RH vacuum refining furnace production waste heat recovery system and method

Abstract

According to the RH vacuum refining furnace production waste heat recovery system and method, the waste heat recovery system recovers tail gas waste heat in the RH vacuum refining furnace production process through the air exhaust pipeline heat exchanger and the vacuum pump heat recovery mechanism, high-temperature hot water is prepared, the production tail gas waste heat is fully recovered, and the production efficiency is improved. And then the high-temperature hot water is introduced into the absorption refrigerating unit to prepare cold water, and the generated cold water is used as cooling water in the running process of the RH steam jet vacuum pump, so that the steam consumption and the water consumption of the steam jet pump are reduced. Recycled hot water is recycled in different water pools according to different temperatures and is used in a graded and classified mode, recycling is more reasonable, and efficiency is higher. Recycled hot water with the low temperature is introduced into a user heating system, the production waste heat of the RH refining furnace is fully utilized, and energy consumption and cost for heating of users are reduced; cold water generated by the absorption type refrigerating unit is collected in the cold water pool, the generated cold water is fully utilized to provide air conditioner refrigerating service, and the using energy consumption of an air conditioner is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat recovery from molten steel refining outside a furnace, and in particular relates to a system and method for recovering waste heat from production in an RH vacuum refining furnace. Background Art

[0002] RH vacuum refining technology is an indispensable part of the production and refining process of modern steel enterprises. During the production process, high-temperature flue gas will be generated. At the same time, the commonly used steam jet vacuum pump will generate a large amount of steam waste heat and residual steam.

[0003] Currently, high-temperature flue gas in the system is cooled by indirect heat exchange with equipment cooling water through water-cooling pipes. The flue gas then enters the vacuum system and, under the influence of high-speed steam, enters the condenser. Direct cooling water sprays the steam and exhaust gas, cooling them. Due to the increased temperature, the indirect cooling equipment cooling water and the directly cooled turbid circulating water are transported to the water treatment center through system pipelines, cooled in air-cooled cooling towers, and then recycled.

[0004] In the above process, it is not difficult to find that the waste heat of flue gas generated in the RH production process and the waste heat of steam from the steam vacuum pump are only taken away by water cooling heat exchange to ensure the normal operation of the system, but are not further utilized. The high-temperature water generated is cooled by the fan of the water treatment cooling tower, which increases the processing load of the cooling tower.

[0005] Among them, Zhou Tao et al. applied for a patent (application number: CN202322436113.3) on September 7, 2023. This patent discloses a RH smelting flue gas purification and waste heat comprehensive utilization system. This patent primarily utilizes a vaporization flue and a quenching waste heat boiler to generate saturated steam from the exhaust gas. This steam is then passed through a steam turbine to generate electricity, thereby achieving waste heat recovery. However, the operating temperature of the vaporization and cooling flue generally requires a temperature of 800-1000°C. Since the RH vacuum refining furnace is located in a vacuum system, the exhaust pipeline is generally long, leaving relatively little area for the vaporization and cooling flue to operate. Furthermore, the vaporization and cooling flue requires high cooling water quality, requiring additional equipment and costs to improve water quality. Adding a waste heat boiler to the vacuum system pipeline can easily increase pressure loss in the vacuum system, resulting in the existing system's vacuum level failing to meet process requirements or necessitating the construction of a new vacuum system with greater vacuum capacity, which is counterproductive.

[0006] Separately, Wang Yuzhi et al. applied for a patent on December 17, 2020 (application number: CN215908132U). This invention discloses a steam jet vacuum pump unit that utilizes process heat and exhaust waste heat. This patent primarily involves introducing hot water generated by the residual steam heat from the final-stage jet pump into a refrigeration unit for cooling. This chilled water is then used to cool the vacuum pump, thereby reducing steam consumption. This patent primarily involves recovering the waste heat from the final-stage pump steam at the final vacuum outlet.

[0007] During the production process of the RH refining furnace, due to the requirements of the production process and equipment operation, the way and state of latent heat generated in different parts are different. In order to further make full use of the waste heat of the RH refining furnace production process, it is urgent to study a device system that can more fully and reasonably utilize the waste heat of the RH refining furnace production process, so as to further achieve energy saving and consumption reduction of the RH vacuum refining device. Summary of the Invention

[0008] The object of the present invention is to provide a RH vacuum refining furnace production waste heat recovery system, which can more fully and reasonably utilize the waste heat of the RH refining furnace production process.

[0009] The purpose of the present invention is to provide a method for recovering waste heat from an RH vacuum refining furnace, which introduces hot water at a higher temperature into an absorption refrigeration unit to produce cold water, and the produced cold water is used as cooling water during the operation of an RH steam jet vacuum pump, thereby reducing the steam consumption and water consumption of the steam jet pump.

[0010] To this end, the technical solutions provided by the present invention are as follows: A waste heat recovery system for an RH vacuum refining furnace comprises a main exhaust pipe, an exhaust pipe heat exchanger, and a filter device, which are connected in sequence. The main exhaust pipe is connected to the air outlet of the RH vacuum refining furnace. The hot water outlet of the exhaust pipe heat exchanger is connected to a first hot water tank. The outlet of the filter device is connected to a vacuum pump heat recovery mechanism. The vacuum pump heat recovery mechanism includes a multi-stage heat recovery device connected in sequence. The inlets of the multi-stage heat recovery device are connected to a fresh water distributor, a cold water distributor, and a steam distributor via pipelines. The outlet of the multi-stage heat recovery device is connected to the first hot water tank and / or the second hot water tank via pipelines. The inlet of the cold water distributor is connected to the cold water tank through a pipeline, the inlet of the cold water tank is connected to the absorption chiller, the hot water inlet of the absorption chiller is connected to the first hot water tank, the hot water outlet of the absorption chiller is connected to the second hot water tank, the cold water inlet of the absorption chiller is connected to the new water tank, the second hot water tank and the new water tank are connected, and the connecting pipeline between the two is sequentially connected to a water pump 2, a filter and a cooling tower, the output pipeline of the new water tank is provided with a water pump 1, and the outlet of the water pump 1 is respectively connected to the first hot water tank, the absorption chiller and the new water distributor through pipelines; A heating system is connected between the filter and the cooling tower via pipeline 1. Valve 1 and valve 2 are provided on pipeline 1. Valve 1 and valve 2 are respectively provided at the two ends of the heating system. Valve 3 is provided on the connecting pipeline between the filter and the cooling tower. The outlet of the cold water pool is connected to the air-conditioning system via water pump 3 and pipeline 2. The cold water outlet of the air-conditioning system is connected to the second hot water pool and is installed with valve 4. Valve 5 is installed on pipeline 2. The vacuum pump heat recovery mechanism comprises a primary heat recovery device, a secondary heat recovery device, a tertiary heat recovery device and a final heat recovery device which are connected in sequence.

[0011] It also includes a PLC control system, and the valve one, valve two, valve three, valve four, valve five, water pump one, water pump two, water pump three and absorption refrigeration unit are all connected to the PLC control system with electrical signals.

[0012] The primary heat recovery device includes a B1 pump heat exchanger 1, a B1 vacuum pump, a B1 pump heat exchanger 2, a B2 vacuum pump, a B2 pump heat exchanger and a C1 condenser connected in sequence, the B1 vacuum pump is connected to the filter device, the B1 pump heat exchanger 1, the B1 pump heat exchanger 2 and the B2 pump heat exchanger are all connected to the new water distributor, the water outlet of the B1 pump heat exchanger 1 is connected to the cold water tank, the water outlets of the B1 pump heat exchanger 2 and the B2 pump heat exchanger are connected to the first hot water tank, and the outlet of the cold water tank is connected to the cold water distributor; The B1 vacuum pump and the B2 vacuum pump are both connected to the steam distributor, the inlet of the C1 condenser is connected to the cold water distributor, and the outlet of the C1 condenser is connected to the second hot water tank.

[0013] The secondary heat recovery device includes a B3 vacuum pump, a B3 pump heat exchanger and a C2 condenser connected in sequence, the inlet of the B3 pump heat exchanger is connected to the new water distributor, the inlet of the C2 condenser is connected to the cold water distributor, the outlet of the B3 pump heat exchanger is connected to the first hot water tank, the inlet of the B3 vacuum pump is connected to the steam distributor, and the outlet of the C2 condenser is connected to the second hot water tank.

[0014] The three-stage heat recovery device includes an S4a vacuum pump, an S4a pump heat exchanger, an S4b vacuum pump, an S4b pump heat exchanger and a C3 condenser, wherein the S4a vacuum pump and the S4a pump heat exchanger are sequentially connected, and the S4b vacuum pump and the S4b pump heat exchanger are sequentially connected, and the inlets of the S4a vacuum pump and the S4b vacuum pump are both connected to the C2 condenser of the secondary heat recovery device, and the outlets of the S4a pump heat exchanger and the S4b pump heat exchanger are both connected to the C3 condenser; The inlets of the S4a pump heat exchanger and the S4b pump heat exchanger are both connected to the new water distributor, the outlets of the S4a pump heat exchanger, the S4b pump heat exchanger and the C3 condenser are all connected to the first hot water tank, the inlet of the C3 condenser is connected to the cold water distributor, and the inlets of the S4a vacuum pump and the S4b vacuum pump are both connected to the steam distributor.

[0015] The final stage heat recovery device includes an S5a vacuum pump, an S5a pump heat exchanger, an S5b vacuum pump and an S5b pump heat exchanger, the S5a vacuum pump and the S5a pump heat exchanger are sequentially connected, the S5b vacuum pump and the S5b pump heat exchanger are sequentially connected, and the inlets of the S5a vacuum pump and the S5b vacuum pump are both connected to the C3 condenser and the steam distributor of the tertiary heat recovery device; The inlets of the S5a pump heat exchanger and the S5b pump heat exchanger are both connected to the new water distributor, the outlets of the S5a pump heat exchanger and the S5b pump heat exchanger are both connected to the first hot water tank, and the inlet of the C3 condenser is connected to the cold water distributor.

[0016] The filtering device comprises a cooling filter and a high-efficiency filter connected in sequence, a cooling water inlet of the cooling filter is communicated with a new water distributor, and a cooling water outlet of the cooling filter is communicated with a second hot water tank.

[0017] The first hot water tank is connected to the new water tank through a pipeline to adjust the temperature to between 55°C and 100°C, and the hot water is sent to the absorption refrigeration unit through water pump 4.

[0018] A method for recovering waste heat from an RH vacuum refining furnace. The high-temperature exhaust gas from the RH vacuum refining furnace is recycled through an exhaust pipe heat exchanger. The resulting high-temperature hot water enters a first hot water tank. The exhaust gas after heat exchange enters a cooling filter, where dust is filtered out and waste heat is further recovered. The resulting hot water enters the first hot water tank. The cooled exhaust gas enters a high-efficiency filter, where dust is further filtered out, reducing the amount of dust entering the vacuum pump system, thereby reducing water pollution in the cooling circulating water and thereby avoiding equipment damage caused by water pollution. The tail gas enters the vacuum pump heat recovery mechanism, and the vacuum pump heat recovery mechanism is connected to external steam through a steam distributor. The high-temperature hot water generated by the condensation of the steam is recovered by the vacuum pump heat recovery mechanism, and the steam waste heat and the high-temperature flue gas waste heat are recovered step by step. The generated hot water enters the first hot water tank and / or the second hot water tank; The new water tank is transported to the first hot water tank through water pump 1, and the hot water temperature is adjusted to between 55℃ and 100℃. The hot water is then transported to the absorption refrigeration unit through water pump 4. The hot water outlet of the absorption refrigeration unit is connected to the second hot water tank, realizing the circulation of the hot water system. The new water pool sends the new water with a temperature of 15℃~35℃ to the absorption refrigeration unit through the water pump 1, and the absorption refrigeration unit produces cold water with a temperature of 5℃~15℃ and collects it into the cold water pool; The cold water tank provides cold water to the air conditioning system to provide cooling services, or provides heating services through the latent heat of hot water in the second hot water tank.

[0019] The beneficial effects of the present invention are: The RH vacuum refining furnace production waste heat recovery system provided by the present invention recovers the waste heat of the tail gas during the RH vacuum refining furnace production process through an exhaust pipe heat exchanger and a vacuum pump heat recovery mechanism to produce high-temperature hot water, fully recovering the waste heat of the production tail gas. The high-temperature hot water is then introduced into an absorption refrigeration unit to produce cold water, and the generated cold water is used as cooling water during the operation of the RH steam jet vacuum pump, thereby reducing the steam consumption and water consumption of the steam jet pump.

[0020] This invention separates recovered hot water into different pools based on temperature, allowing for more efficient and graded recycling. The lower-temperature recovered hot water is introduced into the user's heating system, further fully utilizing waste heat from the RH refining furnace and reducing heating energy consumption and costs. Cold water generated by the absorption refrigeration unit is collected in a cold water pool and fully utilized for air conditioning and cooling services, reducing air conditioning energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a layout diagram of an embodiment of the present invention.

[0022] In the figure: 1. RH vacuum refining furnace; 2. Main exhaust pipe; 3. Exhaust pipe heat exchanger; 4. Cooling filter; 5. HEPA filter; 6. B1 vacuum pump; 7. B1 pump heat exchanger 1; 8. B1 pump heat exchanger 2; 9. B2 vacuum pump; 10. B2 pump heat exchanger; 11. C1 condenser; 12. B3 vacuum pump; 13. B3 pump heat exchanger; 14. C2 condenser; 15. S4a vacuum pump; 16. S4a pump heat exchanger; 17. S4b vacuum pump; 18. S4b pump heat exchanger; 19. C3 condenser; 20. S5a vacuum pump; 21. S5a pump heat exchanger; 22. S 5b vacuum pump; 23. S5b pump heat exchanger; 24. First hot water tank; 25. Second hot water tank; 26. Cold water tank; 27. Absorption chiller; 28. Filter; 29. ​​Cooling tower; 30. New water tank; 31. Steam distributor; 32. Cold water distributor; 33. New water distributor; 34. Water pump one; 35. Water pump two; 36. Water pump three; 37. Water pump four; 38. PLC control system; 39. Heating system; 40. Air conditioning system; 41. Pipeline one; 42. Valve one; 43. Valve two; 44. Valve three; 45. Valve four; 46. Valve five; 47. Pipeline two. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0024] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so as to provide a thorough and complete disclosure of the present invention and fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0025] Unless otherwise specified, the terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have meanings consistent with the context of their relevant fields and should not be interpreted as idealized or overly formal.

[0026] Example 1 The present invention provides an RH vacuum refining furnace production waste heat recovery system, comprising a main exhaust pipe 2, an exhaust pipe heat exchanger 3, and a filter device connected in sequence. The main exhaust pipe 2 is connected to the air outlet of the RH vacuum refining furnace 1. The hot water outlet of the exhaust pipe heat exchanger 3 is connected to a first hot water tank 24. The outlet of the filter device is connected to a vacuum pump heat recovery mechanism. The vacuum pump heat recovery mechanism includes a multi-stage heat recovery device connected in sequence. The inlets of the multi-stage heat recovery device are all connected to a new water distributor 33, a cold water distributor 32, and a steam distributor 31 through pipelines. The outlet of the multi-stage heat recovery device is connected to the first hot water tank 24 and / or the second hot water tank 25 through pipelines. The inlet of the cold water distributor 32 is connected to the cold water tank 26 through a pipeline. The inlet of the cold water tank 26 is connected to the absorption chiller 27. The hot water inlet of the absorption chiller 27 is connected to the first hot water tank 24. The hot water outlet of the absorption chiller 27 is connected to the second hot water tank 25. The cold water inlet of the absorption chiller 27 is connected to the new water tank 30. The second hot water tank 25 and the new water tank 30 are connected, and the connecting pipeline between the two is sequentially connected to a water pump 2 35, a filter 28 and a cooling tower 29. The output pipeline of the new water tank 30 is provided with a water pump 1 34. The outlet of the water pump 1 34 is connected to the first hot water tank 24, the absorption chiller 27 and the new water distributor 33 through pipelines respectively. The filter 28 and the cooling tower 29 are connected to a heating system via pipeline 1. Valve 1 42 and valve 2 42 are provided on pipeline 1 41. Valve 1 41 and valve 2 42 are respectively provided at both ends of the heating system 39. Valve 3 43 is provided on the connecting pipeline between the filter 28 and the cooling tower 29. The outlet of the cold water tank 26 is connected to the air-conditioning system 40 via water pump 3 36 and pipeline 2 47. The cold water outlet of the air-conditioning system 40 is connected to the second hot water tank 25 and is installed with valve 4 44. Valve 5 45 is installed on pipeline 2 47. In the present invention, the RH vacuum refining furnace 1 is a container for molten steel reaction and is also the main source of system heat and high-temperature exhaust gas; the inlet of the steam distributor 31 is connected to an external steam source, so external steam is another main source of heat generated by the RH refining furnace.

[0027] like Figure 1 As shown, the exhaust pipe heat exchanger 3 is installed in conjunction with the main exhaust pipe 2, with its water inlet connected to the new water distributor 33 and its outlet connected to the first hot water tank 24, which is used to recover the waste heat of the high-temperature flue gas in the first step and produce high-temperature hot water at the same time.

[0028] The RH vacuum refining furnace 1 production waste heat recovery device system provided by the present invention recovers the waste heat of the tail gas during the production process of the RH vacuum refining furnace 1 through the exhaust pipe heat exchanger 3 and the vacuum pump heat recovery mechanism, produces high-temperature hot water, and fully recovers the waste heat of the production tail gas. The high-temperature hot water is then introduced into the absorption refrigeration unit 27 to produce cold water, and the generated cold water is used as cooling water during the operation of the RH steam jet vacuum pump, thereby reducing the steam consumption and water consumption of the steam jet pump.

[0029] The present invention separates recovered hot water into different pools based on temperature, allowing for graded and classified use, resulting in more efficient and rational recycling. The recovered, lower-temperature hot water is introduced into the user's heating system, further fully utilizing waste heat from the RH refining furnace and reducing heating energy consumption and costs. The cold water produced by the absorption refrigeration unit 27 is collected in a cold water pool 26, fully utilizing the generated cold water to provide air conditioning and cooling services, reducing air conditioning energy consumption.

[0030] Example 2 Based on Example 1, this example provides a RH vacuum refining furnace production waste heat recovery system, such as Figure 1 As shown, the vacuum pump heat recovery mechanism includes a first-stage heat recovery device, a second-stage heat recovery device, a third-stage heat recovery device and a final-stage heat recovery device connected in sequence.

[0031] Wherein, the primary heat recovery device includes a B1 pump heat exchanger 17, a B1 vacuum pump 6, a B1 pump heat exchanger 28, a B2 vacuum pump 9, a B2 pump heat exchanger 10 and a C1 condenser 11 which are connected in sequence, the B1 pump heat exchanger 17 is connected to the filtering device, the B1 vacuum pump 6, the B1 pump heat exchanger 28 and the B2 pump heat exchanger 10 are all connected to the new water distributor 33, the water outlet of the B1 pump heat exchanger 17 is connected to the cold water pool 26, the water outlets of the B1 pump heat exchanger 28 and the B2 pump heat exchanger 10 are connected to the first hot water pool 24, and the outlet of the cold water pool 26 is connected to the cold water distributor 32; The B1 vacuum pump 6 and the B2 vacuum pump 9 are both connected to the steam distributor 31 , the inlet of the C1 condenser 11 is connected to the cold water distributor 32 , and the outlet of the C1 condenser 11 is connected to the second hot water tank 25 .

[0032] like Figure 1 As shown, B1 pump heat exchanger 1 7 is installed in conjunction with the inlet of B1 vacuum pump 6. Its inlet is connected to the fresh water distributor 33, and its outlet is connected to the cold water tank 26. B1 vacuum pump 6 is used to recover low-temperature heat from the inlet area. B1 pump heat exchanger 2 8 is installed in conjunction with the outlet of B1 vacuum pump 6. Its inlet is connected to the fresh water distributor 33, and its outlet is connected to the first hot water tank 24. It is used to recover the waste heat of steam and high-temperature flue gas at the end of B1 vacuum pump 6.

[0033] The B2 pump heat exchanger 10 is installed in conjunction with the outlet of the B2 vacuum pump 9, with its inlet connected to the new water distributor 33 and its outlet connected to the first hot water tank 24, for recovering the waste heat of steam and high-temperature flue gas at the end of the B2 vacuum pump 9.

[0034] The inlet and outlet of the C1 condenser 11 are respectively installed in conjunction with the outlet of the B2 vacuum pump 9 and the inlet of the B3 vacuum pump 12. Its cooling water inlet is connected to the cold water distributor 32, and its outlet is connected to the second hot water pool 25, which is used to further cool the steam waste heat and high-temperature flue gas in the production process.

[0035] Example 3 Based on Example 1, this embodiment provides a RH vacuum refining furnace production waste heat recovery system, which also includes a PLC control system. The valve one 42, valve two 43, valve three 44, valve four 45, and valve five 46 are all electrically connected to the PLC control system.

[0036] The setting of the PLC control system can automatically control valve one 42, valve two 43, valve three 44, valve four 45, valve five 46, water pump one 34, water pump two 35, water pump three 36 and absorption refrigeration unit 27, thereby completing the automatic control and operation of the system.

[0037] Example 4 Based on Example 2, this embodiment provides a RH vacuum refining furnace production waste heat recovery system, wherein the secondary heat recovery device includes a B3 vacuum pump 12, a B3 pump heat exchanger 13 and a C2 condenser 14 connected in sequence, the inlet of the B3 pump heat exchanger 13 is connected to the new water distributor 33, the inlet of the C2 condenser 14 is connected to the cold water distributor 32, the outlet of the B3 pump heat exchanger 13 is connected to the first hot water pool 24, the inlet of the B3 vacuum pump 12 is connected to the steam distributor 31, and the outlet of the C2 condenser 14 is connected to the second hot water pool 25.

[0038] like Figure 1 As shown, the B3 pump heat exchanger 13 is installed in conjunction with the B3 vacuum pump 12. The cooling water inlet of the B3 pump heat exchanger 13 is connected to the new water distributor 33, and the outlet is connected to the first hot water tank 24, which is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the B3 vacuum pump 12.

[0039] The inlet and outlet of the C2 condenser 14 are respectively installed in conjunction with the outlet of the B3 vacuum pump 12 and the inlet of the tertiary heat recovery device. The cooling water inlet of the C2 condenser 14 is connected to the cold water distributor 32, and the outlet is connected to the second hot water tank 25, which is used to further cool the steam waste heat and high-temperature flue gas in the production process.

[0040] Example 5 Based on Example 4, this embodiment provides an RH vacuum refining furnace production waste heat recovery system, wherein the three-stage heat recovery device includes an S4a vacuum pump 15, an S4a pump heat exchanger 16, an S4b vacuum pump 17, an S4b pump heat exchanger 18, and a C3 condenser 19. The S4a vacuum pump 15 and the S4a pump heat exchanger 16 are sequentially connected, and the S4b vacuum pump 17 and the S4b pump heat exchanger 18 are sequentially connected. The inlets of the S4a vacuum pump 15 and the S4b vacuum pump 17 are both connected to the C2 condenser 14 of the secondary heat recovery device, and the outlets of the S4a pump heat exchanger 16 and the S4b pump heat exchanger 18 are both connected to the C3 condenser 19; The inlets of the S4a pump heat exchanger 16 and the S4b pump heat exchanger 18 are both connected to the new water distributor 33, the outlets of the S4a pump heat exchanger 16, the S4b pump heat exchanger 18 and the C3 condenser 19 are all connected to the first hot water tank 24, the inlet of the C3 condenser 19 is connected to the cold water distributor 32, and the inlets of the S4a vacuum pump 15 and the S4b vacuum pump 17 are both connected to the steam distributor 31.

[0041] like Figure 1As shown, the inlets of the S4a vacuum pump 15 and the S4b vacuum pump 17 are both installed in conjunction with the outlet of the C2 condenser 14, and the S4a pump heat exchanger 16 is installed in conjunction with the S4a vacuum pump 15. The cooling water inlet of the S4a pump heat exchanger 16 is connected to the new water distributor 33, and the outlet is connected to the first hot water tank 24, which is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the S4a vacuum pump 15.

[0042] The S4b pump heat exchanger 18 is installed in conjunction with the S4b vacuum pump 17. The cooling water inlet of the S4b pump heat exchanger 18 is connected to the new water distributor 33, and the outlet is connected to the first hot water pool 24, which is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the S4b vacuum pump 17.

[0043] Example 6 Based on Example 2, this embodiment provides an RH vacuum refining furnace production waste heat recovery system, wherein the final stage heat recovery device includes an S5a vacuum pump 20, an S5a pump heat exchanger 21, an S5b vacuum pump 22, and an S5b pump heat exchanger 23. The S5a vacuum pump 20 and the S5a pump heat exchanger 21 are sequentially connected, and the S5b vacuum pump 22 and the S5b pump heat exchanger 23 are sequentially connected. The inlets of the S5a vacuum pump 20 and the S5b vacuum pump 22 are both connected to the C3 condenser 19 and the steam distributor 31 of the tertiary heat recovery device; The inlets of the S5a pump heat exchanger 21 and the S5b pump heat exchanger 23 are both connected to the new water distributor 33 , the outlets of the S5a pump heat exchanger 21 and the S5b pump heat exchanger 23 are both connected to the first hot water tank 24 , and the inlet of the C3 condenser 19 is connected to the cold water distributor 32 .

[0044] like Figure 1 As shown, the outlets of S4a vacuum pump 15 and S4b vacuum pump 17 are both connected to the inlet of C3 condenser 19, which is in turn connected to the inlets of S5a vacuum pump 20 and S5b vacuum pump 22. The cooling water inlet of C3 condenser 19 is connected to cold water distributor 32, and the outlet is connected to first hot water tank 24, which is used to further cool and recycle the waste heat from the production process steam and high-temperature flue gas.

[0045] The S5a pump heat exchanger 21 is installed in conjunction with the S5a vacuum pump 20. The cooling water inlet of the S5a pump heat exchanger 21 is connected to the new water distributor 33, and the outlet is connected to the first hot water tank 24, which is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the S5a vacuum pump 20.

[0046] The inlet of the S5a vacuum pump 20 is installed in conjunction with the C3 condenser 19, and the outlet of the S5a vacuum pump 20 is connected to the first hot water pool 24, which is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the S5a vacuum pump 20.

[0047] The inlet of the S5b vacuum pump 22 is installed in conjunction with the C3 condenser 19 , and the outlet of the S5b vacuum pump 22 is connected to the first hot water tank 24 for recovering the waste heat of steam and high-temperature flue gas at the end of the S5b vacuum pump 22 .

[0048] The S5b pump heat exchanger 23 is installed in conjunction with the S5b vacuum pump 22. Its cooling water inlet is connected to the new water distributor 33, and its outlet is connected to the first hot water tank 24. It is used to recover the steam waste heat and high-temperature flue gas waste heat at the end of the S5b vacuum pump 22.

[0049] Example 6 Based on Example 1, this embodiment provides a RH vacuum refining furnace production waste heat recovery system, wherein the filtering device includes a cooling filter 4 and a high-efficiency filter 5 connected in sequence, the cooling water inlet of the cooling filter 4 is connected to the new water distributor 33, and the cooling water outlet of the cooling filter 4 is connected to the first hot water pool 24.

[0050] like Figure 1 As shown, the cooling filter 4 is installed in series with the main exhaust pipe 2 and is equipped with a cooling heat exchange device. The water inlet of the cooling heat exchange device is connected to the new water distributor 33, and the water outlet is connected to the first hot water tank 24, which is used to further recover the waste heat of the high-temperature flue gas and produce high-temperature hot water at the same time. While cooling the high-temperature flue gas, large particles of dust are filtered and removed.

[0051] The high efficiency filter 5 is located at the rear end of the cooling filter 4 and is installed in series with the main exhaust pipe 2 to further filter the dust in the exhaust gas to ensure the cleanliness of the hot water subsequently discharged into the first hot water tank 24.

[0052] Example 7 Based on Example 1, this embodiment provides a RH vacuum refining furnace production waste heat recovery system, in which the first hot water pool 24 is connected to the new water pool 30 through a pipeline to adjust the temperature to between 55°C and 100°C, and the hot water is sent to the absorption refrigeration unit 27 through a water pump 4 37.

[0053] The first hot water tank 24 is used to collect the hot water recovered by the RH system. The first hot water tank 24 is connected to the new water tank 30 through a pipeline to adjust the hot water temperature to between 55°C and 100°C, and the hot water is sent to the absorption refrigeration unit 27 through the water pump 4 37.

[0054] The hot water inlet of the absorption refrigeration unit 27 is connected to the first hot water tank 24, and the hot water outlet is connected to the second hot water tank 25, achieving a circulating hot water system. The fresh water tank 30 is connected to the cold water inlet of the absorption refrigeration unit 27, providing it with fresh water at a temperature of 15°C to 35°C. The absorption refrigeration unit 27 then produces cold water at a temperature of 5°C to 15°C, which is then collected in the cold water tank 26.

[0055] Cold water collected in cold water reservoir 26 is delivered to cold water distributor 32 via water pump 36, and then to C1 condenser 11, C2 condenser 14, and C3 condenser 19, where it is used to cool waste heat from steam and high-temperature flue gas. The air conditioning system's cold water inlet is connected to cold water reservoir 26, and its cold water outlet is connected to the second hot water reservoir 25, fully utilizing the cold water generated by absorption refrigeration unit 27 to provide air conditioning and cooling services to users.

[0056] The second hot water tank 25 is used to collect hot water from the C1 condenser 11, the C2 condenser 14 and the absorption refrigeration unit 27 after operation, and sends it to the filter 28 for filtration through the water pump 35 and the pipeline, and is cooled to 15°C~35°C in the cooling tower 29 and collected in the new water tank 30.

[0057] The heating system is installed between the filter 28 and the cooling tower 29, and a valve is provided on the connecting pipe to recover the latent heat of the hot water in the second hot water tank 25 to provide heating services for users.

[0058] Example 8 This embodiment provides a method for recovering waste heat from an RH vacuum refining furnace. The high-temperature exhaust gas from the RH vacuum refining furnace 1 is recycled through an exhaust pipe heat exchanger 3. The resulting high-temperature hot water enters a first hot water tank 24. The exhaust gas after heat exchange enters a cooling filter 4, where dust is filtered out and waste heat is further recovered. The resulting hot water enters the first hot water tank 24. The cooled exhaust gas enters a high-efficiency filter 5, where dust is further filtered out, reducing the amount of dust entering the vacuum pump system. This reduces water pollution in the cooling circulating water and thus prevents equipment damage caused by water pollution. The tail gas enters the vacuum pump heat recovery mechanism, and the vacuum pump heat recovery mechanism is connected to external steam through the steam distributor 31. The high-temperature hot water generated by the condensation of the steam is recovered by the vacuum pump heat recovery mechanism, and the waste heat of the steam and the high-temperature flue gas are recovered step by step. The generated hot water enters the first hot water tank 24 and / or the second hot water tank 25; The new water tank 30 delivers new water to the first hot water tank 24 via a water pump 1 34, adjusting the hot water temperature to between 55°C and 100°C. The hot water is then delivered to the absorption refrigeration unit 27 via a water pump 4 37. The hot water outlet of the absorption refrigeration unit 27 is connected to the second hot water tank 25, thus achieving a circulating flow in the hot water system. The new water tank 30 delivers the new water at 15°C to 35°C to the absorption refrigeration unit 27 via a water pump 34. The absorption refrigeration unit 27 produces cold water at 5°C to 15°C and collects it into the cold water tank 26. The cold water tank 26 provides cold water to the air conditioning system for cooling services, or the second hot water tank 25 provides heating services with the latent heat of hot water.

[0059] The present invention classifies waste heat generated during the RH vacuum refining furnace production process according to its location and state, and employs different recovery and treatment methods. This allows for more efficient waste heat recovery from the RH refining furnace, thereby reducing the operating load of the RH refining furnace's associated water treatment system. Higher-temperature hot water is introduced into the absorption refrigeration unit 27 to produce cold water, which is then used as cooling water for the RH steam jet vacuum pump during operation, thereby reducing the steam and water consumption of the steam jet pump.

[0060] The above examples are merely illustrative of the present invention and do not limit the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A waste heat recovery system for RH vacuum refining furnace production, characterized by: It comprises a main exhaust pipe, an exhaust pipe heat exchanger and a filtering device connected in sequence, the main exhaust pipe is connected to the air outlet of the RH vacuum refining furnace, the hot water outlet of the exhaust pipe heat exchanger is connected to the first hot water tank, the outlet of the filtering device is connected to a vacuum pump heat recovery mechanism, the vacuum pump heat recovery mechanism comprises a multi-stage heat recovery device connected in sequence, the inlets of the multi-stage heat recovery device are connected to a new water distributor, a cold water distributor and a steam distributor through pipelines, and the outlet of the multi-stage heat recovery device is connected to the first hot water tank and / or the second hot water tank through a pipeline; The inlet of the cold water distributor is connected to the cold water tank through a pipeline, the inlet of the cold water tank is connected to the absorption chiller, the hot water inlet of the absorption chiller is connected to the first hot water tank, the hot water outlet of the absorption chiller is connected to the second hot water tank, the cold water inlet of the absorption chiller is connected to the new water tank, the second hot water tank and the new water tank are connected, and the connecting pipeline between the two is sequentially connected to a water pump 2, a filter and a cooling tower, the output pipeline of the new water tank is provided with a water pump 1, and the outlet of the water pump 1 is respectively connected to the first hot water tank, the absorption chiller and the new water distributor through pipelines; A heating system is connected between the filter and the cooling tower via pipeline 1. Valve 1 and valve 2 are provided on pipeline 1. Valve 1 and valve 2 are respectively provided at the two ends of the heating system. Valve 3 is provided on the connecting pipeline between the filter and the cooling tower. The outlet of the cold water pool is connected to the air-conditioning system via water pump 3 and pipeline 2. The cold water outlet of the air-conditioning system is connected to the second hot water pool and is installed with valve 4. Valve 5 is installed on pipeline 2.

2. The RH vacuum refining furnace waste heat recovery system according to claim 1, characterized in that: The vacuum pump heat recovery mechanism comprises a primary heat recovery device, a secondary heat recovery device, a tertiary heat recovery device and a final heat recovery device which are connected in sequence.

3. The RH vacuum refining furnace waste heat recovery system according to claim 1, characterized in that: It also includes a PLC control system, and the valve one, valve two, valve three, valve four, valve five, water pump one, water pump two, water pump three and absorption refrigeration unit are all connected to the PLC control system with electrical signals.

4. The RH vacuum refining furnace waste heat recovery system according to claim 2, characterized in that: The primary heat recovery device includes a B1 pump heat exchanger 1, a B1 vacuum pump, a B1 pump heat exchanger 2, a B2 vacuum pump, a B2 pump heat exchanger and a C1 condenser connected in sequence, the B1 vacuum pump is connected to the filter device, the B1 pump heat exchanger 1, the B1 pump heat exchanger 2 and the B2 pump heat exchanger are all connected to the new water distributor, the water outlet of the B1 pump heat exchanger 1 is connected to the cold water tank, the water outlets of the B1 pump heat exchanger 2 and the B2 pump heat exchanger are connected to the first hot water tank, and the outlet of the cold water tank is connected to the cold water distributor; The B1 vacuum pump and the B2 vacuum pump are both connected to the steam distributor, the inlet of the C1 condenser is connected to the cold water distributor, and the outlet of the C1 condenser is connected to the second hot water tank.

5. The RH vacuum refining furnace waste heat recovery system according to claim 2, characterized in that: The secondary heat recovery device includes a B3 vacuum pump, a B3 pump heat exchanger and a C2 condenser connected in sequence, the inlet of the B3 pump heat exchanger is connected to the new water distributor, the inlet of the C2 condenser is connected to the cold water distributor, the outlet of the B3 pump heat exchanger is connected to the first hot water tank, the inlet of the B3 vacuum pump is connected to the steam distributor, and the outlet of the C2 condenser is connected to the second hot water tank.

6. The RH vacuum refining furnace waste heat recovery system according to claim 2, characterized in that: The three-stage heat recovery device includes an S4a vacuum pump, an S4a pump heat exchanger, an S4b vacuum pump, an S4b pump heat exchanger and a C3 condenser, wherein the S4a vacuum pump and the S4a pump heat exchanger are sequentially connected, and the S4b vacuum pump and the S4b pump heat exchanger are sequentially connected, and the inlets of the S4a vacuum pump and the S4b vacuum pump are both connected to the C2 condenser of the secondary heat recovery device, and the outlets of the S4a pump heat exchanger and the S4b pump heat exchanger are both connected to the C3 condenser; The inlets of the S4a pump heat exchanger and the S4b pump heat exchanger are both connected to the new water distributor, the outlets of the S4a pump heat exchanger, the S4b pump heat exchanger and the C3 condenser are all connected to the first hot water tank, the inlet of the C3 condenser is connected to the cold water distributor, and the inlets of the S4a vacuum pump and the S4b vacuum pump are both connected to the steam distributor.

7. The RH vacuum refining furnace waste heat recovery system according to claim 2, characterized in that: The final stage heat recovery device includes an S5a vacuum pump, an S5a pump heat exchanger, an S5b vacuum pump and an S5b pump heat exchanger, the S5a vacuum pump and the S5a pump heat exchanger are sequentially connected, the S5b vacuum pump and the S5b pump heat exchanger are sequentially connected, and the inlets of the S5a vacuum pump and the S5b vacuum pump are both connected to the C3 condenser and the steam distributor of the tertiary heat recovery device; The inlets of the S5a pump heat exchanger and the S5b pump heat exchanger are both connected to the new water distributor, the outlets of the S5a pump heat exchanger and the S5b pump heat exchanger are both connected to the first hot water tank, and the inlet of the C3 condenser is connected to the cold water distributor.

8. The RH vacuum refining furnace waste heat recovery system according to any one of claims 1 to 7, characterized in that: The filtering device includes a cooling filter and a high-efficiency filter connected in sequence, a cooling water inlet of the cooling filter is communicated with a new water distributor, and a cooling water outlet of the cooling filter is communicated with a first hot water tank.

9. The RH vacuum refining furnace waste heat recovery system according to any one of claims 1 to 7, characterized in that: The first hot water tank is connected to the new water tank through a pipeline to adjust the temperature to between 55°C and 100°C, and the hot water is sent to the absorption refrigeration unit through water pump 4.

10. A method for recovering waste heat from an RH vacuum refining furnace, using the RH vacuum refining furnace waste heat recovery system according to claim 8, characterized in that: The high-temperature tail gas from the RH vacuum refining furnace is recycled through the exhaust pipe heat exchanger, and the generated high-temperature hot water enters the first hot water tank. The tail gas after heat exchange enters the cooling filter, where the dust is filtered out and the waste heat of the tail gas is further recovered. The generated hot water enters the first hot water tank; the cooled tail gas enters the high-efficiency filter, which further filters out the dust in the tail gas, reducing the amount of dust entering the vacuum pump system, thereby reducing water pollution of the cooling circulating water and avoiding equipment damage caused by water pollution. The tail gas enters the vacuum pump heat recovery mechanism, and the vacuum pump heat recovery mechanism is connected to external steam through a steam distributor. The high-temperature hot water generated by the condensation of the steam is recovered by the vacuum pump heat recovery mechanism, and the steam waste heat and the high-temperature flue gas waste heat are recovered step by step. The generated hot water enters the first hot water tank and / or the second hot water tank; The new water tank is transported to the first hot water tank through water pump 1, and the hot water temperature is adjusted to between 55℃ and 100℃. The hot water is then transported to the absorption refrigeration unit through water pump 4. The hot water outlet of the absorption refrigeration unit is connected to the second hot water tank, realizing the circulation of the hot water system. The new water pool sends the new water with a temperature of 15℃~35℃ to the absorption refrigeration unit through the water pump 1, and the absorption refrigeration unit produces cold water with a temperature of 5℃~15℃ and collects it into the cold water pool; The cold water tank provides cold water to the air conditioning system to provide cooling services, or provides heating services through the latent heat of hot water in the second hot water tank.

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