Evaporation cooling system of heating furnace

Abstract

The invention belongs to the technical field of heating furnace waste heat recovery, and relates to a heating furnace evaporative cooling system which comprises a water tank, a motor make-up pump, a deaerator, a motor feed pump, a steam pocket, an intelligent circulating water pump station, a heating furnace water beam and a sewage recovery device which are connected through pipelines. The steam pocket is provided with a deoxygenated water inlet, a circulating water inlet, a circulating water outlet, a steam outlet and a sewage outlet; the intelligent circulating water pump station comprises a motor circulating pump and a diesel generator pump which are arranged in parallel through a pipeline, an inlet of the intelligent circulating water pump station is connected with a circulating water outlet of the steam pocket, an outlet is connected with a water inlet of the heating furnace water beam, and a water outlet of the heating furnace water beam is connected with a circulating water inlet of the steam pocket; the diesel generator pump comprises a diesel engine circulating pump head, a generator and a diesel engine which are coaxially arranged, and the diesel engine is in transmission connection with the diesel engine circulating pump head and the generator. And an inlet of the sewage recovery device is connected with a sewage outlet of the steam pocket.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery of heating furnaces, and relates to a vaporization cooling system for heating furnaces. Background Art

[0002] The vaporization cooling technology of heating furnaces is the most commonly used technology for cooling the water beams of walking beam type heating furnaces at present. It has the advantages of less water consumption, long service life of water beams, and generation of recoverable steam. As Figure 1 shown, it is a layout schematic diagram of an existing vaporization cooling system for heating furnaces. The working process of this system is as follows: Make-up water (soft water or demineralized water) from the plant network enters the make-up water tank 1, is boosted by the motor make-up water pump 2 and then sent to the atmospheric thermal deaerator 3 for deaeration. The deaerated make-up water is boosted by the motor feed water pump 4 or diesel engine feed water pump 5 and sent into the steam drum 6, where it is mixed with the circulating water in the steam drum 6. The mixed circulating water is boosted by the motor circulating pump 7 or diesel engine circulating pump 8 and then sent to the heating furnace water beam 9 to cool the heating furnace water beam 9. The circulating water itself is heated to become a steam-water mixture and reaches the steam drum 6 through a pipeline. In the steam drum 6, steam-water separation is carried out. The separated water continues to circulate through the motor circulating pump 7 or diesel engine circulating pump 8. Part of the separated steam is sent to the plant steam network, and the other part is sent to the atmospheric thermal deaerator 3 to heat the make-up water. The blowdown water of the steam drum 6 is depressurized, cooled, and expanded through a regular blowdown flash tank 14 to generate secondary steam and hot water. The secondary steam is discharged to the atmosphere through the exhaust port at the top of the regular blowdown flash tank 14, and the hot water is discharged to the dirty water pipe network from the bottom of the regular blowdown flash tank 14 after being cooled by mixing with cooling water. In addition, an emergency pipeline is provided between the make-up water tank 1 and the diesel engine feed water pump 5. When there is a power outage in the plant area, the water in the make-up water tank 1 directly supplies water to the steam drum through the diesel engine feed water pump 5 without passing through the deaerator.

[0003] The existing vaporization cooling system for heating furnaces mainly has the following disadvantages:

[0004] 1. Large floor area. In order to ensure the safe operation of the system during a power outage in the plant area, the system is equipped with 2 sets of emergency diesel pumps - the diesel engine feed water pump and the diesel engine circulating pump, which increases the floor area.

[0005] 2. Poor energy efficiency. This is mainly reflected in two aspects. One is that the motor circulating pump 7 often uses a fixed-frequency pump, and when the system load demand changes, the electric circulating pump cannot operate under high energy efficiency conditions. The other is that the heat of the blowdown water of the steam drum is not recovered. Part of it is discharged into the atmosphere along with the secondary steam generated by the regular blowdown flash tank, and the other part enters the dirty water pipe network along with the blowdown water of the flash tank.

[0006] 3. Waste of water source. The secondary steam generated by the regular blowdown flash tank 14 of some boiler drums is discharged into the atmosphere, resulting in water loss. In addition, in order to make the blowdown meet the sewage discharge standard, cooling water needs to be added. The cooling water and the blowdown enter the turbidity loop water supply network together, causing loss of cooling water.

[0007] 4. Short service life. When the power supply is cut off in the plant area, the makeup water of the makeup water tank is directly sent to the boiler drum through the diesel engine feed pump. Since the makeup water is not deaerated at this time, it is easy to cause oxygen corrosion of the equipment and pipelines in the system, thus affecting the service life of the system. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a heating furnace vaporization cooling system to solve the technical problems proposed in the background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A heating furnace vaporization cooling system includes a water tank, an electric motor makeup water pump, a deaerator, an electric motor feed pump, a boiler drum, an intelligent circulating water pump station, a heating furnace water beam, and a blowdown recovery device connected by pipelines;

[0011] The boiler drum has a deaerated water inlet, a circulating water inlet, a circulating water outlet, a steam outlet, and a blowdown outlet;

[0012] The intelligent circulating water pump station includes an electric motor circulating pump and a diesel generator pump arranged in parallel through pipelines. The inlet of the intelligent circulating water pump station is connected to the circulating water outlet of the boiler drum, and the outlet is connected to the water inlet of the heating furnace water beam. The water outlet of the heating furnace water beam is connected to the circulating water inlet of the boiler drum;

[0013] The diesel generator pump includes a diesel engine circulating pump head, a generator, and a diesel engine arranged coaxially. The diesel engine is respectively drivingly connected to the diesel engine circulating pump head and the generator;

[0014] The inlet of the blowdown recovery device is connected to the blowdown outlet of the boiler drum.

[0015] Further, in the intelligent circulating water pump station, a first pressure gauge is provided at the inlet of the pipeline, a second pressure gauge and a flow meter are provided at the outlet, and a regulating valve is provided;

[0016] It further includes a control cabinet, which is respectively connected to the diesel engine, the generator, the regulating valve, the first pressure gauge, the second pressure gauge, and the flow meter through cables to receive the information of the first pressure gauge, the second pressure gauge, and the flow meter, control the diesel engine and the regulating valve, and receive the power of the generator.

[0017] Further, the control cabinet is also provided with a cable connecting the motor makeup water pump and the motor feed water pump to supply power to the motor makeup water pump and the motor feed water pump.

[0018] Further, the sewage recovery device includes a cavity, in which a first heat insulation plate and a second heat insulation plate are provided, dividing the cavity into chamber A, chamber B and chamber C;

[0019] A first sewage inlet, a first sewage outlet and a steam outlet are arranged on chamber A. The first sewage inlet is connected to the sewage outlet of the steam drum, and a first water inlet distributor and a steam-water separation device are arranged therein; the steam outlet is arranged at the top of chamber A, and the steam-water separation device is arranged below the steam outlet;

[0020] A second sewage inlet, an exhaust port, a first cooling water inlet and a first cooling water outlet are arranged on chamber B, and a second water inlet distributor and a steam cooler are arranged therein; the first sewage outlet is connected to the second water inlet distributor through a first connecting pipe;

[0021] Chamber C is located below chamber B and is separated by a second heat insulation plate. A communication hole is provided on the second heat insulation plate; a second sewage outlet, a second cooling water inlet and a second cooling water outlet are provided on chamber C, and a hot water cooler is arranged therein.

[0022] Further, a first control valve is provided on the steam outlet to control the pressure in chamber A.

[0023] Further, a second control valve is provided on the first connecting pipe to control the liquid level in chamber A.

[0024] Further, the first cooling water inlet is connected to the water outlet of the motor makeup water pump, and the first cooling water outlet is connected to the water inlet of the deaerator; the second cooling water outlet is connected to the first cooling water inlet through a second connecting pipe.

[0025] Further, the steam cooler in chamber B and the hot water cooler in chamber C adopt a shell-and-tube heat exchange with the cooling water.

[0026] Further, the motor circulating pump includes a first motor circulating pump and a second motor circulating pump. The first motor circulating pump and the second motor circulating pump are arranged in parallel through a connecting pipe, with one operating and the other in standby.

[0027] Further, the motor makeup water pump includes two makeup water pumps arranged in parallel through a pipe, and the motor feed water pump includes two feed water pumps arranged in parallel through a pipe.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. The vaporization cooling system of this heating furnace demonstrates remarkable innovation and practicality through the integrated design of an intelligent circulating pump station and a sewage recovery device. The system eliminates the traditional diesel engine feed pump and the pipeline from the makeup water tank to the inlet of the feed pump, replacing them with a parallel configuration of motor circulating pumps and diesel generator pumps. This design not only significantly reduces the floor area and optimizes the equipment layout but also ensures the stable supply of circulating water by providing emergency power and electricity through the diesel generator pump during power outages. This innovative structure simplifies the system complexity and improves the space utilization rate, making it particularly suitable for industrial application scenarios with demanding site requirements, embodying the characteristics of high-efficiency integration and practicality.

[0030] 2. The energy-saving and environmental protection advantages of the system are particularly prominent. The intelligent circulating pump station is equipped with variable-frequency motor circulating pumps, which can adjust the operating frequency in real time according to the system load demand, effectively reducing energy consumption and achieving energy-saving operation. At the same time, the sewage recovery device completely recovers and utilizes the blowdown water from the steam drum through multi-stage flash evaporation technology: a part of the steam generated by flash evaporation re-enters the system cycle through the deaerator, and the other part enters the dirty water pipe network after cooling, avoiding the impact of sewage discharge on the environment. More importantly, the system uses boiler make-up water as the cooling medium without the need for external cooling water supply, which not only reduces additional resource consumption but also improves the water resource utilization efficiency. This design fully embodies the concept of energy conservation and green environmental protection and has significant practical value.

[0031] 3. This system performs excellently in terms of reliability and durability, especially showing advantages when dealing with emergencies. When a power outage occurs in the factory area, the diesel generator pump starts quickly, not only maintaining the operation of the circulating water system but also supplying power to the makeup water pump and the feed pump to ensure that the steam drum continuously receives deaerated water. This mechanism effectively reduces the oxygen corrosion of equipment and pipelines and significantly extends the service life of the system. In addition, the sewage recovery device further protects the equipment and improves the overall thermal efficiency of the system through efficient heat recovery and cooling treatment. This design that takes into account both reliability and economy not only enhances the stability of the system but also provides guarantee for long-term operation, highlighting the perfect combination of its innovation and practicality.

[0032] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. Brief Description of the Drawings

[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0034] Figure 1It is a schematic layout diagram of an existing vaporization cooling system for a heating furnace;

[0035] Figure 2 It is a schematic layout diagram of a vaporization cooling system for a heating furnace in an embodiment;

[0036] Figure 3 It is a schematic layout diagram of an intelligent circulating water pump station in an embodiment;

[0037] Figure 4 It is a schematic layout diagram of a sewage recovery device in an embodiment.

[0038] Reference numerals: make-up water tank 1, motor make-up water pump 2, deaerator 3, motor feed water pump 4, diesel engine feed water pump 5, steam drum 6, motor circulating pump 7, diesel engine circulating pump 8, heating furnace water beam 9, intelligent circulating water pump station 10, sewage recovery device 11, pipeline 12, cable 13, regular blowdown flash tank 14;

[0039] Intelligent circulating water pump station 10: first motor circulating pump 1011, second motor circulating pump 1012, diesel engine circulating pump head 102, generator 103, diesel engine 104, regulating valve 105, first pressure gauge 1061, second pressure gauge 1062, flow meter 1063, control cabinet 107;

[0040] Sewage recovery device 11: first control valve 111, first connecting pipeline 112, second control valve 113, second connecting pipeline 114, first heat insulation plate 115, second heat insulation plate 116, communication hole 1161, cavity 117, first sewage inlet 1111, first sewage outlet 1112, steam outlet 1113, first water inlet distributor 1114, steam-water separation device 1115, second sewage inlet 1121, exhaust port 1122, first cooling water inlet 1123, first cooling water outlet 1124, second water inlet distributor 1125, steam cooler 1126, second sewage outlet 1131, second cooling water inlet 1132, second cooling water outlet 1133, hot water cooler 1134. Detailed implementation manners

[0041] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following examples only schematically illustrate the basic concept of the present invention. Without conflict, the following examples and the features in the examples can be combined with each other.

[0042] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation on the present invention; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0043] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] Embodiment 1

[0045] Please refer to Figures 2 to 4 , which is a vaporization cooling system for a heating furnace, including a water tank 1, a motor make-up water pump 2, a deaerator 3, a motor feed water pump 4, a steam drum 6, an intelligent circulating pump station 10, a heating furnace water beam 9, and a sewage recovery device 11 connected by a pipeline 12. The steam drum 6 has a deaerated water inlet, a circulating water inlet, a circulating water outlet, a steam outlet, and a sewage outlet;

[0046] The key lies in that the intelligent circulating pump station 10 includes a first motor circulating pump 1011, a second motor circulating pump 1012, and a diesel generator pump arranged in parallel through a pipeline 12. A first pressure gauge 1061 is provided at the inlet of the pipeline 12 to monitor the inlet pressure of the pump station; (usually 1 of the first motor circulating pump 1011 and the second motor circulating pump 1012 operates, and 1 is in standby)

[0047] A second pressure gauge 1062 and a flow meter 1063 are provided at the outlet of the pipeline 12 to monitor the outlet pressure and flow rate of the pump station, and a regulating valve 105 is provided at the outlet to adjust the circulating water flow rate sent out by the pump station; and the inlet of the intelligent circulating pump station 10 is connected to the circulating water outlet of the steam drum 6, the outlet of the intelligent circulating pump station 10 is connected to the water inlet of the heating furnace water beam 9, and the water outlet of the heating furnace water beam 9 is connected to the circulating water inlet of the steam drum 6;

[0048] The diesel generator pump includes a diesel engine circulation pump head 102, a generator 103, and a diesel engine 104 that are coaxially arranged. The diesel engine circulation pump head 102 is connected to a pipeline 12, and the diesel engine 104 is respectively drivingly connected to the diesel engine circulation pump head 102 and the generator 103 to provide power for the diesel engine circulation pump head 102 and the generator 103.

[0049] Further, this embodiment further includes a control cabinet 107. The control cabinet 107 is respectively connected to the diesel engine 104, the generator 103, a regulating valve 105, a first pressure gauge 1061, a second pressure gauge 1062, and a flow meter 1063 through a cable 13, receives information from the first pressure gauge 1061, the second pressure gauge 1062, and the flow meter 1063, controls the diesel engine 104 and the regulating valve 105, and receives the power of the generator 103.

[0050] Further, the control cabinet 107 is also provided with a cable 13 connecting a motor make-up water pump 2 and a motor feed water pump 4 to supply power to the motor make-up water pump 2 and the motor feed water pump 4.

[0051] Specifically, the control cabinet 107 is composed of a box body, a control circuit, electrical components (such as a PLC), and an operation display component (such as a touch screen), etc. The control cabinet 107 is used to receive manual input information and signals from the first pressure gauge 1061, the second pressure gauge 1062, and the flow meter 1063, control the start and stop of the diesel engine 104 (and thus control the start and stop of the diesel engine circulation pump head 102), the opening degree of the regulating valve 105, and the voltage, frequency, power, etc. of the external power supply of the generator 103.

[0052] When a power outage occurs in the factory area, the diesel generator pump immediately starts to operate. The diesel engine 104 operates to drive the diesel engine circulation pump head 102 to provide power for the circulating water system; at the same time, it also drives the generator 103 to supply power externally for equipment that must operate during a system power outage (such as an electric feed water pump, etc.).

[0053] The sewage recycling device 11 includes a cavity 117. A first heat insulation plate 115 and a second heat insulation plate 116 are provided in the cavity 117 to divide the cavity 117 into three chambers, namely chamber A, chamber B, and chamber C.

[0054] A first sewage inlet 1111, a first sewage outlet 1112 and a steam outlet 1113 are arranged on the chamber A. The first sewage inlet 1111 is connected to the sewage discharge outlet of the steam drum 6, and a first water inlet distributor 1114 and a steam-water separation device 1115 are arranged therein. The sewage inlet 1111 is connected to the first water inlet distributor 1114, so that high-temperature sewage discharge water enters the first water inlet distributor 1114 through the sewage inlet 1111. After being evenly distributed by the first water inlet distributor 1114, flashing occurs in the chamber A to generate primary flashing steam and medium-temperature hot water;

[0055] The steam outlet 1113 is arranged at the top of the chamber A, and the steam-water separation device 1115 is arranged below the steam outlet 1113, so that the primary flashing steam passes through the steam-water separation device 1115 and is discharged through the steam outlet 1113 at the top of the chamber A and enters the deaerator 3 and / or the plant steam pipe network;

[0056] A second sewage inlet 1121, an exhaust port 1122, a first cooling water inlet 1123 and a first cooling water outlet 1124 are arranged on the chamber B, and a second water inlet distributor 1125 and a steam cooler 1126 are arranged in the chamber B. The first cooling water inlet 1123 and the first cooling water outlet 1124 are respectively connected to the cooling water inlet and the cooling water outlet of the steam cooler 1126.

[0057] The first sewage outlet 1112 is arranged at the bottom of the chamber A. The first sewage outlet 1112 passes through the second sewage inlet 1121 through the first connecting pipe 112 and is connected to the second water inlet distributor 1125, so that the medium-temperature hot water in the chamber A enters the chamber B through the first connecting pipe 112 for secondary flashing to generate secondary flashing steam and sub-medium-temperature hot water;

[0058] The sub-medium-temperature hot water accumulates at the bottom of the chamber B, and the secondary flashing steam is cooled into hot water and recovered through the steam cooler 1126 arranged at the top of the chamber B and drops into the sub-medium-temperature hot water at the bottom of the chamber B.

[0059] The chamber C is located below the chamber B. The chamber C and the chamber B are separated by a second heat insulation plate 116, and a communication hole 1161 is provided on the second heat insulation plate 116, so that the sub-medium-temperature hot water at the bottom of the chamber B flows into the chamber C through the communication hole 1161 in the second heat insulation plate 116; some non-condensable gases in the chamber B are discharged into the atmosphere through the exhaust port 1122 arranged at the top of the chamber B.

[0060] A second sewage outlet 1131, a second cooling water inlet 1132 and a second cooling water outlet 1133 are provided on the chamber C, and a hot water cooler 1134 is arranged therein;

[0061] The sub-medium temperature hot water generated in chamber B enters chamber C through the communication holes 1161 in the second heat insulation plate 116, and is cooled into low-temperature hot water by the hot water cooler 1134, reaching the discharge condition. Then it is discharged into the sewage system through the sewage outlet 1131 arranged at the bottom of chamber C. The second cooling water inlet 1132 and the second cooling water outlet 1133 are respectively connected to the inlet and outlet of the hot water cooler 1134. And the second cooling water outlet 1133 is connected to the first cooling water inlet 1123 through the second connecting pipe 114;

[0062] The steam cooler 1126 in chamber B and the hot water cooler 1134 in chamber C adopt a wall-type heat exchange with cooling water, and the cooling water uses boiler make-up water. The normal-temperature boiler make-up water first enters the hot water cooler 1134 in chamber C through the second cooling water inlet 1132 to absorb the heat of the sub-medium temperature hot water in chamber C to make the blowdown water reach the discharge condition, and then enters the steam cooler 1126 in chamber B through the second cooling water outlet 1133, the second connecting pipe 114 and the first cooling water inlet 1123 to absorb the heat of the secondary flash steam in chamber B to condense the flash steam into hot water for recovery. Finally, after being discharged through the first cooling water outlet 1124, it enters the boiler deaerator, and the absorbed heat is recycled.

[0063] The first cooling water inlet 1123 is connected to the water outlet of the motor make-up water pump 2, and the first cooling water outlet 1124 is connected to the water inlet of the deaerator 3, so as to preheat the make-up water sent to the deaerator 3 and at the same time be able to cool the blowdown water of the steam drum.

[0064] The working principle of the vaporization cooling system of this heating furnace is as follows:

[0065] The make-up water (soft water or demineralized water) from the plant make-up water pipe network enters the make-up water tank 1, is boosted by the motor make-up water pump 2, and first passes through the blowdown water recovery device 8 to cool the blowdown water of the steam drum, and at the same time the make-up water itself is heated and then sent to the deaerator 3 for deaeration;

[0066] The deaerated make-up water becomes deaerated water, is boosted by the motor feed water pump 4, and then sent into the steam drum 6, where it is mixed with the circulating water in the steam drum 6. The mixed circulating water is boosted by the intelligent circulating water pump station 10 and then sent to the heating furnace water beam 9 to cool the heating furnace water beam 9. The circulating water itself is heated into a steam-water mixture and enters the steam drum 6 for steam-water separation. The separated water continues to circulate through the intelligent circulating water pump station 10 as circulating water, and a part of the separated steam is sent to the plant steam pipe network, and the other part reaches the deaerator 3 upward to heat and deaerate the make-up water.

[0067] To ensure the water quality of the system, blowdown of the steam drum 6 is required. The blowdown water from the steam drum enters the blowdown water recovery device 11 to generate steam and hot water. The steam generated by the blowdown water recovery device 11 is sent to the deaerator 3 for deaeration use. After the hot water absorbs heat through the makeup water supplied by the motor makeup water pump 2, it reaches the discharge standard and enters the dirty circulating water pipeline for recovery. In addition, there is a small amount of non-condensable gas in the blowdown water of the steam drum, which can be discharged into the atmosphere through the exhaust port 1122 at the top of the blowdown water recovery device 11.

[0068] When a power outage occurs in the plant area, the diesel engine 104 of the intelligent circulating water pump station 10 will start immediately. It drives the diesel engine circulating pump head 102 of itself to operate and continue to provide power for the circulating water to ensure the safe operation of the system. At the same time, it also provides power for the motor makeup water pump 2, the motor feed water pump 4, etc., so that the steam drum 6 has a qualified supply of deaerated water, thereby avoiding oxygen corrosion of the equipment and pipelines in the system. At the same time, it can reduce the layout of the diesel engine feed water pump 5 to save costs.

[0069] Embodiment 2

[0070] Based on Embodiment 1, in this embodiment, a first control valve 111 is provided on the steam outlet 1113 to control the pressure in chamber A so that the flash steam meets the pressure requirements of the deaerator.

[0071] Furthermore, a second control valve 113 is provided on the first connection pipe 112 to control the liquid level in chamber A.

[0072] This embodiment provides an operation method for recovering blowdown water using the above-mentioned blowdown water recovery device 11, demonstrating the energy-saving and environmental protection advantages of the device through specific operation steps.

[0073] The operation steps are as follows:

[0074] 1. Introduce high-temperature blowdown water:

[0075] Introduce the high-temperature blowdown water generated by the boiler into chamber A through the first sewage inlet 1111;

[0076] 2. Flash evaporation and separation in chamber A:

[0077] After the high-temperature blowdown water is evenly distributed through the first water inlet distributor 1114, flash evaporation occurs in chamber A to generate primary flash steam and medium-temperature hot water.

[0078] After the primary flash steam is separated by the steam-water separation device 1115, it is discharged through the steam outlet 1113 and sent to the boiler deaerator; and the pressure in chamber A is adjusted through the first control valve 111 to ensure that the steam meets the requirements of the boiler deaerator.

[0079] Medium-temperature hot water flows into chamber B through the first connecting pipe 112, and the second control valve 113 adjusts the liquid level in chamber A.

[0080] 3. Re-flashing and cooling in chamber B:

[0081] After being distributed by the second water inlet distributor 1125, the medium-temperature hot water re-flashes in chamber B, generating secondary flash steam and sub-medium-temperature hot water.

[0082] The secondary flash steam is cooled by the cooling water in the steam cooler 1126, condenses into hot water and falls to the bottom of chamber B, and the non-condensable gas is discharged into the atmosphere through the exhaust port 1122.

[0083] The sub-medium-temperature hot water flows into chamber C through the communication hole 1161 in the second heat insulation plate 116.

[0084] 4. Final cooling and discharge in chamber C:

[0085] The sub-medium-temperature hot water is further cooled to the discharge temperature by the cooling water in the hot water cooler 1134.

[0086] The cooled low-temperature hot water is discharged into the sewage system through the sewage outlet 1131.

[0087] 5. Recycling of cooling water:

[0088] The make-up water for the boiler is used as cooling water. First, it enters the hot water cooler 1134 in chamber C through the second cooling water inlet 1132 to absorb the heat of the sub-medium-temperature hot water in chamber C, making the sewage reach the discharge condition and preheating the cooling water.

[0089] The preheated cooling water flows out from the second cooling water outlet 1133, passes through the second connecting pipe 114 and the first cooling water inlet 1123, and enters the steam cooler 1126 in chamber B to absorb the heat of the secondary flash steam, obtaining the heated cooling water.

[0090] The heated cooling water flows out from the first cooling water outlet 1124 and enters the boiler deaerator to realize heat recovery.

[0091] Embodiment 3

[0092] In this embodiment, the second motor circulation pump 1012 is cancelled, and only the first motor circulation pump 1011 and the diesel generator pump arranged in parallel through the connecting pipe 12 are retained, and the control cabinet 107 is also connected to the first motor circulation pump 1011 through the cable 13 to control the operation of the first motor circulation pump 1011.

[0093] Moreover, the first motor-driven circulating pump 1011 is a variable-frequency pump, which provides power for the circulating water system. When the load demand of the circulating water system changes, the power of the first motor-driven circulating pump 1011 can be controlled by frequency conversion to achieve the purpose of energy conservation.

[0094] In this embodiment, the motor-driven make-up water pump 2 includes two make-up water pumps arranged in parallel through a pipeline 12 to achieve one in use and one in reserve; the motor-driven feed water pump 4 includes two feed water pumps arranged in parallel through a pipeline 12 to achieve one in use and one in reserve.

[0095] Furthermore, both the make-up water pump and the feed water pump are set as variable-frequency pumps. When the make-up water load or the feed water load demand changes, the power of the make-up water pump and the feed water pump can be controlled by frequency conversion to achieve the purpose of energy conservation.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A vaporization cooling system for a heating furnace, characterized in that: It includes a water tank, a motor water supply pump, a deaerator, a motor water supply pump, a steam drum, an intelligent circulating water pump station, a heating furnace water beam and a sewage recovery device connected by pipelines; The steam drum has a deoxygenated water inlet, a circulating water inlet, a circulating water outlet, a steam outlet and a sewage outlet; The intelligent circulating water pump station comprises an electric motor circulating pump and a diesel generator pump arranged in parallel through a pipeline, the inlet of the intelligent circulating water pump station is connected to the circulating water outlet of the drum, the outlet is connected to the water inlet of the heating furnace water beam, and the water outlet of the heating furnace water beam is connected to the circulating water inlet of the drum; The diesel generator pump comprises a coaxially arranged diesel engine circulating pump head, a generator and a diesel engine, wherein the diesel engine is respectively connected to the diesel engine circulating pump head and the generator by transmission; The inlet of the wastewater recovery device is connected to the wastewater outlet of the drum.

2. The vaporization cooling system of the heating furnace according to claim 1, characterized in that: In the intelligent circulating water pump station, a first pressure gauge is provided at the inlet of the pipeline, a second pressure gauge and a flow meter are provided at the outlet, and a regulating valve is provided; It also includes a control cabinet, which is connected to the diesel engine, the generator, the regulating valve, the first pressure gauge, the second pressure gauge and the flow meter through cables to receive information from the first pressure gauge, the second pressure gauge and the flow meter, control the diesel engine and the regulating valve, and receive electricity from the generator.

3. The heating furnace vaporization cooling system according to claim 2, characterized in that: The control cabinet is also provided with a cable connecting the motor water replenishment pump and the motor water feed pump to transmit electricity to the motor water replenishment pump and the motor water feed pump.

4. The heating furnace vaporization cooling system according to claim 1, wherein: The sewage recovery device comprises a cavity, in which a first heat insulation board and a second heat insulation board are arranged, dividing the cavity into chamber A, chamber B and chamber C; The chamber A is provided with a first sewage inlet, a first sewage outlet and a steam outlet. The first sewage inlet is connected to the sewage outlet of the drum, and a first water inlet distributor and a steam-water separation device are arranged therein; the steam outlet is arranged at the top of the chamber A, and the steam-water separation device is arranged at the bottom of the steam outlet; The chamber B is provided with a second sewage inlet, an exhaust port, a first cooling water inlet and a first cooling water outlet, and a second water inlet distributor and a steam cooler are arranged therein; the first sewage outlet is connected to the second water inlet distributor via a first connecting pipe; Chamber C is located below chamber B and is separated by a second insulation board, on which a connecting hole is provided; chamber C is provided with a second sewage outlet, a second cooling water inlet and a second cooling water outlet, and a hot water cooler is arranged therein.

5. The heating furnace vaporization cooling system according to claim 4, characterized in that: A first control valve is provided on the steam outlet to control the pressure in chamber A.

6. The heating furnace vaporization cooling system according to claim 4, characterized in that: The first connecting pipe is provided with a second control valve for controlling the liquid level in chamber A.

7. The heating furnace vaporization cooling system according to claim 4, characterized in that: The first cooling water inlet is connected to the water outlet of the motor water supply pump, and the first cooling water outlet is connected to the water inlet of the deaerator; the second cooling water outlet is connected to the first cooling water inlet through a second connecting pipe.

8. The heating furnace vaporization cooling system according to claim 4, wherein: The steam cooler in the chamber B and the hot water cooler in the chamber C use a partition-type heat exchange with the cooling water.

9. The vaporization cooling system of the heating furnace according to claim 1, characterized in that: The motor circulating pump comprises a first motor circulating pump and a second motor circulating pump, wherein the first motor circulating pump and the second motor circulating pump are arranged in parallel via a connecting pipeline, one of which is in operation and the other is on standby.

10. The heating furnace vaporization cooling system according to claim 1, characterized in that: The motorized make-up water pump includes two make-up water pumps arranged in parallel through pipelines, and the motorized feed water pump includes two feed water pumps arranged in parallel through pipelines.

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