A pharmaceutical industry boiler waste heat and waste water recovery system and method

Abstract

This invention discloses a system and method for recovering waste heat and waste water from boilers in the pharmaceutical industry, belonging to the field of pharmaceutical energy recovery technology. The system includes a primary high-temperature recovery tank, a secondary low-temperature recovery tank, a boiler condenser, and a boiler feedwater tank; it also includes a high-temperature resin tank for receiving secondary concentrate from a multi-effect distillation machine, substandard water, and hot water from a water bath sterilizer. An iron removal device is connected in series at the inlet of the high-temperature resin tank. The method includes: passing boiler wastewater at a temperature not lower than 130°C through two stages of heat exchange in the primary high-temperature recovery tank and the secondary low-temperature recovery tank, heating softened water to 75°C and 40°C respectively, then passing it through the boiler condenser flue gas for heat exchange to 70°C before sending it to the boiler feedwater tank; simultaneously, the pharmaceutical wastewater undergoes iron removal and softening treatment through the iron removal device and the high-temperature resin tank before reuse. This invention achieves cascaded recovery of heat energy from boiler wastewater and safe reuse of pharmaceutical wastewater, reducing boiler operating energy consumption.

Description

Technical Field

[0001] This application relates to the field of energy recovery technology in the pharmaceutical industry, and more specifically, to a system and method for recovering waste heat and waste water from boilers in the pharmaceutical industry. Background Technology

[0002] In pharmaceutical production, steam boilers are key equipment for providing heat sources, and the continuous wastewater they generate during operation typically reaches temperatures exceeding 130°C. Currently, this high-temperature wastewater is generally treated by direct discharge, meaning it is discharged directly after being naturally cooled in a cooling tank. This not only wastes a significant amount of heat energy but also increases the burden on wastewater treatment.

[0003] Meanwhile, the multi-effect distillation water machines used in pharmaceutical workshops generate secondary concentrated water and substandard water during the production of water for injection. Water bath sterilizers also discharge large amounts of high-temperature cleaning water after sterilization. Currently, these water sources are directly discharged, wasting valuable water resources and losing their heat energy. Furthermore, boiler feedwater has strict quality requirements: hardness must be less than 0.03 mmol / L and iron ion concentration must be less than 0.3 mg / L. The aforementioned wastewater often contains excessive iron ions and hardness, and the factory's pipelines are mostly made of carbon steel, resulting in high iron ion content in the water. This makes it impossible to directly reuse this wastewater as boiler feedwater, further exacerbating resource waste. Although some single heat recovery or water treatment devices exist in existing technologies, there is a lack of systematic solutions tailored to the specific operating conditions of the pharmaceutical industry. This prevents the efficient, tiered recovery of wastewater heat energy and the safe reuse of wastewater, leading to persistently high boiler operating energy consumption and hindering effective reduction of production costs for enterprises. Summary of the Invention

[0004] The main purpose of this application is to provide a waste heat and waste water recovery system and method for the pharmaceutical industry boilers to solve existing problems.

[0005] To achieve the above objectives, this application provides the following technology: a waste heat and waste water recovery system for a pharmaceutical industry boiler, comprising a primary high-temperature recovery tank connected to a steam boiler, a secondary low-temperature recovery tank connected to the primary high-temperature recovery tank, a boiler condenser connected to the secondary low-temperature recovery tank, and a boiler feedwater tank connected to the primary high-temperature recovery tank and the boiler condenser respectively; the inlet of the primary high-temperature recovery tank is connected to the boiler's continuous blowdown pipe for receiving continuous boiler wastewater; a tubular heat exchanger is installed inside the primary high-temperature recovery tank, the tubular heat exchanger having a softened water inlet and a softened water outlet; a steam outlet is provided at the top of the primary high-temperature recovery tank, and a cooled wastewater outlet is provided at the bottom; the inlet of the secondary low-temperature recovery tank is connected to the cooled wastewater outlet at the bottom of the primary high-temperature recovery tank for receiving... After the primary heat exchange, the wastewater is discharged into a secondary low-temperature recovery tank equipped with a coil. The coil has a room-temperature softened water inlet and a softened water outlet. The bottom of the secondary low-temperature recovery tank has a room-temperature discharge port. The primary high-temperature recovery tank and the secondary low-temperature recovery tank are also connected to a room-temperature softened water pool. The boiler feedwater tank has a first inlet, a second inlet, a third inlet, and a fourth inlet. The first inlet is connected to the softened water outlet of the tubular heat exchanger, the second inlet is connected to the steam outlet at the top of the primary high-temperature recovery tank, and the third inlet is connected to the softened water outlet of the boiler condenser. It also includes a high-temperature resin tank for receiving secondary concentrate from a multi-effect distillation water machine, substandard water, and hot water from a water bath sterilizer. The high-temperature resin tank is connected to the boiler feedwater tank, and an iron removal device is connected in series at the inlet of the high-temperature resin tank.

[0006] Optionally, the iron removal device includes a housing, a stainless steel sintered felt filter element disposed within the housing, and a polymeric permanent magnet rod disposed downstream of the filter element. The polymeric permanent magnet rod is covered with a stainless steel sleeve. The iron removal device has a residual water collection inlet and an iron removal water outlet.

[0007] Optionally, the inlet of the high-temperature resin tank is connected to the iron removal water outlet of the iron removal device, and the outlet of the high-temperature resin tank is connected to the fourth water inlet of the boiler feedwater tank; the residual water collection inlet of the iron removal device is connected to the secondary concentrated water outlet and the unqualified water outlet of the multi-effect distillation water machine, as well as the high-temperature discharge port of the water bath sterilizer.

[0008] Optionally, the primary high-temperature recovery tank is a pressure vessel, and the secondary low-temperature recovery tank is an atmospheric pressure tank, with the coil submerged in the wastewater of the secondary low-temperature recovery tank.

[0009] Optionally, the inlet of the boiler condenser is connected to the softened water outlet of the coil to exchange heat between the 40°C softened water and the high-temperature flue gas from the boiler to 70°C.

[0010] A method for recovering waste heat and waste water from boilers in the pharmaceutical industry, using the aforementioned waste heat and waste water recovery system for pharmaceutical boilers, includes the following steps: Boiler wastewater with a temperature not lower than 130℃ is continuously fed into the primary high-temperature recovery tank. The softened water undergoes primary heat exchange with the tubular heat exchanger inside the tank. The softened water is heated to 75℃ and then transported to the boiler feedwater tank through the first inlet. At the same time, the steam generated in the primary high-temperature recovery tank is introduced into the boiler feedwater tank through the second inlet. The wastewater after primary heat exchange is fed into the secondary low-temperature recovery tank, where it undergoes secondary heat exchange with room-temperature softened water through the coils inside the tank. The softened water is heated to about 40°C and then fed into the boiler condenser, where it exchanges heat with the high-temperature flue gas of the boiler to raise the temperature to 70°C. The wastewater is then transported to the boiler feedwater tank through the third inlet. At the same time, the wastewater is cooled to room temperature and discharged through the outlet. The secondary concentrated water and substandard water produced by the multi-effect distillation water machine, as well as the high-temperature water produced by the water bath sterilizer, are collected and passed into the iron removal device. The iron impurities are removed by the stainless steel sintered felt filter element and polymeric permanent magnet rod, so that the iron ion concentration in the effluent is less than 0.3 mg / L. After iron removal, the water is passed into a high-temperature resin tank for softening treatment. The hardness of the effluent is reduced to less than 0.03 mmol / L. The softened water is then transported to the boiler feedwater tank through the fourth inlet and mixed with the softened water obtained from the heat recovery step as boiler feedwater.

[0011] Optionally, the wastewater temperature is reduced to 30°C after heat exchange in the secondary cryogenic recovery tank before being discharged.

[0012] Optionally, the room temperature softened water entering the secondary cryogenic recovery tank is below 30°C.

[0013] Optionally, the polymeric permanent magnet rods adsorb ferrous impurities in the water using magnetic force, and the iron ions are adsorbed onto the surface of the stainless steel sleeve.

[0014] Compared with existing technologies, this application brings the following technical effects: By constructing an integrated system for gradient heat recovery of boiler wastewater and purification and reuse of pharmaceutical wastewater, this invention achieves dual savings in energy and water resources. In terms of heat recovery, a heat recovery network with decreasing temperature is formed through the series configuration of a primary high-temperature recovery tank, a secondary low-temperature recovery tank, and a boiler condenser. This allows for the step-by-step extraction of high-temperature heat energy above 130°C from the continuous boiler wastewater. This heat energy is then used to heat softened water sequentially from room temperature to 75°C, 40°C, and then to 70°C via flue gas heat exchange, ultimately reducing the wastewater temperature to around 30°C before discharge. This significantly improves heat utilization efficiency and reduces boiler fuel consumption.

[0015] Regarding waste water reuse, an iron removal device and a high-temperature resin tank are connected in series. The synergistic effect of stainless steel sintered felt filter elements and polymeric permanent magnets effectively removes ferrous impurities, reducing the iron ion concentration to below 0.3 mg / L. Further high-temperature resin softening treatment reduces the hardness to below 0.03 mmol / L, ensuring that secondary concentrate from the multi-effect distillation water machine, substandard water, and hot water from the water bath sterilizer can be safely reused as boiler feedwater, reducing fresh water consumption and wastewater discharge. This system organically combines heat recovery and water purification, raising the boiler feedwater temperature to 70-80℃. While reducing boiler operating energy consumption, it achieves water resource recycling, demonstrating significant economic and environmental benefits. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of the overall system of the present invention; Figure 2 This is a schematic diagram of the iron removal device of the present invention.

[0017] In the diagram: 1. Steam boiler; 2. Primary high-temperature recovery tank; 3. Secondary low-temperature recovery tank; 4. Boiler condenser; 5. Iron removal device; 6. Stainless steel sintered felt filter element; 7. Polymerized permanent magnet rod; 8. Residual water collection inlet; 9. Iron removal water outlet; 10. Boiler feedwater tank; 11. High-temperature resin tank; 22. Normal temperature softening water pool; 33. Multi-effect distillation water machine; 44. Water bath sterilizer. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the waste heat and waste water recovery system for pharmaceutical industry boilers of the present invention mainly includes a steam boiler 1, a primary high-temperature recovery tank 2, a secondary low-temperature recovery tank 3, a boiler condenser 4, an iron removal device 5, a boiler feedwater tank 6, a high-temperature resin tank 7, and a normal-temperature softened water pool 8.

[0021] The continuous blowdown pipe of steam boiler 1 is connected to the inlet of primary high-temperature recovery tank 2, used to transport high-temperature wastewater with a temperature not lower than 130℃ to primary high-temperature recovery tank 2. Primary high-temperature recovery tank 2 is a vertical pressure vessel, and a tubular heat exchanger is installed inside. The tubular heat exchanger has a softened water inlet and a softened water outlet. The softened water inlet is connected to the ambient temperature softened water tank 8, and the softened water outlet of the tubular heat exchanger is connected to the first inlet of boiler feedwater tank 6. The top of primary high-temperature recovery tank 2 is provided with a steam outlet, which is connected to the second inlet of boiler feedwater tank 6 through a pipeline, used to introduce the steam generated during the heat exchange process into boiler feedwater tank 6 for auxiliary heating. The bottom of primary high-temperature recovery tank 2 is provided with a cooling wastewater outlet, which is connected to the inlet of secondary low-temperature recovery tank 3, used to transport wastewater whose temperature has dropped to below 75℃ after primary heat exchange to secondary low-temperature recovery tank 3.

[0022] The secondary cryogenic recovery tank 3 is an atmospheric pressure tank with an internal coil submerged in the wastewater. The coil has an ambient temperature softened water inlet and an outlet. The ambient temperature softened water inlet is connected to the ambient temperature softened water pool 8 to receive ambient temperature softened water below 30°C. The softened water outlet is connected to the inlet of the boiler condenser 4 to deliver softened water heated to approximately 40°C after secondary heat exchange to the boiler condenser 4. The bottom of the secondary cryogenic recovery tank 3 has an ambient temperature discharge port for discharging wastewater whose temperature has dropped to approximately 30°C after secondary heat exchange.

[0023] The boiler condenser 4 is used to exchange heat between the 40°C softened water from the secondary low-temperature recovery tank 3 and the high-temperature flue gas from the boiler, raising the temperature of the softened water to 70°C. The softened water outlet of the boiler condenser 4 is connected to the third inlet of the boiler feedwater tank 6.

[0024] The iron removal device 5 is used to receive secondary concentrated water and substandard water from the multi-effect distillation water machine 9, as well as high-temperature water from the water bath sterilizer 10. For example... Figure 2 As shown, the iron removal device 5 includes a housing, a stainless steel sintered felt filter element 51 disposed within the housing, and a polymeric permanent magnet rod 52 disposed downstream of the filter element. The polymeric permanent magnet rod 52 is externally sleeved with a stainless steel sleeve. The iron removal device 5 has a residual water collection inlet 53 and an iron removal water outlet 54. The residual water collection inlet 53 is connected to the secondary concentrate outlet and the unqualified water outlet of the multi-effect distillation water machine 9, and the high-temperature discharge port of the water bath sterilizer 10, respectively, for collecting residual water at a temperature of 60-80℃. The iron removal water outlet 54 is connected to the inlet of the high-temperature resin tank 7.

[0025] The high-temperature resin tank 7 is filled with high-temperature resistant, strong acid cation exchange resin, and its operating temperature range is 40-80℃. The outlet of the high-temperature resin tank 7 is connected to the fourth inlet of the boiler feedwater tank 6, and is used to transport softened water with a hardness of less than 0.03 mmol / L to the boiler feedwater tank 6.

[0026] The boiler feedwater tank 6 has a first inlet, a second inlet, a third inlet, and a fourth inlet, which are used to receive 75℃ softened water, steam, 70℃ flue gas heat exchange softened water, and treated waste water, respectively. The outlet of the boiler feedwater tank 6 is connected to the feedwater system of the steam boiler 1 to supply feedwater at a temperature of 70-80℃ to the boiler.

[0027] Based on the above system structure, the method for recovering waste heat and waste water from boilers in the pharmaceutical industry according to the present invention includes the following steps: S1, the continuous wastewater with a temperature not lower than 130℃ generated by the steam boiler 1 is fed into the primary high-temperature recovery tank 2. Inside the tank, the wastewater undergoes primary heat exchange with the ambient temperature softened water from the ambient temperature softened water tank 8 via a tubular heat exchanger. The high-temperature wastewater heats the softened water to 75℃ while its own temperature drops below 75℃. The 75℃ softened water is then transported to the boiler feedwater tank 6 through the first inlet. The steam generated in the primary high-temperature recovery tank 2 is introduced into the boiler feedwater tank 6 through the top steam outlet and the second inlet to provide auxiliary heating for the feedwater inside the tank.

[0028] S2, the wastewater whose temperature drops below 75°C after primary heat exchange enters the secondary low-temperature recovery tank 3. Inside the tank, the wastewater undergoes secondary heat exchange with ambient temperature softened water (below 30°C) from the ambient temperature softened water pool 8 through a coil submerged in the wastewater. The wastewater heats the softened water in the coil to approximately 40°C, while its own temperature further decreases to approximately 30°C before being discharged through the ambient temperature discharge port at the bottom. The 40°C softened water exits from the coil outlet and enters the boiler condenser 4.

[0029] S3, in the boiler condenser 4, softened water at 40°C exchanges heat with the high-temperature flue gas of the boiler. After absorbing the waste heat of the flue gas, the temperature rises to 70°C, and then it is transported to the boiler feedwater tank 6 through the third inlet.

[0030] S4 collects the secondary concentrate and substandard water produced by the multi-effect distillation water machine 9, as well as the high-temperature water (60-80℃) produced by the water bath sterilizer 10, and introduces it into the iron removal device 5 through the residual water collection inlet 53. The residual water first passes through the stainless steel sintered felt filter element 51 to filter solid impurities, and then flows through the polymerizable permanent magnet rod 52. Under the action of a strong magnetic field, the iron impurities in the water are adsorbed on the surface of the stainless steel sleeve, reducing the iron ion concentration in the effluent to below 0.3mg / L.

[0031] S5, the water after iron removal treatment enters the high-temperature resin tank 7 through the iron removal water outlet 54. Inside the high-temperature resin tank 7, the water comes into contact with a high-temperature resistant, strong acid cation exchange resin, and the calcium and magnesium ions in the water are replaced, reducing the hardness of the effluent to below 0.03 mmol / L. The softened water is then transported to the boiler feedwater tank 6 through the fourth inlet, where it is mixed with 75°C softened water obtained from the heat recovery step, 70°C flue gas heat exchange softened water, and diffused steam for use as boiler feedwater.

[0032] Example 1, In a practical application at a pharmaceutical company, the continuous wastewater discharge temperature of the steam boiler is approximately 135℃, with a flow rate of 2t / h. This wastewater enters the primary high-temperature recovery tank, where a tubular heat exchanger heats 3t / h of ambient temperature softened water (25℃) to 75℃, reducing the wastewater's own temperature to 72℃. The steam generated in the primary recovery tank (approximately 100℃) is then introduced into the boiler feedwater tank.

[0033] Wastewater cooled to 72℃ enters a secondary cryogenic recovery tank, where 2t / h of ambient temperature softened water (25℃) is heated to 40℃ via coils. The wastewater temperature drops to 32℃ before being discharged. The 40℃ softened water is then heated to 70℃ after exchanging heat with 180℃ boiler flue gas in the boiler condenser.

[0034] Meanwhile, the secondary concentrate (1.5t / h, 70℃) and substandard water (0.5t / h, 75℃) from the multi-effect distillation water machine, along with the discharge water from the water bath sterilizer (1t / h, 65℃), are combined and enter the iron removal device. After treatment by a stainless steel sintered felt filter element and a polymeric permanent magnet rod with a surface magnetic induction intensity of 0.8T, the iron ion concentration in the effluent is 0.25mg / L. It then enters a high-temperature resin tank for softening, resulting in an effluent hardness of 0.02mmol / L, before finally flowing into the boiler feedwater tank.

[0035] The mixed feedwater in the boiler feedwater tank has a temperature of 76℃, a hardness of 0.015 mmol / L, and an iron ion concentration of 0.25 mg / L, meeting the boiler feedwater standards and can be directly used in the boiler. Calculations show that this system reduces boiler fuel consumption by approximately 12% and fresh water consumption by approximately 30%.

[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A waste heat and waste water recovery system for boilers in the pharmaceutical industry, characterized in that, It includes a primary high-temperature recovery tank connected to a steam boiler, a secondary low-temperature recovery tank connected to the primary high-temperature recovery tank, a boiler condenser connected to the secondary low-temperature recovery tank, and a boiler feedwater tank connected to the primary high-temperature recovery tank and the boiler condenser respectively. The inlet of the primary high-temperature recovery tank is connected to the boiler continuous blowdown pipe to receive the boiler's continuous wastewater. The primary high-temperature recovery tank is equipped with a tubular heat exchanger, which has a softened water inlet and a softened water outlet. The primary high-temperature recovery tank has a steam outlet at the top and a cooling wastewater outlet at the bottom. The inlet of the secondary low-temperature recovery tank is connected to the cooling wastewater outlet at the bottom of the primary high-temperature recovery tank to receive the wastewater after the primary heat exchange. The secondary low-temperature recovery tank is equipped with a coil with a room temperature softened water inlet and a softened water outlet. The bottom of the secondary low-temperature recovery tank is equipped with a room temperature discharge port. The primary high-temperature recovery tank and the secondary low-temperature recovery tank are also connected to ambient temperature softening water pools. The boiler feedwater tank has a first inlet, a second inlet, a third inlet and a fourth inlet. The first inlet is connected to the softened water outlet of the tubular heat exchanger, the second inlet is connected to the steam outlet at the top of the primary high-temperature recovery tank, and the third inlet is connected to the softened water outlet of the boiler condenser. It also includes a high-temperature resin tank for receiving secondary concentrated water from a multi-effect distillation water machine, substandard water, and hot water from a water bath sterilizer. The high-temperature resin tank is connected to the boiler feedwater tank, and an iron removal device is connected in series at the inlet front end of the high-temperature resin tank.

2. The waste heat and waste water recovery system for pharmaceutical industry boilers as described in claim 1, characterized in that, The iron removal device includes a housing, a stainless steel sintered felt filter element disposed within the housing, and a polymeric permanent magnet rod disposed downstream of the filter element. The polymeric permanent magnet rod is covered with a stainless steel sleeve. The iron removal device has a residual water collection inlet and an iron removal water outlet.

3. A waste heat and waste water recovery system for pharmaceutical industry boilers as described in claim 2, characterized in that, The inlet of the high-temperature resin tank is connected to the iron removal water outlet of the iron removal device, and the outlet of the high-temperature resin tank is connected to the fourth water inlet of the boiler feedwater tank; the residual water collection inlet of the iron removal device is connected to the secondary concentrated water outlet and the unqualified water outlet of the multi-effect distillation water machine, as well as the high-temperature discharge outlet of the water bath sterilizer.

4. A waste heat and waste water recovery system for pharmaceutical industry boilers as described in claim 1, characterized in that, The primary high-temperature recovery tank is a pressure vessel, while the secondary low-temperature recovery tank is an atmospheric pressure tank. The coil is submerged in the wastewater of the secondary low-temperature recovery tank.

5. A waste heat and waste water recovery system for pharmaceutical industry boilers as described in claim 1, characterized in that, The inlet of the boiler condenser is connected to the softened water outlet of the coil, which is used to exchange heat between the 40℃ softened water and the high-temperature flue gas of the boiler to 70℃.

6. A method for recovering waste heat and waste water from boilers in the pharmaceutical industry, using a waste heat and waste water recovery system for pharmaceutical boilers as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Boiler wastewater with a temperature not lower than 130℃ is continuously fed into the primary high-temperature recovery tank. The softened water undergoes primary heat exchange with the tubular heat exchanger inside the tank. The softened water is heated to 75℃ and then transported to the boiler feedwater tank through the first inlet. At the same time, the steam generated in the primary high-temperature recovery tank is introduced into the boiler feedwater tank through the second inlet. The wastewater after primary heat exchange is fed into the secondary low-temperature recovery tank, where it undergoes secondary heat exchange with room-temperature softened water through the coils inside the tank. The softened water is heated to about 40°C and then fed into the boiler condenser, where it exchanges heat with the high-temperature flue gas of the boiler to raise the temperature to 70°C. The wastewater is then transported to the boiler feedwater tank through the third inlet. At the same time, the wastewater is cooled to room temperature and discharged through the outlet. The secondary concentrated water and substandard water produced by the multi-effect distillation water machine, as well as the high-temperature water produced by the water bath sterilizer, are collected and passed into the iron removal device. The iron impurities are removed by the stainless steel sintered felt filter element and polymeric permanent magnet rod, so that the iron ion concentration in the effluent is less than 0.3 mg / L. After iron removal, the water is passed into a high-temperature resin tank for softening treatment. The hardness of the effluent is reduced to less than 0.03 mmol / L. The softened water is then transported to the boiler feedwater tank through the fourth inlet and mixed with the softened water obtained from the heat recovery step as boiler feedwater.

7. A method for recovering waste heat and waste water from boilers in the pharmaceutical industry as described in claim 6, characterized in that, The wastewater temperature is reduced to 30°C after heat exchange in the secondary cryogenic recovery tank before being discharged.

8. A method for recovering waste heat and waste water from boilers in the pharmaceutical industry as described in claim 6, characterized in that, The room-temperature softened water entering the secondary cryogenic recovery tank is below 30°C.

9. A method for recovering waste heat and waste water from boilers in the pharmaceutical industry as described in claim 6, characterized in that, Polymer permanent magnet rods adsorb ferrous impurities in water using magnetic force, and iron ions are adsorbed onto the surface of stainless steel sleeves.

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