A waste heat recovery system

Abstract

The application discloses a waste heat recycling system, which solves the technical problem of heat waste in the process of recovering bacterial protein in the prior art. The waste heat recycling system comprises a main heat exchanger, a water storage tank, a blower and a drying tower. The main heat exchanger has a first medium channel and a second medium channel. The medium in the first medium channel and the medium in the second medium channel exchange heat through the main heat exchanger. The water inlet of the first medium channel is communicated with a steam condensate pipe of a boiler. The water storage tank is communicated with the water outlet of the first medium channel. The water outlet of the water storage tank is connected with a CIP system. The air outlet of the blower is communicated with the inlet of the second medium channel. The air inlet of the drying tower is communicated with the outlet of the second medium channel. At least one heating device is arranged between the outlet of the second medium channel and the air inlet of the drying tower. The application can reasonably recover the waste heat of the production line and reduce the production cost.

Description

Technical Field

[0001] This application belongs to the field of drying system technology, specifically relating to a waste heat recovery system. Background Technology

[0002] In industrial production related to the recovery of bacterial protein, hot air systems are often used to dry the produced bacterial protein, which results in high production costs and a significant amount of heat waste throughout the production process without proper recovery and utilization. Summary of the Invention

[0003] To address the technical problem of heat waste in the current process of recovering bacterial protein, this application provides a waste heat recovery system.

[0004] In a first aspect of this application, a waste heat recovery system is provided, comprising: The main heat exchanger has a first medium channel and a second medium channel. The medium in the first medium channel and the medium in the second medium channel exchange heat through the main heat exchanger. The inlet of the first medium channel is connected to the steam condensate pipe of the boiler. A water storage tank is connected to the outlet of the first medium channel, and the outlet of the water storage tank is connected to a CIP system. A blower, wherein the outlet of the blower is connected to the inlet of the second medium channel; A drying tower, wherein the air inlet of the drying tower is connected to the outlet of the second medium channel, and at least one heating device is provided between the outlet of the second medium channel and the air inlet of the drying tower.

[0005] In some embodiments, the outlet of the water storage tank is also connected to the inlet of the boiler.

[0006] In some embodiments, the outlet of the first medium channel is also connected to the inlet of the boiler.

[0007] In some implementations, the CIP system includes: An alkali solution tank, wherein the water supply pipe of the alkali solution tank is connected to the outlet of the water storage tank; An acid tank, wherein the water supply pipe of the acid tank is connected to the outlet of the water storage tank; A hot water tank, wherein the water supply pipe of the hot water tank is connected to the outlet of the water storage tank.

[0008] In some embodiments, a heater is provided inside the water storage tank.

[0009] In some embodiments, two liquid pumps are provided between the steam condensate pipe and the inlet of the first medium channel, and the two liquid pumps are connected in parallel.

[0010] In some embodiments, the heating device between the outlet of the second medium channel and the air inlet of the drying tower includes a primary steam heater, a secondary steam heater, and a hot air furnace arranged in sequence.

[0011] In some embodiments, the condensate pipe of the primary steam heater and the condensate pipe of the secondary steam heater are connected to the inlet of the first medium channel.

[0012] In some embodiments, at least one preheating heater is provided between the main heat exchanger and the blower.

[0013] In some embodiments, at least one of the preheating heaters includes a first preheating heat exchanger and a second preheating heat exchanger, wherein the first preheating heat exchanger is connected to the exhaust pipe of the hot blast furnace; and the second preheating heat exchanger is connected to the flash condensate pipe.

[0014] The waste heat recovery system provided according to one or more embodiments of this application exchanges the heat in the condensate generated by the boiler to the air in the second medium channel through the main heat exchanger to preheat the air intake required for the drying tower, thereby reducing the cost of heating the air. The condensate after heat exchange has a low impurity content and high cleanliness. The condensate after heat exchange is collected in a water storage tank and supplied to the CIP system to clean other equipment in industrial production, saving water resources and reducing the cost of obtaining clean water. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the waste heat recovery system in an embodiment of this application is shown; Explanation of reference numerals in the attached drawings: 1-boiler, 2-liquid pump, 3-main heat exchanger, 4-water storage tank, 41-heater, 5-CIP system, 51-acid tank, 52-alkali tank, 53-hot water tank, 6-blower, 7-drying tower, 8-first-stage steam heater, 9-second-stage steam heater, 10-hot blast furnace, 11-first preheating heat exchanger, 12-second preheating heat exchanger. Detailed Implementation

[0017] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0018] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1 According to a first aspect of this application, a waste heat recovery system is provided, including a main heat exchanger 3, a water storage tank 4, a blower 6, and a drying tower 7. The main heat exchanger 3 has a first medium channel and a second medium channel. The medium in the first medium channel and the medium in the second medium channel exchange heat through the main heat exchanger 3. The inlet of the first medium channel is connected to the steam condensate pipe of the boiler 1. The water storage tank 4 is connected to the outlet of the first medium channel. The outlet of the water storage tank 4 is connected to a CIP (cleaning in place) system. The CIP system 5 is used to clean equipment in industrial production, such as a disc centrifuge used for mycelial protein recovery.

[0019] The air outlet of the blower 6 is connected to the inlet of the second medium channel; the air inlet of the drying tower 7 is connected to the outlet of the second medium channel, and at least one heating device is also provided between the outlet of the second medium channel and the air inlet of the drying tower 7.

[0020] Boiler 1 is used to generate steam. When boiler 1 outputs steam for use by other devices, some of the steam will condense into water and be discharged from the steam condensate pipe of boiler 1. At this time, the condensate in the steam condensate pipe has a temperature close to 100 degrees Celsius. The steam condensate flow rate of the production line reaches 20 cubic meters per hour. This part of the condensate is recovered and the heat in the condensate is exchanged with the air in the second medium channel through the main heat exchanger 3 to preheat the air intake required for the drying tower 7, thereby reducing the cost of heating the air, that is, reducing the consumption of fuels such as coal and gas. The condensate after heat exchange has a low impurity content and high cleanliness. Therefore, the condensate after heat exchange is collected in the water storage tank 4 and supplied to the CIP system 5 to clean other equipment in industrial production, saving water resources and reducing the cost of obtaining clean water sources.

[0021] In some embodiments, the outlet of the water storage tank 4 is also connected to the inlet of the boiler 1. That is, the unused condensate in the water storage tank 4 can be directly used as water for the boiler 1 to participate in the steam generation process again. The condensate contains few minerals and is not prone to scale formation, which can reduce the frequency of cleaning the boiler 1, reduce production costs, and timely discharge of the condensate in the water storage tank 4 can ensure that the condensate flowing out of the main heat exchanger 3 can be stored.

[0022] In some embodiments, the outlet of the first medium channel is also connected to the inlet of the boiler 1. When the water storage tank 4 stores a lot of condensate, the condensate discharged from the first medium channel can be directly entered into the boiler 1 for reuse. At this time, the condensate still has a certain temperature, and the heat required to generate steam is low, which can reduce the cost of the production line.

[0023] In some embodiments, the CIP system 5 includes an alkali tank 52, an acid tank 51, and a hot water tank 53. The water supply pipe of the alkali tank 52 is connected to the outlet of the water storage tank 4; the water supply pipe of the acid tank 51 is connected to the outlet of the water storage tank 4; and the water supply pipe of the hot water tank 53 is connected to the outlet of the water storage tank 4.

[0024] In some embodiments, a heater 41 is provided inside the water storage tank 4 to heat the condensate in the water storage tank 4 so that the temperature of the condensate is suitable for use by the CIP system 5.

[0025] In some embodiments, two liquid pumps 2 are installed between the steam condensate pipe and the inlet of the first medium channel. The two liquid pumps 2 are connected in parallel. If one liquid pump 2 fails, the other liquid pump 2 can pump the condensate into the main heat exchanger 3 to avoid the system shutdown caused by the failure of the liquid pump 2, thereby reducing the losses caused by the system shutdown.

[0026] In some embodiments, the heating device between the outlet of the second medium channel and the air inlet of the drying tower 7 includes a primary steam heater 8, a secondary steam heater 9, and a hot air furnace 10 arranged sequentially. The air is heated sequentially by the primary steam heater 8, the secondary steam heater 9, and the hot air furnace 10 until the required temperature of the drying tower 7 is reached to dry the material.

[0027] In some embodiments, the condensate pipes of the primary steam heater 8 and the secondary steam heater 9 are connected to the inlet of the first medium channel. The steam source for the primary steam heater 8 and the secondary steam heater 9 is the boiler 1. When the primary steam heater 8 and the secondary steam heater 9 heat the air, condensate will also condense on the inner walls of their pipes. Therefore, both the primary steam heater 8 and the secondary steam heater 9 have condensate pipes to discharge the condensate. In this application, this portion of the condensate is collected in the main heat exchanger 3 to recover the heat from the condensate. Of course, if the temperature of the condensate discharged from the primary steam heater 8 and the secondary steam heater 9 is low, the condensate pipes of the primary steam heater 8 and the secondary steam heater 9 can be connected to the water storage tank 4.

[0028] In some embodiments, at least one preheating heater is provided between the main heat exchanger 3 and the blower 6 to preheat the air required for the drying tower 7.

[0029] In some embodiments, at least one preheating heater includes a first preheating heat exchanger 11 and a second preheating heat exchanger 12. The first preheating heat exchanger 11 is connected to the exhaust pipe of the hot blast furnace 10; the second preheating heat exchanger 12 is connected to the flash condensate pipe. It is understood that the hot blast furnace 10, as the last device for heating air, also emits exhaust gas with high heat content. Therefore, the exhaust gas from the hot blast furnace 10 is recovered and utilized through the first preheating heat exchanger 11, thereby reducing costs. The flash condensate pipe is connected to a steam flash tank to collect the condensate from the steam flash tank. After heat exchange in the second preheating heat exchanger 12, the condensate is used to preheat the air, improving heating efficiency and reducing the cost of heating the air.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0034] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A waste heat recovery system, characterized in that, include: The main heat exchanger has a first medium channel and a second medium channel. The medium in the first medium channel and the medium in the second medium channel exchange heat through the main heat exchanger. The inlet of the first medium channel is connected to the steam condensate pipe of the boiler. A water storage tank is connected to the outlet of the first medium channel, and the outlet of the water storage tank is connected to a CIP system. A blower, wherein the outlet of the blower is connected to the inlet of the second medium channel; A drying tower, wherein the air inlet of the drying tower is connected to the outlet of the second medium channel, and at least one heating device is provided between the outlet of the second medium channel and the air inlet of the drying tower.

2. The waste heat recovery system according to claim 1, characterized in that, The outlet of the water storage tank is also connected to the inlet of the boiler.

3. The waste heat recovery system according to claim 2, characterized in that, The outlet of the first medium channel is also connected to the inlet of the boiler.

4. The waste heat recovery system according to claim 1, characterized in that, The CIP system includes: An alkali solution tank, wherein the water supply pipe of the alkali solution tank is connected to the outlet of the water storage tank; An acid tank, wherein the water supply pipe of the acid tank is connected to the outlet of the water storage tank; A hot water tank, wherein the water supply pipe of the hot water tank is connected to the outlet of the water storage tank.

5. The waste heat recovery system according to claim 4, characterized in that, The water storage tank is equipped with a heater.

6. The waste heat recovery system according to claim 1, characterized in that, Two liquid pumps are installed between the steam condensate pipe and the inlet of the first medium channel, and the two liquid pumps are connected in parallel.

7. The waste heat recovery system according to claim 1, characterized in that, The heating device between the outlet of the second medium channel and the air inlet of the drying tower includes a primary steam heater, a secondary steam heater, and a hot air furnace arranged in sequence.

8. The waste heat recovery system according to claim 7, characterized in that, The condensate pipe of the primary steam heater and the condensate pipe of the secondary steam heater are connected to the inlet of the first medium channel.

9. The waste heat recovery system according to claim 1, characterized in that, At least one preheating heater is provided between the main heat exchanger and the blower.

10. The waste heat recovery system according to claim 9, characterized in that, At least one of the preheating heaters includes a first preheating heat exchanger and a second preheating heat exchanger, wherein the first preheating heat exchanger is connected to the exhaust pipe of the hot air furnace; and the second preheating heat exchanger is connected to the flash condensate pipe.

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