Automatic waste steam heat mass recovery device for thermal deoxidization

Abstract

A thermal deoxidization dead steam heat mass automatic recovery device comprises a thermal deaerator, a dead steam condensation separation heat exchanger, a dead steam condensation water tank and a PLC, a dead steam outlet and a condensation water inlet are formed in the top of the thermal deaerator, a first pressure meter is further arranged at the top of the thermal deaerator, and a dissolved oxygen meter is arranged in the thermal deaerator; the dead steam condensation separation heat exchanger is provided with a dead steam inlet, a condensate water outlet, a non-condensed gas discharge outlet, a cooling water inlet, a cooling water outlet and a second pressure gauge, the dead steam outlet is connected with the dead steam inlet through a first dead steam discharge pipe, and the first dead steam discharge pipe is provided with a first discharge electric control valve; a second dead steam discharge pipe is mounted at the non-condensable gas discharge port; and a second discharge electric control valve is arranged on the second dead steam discharge pipe. Dead steam and non-condensable gas can be automatically and accurately discharged according to the actual deoxidization requirement of the system, and the effect of energy-saving and water-saving recovery of the dead steam is achieved while efficient deoxidization of the thermal deaerator is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of thermal systems, and in particular to an automatic heat mass recovery device for thermal deoxygenation exhaust steam. Background Art

[0002] The deaerator is responsible for deoxidation in thermal power generation and high-pressure thermal systems. It is also a hybrid heater in the heat recovery system. Its main function is to remove oxygen and non-condensable gases from boiler feed water to ensure feed water quality and prevent equipment corrosion. If oxygen is dissolved in water, the metal in contact with water will be corroded. At the same time, if gas accumulates in the heat exchanger, the thermal resistance of heat transfer will increase and the heat transfer effect of the equipment will be reduced. Therefore, any gas dissolved in water is unfavorable, especially oxygen, which will directly threaten the safe operation of the equipment. Thermal deaerators are used in thermal power plants and other industrial processes to collect high-pressure water, non-condensable gases in high-pressure water, and non-condensable gases in condensed water into the deaerator. The non-condensable gases are discharged into the atmosphere through the thermal deaerator to achieve the effect of deoxidation. The exhausted steam discharged is mainly water vapor and heat.

[0003] Thermal deaerator uses heated steam to remove oxygen. According to the solubility characteristics of gases in water, if you want to remove any gas in water, you only need to remove the gas on the water surface. Therefore, it is hoped that all gases in water will be removed, and it is best to have only water vapor on the water surface without other gases. Thermal deaerator heats water to boiling point, reduces the solubility of oxygen and allows it to escape, and then removes the oxygen produced on the water surface to fill it with steam, so that oxygen in the water continuously escapes, and ensures that the oxygen content of the water meets the water quality standard requirements.

[0004] At present, the remaining steam after deoxygenation in most thermal deaerators is directly discharged, resulting in heat loss and waste of water resources.

[0005] A very small portion of the residual steam after deoxygenation in the thermal deaerator is recovered through another set of residual steam recovery equipment, which requires an additional set of thermal equipment system, with more equipment and large investment, while also increasing operating costs and a long payback period. In addition, the discharge of residual steam is extensive, with a large amount of excessive discharge, resulting in high energy consumption.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies in the prior art and thereby provide an automatic heat and mass recovery device for exhaust steam from thermal deoxidation. The present invention can automatically and accurately discharge exhaust steam and non-condensable gases according to the actual needs of system deoxidation, thereby ensuring efficient deoxidation of the thermal deaerator and achieving the effect of energy-saving and water-saving exhaust steam recovery.

[0008] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a thermal deoxidation exhaust steam heat and mass automatic recovery device, including a thermal deoxidizer, the top of the thermal deoxidizer is provided with an exhaust steam outlet and a condensate inlet, the bottom of the thermal deoxidizer is provided with a deoxygenated water outlet, the condensate inlet is connected to a main condensate mother pipe, and also includes an exhaust steam condensation separation heat exchanger, an exhaust steam condensate water tank and a PLC controller, the exhaust steam condensation separation heat exchanger, the exhaust steam condensate water tank and the thermal deoxidizer are arranged from top to bottom, and the top of the thermal deoxidizer is also provided with a exhaust steam outlet, a condensate water inlet is connected to a main condensate mother pipe, and a exhaust steam condensation separation heat exchanger, an exhaust steam condensate water tank and a PLC controller. A first pressure gauge is provided, a dissolved oxygen meter located under the water surface is provided inside the thermal deaerator, a waste steam inlet, a condensed water outlet, a non-condensable gas discharge port, a cooling water inlet, a cooling water outlet and a second pressure gauge are provided on the waste steam condensation separation heat exchanger, the waste steam outlet is connected to the waste steam inlet through a first waste steam discharge pipe, a first discharge amount electric control valve is provided on the first waste steam discharge pipe, a second waste steam discharge pipe connected to the atmosphere is installed at the non-condensable gas discharge port, and a second discharge amount electric control valve is provided on the second waste steam discharge pipe. Valve, the condensate outlet is connected with a condensate recovery pipe extending downward, the lower end of the condensate recovery pipe passes through the shell of the thermal deaerator and is inserted under the water surface inside the thermal deaerator, the condensate recovery pipe is sealed and welded to the shell of the thermal deaerator, a check valve is arranged at the lower end of the condensate recovery pipe, the exhaust steam condensate tank is installed on the condensate recovery pipe, a water level gauge is arranged in the exhaust steam condensate tank, and the PLC controller is respectively connected with the first pressure gauge, the dissolved oxygen meter, the second pressure gauge, the first discharge electric control valve, the second discharge electric control valve and the water level gauge signal; during normal operation, the PLC controller receives the dissolved oxygen signal of the dissolved oxygen meter to control the switch and opening size of the first discharge electric control valve, the PLC controller receives the water level signal of the water level gauge to control the switch of the second discharge electric control valve, and the PLC controller receives the signals of the first pressure gauge and the second pressure gauge to control the opening size of the second discharge electric control valve, so that the pressure value P1 of the first pressure gauge is greater than or equal to the pressure value P2 of the second pressure gauge and P1-P2≤0.1MPa.

[0009] Based on the above, the exhaust steam condensation separation heat exchanger includes an inner cylinder and an exhaust steam chamber. The inner cylinder is vertically arranged, the upper end of the inner cylinder is open and the lower end is sealed. The outer cylinder is welded on the outer circumference of the inner cylinder, and a cooling water annular cavity for cooling water is formed between the outer cylinder and the inner cylinder. An outer spiral guide plate is arranged in the cooling water annular cavity along the axial direction. The outer spiral guide plate forms a cooling water spiral heat exchange channel inside the cooling water annular cavity. The cooling water inlet is arranged on the upper part of the side wall of the outer cylinder and is connected with the upper end of the cooling water spiral heat exchange channel. The cooling water outlet is arranged on the lower part of the side wall of the outer cylinder and is connected with the lower end of the cooling water spiral heat exchange channel. The exhaust steam chamber is fixedly installed on the upper end of the inner cylinder concentrically, and a through hole corresponding to the upper port of the inner cylinder is opened at the bottom of the exhaust steam chamber. An inner liner is concentrically arranged inside the inner cylinder, and the condensed water outlet is arranged at the bottom center of the inner cylinder. The lower end of the inner liner is fixedly connected to the condensed water outlet. The upper end of the inner liner is flush with the upper end of the inner cylinder and is connected with the exhaust steam chamber. An exhaust steam annular cavity for exhaust steam is formed, and an inner spiral guide plate is arranged in the exhaust steam annular cavity along the axial direction. The inner spiral guide plate forms an exhaust steam spiral heat exchange channel inside the exhaust steam annular cavity. The upper end of the exhaust steam spiral heat exchange channel is communicated with the exhaust steam chamber. The exhaust steam inlet is arranged at the eccentric position of the bottom of the inner cylinder and is located in the exhaust steam annular cavity. The exhaust steam inlet is correspondingly connected to the lower end of the exhaust steam spiral heat exchange channel. The non-condensable gas discharge port and the first pressure gauge are respectively arranged at the top of the exhaust steam chamber. The inner wall of the inner cylinder is provided with a plurality of condensate guide grooves arranged in a circumferential array along the axial direction. The upper end of the condensate guide groove is located at the top of the exhaust steam spiral heat exchange channel, and the lower end of the condensate guide groove is located at the bottom of the exhaust steam spiral heat exchange channel. A plurality of confluence holes arranged in a circumferential array and radially corresponding to each condensate guide groove are provided on the outer circumference of the lower end of the inner liner pipe. The confluence holes are lower than the lower end of the condensate guide groove. A condensate confluence pipe is connected between the radially corresponding confluence holes and the lower end of the condensate guide groove.

[0010] Based on the above, the spiral directions of the outer spiral guide plate and the inner spiral guide plate are opposite.

[0011] Based on the above, a first main condensate branch pipe, a main condensate heater and a second main condensate branch pipe are arranged on the main condensate main pipe along the fluid flow direction; The other end of the first main condensate branch pipe is connected to the cooling water inlet, so as to pass part of the condensate as a refrigerant into the exhaust steam condensation separation heat exchanger through the cooling water inlet; The other end of the second main condensate branch pipe is connected to the cooling water outlet, which is used to return the condensate in the exhaust steam condensation separation heat exchanger to the main condensate main pipe after it flows out through the cooling water outlet and finally enters the thermal deaerator.

[0012] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the beneficial effects of the present invention are as follows: the dissolved oxygen content of condensed water in the thermal deaerator is measured by a dissolved oxygen meter, and the PLC controller controls the switch and opening size of the first discharge electric control valve according to the dissolved oxygen content signal of the dissolved oxygen meter, so that the automatic discharge of exhaust steam in the thermal deaerator can be realized, and the exhaust steam discharge of the thermal deaerator can be accurately controlled, so as to achieve the purpose of deoxygenation with the most favorable discharge amount and ensure efficient deoxygenation. The exhaust steam condensation separation heat exchanger can cool the water vapor in the exhaust steam discharged by the thermal deaerator into condensed water, so that the condensed water flows back to the thermal deaerator by gravity, and forms a water column and has a water level in the exhaust steam condensate water tank without condensation. The gas gathers in the exhaust steam chamber, and the PLC controller controls the switch of the second discharge electric control valve through the water level gauge signal in the exhaust steam condensate tank, and controls the opening size of the second discharge electric control valve according to the signals of the first pressure gauge and the second pressure gauge, so as to realize the automatic control discharge of non-condensable gas, and make the condensed water formed by the exhaust steam cooling automatically flow back to the thermal deaerator, so as to realize the recovery of water in the exhaust steam, and part of the condensed water is passed into the exhaust steam condensation separation heat exchanger through the cooling water inlet as a refrigerant to exchange heat with the exhaust steam, so as to absorb heat and heat up, so as to realize the early preheating of part of the condensed water and the heat recovery of the exhaust steam, and this part of the preheated condensed water can be quickly heated and deoxygenated when entering the thermal deaerator, thus saving heat. In summary, the present invention can realize the heat and mass recovery of the exhaust steam of the thermal deaerator without the energy consumption of the additional power system, thereby improving the economy of the thermal system and reducing losses, and the deoxygenation of the overall system is simple and efficient with less investment, low operating cost and short investment payback period.

[0013] The present invention can automatically and accurately discharge exhaust steam and non-condensable gases according to the actual needs of system deoxygenation, thereby ensuring efficient deoxygenation of the thermal deaerator and achieving the effect of energy-saving and water-saving recovery of exhaust steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a half-section schematic diagram of the exhaust steam condensation separation heat exchanger of the present invention.

[0016] Figure 3 yes Figure 2 In the AA section view, the outer spiral guide plate and the inner spiral guide plate are omitted.

[0017] In the figure: 1. Thermal deaerator; 2. Exhaust steam outlet; 3. Condensate water inlet; 4. Deoxygenated water outlet; 5. Main condensate jellyfish tube; 6. Exhaust steam condensation separation heat exchanger; 7. Exhaust steam condensate water tank; 8. PLC controller; 9. First pressure gauge; 10. Dissolved oxygen meter; 11. Exhaust steam inlet; 12. Cooling water inlet; 13. Cooling water outlet; 14. Second pressure gauge; 15. First exhaust steam discharge pipe; 16. First discharge electric control valve; 17. Second exhaust steam discharge pipe; 18. Two discharge electric control valves; 19. Condensate recovery pipe; 20. Check valve; 21. Water level gauge; 22. Inner tube; 23. Exhaust steam chamber; 24. Outer tube; 25. Cooling water annular cavity; 26. Outer spiral guide plate; 27. Through hole; 28. Inner lining pipe; 29. ​​Exhaust steam annular cavity; 30. Inner spiral guide plate; 31. Condensate guide groove; 32. Converging hole; 33. Condensate converging pipe; 34. First main condensate branch pipe; 35. Second main condensate branch pipe; 36. Main condensate heat exchanger. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0019] like Figure 1 , Figure 2 and Figure 3As shown, a thermal deoxidation exhaust steam heat and mass automatic recovery device comprises a thermal deoxidizer 1, a exhaust steam outlet 2 and a condensate inlet 3 are arranged at the top of the thermal deoxidizer 1, a deoxygenated water outlet 4 is arranged at the bottom of the thermal deoxidizer 1, the condensate inlet 3 is connected to a main condensate mother pipe 5, and also comprises an exhaust steam condensation separation heat exchanger 6, an exhaust steam condensate water tank 7 and a PLC controller 8, the exhaust steam condensation separation heat exchanger 6, the exhaust steam condensate water tank 7 and the thermal deoxidizer 1 are arranged from top to bottom, a first pressure gauge 9 is also arranged at the top of the thermal deoxidizer 1, and a position The dissolved oxygen meter 10 is disposed under the water surface. The exhaust steam condensation separation heat exchanger 6 is provided with an exhaust steam inlet 11, a condensed water outlet, a non-condensable gas discharge port, a cooling water inlet 12, a cooling water outlet 13 and a second pressure gauge 14. The exhaust steam outlet 2 is connected to the exhaust steam inlet 11 through a first exhaust steam discharge pipe 15. The first exhaust steam discharge pipe 15 is provided with a first discharge amount electric control valve 16. The non-condensable gas discharge port is provided with a second exhaust steam discharge pipe 17 connected to the atmosphere. The second exhaust steam discharge pipe 17 is provided with a second discharge amount electric control valve 18. The condensed water outlet is connected to a downward extending exhaust steam discharge pipe 16. The condensate recovery pipe 19 is extended, the lower end of the condensate recovery pipe 19 passes through the shell of the thermal deaerator 1 and is inserted under the water surface inside the thermal deaerator 1, the condensate recovery pipe 19 is sealed and welded with the shell of the thermal deaerator 1, and a check valve 20 is arranged at the lower end of the condensate recovery pipe 19. The exhaust steam condensate water tank 7 is installed on the condensate recovery pipe 19, and a water level gauge 21 is arranged in the exhaust steam condensate water tank 7. The PLC controller 8 is respectively connected to the first pressure gauge 9, the dissolved oxygen meter 10, the second pressure gauge 14, the first discharge amount electric control valve 16, the second discharge amount electric control valve 18 and The water level meter 21 signal is connected; during normal operation, the PLC controller 8 receives the dissolved oxygen signal from the dissolved oxygen meter 10 to control the switch and opening size of the first discharge electric control valve 16, the PLC controller 8 receives the water level signal from the water level meter 21 to control the switch of the second discharge electric control valve 18, and the PLC controller 8 receives the signals from the first pressure gauge 9 and the second pressure gauge 14 to control the opening size of the second discharge electric control valve 18, so that the pressure value P1 of the first pressure gauge 9 is greater than or equal to the pressure value P2 of the second pressure gauge 14 and P1-P2≤0.1MPa.

[0020] In this embodiment, the exhaust steam condensation separation heat exchanger 6 includes an inner cylinder 22 and an exhaust steam chamber 23. The inner cylinder 22 is vertically arranged, the upper end of the inner cylinder 22 is open, and the lower end is sealed. The outer cylinder 24 is welded on the outer circumference of the inner cylinder 22. A cooling water annular cavity 25 for passing cooling water is formed between the outer cylinder 24 and the inner cylinder 22. An outer spiral guide plate 26 is arranged in the axial direction of the cooling water annular cavity 25. The outer spiral guide plate 26 forms a cooling water spiral heat exchange channel inside the cooling water annular cavity 25. The cooling water inlet 12 is arranged on the upper part of the side wall of the outer cylinder 24 and is connected to the cooling water spiral heat exchange channel. The cooling water outlet 13 is arranged at the lower part of the side wall of the outer cylinder 24 and is connected with the lower end of the cooling water spiral heat exchange channel. The exhaust steam chamber 23 is fixedly installed at the upper end of the inner cylinder 22 concentrically. A through hole 27 corresponding to the upper port of the inner cylinder 22 is opened at the bottom of the exhaust steam chamber 23. An inner liner 28 is concentrically arranged inside the inner cylinder 22. The condensed water outlet is arranged at the bottom center of the inner cylinder 22. The lower end of the inner liner 28 is fixedly connected to the condensed water outlet. The upper end of the inner liner 28 is flush with the upper end of the inner cylinder 22 and is connected with the exhaust steam chamber 23. An exhaust steam annular cavity 29 for exhaust steam is formed between the inner tube 22 and the inner liner 28. An inner spiral guide plate 30 is arranged in the exhaust steam annular cavity 29 along the axial spiral. The inner spiral guide plate 30 forms an exhaust steam spiral heat exchange channel inside the exhaust steam annular cavity 29. The upper end of the exhaust steam spiral heat exchange channel is communicated with the exhaust steam chamber 23. The exhaust steam inlet 11 is arranged at the eccentric position of the bottom of the inner tube 22 and is located in the exhaust steam annular cavity 29. The exhaust steam inlet 11 is correspondingly communicated with the lower end of the exhaust steam spiral heat exchange channel. The non-condensable gas discharge port and the first pressure gauge 9 are respectively arranged at the top of the exhaust steam chamber 23. The inner tube 22 The inner wall of the exhaust steam condensation separation heat exchanger 6 is provided with six condensation water guide grooves 31 arranged in a circumferential array along the axial direction, the upper end of the condensation water guide groove 31 is located at the top of the exhaust steam spiral heat exchange channel, and the lower end of the condensation water guide groove 31 is located at the bottom of the exhaust steam spiral heat exchange channel. Six confluence holes 32 arranged in a circumferential array and corresponding to each condensation water guide groove 31 in a radial direction are provided on the outer circumference of the lower end of the inner liner pipe 28. The confluence holes 32 are lower than the lower end of the condensation water guide groove 31, and a condensation water confluence pipe 33 is connected between the radially corresponding confluence holes 32 and the lower end of the condensation water guide groove 31. The exhaust steam condensation separation heat exchanger 6 is made of corrosion-resistant metal material as a whole. In other embodiments, the condensation water guide groove 31 can also be provided with three, four, five, etc., and the number and position of the confluence holes 32 correspond to the condensation water guide groove 31.

[0021] In this embodiment, the spiral directions of the outer spiral guide plate 26 and the inner spiral guide plate 30 are opposite.

[0022] In this embodiment, the main condensate main pipe 5 is provided with a first main condensate branch pipe 34, a main condensate heater 36 and a second main condensate branch pipe 35 along the fluid flow direction; The other end of the first main condensate branch pipe 34 is connected to the cooling water inlet 12, and is used to pass part of the condensate as a refrigerant into the exhaust steam condensation separation heat exchanger 6 through the cooling water inlet 12; The other end of the second main condensate branch pipe 35 is connected to the cooling water outlet 13 , and is used to return the condensate in the exhaust steam condensation separation heat exchanger 6 to the main condensate main pipe 5 after flowing out through the cooling water outlet 13 and finally entering the thermal deaerator 1 .

[0023] The working principle of this embodiment is as follows: condensate flows through the main condensate main pipe 5, passes through the main condensate heater 36 for preheating, and then enters the thermal deaerator 1. At the same time, part of the condensate passes through the first main condensate branch pipe 34 and the cooling water inlet 12 to enter the exhaust steam condensation separation heat exchanger 6 as a refrigerant, and then flows out through the cooling water outlet 13 through the second main condensate branch pipe 35 to the main condensate main pipe 5, and finally enters the thermal deaerator 1. The thermal deaerator 1 works to heat and deoxygenate the condensate. The dissolved oxygen signal measured online and in real time by the dissolved oxygen meter 10 is transmitted to the PLC controller 8 and compared with the deviation value required by the dissolved oxygen standard. The deviation value is used as a signal for the PLC controller 8 to control the first discharge electric control valve 16. The PLC controller 8 controls the first discharge electric control valve 16 to open, so that the exhaust steam in the thermal deaerator 1 is discharged through the exhaust steam outlet 2, and controls the first discharge electric control valve 16 to open or close to accurately control the exhaust steam discharge in real time. The exhaust steam passes through the first The exhaust steam discharge pipe 15 and the exhaust steam inlet 11 enter the exhaust steam condensation separation heat exchanger 6, the exhaust steam flows through the exhaust steam spiral heat exchange channel at high speed from bottom to top, and part of the condensed water flows through the cooling water spiral heat exchange channel from top to bottom. The exhaust steam and the condensed water exchange heat in the exhaust steam condensation separation heat exchanger 6, the water vapor in the exhaust steam is cooled to condensed water and separated from the non-condensable gas in the exhaust steam, the separated non-condensable gas enters the exhaust steam chamber 23 and gathers, and the condensed water formed by the water vapor is thrown away by the centrifugal force of the spiral airflow. The condensed water flows down to the inner wall of the inner tube 22 and gathers in each condensed water guide groove 31 by its own weight. The condensed water then flows into the lower end of the inner liner 28 through each condensed water manifold 33 and enters the condensed water recovery pipe 19 through the condensed water outlet. The condensed water flows back to the thermal deaerator 1 through the condensed water recovery pipe 19. The condensed water in the exhaust steam condensation separation heat exchanger 6 absorbs heat and heats up, so it can be preheated in advance. This part of the preheated condensed water can quickly heat up and deoxidize when it enters the thermal deaerator 1, saving heat.The condensed water forms a water column in the condensed water recovery pipe 19 and has a water level in the exhaust steam condensed water tank 7. The water level gauge 21 measures the water level signal in real time and transmits it to the PLC controller 8. When the water level gauge 21 measures that the exhaust steam condensed water tank 7 is at a high water level, the PLC controller 8 controls the second discharge electric control valve 18 to close, and the non-condensable gas gathers in the exhaust steam chamber 23. The pressure in the exhaust steam chamber 23 rises and approaches the pressure in the thermal deaerator 1, that is, the pressure value P2 of the second pressure gauge 14 rises and approaches the pressure value P1 of the first pressure gauge 9. Then, the condensed water flows into the thermal deaerator 1 through the check valve 20 under its own weight, so that the condensed water is recovered to the thermal deaerator 1, and the water level in the exhaust steam condensed water tank 7 drops. When the water level gauge 21 measures that the exhaust steam condensate tank 7 is at a low water level, the PLC controller 8 controls the second discharge electric control valve 18 to open, and the non-condensable gas in the exhaust steam chamber 23 is discharged to the atmosphere through the non-condensable gas discharge port and the second exhaust steam discharge pipe 17. The PLC controller 8 receives the signal of the first pressure gauge 9 and the second pressure gauge 14, and controls the opening of the second discharge electric control valve 18 according to the pressure difference between the first pressure gauge 9 and the second pressure gauge 14, so that the pressure value P1 of the first pressure gauge 9 is greater than or equal to the pressure value P2 of the second pressure gauge 14 and P1-P2≤0.1MPa, so as to automatically adjust the discharge amount of non-condensable gas and ensure the safety and economy of the system. Therefore, through this device, it is possible to recycle all the heat energy and water in the exhaust steam discharged by the thermal deaerator 1 into the thermal deaerator 1, so as to achieve safe, economical, environmentally friendly and zero-emission operation. ;

[0024] The check valve 20 not only controls the discharge direction of the condensed water, but also prevents the water in the thermal deaerator 1 from flowing back into the exhaust steam condensation separation heat exchanger 6, thereby ensuring the safety of the system and the economical operation of the condensed water recovery.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A thermal deoxidation exhaust steam heat and mass automatic recovery device, comprising a thermal deoxidizer, a exhaust steam outlet and a condensate inlet are arranged at the top of the thermal deoxidizer, a deoxidized water outlet is arranged at the bottom of the thermal deoxidizer, and the condensate inlet is connected to a main condensate jellyfish pipe, characterized in that: It also includes a waste steam condensation separation heat exchanger, a waste steam condensation water tank and a PLC controller. The waste steam condensation separation heat exchanger, the waste steam condensation water tank and the thermal deaerator are arranged from top to bottom. A first pressure gauge is also provided on the top of the thermal deaerator. A dissolved oxygen meter located below the water surface is provided inside the thermal deaerator. A waste steam inlet, a condensate outlet, a non-condensable gas discharge port, a cooling water inlet, a cooling water outlet and a second pressure gauge are provided on the waste steam condensation separation heat exchanger. The waste steam outlet is connected to the waste steam inlet through a first waste steam discharge pipe. A first discharge electric control valve is provided on the first waste steam discharge pipe. A second waste steam discharge pipe connected to the atmosphere is installed at the non-condensable gas discharge port. A second discharge electric control valve is provided on the second waste steam discharge pipe. The condensate outlet is connected to a condensate recovery pipe extending downward. The lower end of the condensate recovery pipe passes through the outer shell of the thermal deaerator and is inserted into the thermal deaerator. Under the water surface of the part, the condensate recovery pipe is seal-welded to the shell of the thermal deaerator, a check valve is arranged at the lower end of the condensate recovery pipe, the exhaust steam condensate water tank is installed on the condensate recovery pipe, a water level gauge is arranged in the exhaust steam condensate water tank, and the PLC controller is respectively connected with the first pressure gauge, the dissolved oxygen meter, the second pressure gauge, the first discharge electric control valve, the second discharge electric control valve and the water level gauge signal; during normal operation, the PLC controller receives the dissolved oxygen signal of the dissolved oxygen meter to control the switch and opening size of the first discharge electric control valve, the PLC controller receives the water level signal of the water level gauge to control the switch of the second discharge electric control valve, and the PLC controller receives the signals of the first pressure gauge and the second pressure gauge to control the opening size of the second discharge electric control valve, so that the pressure value P1 of the first pressure gauge is greater than or equal to the pressure value P2 of the second pressure gauge and P1-P2≤0.1MPa.

2. The automatic heat and mass recovery device for exhaust steam from thermal deoxidation according to claim 1 is characterized in that: The exhaust steam condensation separation heat exchanger includes an inner cylinder and an exhaust steam chamber. The inner cylinder is vertically arranged, the upper end of the inner cylinder is open and the lower end is sealed. The outer cylinder is welded on the outer circumference of the inner cylinder, and a cooling water annular cavity for cooling water is formed between the outer cylinder and the inner cylinder. An outer spiral guide plate is arranged in the cooling water annular cavity along the axial direction. The outer spiral guide plate forms a cooling water spiral heat exchange channel inside the cooling water annular cavity. The cooling water inlet is arranged on the upper part of the side wall of the outer cylinder and is connected with the upper end of the cooling water spiral heat exchange channel. The cooling water outlet is arranged on the lower part of the side wall of the outer cylinder and is connected with the lower end of the cooling water spiral heat exchange channel. The exhaust steam chamber is fixedly installed on the upper end of the inner cylinder concentrically, and a through hole corresponding to the upper port of the inner cylinder is opened at the bottom of the exhaust steam chamber. An inner liner is concentrically arranged inside the inner cylinder, and the condensed water outlet is arranged at the bottom center of the inner cylinder. The lower end of the inner liner is fixedly connected to the condensed water outlet. The upper end of the inner liner is flush with the upper end of the inner cylinder and is connected with the exhaust steam chamber. A cooling water inlet is arranged on the upper part of the side wall of the outer cylinder and is connected with the upper end of the cooling water spiral heat exchange channel. The cooling water outlet is arranged on the lower part of the side wall of the outer cylinder and is connected with the lower end of the cooling water spiral heat exchange channel. The exhaust steam chamber is fixedly installed on the upper end of the inner cylinder concentrically, and a through hole corresponding to the upper port of the inner cylinder is opened at the bottom of the exhaust steam chamber. An inner liner is concentrically arranged inside the inner cylinder, and the condensed water outlet is arranged at the bottom center of the inner cylinder. The lower end of the inner liner is fixedly connected to the condensed water outlet. The upper end of the inner liner is flush with the upper end of the inner cylinder and is connected with the exhaust steam chamber. An exhaust steam annular cavity for exhaust steam is provided, and an inner spiral guide plate is arranged in the exhaust steam annular cavity along the axial direction. The inner spiral guide plate forms an exhaust steam spiral heat exchange channel inside the exhaust steam annular cavity. The upper end of the exhaust steam spiral heat exchange channel is communicated with the exhaust steam chamber. The exhaust steam inlet is arranged at the eccentric position of the bottom of the inner cylinder and is located in the exhaust steam annular cavity. The exhaust steam inlet is correspondingly connected to the lower end of the exhaust steam spiral heat exchange channel. The non-condensable gas discharge port and the first pressure gauge are respectively arranged at the top of the exhaust steam chamber. The inner wall of the inner cylinder is provided with a plurality of condensate guide grooves arranged in a circumferential array along the axial direction. The upper end of the condensate guide groove is located at the top of the exhaust steam spiral heat exchange channel, and the lower end of the condensate guide groove is located at the bottom of the exhaust steam spiral heat exchange channel. A plurality of confluence holes arranged in a circumferential array and radially corresponding to each condensate guide groove are provided on the outer circumference of the lower end of the inner liner pipe. The confluence holes are lower than the lower end of the condensate guide groove. A condensate confluence pipe is connected between the radially corresponding confluence holes and the lower end of the condensate guide groove.

3. The automatic heat and mass recovery device for exhaust steam from thermal deoxidation according to claim 2 is characterized in that: The spiral directions of the outer spiral guide plate and the inner spiral guide plate are opposite.

4. The automatic heat and mass recovery device for exhaust steam from thermal deoxidation according to any one of claims 1 to 3, characterized in that: The main condensate main pipe is provided with a first main condensate branch pipe, a main condensate heater and a second main condensate branch pipe along the fluid flow direction; The other end of the first main condensate branch pipe is connected to the cooling water inlet, so as to pass part of the condensate as a refrigerant into the exhaust steam condensation separation heat exchanger through the cooling water inlet; The other end of the second main condensate branch pipe is connected to the cooling water outlet, which is used to return the condensate in the exhaust steam condensation separation heat exchanger to the main condensate main pipe after it flows out through the cooling water outlet and finally enters the thermal deaerator.

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