Steam condensate separation and recovery system

Abstract

The utility model belongs to the field of sterilization technology of pharmaceutical industry, concretely relates to a steam condensate separation and recovery system, including sterilization cabinet, the inside top of sterilization cabinet installs spray pipe, one end of spray water circulation pipe is connected with spray pipe, and the other end is connected with the water outlet at the bottom of sterilization cabinet, and the cooling heat exchanger, the heating heat exchanger are connected in series on spray water circulation pipe, the cooling heat exchanger is installed between the water outlet at the bottom of sterilization cabinet and the heating heat exchanger, and the heating heat exchanger is installed between the cooling heat exchanger and spray pipe, cooling water circulation pipe connects the cooling heat exchanger with cooling tower, one end of condensate pipe is connected with the heating heat exchanger, and the other end is connected with boiler, one end of steam pipe is connected with the heating heat exchanger, and the other end is connected with boiler. Can solve the condensate produced after steam heating circulating spray water in the prior art, directly mixes with cooling circulating water in the cooling process, leads to the hardness of steam condensate to increase significantly, cannot satisfy the water quality requirement of boiler water supply, and the technical problem of unable recycling.

Description

Technical Field

[0001] This utility model belongs to the field of sterilization technology in the pharmaceutical industry, and specifically relates to a steam condensate separation and recovery system. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] In the production of upright soft bottle large-volume parenteral solutions, a large-volume parenteral solution sterilizer is required to heat the circulating water to 121°C using steam. The high-temperature circulating water is then used to spray and sterilize the product (i.e., upright soft bottle large-volume parenteral solutions) to ensure product quality.

[0004] In existing technologies, most sterilization cabinets use a single plate heat exchanger to achieve the heating and cooling of the circulating spray water inside the cabinet. Specifically, the spray water circulation pipe is connected to the first inlet and outlet of the plate heat exchanger, the cooling water circulation pipe is connected to the second inlet and outlet of the plate heat exchanger, and the steam pipe and condensate pipe are also connected to the second inlet and outlet of the plate heat exchanger. During the operation of the sterilization cabinet, the condensate generated after the steam heats the circulating spray water will directly mix with the cooling circulating water during the cooling process.

[0005] The above solution has some drawbacks: The condensate produced after the steam heating circulating spray water mixes directly with the cooling circulating water during the cooling process. The cooling circulating water usually contains various minerals and other impurities. After mixing, the hardness of the steam condensate increases significantly, failing to meet the water quality requirements for boiler feedwater. This results in a large amount of steam condensate and its contained heat not being recovered and utilized, causing water waste and energy loss. Some enterprises use pure water as cooling circulating water, which requires the preparation of large quantities of pure water. Furthermore, the cooling water and steam water are still mixed, posing a risk of mixed impurities, which also increases the enterprise's production costs and energy consumption burden. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a steam condensate separation and recovery system that can solve the technical problem in the prior art where the condensate generated after steam heating and circulating spraying water directly mixes with the cooling circulating water during the cooling process, resulting in a significant increase in the hardness of the steam condensate, which cannot meet the water quality requirements of boiler feed water and cannot be recycled.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A steam condensate separation and recovery system is provided, including a sterilization cabinet with a spray pipe installed at the top inside the sterilization cabinet; one end of a spray water circulation pipe is connected to the spray pipe, and the other end is connected to the water outlet at the bottom of the sterilization cabinet; a cooling heat exchanger and a heating heat exchanger are connected in series on the spray water circulation pipe. The cooling heat exchanger is installed between the water outlet at the bottom of the sterilizer and the heating heat exchanger; the heating heat exchanger is installed between the cooling heat exchanger and the spray pipe; the cooling water circulation pipe connects the cooling heat exchanger and the cooling tower. One end of the condensate pipe is connected to the heating heat exchanger, and the other end is connected to the boiler; one end of the steam pipe is connected to the heating heat exchanger, and the other end is connected to the boiler.

[0008] Preferably, it also includes a PLC controller, and a spray water circulation pump is installed on the spray water circulation pipe between the water outlet at the bottom of the sterilizer and the cooling heat exchanger. The spray water circulation pump is connected to the PLC controller.

[0009] Preferably, both the cooling heat exchanger and the heating heat exchanger include two inlets, one is a first inlet and the other is a second inlet; both include two outlets, one is a first outlet and the other is a second outlet.

[0010] Preferably, the first inlet of the cooling heat exchanger is connected to the water outlet at the bottom of the sterilizer via a spray water circulation pipe, the first outlet of the cooling heat exchanger is connected to the first inlet of the heating heat exchanger via a spray water circulation pipe, and the first outlet of the heating heat exchanger is connected to the spray pipe via a spray water circulation pipe.

[0011] Preferably, the cooling water circulation pipe includes a cooling water inlet pipe and a cooling water return pipe. The cooling water inlet pipe is connected to the second inlet of the cooling heat exchanger, and the cooling water return pipe is connected to the second outlet of the cooling heat exchanger. The cooling water return pipe and the cooling water inlet pipe are connected to the cooling tower. A cooling water circulation pump is installed on the cooling water return pipe, and the cooling water circulation pump is connected to a PLC controller.

[0012] Preferably, the steam pipe is connected to the second inlet of the heating heat exchanger, and the condensate pipe is connected to the second outlet of the heating heat exchanger.

[0013] Preferably, a condensate tank is installed on the condensate pipe, a vertical multistage pump is installed on the condensate pipe after the condensate tank, a water level controller is installed in the condensate tank, and the water level controller is connected to the vertical multistage pump.

[0014] Preferably, the heating heat exchanger and the cooling heat exchanger are plate heat exchangers.

[0015] Preferably, a first temperature sensor is installed on the spray water circulation pipe between the heating heat exchanger and the spray pipe, and a second temperature sensor is installed on the spray water circulation pipe between the heating heat exchanger and the cooling heat exchanger.

[0016] Preferably, the first temperature sensor and the second temperature sensor are connected to the PLC controller.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are: This invention connects a cooling heat exchanger and a heating heat exchanger in series on the spray water circulation pipe. The cooling heat exchanger is also connected to the cooling water circulation pipe, and the heating heat exchanger is connected to the steam pipe and the condensate pipe. This allows the spray water, cooling water, steam, and steam condensate to circulate independently, avoiding direct mixing of the condensate generated after the steam heats the circulating spray water with the cooling circulating water during the cooling process. This ensures that the steam condensate meets the water quality requirements for boiler feedwater and allows for the recovery and utilization of steam condensate and its heat, reducing the production costs and energy consumption burden for enterprises. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is an overall schematic diagram of the steam condensate separation and recovery system according to an embodiment of the present invention; In the picture: 1. Sterilization cabinet; 2. Spray pipe; 3. Spray water circulation pipe; 4. Boiler; 5. Steam pipe; 6. Heating heat exchanger; 7. Cooling tower; 8. Cooling water circulation pipe; 9. Cooling heat exchanger; 10. Condensate pipe; 11. Condensate tank; 12. First temperature sensor; 13. Second temperature sensor. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] Definitions: Water level controller: refers to the control of high and low water levels through mechanical or electronic methods. It can control solenoid valves, water pumps, etc., and become an automatic water level controller or water level alarm, thereby realizing semi-automation or full automation.

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] This embodiment discloses a steam condensate separation and recovery system, such as Figure 1 As shown, the device includes a sterilization cabinet 1, with a spray pipe 2 installed at the top of the interior of the sterilization cabinet 1. The spray pipe 2 is connected to a spray water circulation pipe 3, which transports circulating spray water to the spray pipe 2 for spray sterilization of the products inside the sterilization cabinet 1. Figure 1As shown, one end of the spray water circulation pipe 3 is connected to the spray pipe 2, and the other end is connected to the bottom outlet of the sterilizer 1. After spraying the product, the spray water is discharged from the bottom outlet of the sterilizer 1 into the spray water circulation pipe 3 to ensure that the spray water does not mix with the water in other pipes.

[0024] like Figure 1 As shown, two heat exchangers are connected in series on the spray water circulation pipe 3 of the sterilizer 1: a cooling heat exchanger 9 and a heating heat exchanger 6. The heating heat exchanger 6 heats the spray water in the spray water circulation pipe 3 to ensure that the spray water reaches the set sterilization temperature during sterilization, thereby sterilizing the products in the sterilizer 1. The cooling heat exchanger 9 cools the spray water after sterilization, causing the temperature of the sterilizer to drop rapidly. This is because if upright soft bottle large-volume infusions are exposed to high temperatures for a long time, they may deform or soften, leading to damage to the seal or changes in the material. Moreover, rapid cooling allows the sterilized products to be removed as soon as possible so that the next batch of products can be sterilized quickly.

[0025] In this embodiment, the sterilization temperature of the spray water during sterilization is set to 121 degrees Celsius.

[0026] like Figure 1 As shown, the cooling heat exchanger 9 is installed between the bottom outlet of the sterilizer 1 and the heating heat exchanger 6, and the heating heat exchanger 6 is installed between the cooling heat exchanger 9 and the spray pipe 2. The first inlet and outlet of the cooling heat exchanger 9 are connected to the spray water circulation pipe 3, and the second inlet and outlet of the cooling heat exchanger 9 are connected to the cooling water circulation pipe 8, which is connected to the cooling tower 7. When it is necessary to cool the spray water, the cooling water in the cooling water circulation pipe 8 circulates between the cooling tower 7 and the cooling heat exchanger 9 to quickly lower the temperature of the sterilized spray water.

[0027] like Figure 1 As shown, the first inlet and outlet of the heating heat exchanger 6 are connected to the spray water circulation pipe 3, and the second inlet and outlet of the heating heat exchanger 6 are connected to the steam pipe 5 and the condensate pipe 10. When it is necessary to heat the spray water, the steam in the steam pipe 5 flows through the heating heat exchanger 6 to heat the spray water. The steam condenses into water in the heating heat exchanger 6, and the steam condensate flows into the condensate pipe 10, so that the temperature of the spray water for sterilization quickly reaches the set temperature.

[0028] like Figure 1 As shown, one end of the condensate pipe 10 is connected to the heating heat exchanger 6, and the other end is connected to the boiler 4. One end of the boiler 4 is connected to the condensate pipe 10, and the other end is connected to the steam pipe 5. The boiler 4 is used to heat pure water and generate steam. The steam condensate recovered in the condensate pipe 10 is not mixed with other pipes, which ensures that the steam condensate meets the water quality requirements of the boiler 4. Moreover, the steam condensate has a large amount of heat that can be recovered and reused, thereby reducing the energy consumption of the boiler 4.

[0029] In this embodiment, by installing two heat exchangers in series on the spray water circulation pipe 3, and installing the cooling water circulation pipe 8 on the cooling heat exchanger 9, and installing the steam pipe 5 and condensate pipe 10 on the heating heat exchanger 6, the condensate generated after steam heating the circulating spray water can be prevented from directly mixing with the cooling circulating water during the cooling process. This avoids an increase in the hardness of the steam condensate and still meets the water quality requirements for boiler feedwater. This allows the steam condensate and its contained heat to be recovered and reused, avoiding water waste and energy loss. This solves the technical problem in the prior art where the condensate generated after steam heating the circulating spray water directly mixes with the cooling circulating water during the cooling process, leading to a significant increase in the hardness of the steam condensate, which fails to meet the water quality requirements for boiler feedwater and cannot be recovered and reused. At the same time, it eliminates the need to refine large amounts of pure water for cooling water, reducing the enterprise's production costs and energy consumption burden.

[0030] like Figure 1 As shown, a spray water circulation pump (shown in the figure) is installed on the spray water circulation pipe 3 between the water outlet at the bottom of the sterilizer 1 and the cooling heat exchanger 9 to drive the spray water to circulate in the spray water circulation pipe 3.

[0031] In this embodiment, the first inlet and outlet of the cooling heat exchanger 9 and the heating heat exchanger 6 include a first inlet and a first outlet, and the second inlet and outlet include a second inlet and a second outlet.

[0032] like Figure 1 As shown, the first inlet of the cooling heat exchanger 9 is connected to the outlet at the bottom of the sterilizer 1 via a spray water circulation pipe 3. The first outlet of the cooling heat exchanger 9 is connected to the first inlet of the heating heat exchanger 6 via a spray water circulation pipe 3. The first outlet of the heating heat exchanger 6 is connected to the spray pipe 2 via a spray water circulation pipe 3. It is easy to understand that the spray water is sprayed from the spray pipe 2 and collected at the bottom of the sterilizer 1. During the sterilization stage, it can be rapidly heated to the set sterilization temperature via the heating heat exchanger 6 for sterilization, or it can be rapidly cooled (to room temperature) via the cooling heat exchanger 9 after sterilization, allowing the product to be removed as soon as possible. In the spray water circulation pipe 3, the spray water will not mix with water from other pipes, thus ensuring the purity of the spray water.

[0033] like Figure 1 As shown, the second inlet and outlet of the cooling heat exchanger 9 are connected to the cooling water circulation pipe 8. Specifically, the cooling water circulation pipe 8 includes a cooling water inlet pipe and a cooling water return pipe. The cooling water inlet pipe is connected to the second inlet of the cooling heat exchanger 9, and the cooling water return pipe is connected to the second outlet of the cooling heat exchanger 9. The cooling water passes through the cooling heat exchanger 9 to quickly cool the spray water.

[0034] like Figure 1As shown, the cooling water return pipe and cooling water inlet pipe of the cooling water circulation pipe 8 are also connected to the cooling tower 7. After the cooling water enters the cooling heat exchanger 9 to absorb the heat of the spray water, it enters the cooling tower 7 to cool and release the heat, and then enters the cooling heat exchanger 9 again to absorb the heat of the spray water.

[0035] It should be noted that a cooling water circulation pump (not shown in the figure) is installed on the cooling water return pipe to drive the cooling water to flow continuously in the cooling water circulation pipe 8, which can continuously cool the spray water.

[0036] like Figure 1 As shown, one end of the steam pipe 5 is connected to the boiler 4, and the other end is connected to the second inlet of the heating heat exchanger 6. One end of the condensate pipe 10 is connected to the second outlet of the heating heat exchanger 6, and the other end is connected to the boiler 4. The high-temperature steam produced by the boiler 4 enters the heating heat exchanger 6 to heat the spray water passing through it. The condensate of the high-temperature steam returns to the boiler 4 from the condensate pipe 10 for reheating.

[0037] like Figure 1 As shown, a condensate tank 11 is installed on the condensate pipe 10. The condensate tank 11 is used to collect pure steam condensate. A vertical multistage pump (not shown in the figure) is installed on the condensate pipe 10 between the condensate tank 11 and the boiler 4. A water level controller is installed in the condensate tank 11, and the water level controller is connected to the vertical multistage pump (full name: vertical multistage centrifugal pump). When the water level in the condensate tank 11 reaches the upper water level of the water level controller, the water level controller controls the vertical multistage pump to start, delivering the condensate to the boiler 4. When the water level in the condensate tank 11 reaches the lower water level of the water level controller, the water level controller controls the vertical multistage pump to shut down. The water level controller can be a reed switch water level controller.

[0038] In this embodiment, the boiler has a water supply pipe to ensure sufficient boiler water, and a condensate pipe 10 is used to recover condensate into the boiler, saving heat and water resources. The boiler can deliver steam to the heating heat exchanger 6 through the steam pipe 5.

[0039] In this embodiment, the heating heat exchanger 6 and the cooling heat exchanger 9 are plate heat exchangers. Plate heat exchangers are chosen because they have the characteristics of high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application and long service life.

[0040] In this embodiment, multiple temperature sensors are installed on the spray water circulation pipe 3 (temperature sensors used on pipes generally use NTC thermistors as the sensing element, which have advantages such as high sensitivity, strong stability, corrosion resistance, long life, and convenient installation). Specifically, the first temperature sensor 12 is installed on the spray water circulation pipe 3 between the heating heat exchanger 6 and the spray pipe 2 to monitor the heating temperature of the spray water; the second temperature sensor 13 is installed on the spray water circulation pipe 3 between the heating heat exchanger 6 and the cooling heat exchanger 9 to monitor the cooling temperature of the spray water.

[0041] In this embodiment, a regulating valve (not shown) is installed on the steam pipe 5, and a regulating valve (not shown) is also installed on the cooling water circulation pipe 8. In this embodiment, the regulating valves installed on the steam pipe 5 and the cooling water circulation pipe 8 are either PID valves or angle seat valves. The PID valves are all solenoid valves, and the angle seat valves are all pneumatic valves.

[0042] In this embodiment, a steam condensate separation and recovery system also includes a PLC controller (not shown in the figure). Two temperature sensors are connected to the PLC controller via wires to transmit the monitored temperature of the spray water during heating or cooling to the PLC controller.

[0043] In this embodiment, the PLC controller can be connected to the spray water circulation pump, cooling water circulation pump, or regulating valve via a power line, contactor, circuit breaker, or frequency converter. It is used to control the start and stop of the spray water circulation pump or cooling water circulation pump, or the opening and closing of the regulating valve. Specifically, when the regulating valve is a solenoid valve, the PLC controller sends a signal to the contactor to control the opening and closing of the solenoid valve; when the angle seat valve is a pneumatic valve, the PLC controller sends a signal to the solenoid valve in the pneumatic valve switching air path to control the start and stop of the pneumatic valve by switching the air path. This is achievable with existing technology.

[0044] In this embodiment, the PLC controller is also connected to an HMI (Human-Machine Interface). Sterilization is selected in the HMI, and the PLC controller starts the spray water circulation pump and opens the regulating valve on the steam pipe 5. Based on the temperature data detected by the first temperature sensor, the PLC controller controls the opening degree of the regulating valve on the steam pipe 5 to heat the spray water to the set sterilization temperature. During heat preservation, when the temperature data detected by the first temperature sensor is lower than the set sterilization temperature, the PLC controller controls the opening degree of the regulating valve on the steam pipe 5 to ensure that the spray water is within the required temperature range.

[0045] In this embodiment, after sterilization is completed, the PLC controller controls the regulating valve on the steam pipe 5 to close and the regulating valve on the cooling water circulation pipe to open, so as to cool the spray water; when the temperature data detected by the second temperature sensor reaches the cooling set temperature, the regulating valve on the cooling water circulation pipe closes and the spray water circulation pump stops.

[0046] Based on the current production situation in the upright soft bottle workshop of the production area, the number of sterilization cabinets can reach 24 per day, which requires 30 tons of steam per day. The recovered steam condensate is calculated at a pure water price of 15 yuan / ton, which can reduce boiler water production by 30 tons per day. The total water production cost reduction is 30 tons * 15 yuan / ton = 450 yuan / day, and the annual water production cost reduction is 450 yuan / day * 330 days = 148,500 yuan / year.

[0047] In addition, the recovered steam condensate contains heat, which can be used as boiler feedwater to reduce the energy consumption required for boiler heating, improve energy efficiency, and reduce the company's production costs. 30 tons of high-temperature condensate can be recovered daily, totaling 30 tons * 330 days = 9900 tons / year. If the recovered water temperature is 90℃ and the boiler water production temperature is 30℃, the temperature difference is 90 - 30 = 60℃. The annual recovered heat is 9900 tons * 60℃ = 594 million kcal. Natural gas has a calorific value of 8500 kcal. Assuming an 80% thermal efficiency, the annual natural gas savings are 594 million kcal / 8,500 kcal / 80% = 87400 m³. At a natural gas price of 4 yuan per ton, the annual natural gas cost savings are 87400 * 4 = 349600 yuan. After the renovation, the annual savings from the recycling of steam condensate is 148,500 yuan + 349,600 yuan = 498,100 yuan (four hundred and ninety-eight thousand one hundred yuan).

[0048] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A steam condensate separation and recovery system, characterized in that, The system includes a sterilization cabinet, with a spray pipe installed at the top inside the sterilization cabinet; one end of a spray water circulation pipe is connected to the spray pipe, and the other end is connected to the water outlet at the bottom of the sterilization cabinet; a cooling heat exchanger and a heating heat exchanger are connected in series on the spray water circulation pipe. The cooling heat exchanger is installed between the water outlet at the bottom of the sterilizer and the heating heat exchanger, and the heating heat exchanger is installed between the cooling heat exchanger and the spray pipe; the cooling water circulation pipe connects the cooling heat exchanger and the cooling tower. One end of the condensate pipe is connected to the heating heat exchanger, and the other end is connected to the boiler; one end of the steam pipe is connected to the heating heat exchanger, and the other end is connected to the boiler.

2. The steam condensate separation and recovery system as described in claim 1, characterized in that, It also includes a PLC controller, and a spray water circulation pump is installed on the spray water circulation pipe between the water outlet at the bottom of the sterilizer and the cooling heat exchanger. The spray water circulation pump is connected to the PLC controller.

3. The steam condensate separation and recovery system as described in claim 1, characterized in that, Both the cooling heat exchanger and the heating heat exchanger include two inlets, one is the first inlet and the other is the second inlet; they also each include two outlets, one is the first outlet and the other is the second outlet.

4. The steam condensate separation and recovery system as described in claim 3, characterized in that, The first inlet of the cooling heat exchanger is connected to the water outlet at the bottom of the sterilizer via a spray water circulation pipe, the first outlet of the cooling heat exchanger is connected to the first inlet of the heating heat exchanger via a spray water circulation pipe, and the first outlet of the heating heat exchanger is connected to the spray pipe via a spray water circulation pipe.

5. A steam condensate separation and recovery system as described in claim 3, characterized in that, The cooling water circulation pipe includes a cooling water inlet pipe and a cooling water return pipe. The cooling water inlet pipe is connected to the second inlet of the cooling heat exchanger, and the cooling water return pipe is connected to the second outlet of the cooling heat exchanger. The cooling water return pipe and the cooling water inlet pipe are connected to the cooling tower. A cooling water circulation pump is installed on the cooling water return pipe, and the cooling water circulation pump is connected to a PLC controller.

6. The steam condensate separation and recovery system as described in claim 3, characterized in that, The steam pipe is connected to the second inlet of the heating heat exchanger, and the condensate pipe is connected to the second outlet of the heating heat exchanger.

7. The steam condensate separation and recovery system as described in claim 1, characterized in that, A condensate tank is installed on the condensate pipe, a vertical multistage pump is installed on the condensate pipe after the condensate tank, a water level controller is installed in the condensate tank, and the water level controller is connected to the vertical multistage pump.

8. The steam condensate separation and recovery system as described in claim 1, characterized in that, The heating heat exchanger and the cooling heat exchanger are plate heat exchangers.

9. A steam condensate separation and recovery system as described in claim 1, characterized in that, A first temperature sensor is installed on the spray water circulation pipe between the heating heat exchanger and the spray pipe, and a second temperature sensor is installed on the spray water circulation pipe between the heating heat exchanger and the cooling heat exchanger.

10. A steam condensate separation and recovery system as described in claim 9, characterized in that, The first temperature sensor and the second temperature sensor are connected to the PLC controller.

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