiler (68); The second air inlet duct (67) is connected to the smoke return pipe (84) via a second smoke return flow meter (64) and a second butterfly valve (63).

6. The boiler operation efficiency optimization system according to claim 5, characterized in that: The first air inlet duct (54) is provided with a first air blower (38) and a first oxygen content detector (41); Air enters the first burner (43) through the first air blower (38) and the first oxygen content detector (41); The second air inlet duct (67) is provided with a second air blower (65) and a second oxygen content detector (61); Air enters the second burner (59) through the second air blower (65) and the second oxygen content detector (61).

7. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first burner (43) is connected to a first gas pressure regulating device (39) and a first gas flow meter (40), and the gas enters the first burner (43) through the first gas pressure regulating device (39) and the first gas flow meter (40); The second burner (59) is connected to a second gas pressure regulating device (66) and a second gas flow meter (62), and the gas enters the second burner (59) through the second gas pressure regulating device (66) and the second gas flow meter (62).

8. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first boiler (53) is connected to the steam cylinder (85) via a first valve (46), a first steam flow meter (50), and a second valve (71); The second boiler (68) is connected to the steam cylinder (85) via a third valve (56), a second steam flow meter (69), and a fourth valve (70).

9. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first output end of the steam cylinder (85) is connected to the first steam-consuming device (80) via the fifth valve (74) and the first pipeline (79); The second output end of the steam cylinder (85) is connected to the second steam-consuming device (76) via the third electric valve (73), the first pressure sensor (77), and the second pipeline (78).

10. The boiler operation efficiency optimization system according to claim 1, characterized in that: The first deoxygenated water tank (28) is provided with a first heater (29), and the second deoxygenated water tank (30) is provided with a second heater (31); The first deoxygenated water tank (28) is connected to the fourth pipeline (13) through the first electric valve 18 and the third pipeline (19); The second deoxygenated water tank (30) is connected to the fourth pipe (13) via the second electric valve 12 and the fifth pipe (14); The fourth pipeline (13) is connected to the soft water tank (1) through a ninth electric valve (4).

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