Steam condensate recovery and deaerator energy-saving device

Abstract

The utility model discloses a steam condensate recovery and deaerator energy-saving device which comprises a condensate recovery branch, a soft water branch, a deaeration branch, a boiler branch and a PLC (programmable logic controller) control unit. The condensate water recycling branch and the soft water branch are both connected to the deoxidizing branch, the condensate water recycling branch and the soft water branch supply water required by deoxidizing of the deoxidizing branch, the deoxidizing branch is connected with the boiler branch, the deoxidizing branch supplies water required by steam generation to the boiler branch, and the boiler branch is connected with the condensate water recycling branch and the soft water branch. The boiler branch is used for returning generated steam waste heat to the deoxidizing branch through a specific path; the PLC control unit is used for stably controlling the liquid level of the deoxidizing branch and automatically adjusting the water inlet amount, the steam inlet amount and the condensate water recycling amount of the deoxidizing branch. The utility model is mainly used in the technical field of tobacco processing, and ensures that each machine can be balanced in supply and demand through the real-time liquid level monitoring of each machine, thereby reducing the water replenishing amount and effectively reducing the waste of energy.

Description

Technical Field

[0001] The utility model belongs to the technical field of tobacco processing, and particularly relates to a steam condensate recovery and deaerator energy-saving device. Background Art

[0002] When the boiler is in operation, a large amount of condensed water is generated during the use of steam. The condensed water is recycled and returned to the deaerator for recycling. After the condensed water is recycled, it enters the deaerator. In the process of boiler water system circulation, the deaerator liquid level often continues to rise due to the large amount of condensed water recovered. When the upper limit liquid level is reached, the drain valve automatically opens to drain water, resulting in waste of water and heat. At the same time, when the deaerator and boiler load are large and the water demand is large, the deaerator needs to increase the amount of soft water to replenish water due to the low liquid level. At this time, a large amount of steam is needed to heat and deoxidize, resulting in the failure to fully utilize the high-temperature condensed water recovery, and a large amount of replenishment requires the consumption of steam energy waste. Utility Model Content

[0003] The purpose of the utility model is to address the problems of increased soft water replenishment, insufficient utilization of high-temperature condensed water recovery, and inability to recycle steam, and propose a steam condensate recovery and deaerator energy-saving device. The utility model coordinates each branch and monitors the energy consumption of each branch, so as to achieve the effect of fully utilizing energy and making water resources fully utilized.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A steam condensate recovery and deaerator energy-saving device comprises a condensate recovery branch, a soft water branch, a deoxygenation branch, a boiler branch and a PLC control unit; the condensate recovery branch and the soft water branch are both connected to the deoxygenation branch, the water amount in the condensate recovery branch and the soft water branch is the water amount required for deoxygenation of the deoxygenation branch, the deoxygenation branch is connected to the boiler branch, the deoxygenation branch provides the boiler branch with the water amount required for generating steam, and the boiler branch returns the generated steam waste heat to the deoxygenation branch; the PLC control unit is used to stably control the liquid level of the deoxygenation branch, and automatically adjust the water inlet, steam inlet and condensate recovery amount of the deoxygenation branch.

[0006] As a further technical improvement, the condensate recovery branch includes a condensate recovery tank, a condensate liquid level sensor, a condensate temperature sensor, a condensate pump, and a first condensate electric regulating valve and a second condensate electric regulating valve; the condensate liquid level sensor and the condensate temperature sensor are arranged on the condensate recovery tank, and a condensate pump is arranged at the output end of the condensate recovery tank, and the first condensate electric regulating valve and the second condensate electric regulating valve are arranged at the output end of the condensate pump, and the first condensate electric regulating valve and the second condensate electric regulating valve are both connected to the deoxygenation branch.

[0007] As a further technical improvement, the deoxygenation branch includes a deoxygenator, a deoxygenation temperature sensor, a deoxygenation liquid level sensor, a deoxygenation steam inlet electric valve and a deoxygenation drain electric valve; the deoxygenator includes a first deoxygenator and a second deoxygenator; the deoxygenation temperature sensor includes a first deoxygenation temperature sensor and a second deoxygenation temperature sensor, the deoxygenation liquid level sensor includes a first deoxygenation liquid level sensor and a second deoxygenation liquid level sensor, the deoxygenation steam inlet electric valve includes a first deoxygenation steam inlet electric valve and a second deoxygenation steam inlet electric valve, the deoxygenation drain electric valve includes a first deoxygenation drain electric valve and a second deoxygenation drain electric valve; the first deoxygenator and the second deoxygenator are respectively provided with the first deoxygenation temperature sensor and the second deaerator temperature sensor, and the first deaerator and the second deaerator are respectively provided with the first deaerator liquid level sensor and the second deaerator liquid level sensor, the output ends of the first deaerator and the second deaerator are respectively provided with the first deaerator drain electric valve and the second deaerator drain electric valve, the other ends of the first deaerator drain electric valve and the second deaerator drain electric valve are both connected to the soft water branch, the input ends of the first deaerator and the second deaerator are respectively provided with the first deaerator steam inlet electric valve and the second deaerator steam inlet electric valve, the other ends of the first deaerator steam inlet electric valve and the second deaerator steam inlet electric valve are both connected to the boiler branch.

[0008] As a further technical improvement, the boiler branch includes a water supply pump, a boiler and a steam cylinder; one end of the water supply pump is connected to the first deaerator, the other end of the water supply pump is connected to the boiler, the other end of the boiler is connected to the steam cylinder, and the output ends of the steam cylinder are respectively connected to the first deaerator steam inlet electric valve and the second deaerator steam inlet electric valve.

[0009] As a further technical improvement, the soft water branch includes a water softener, a soft water tank, a soft water tank liquid level sensor, a soft water pump, and a first soft water electric valve and a second soft water electric valve; the water softener is connected to the soft water tank, the water softener provides soft water for the soft water tank, the soft water tank is provided with the soft water tank liquid level sensor, the output end of the soft water tank is provided with the soft water pump, the output end of the soft water pump is respectively connected to the first soft water electric valve and the second soft water electric valve, and the other ends of the first soft water electric valve and the second soft water electric valve are respectively connected to the first deaerator and the second deaerator.

[0010] As a further technical improvement, the other end of the water softener is connected to a tap water supply device, and the tap water supply device provides the water softener with water consumed in the recycling process.

[0011] As a further technical improvement, the condensate recovery tank is externally connected to the steam-using equipment, and the condensate recovery tank is used to recover the waste heat of steam in the steam-using equipment.

[0012] Compared with the existing technology, the utility model has the following beneficial effects:

[0013] 1. In the utility model, the device carries out intelligent joint control of the steam condensate recovery and the soft water system. The steam condensate is preferentially returned to the first deaerator according to the deaerator operation signal control. When the boiler is operating at normal load, the continuous water supply of the boiler can consume the water volume of the first deaerator. When the boiler is operating at a small load and the steam condensate recovery volume is large, after the liquid level of the first deaerator continues to rise, the steam condensate enters the second deaerator. When the liquid levels of the two deaerators are both at the high limit, the water is automatically drained to the soft water tank for storage, the soft water temperature is increased, and continuous water replenishment and water supply of the boiler are formed, ensuring that the water volume and heat of the steam condensate can be fully utilized. At the same time, the boiler feed water temperature is increased, the water replenishment volume of the softener is reduced, the consumption of deoxygenated steam is reduced, the discharge of deaerator condensate is reduced, and energy waste is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0015] Figure 1 It is a schematic diagram of the line distribution structure of the utility model.

[0016] Description of reference numerals:

[0017] 101- condensate recovery tank, 102- condensate level sensor, 103- condensate temperature sensor, 104- condensate pump, 105- first condensate electric regulating valve, 106- second condensate electric regulating valve, 201- water softener, 202- soft water tank, 203- soft water tank level sensor, 204- soft water pump, 205- first soft water electric valve, 206- second soft water electric valve, 301- first deaerator, 302- second deaerator , 303-first deaerator temperature sensor, 304-second deaerator temperature sensor, 305-first deaerator liquid level sensor, 306-second deaerator liquid level sensor, 307-first deaerator steam inlet electric valve, 308-second deaerator steam inlet electric valve, 309-first deaerator drain electric valve, 310-second deaerator drain electric valve, 401-water supply pump, 402-boiler, 403-steam cylinder, 501-PLC control unit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is a description of the embodiments of the present invention based on its overall structure.

[0022] like Figure 1 As shown, the utility model provides a steam condensate recovery and deaerator energy-saving device, including a condensate recovery branch, a soft water branch, a deoxygenation branch, a boiler branch and a PLC control unit 501; the condensate recovery branch and the soft water branch are both connected to the deoxygenation branch, the water amount in the condensate recovery branch and the soft water branch is the water amount required for deoxygenation of the deoxygenation branch, the deoxygenation branch is connected to the boiler branch, the deoxygenation branch provides the boiler branch with the water amount required for generating steam, and the boiler branch returns the generated steam waste heat to the deoxygenation branch; the PLC control unit 501 is used to stably control the liquid level of the deoxygenation branch, and automatically adjust the water inlet, steam inlet and condensate recovery amount of the deoxygenation branch. In this embodiment, the condensate branch conveys water to the deoxygenation branch to supply the deoxygenation branch with the water required for thermal deoxygenation. The deoxygenation branch in turn conveys water to the boiler branch to supply the boiler branch with the water required for generating steam. Part of the steam generated by the boiler branch is used for process production, and part of the steam returns to the deoxygenation branch through a specific channel to supply the deoxygenation branch with thermal deoxygenation. When the water level of the deoxygenation branch is too high, the deoxygenation branch discharges water to the soft water branch to increase the soft water temperature and improve the waste heat utilization rate. When the condensate branch cannot provide sufficient water for the deoxygenation branch, the soft water branch When it starts running, the soft water in the soft water branch enters the deoxygenation branch after being pressurized. The channel for returning steam waste heat from the boiler branch is also opened, and the steam waste heat is transported to the deoxygenation branch. Combined with the water provided by the soft water branch, the temperature is raised to above 104 degrees until it meets the temperature for thermal deoxygenation. In addition to bringing back waste heat, the steam will also bring back a certain amount of water, which will cause the water level in the deoxygenation branch to rise. Part of it is transported to the boiler branch, and part of it is returned to the soft water branch for storage for the next use. Such recycling can greatly improve resource utilization.

[0023] The condensate recovery branch includes a condensate recovery tank 101, a condensate level sensor 102, a condensate temperature sensor 103, a condensate pump 104, and a first condensate electric regulating valve 105 and a second condensate electric regulating valve 106; the condensate level sensor 102 and the condensate temperature sensor 103 are arranged on the condensate recovery tank 101, and the output end of the condensate recovery tank 101 is provided with a condensate pump 104, and the output end of the condensate pump 104 is provided with the first condensate electric regulating valve 105 and the second condensate electric regulating valve 106, and the first condensate electric regulating valve 105 and the second condensate electric regulating valve 106 are both connected to the deoxygenation branch. In this embodiment, a liquid level sensor 102 is installed on the steam condensate recovery tank 101 to monitor the tank liquid level in real time. When the tank liquid level reaches the set upper limit, the detection signal is fed back to the PLC control unit 501, and the PLC control unit 501 controls the condensate pump 104 to open. The PLC control unit 501 outputs a control signal to automatically open the first condensate electric regulating valve 105 and close the second condensate electric regulating valve 106, and control the condensate to be transported to the first deaerator 301 (or the second deaerator 302, whichever deaerator is in operation can open or close the corresponding valve). Whether it is opened or closed, it is controlled by the PLC control unit 501.

[0024] The deoxygenation branch includes a deoxygenator, a deoxygenation temperature sensor, a deoxygenation liquid level sensor, a deoxygenation steam inlet electric valve and a deoxygenation drain electric valve; the deoxygenator includes a first deoxygenator 301 and a second deoxygenator 302; the deoxygenation temperature sensor includes a first deoxygenation temperature sensor 303 and a second deoxygenation temperature sensor 304, the deoxygenation liquid level sensor includes a first deoxygenation liquid level sensor 305 and a second deoxygenation liquid level sensor 306, the deoxygenation steam inlet electric valve includes a first deoxygenation steam inlet electric valve 307 and a second deoxygenation steam inlet electric valve 308, the deoxygenation drain electric valve includes a first deoxygenation drain electric valve 309 and a second deoxygenation drain electric valve 310; the first deoxygenator 301 and the second deoxygenator 302 are respectively provided with the first deoxygenation temperature sensor 303 and the second deoxygenation temperature sensor 310. The first deaerator 304, and the first deaerator 301 and the second deaerator 302 are respectively provided with the first deaerator liquid level sensor 305 and the second deaerator liquid level sensor 306, the output ends of the first deaerator 301 and the second deaerator 302 are respectively provided with the first deaerator drainage electric valve 309 and the second deaerator drainage electric valve 310, the other ends of the first deaerator drainage electric valve 309 and the second deaerator drainage electric valve 310 are both connected to the soft water branch, the input ends of the first deaerator 301 and the second deaerator 302 are respectively provided with the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308, the other ends of the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308 are both connected to the boiler branch. In this embodiment, the first deaerator 301 is connected to the second deaerator 302, but there is a valve in the middle that is in a closed state during operation. Under normal operation, only one of the deaerators is in operation, and the two deaerators are used alternately. If the two deaerators are used at the same time, their liquid levels will be consistent, and condensate recovery cannot be maximized. The condensate of the condensate recovery branch mainly comes from steam-using equipment. The condensate recovery branch provides water and waste heat (steam waste heat) to the deaerator branch. For example, when the condensate recovery branch transports condensate to the first deaerator 301, if the temperature does not reach the temperature required for deoxidation, the steam waste heat channel (deoxidation steam inlet electric valve) between the deaerator branch and the boiler branch will be opened to increase the temperature of the water in the deaerator. After the first deaerator 301 is deoxidized by heat, water is supplied to the boiler 402 by the water supply pump 401. After the boiler 402 generates steam, it goes to the steam cylinder 403. Part of the steam is used for process production, and part of the steam returns to the deaerator branch to provide thermal deoxidation for the deaerator. The cycle is repeated to maximize resource utilization.

[0025] The boiler branch includes a water supply pump 401, a boiler 402 and a steam cylinder 403; one end of the water supply pump 401 is connected to the first deaerator 301, the other end of the water supply pump 401 is connected to the boiler 402, the other end of the boiler 402 is connected to the steam cylinder 403, and the output end of the steam cylinder 403 is respectively connected to the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308. In this embodiment, when the boiler 402 generates steam and reaches the steam cylinder 403, a part of the steam is used for process production, and the other part of the steam enters the corresponding deaerator when the first deaerator steam inlet electric valve 307 or the second deaerator steam inlet electric valve 308 is opened, providing thermal deoxidation for the deaerator.

[0026] The soft water branch includes a water softener 201, a soft water tank 202, a soft water tank liquid level sensor 203, a soft water pump 204, and a first soft water electric valve 205 and a second soft water electric valve 206; the water softener 201 is connected to the soft water tank 202, the water softener 201 provides soft water for the soft water tank 202, the soft water tank 202 is provided with the soft water tank liquid level sensor 203, the output end of the soft water tank 202 is provided with the soft water pump 204, the output end of the soft water pump 204 is respectively connected to the first soft water electric valve 205 and the second soft water electric valve 206, the other ends of the first soft water electric valve 205 and the second soft water electric valve 206 are respectively connected to the first deaerator 301 and the second deaerator 302. In this embodiment, when soft water needs to be delivered to the deaerator, the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308 on the first deaerator 301 and the second deaerator 302 are also opened to deliver the waste heat of steam back to the deaerator so that the heat inside the deaerator reaches the heat required for deoxygenation.

[0027] The other end of the water softener 201 is connected to a tap water supply device, and the tap water supply device provides the water consumed in the recycling process for the water softener 201. In this embodiment, when the soft water tank 202 or other equipment is insufficiently supplied with water, the water softener 201 is connected to external tap water, and produces soft water through a series of operations, a part of which is stored in the soft water tank 202, and a part is transported to the deaerator for operating various equipment.

[0028] The condensate recovery tank 101 is externally connected to the steam-using equipment, and is used to recover the waste heat of steam in the steam-using equipment. The condensate generated by the steam-using equipment is collected and recovered by the condensate recovery tank 101, and the condensate recovery tank 101 transmits the collected condensate to the first deaerator 301 and the second deaerator 302. The first deaerator 301 and the second deaerator 302 are then transmitted to various equipment through a series of operations, and the operation is continuously cyclically repeated. In this way, water resources are recycled and the utilization of waste heat of steam is maximized.

[0029] The use method of the utility model: when the equipment is automatically running, the liquid level sensor 102 on the steam condensate recovery tank, the soft water tank liquid level sensor 203, the first deaerator liquid level sensor 305 and the second deaerator liquid level sensor 306 are detected in real time. For example, when the first deaerator 301 is running, when the tank liquid level 102 reaches the set high limit, the detection signal is fed back to the PLC control unit 501, the PLC control unit 501 controls the condensate pump to open, and the PLC control unit 501 outputs a control signal to automatically open the first condensate electric regulating valve 105, close the second condensate electric regulating valve 106, and control the condensate to be recovered to the first deaerator 301. The first deaerator 301 is equipped with a first deaerator liquid level sensor 305. When the water level of the first deaerator 301 reaches the set high limit, the detection signal is fed back to the PLC control unit 501, and the PLC control unit 501 outputs a control signal to automatically close the first condensate electric regulating valve 105, open the second condensate electric regulating valve 106, and control the condensate to be recovered to the second deaerator 302. The second deaerator 302 is equipped with a second deaerator liquid level sensor 306. When the water level detected by the first deaerator liquid level sensor 305 and the second deaerator liquid level sensor 306 reaches the upper limit, the detection signal is fed back to the PLC control unit 501, and the PLC control unit 501 outputs a control signal to automatically open the first deaerator drainage electric valve 309 and the second deaerator drainage electric valve 310 to drain the water to the soft water tank 202, thereby increasing the soft water temperature, improving the waste heat utilization rate, and storing it in the soft water tank 202 for the next use. The water softener 201 is equipped with a water production signal receiver. When the amount of condensate recovered can meet the normal water level of the deaerator, the PLC control unit 501 outputs a water stop signal to the water softener 201, the water softener 201 stops working, and closes the first soft water electric valve 205 and the second soft water electric valve 206 to reduce the soft water consumption; when the amount of condensate recovered cannot meet the normal water level of the deaerator, the PLC control unit 501 outputs a water production signal to the water softener 201 to start running and deliver water to the first deaerator 301 or the second deaerator 302. The first deaerator 301 and the second deaerator 302 are both provided with temperature and pressure sensors for detecting the temperature and pressure of the deaerator. The PLC control unit 501 controls the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308 to open. When the condensate recovery amount is normal and the water temperature of the deaerator reaches the deoxidation temperature, the PLC control unit 501 controls the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308 to close to reduce steam consumption. When the water level of the deaerator is at the set lower limit water level and the condensate supply is insufficient, the soft water in the soft water tank 202 is pressurized by the soft water pump 204 and enters the deaerator. The PLC control unit 501 controls the first deaerator steam inlet electric valve 307 and the second deaerator steam inlet electric valve 308 to open to transport steam waste heat to the inside of the deaerator for thermal deoxidation, thereby ensuring that the deaerator reaches a stable thermal deoxidation temperature and ensures the safe operation of the deaerator.

[0030] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed after reading this specification without departing from the principles and purpose of the present invention, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A steam condensate recovery and deaerator energy saving device, characterized in that: include: A condensate recovery branch, a soft water branch, a deoxygenation branch, a boiler branch and a PLC control unit (501); the condensate recovery branch and the soft water branch are both connected to the deoxygenation branch, the amount of water in the condensate recovery branch and the soft water branch is the amount of water required for deoxygenation of the deoxygenation branch, the deoxygenation branch is connected to the boiler branch, the deoxygenation branch provides the boiler branch with the amount of water required for generating steam, and the boiler branch returns the generated steam waste heat to the deoxygenation branch; the PLC control unit (501) is used to stably control the liquid level of the deoxygenation branch and automatically adjust the water intake, steam intake and condensate recovery amount of the deoxygenation branch.

2. A steam condensate recovery and deaerator energy saving device according to claim 1, characterized in that: The condensate recovery branch comprises a condensate recovery tank (101), a condensate level sensor (102), a condensate temperature sensor (103), a condensate pump (104), and a first condensate electric regulating valve (105) and a second condensate electric regulating valve (106); the condensate level sensor (102) and the condensate temperature sensor (103) are arranged on the condensate recovery tank (101); the output end of the condensate recovery tank (101) is provided with a condensate pump (104); the output end of the condensate pump (104) is provided with the first condensate electric regulating valve (105) and the second condensate electric regulating valve (106); the first condensate electric regulating valve (105) and the second condensate electric regulating valve (106) are both connected to the deoxygenation branch.

3. A steam condensate recovery and deaerator energy saving device according to claim 1, characterized in that: The deoxygenation branch comprises a deoxygenator, a deoxygenation temperature sensor, a deoxygenation liquid level sensor, a deoxygenation steam inlet electric valve and a deoxygenation drain electric valve; the deoxygenator comprises a first deoxygenator (301) and a second deoxygenator (302); the deoxygenation temperature sensor comprises a first deoxygenation temperature sensor (303) and a second deoxygenation temperature sensor (304); the deoxygenation liquid level sensor comprises a first deoxygenation liquid level sensor (305) and a second deoxygenation liquid level sensor (306); the deoxygenation steam inlet electric valve comprises a first deoxygenation steam inlet electric valve (307) and a second deoxygenation steam inlet electric valve (308); the deoxygenation drain electric valve comprises a first deoxygenation drain electric valve (309) and a second deoxygenation drain electric valve (310); the first deoxygenator (301) and the second deoxygenator (302) are respectively provided with the first deoxygenation temperature sensor (303) and the second deoxygenation temperature sensor (30 4), and the first deaerator (301) and the second deaerator (302) are respectively provided with the first deaerator liquid level sensor (305) and the second deaerator liquid level sensor (306), the first deaerator (301) and the second deaerator (302) are respectively provided with the first deaerator drain electric valve (309) and the second deaerator drain electric valve (310) at the output ends, the first deaerator (301) and the second deaerator (302) are respectively provided with the first deaerator drain electric valve (309) and the second deaerator drain electric valve (310), the other ends of the first deaerator drain electric valve (309) and the second deaerator drain electric valve (310) are both connected to the soft water branch, the first deaerator (301) and the second deaerator (302) are respectively provided with the first deaerator steam inlet electric valve (307) and the second deaerator steam inlet electric valve (308), the other ends of the first deaerator steam inlet electric valve (307) and the second deaerator steam inlet electric valve (308) are both connected to the boiler branch.

4. A steam condensate recovery and deaerator energy saving device according to claim 3, characterized in that: The boiler branch comprises a water supply pump (401), a boiler (402) and a steam cylinder (403); one end of the water supply pump (401) is connected to the first deaerator (301), the other end of the water supply pump (401) is connected to the boiler (402), the other end of the boiler (402) is connected to the steam cylinder (403), and the output end of the steam cylinder (403) is respectively connected to the first deaerator steam inlet electric valve (307) and the second deaerator steam inlet electric valve (308).

5. A steam condensate recovery and deaerator energy saving device according to claim 3, characterized in that: The soft water branch comprises a water softener (201), a soft water tank (202), a soft water tank liquid level sensor (203), a soft water pump (204), and a first soft water electric valve (205) and a second soft water electric valve (206); the water softener (201) is connected to the soft water tank (202), the water softener (201) provides soft water for the soft water tank (202), the soft water tank (202) is provided with the soft water tank liquid level sensor (203), the output end of the soft water tank (202) is provided with the soft water pump (204), the output end of the soft water pump (204) is respectively connected to the first soft water electric valve (205) and the second soft water electric valve (206), and the other ends of the first soft water electric valve (205) and the second soft water electric valve (206) are respectively connected to the first deaerator (301) and the second deaerator (302).

6. A steam condensate recovery and deaerator energy saving device according to claim 5, characterized in that: The other end of the water softener (201) is connected to a tap water supply device, and the tap water supply device provides the water softener (201) with water consumed in the recycling process.

7. A steam condensate recovery and deaerator energy saving device according to claim 2, characterized in that: The condensate recovery tank (101) is externally connected to a steam-using device, and the condensate recovery tank (101) is used to recover the residual heat of steam in the steam-using device.

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