Feed pelletizing cooling system

Abstract

The present invention relates to a feed pelletizing cooling system, comprising: a cooling room, in which a pelletizing cooler for cooling pellets is arranged, and the pelletizing cooler has a cooling air inlet connected to the inner space of the cooling room; an air inlet channel, which is arranged on the cooling room to allow external cooling air to enter the cooling room; and a heating device, which is located in the cooling room and arranged corresponding to the air inlet channel to heat the cooling air in the air inlet channel. A cooling room is configured corresponding to the pelletizing cooler, and a heating device is arranged corresponding to the air inlet channel on the cooling room to heat the cooling air entering the cooling room and the pelletizing cooler. Since the heating device can be arranged in the cooling room, and the overall size of the cooling room is relatively large, it is convenient to arrange a heating device that meets the heating requirements, and it is convenient to apply it in specific actual production.

Description

Technical Field

[0001] The present invention generally relates to the field of feed pelleting cooling technology. More specifically, the present invention relates to a feed pelleting cooling system. Background Art

[0002] At present, the feed industry production is gradually shifting towards feed pellets, so that more and more livestock breeding manufacturers and feed production plants use pelleting equipment to produce pellet feed. In the process of feed pelleting, the raw grain needs to be fully sterilized at high temperature and matured and tempered, resulting in the pellet feed leaving the machine temperature usually being around 80°, and also containing a certain amount of moisture, which is easy to form hot and humid pellets. Such hot and humid pellets are easy to break and are also prone to mildew during storage. In response to this problem, pelleting coolers are mainly used to perform air-cooling, dehumidification and cooling treatment on the pellets to obtain feed pellets with better quality.

[0003] The structure of the pelletizing cooler is disclosed in the utility model patent with authorization announcement number CN209470427U, which includes a cooling bin, a flap-type discharge device is provided in the cooling bin, a collecting hopper is provided at the bottom of the cooling bin, an air outlet channel and an exhaust fan are provided at the upper part of the cooling bin, and an air inlet is provided on the cooling bin to facilitate the introduction of cooling air into the cold zone bin. When in use, the pellet feed to be cooled enters the cooling bin and is supported by the flap-type discharge device in the cooling bin. The exhaust fan works to draw the external cooling air into the cooling bin to cool the pellet feed. After cooling is completed, the flap-type discharge device rotates, the flap turns over to discharge, and the pellet feed enters the collecting hopper and is finally discharged. In order to improve the cooling efficiency, a heating device is provided at the position corresponding to the air inlet below the flap-type discharge device to heat the air entering the cooling bin.

[0004] The above-mentioned cooler heating method is limited by the size of the cooler itself, which cannot be made very large. The heating efficiency for cooling air with low outside temperature is relatively low, and the heating efficiency is poor. For example, in the winter in the northeast region, the relatively humid and cold outside air enters the cooling bin and easily forms condensation water in the cooling bin, which easily produces wet materials. Wet materials entering the air outlet duct are very likely to cause blockage, which requires frequent clearing, affecting normal working efficiency. Summary of the invention

[0005] In view of the above-mentioned scheme with low heating efficiency, the present invention provides a feed pelletizing cooling system to solve the technical problem of low heating efficiency of heating cooling air by a heating device arranged inside a cooler in the prior art.

[0006] To solve the above problems, the present invention provides the following technical solutions: a feed pelletizing cooling system, comprising: a cooling room, in which a pelletizing cooler for cooling pellets is arranged, the pelletizing cooler having a cooling air inlet connected to the inner space of the cooling room; an air inlet channel, which is arranged on the cooling room to allow external cooling air to enter the cooling room; and a heating device, which is located in the cooling room and arranged corresponding to the air inlet channel to heat the cooling air in the air inlet channel.

[0007] As a further improvement, the heating device includes a fluid heat exchanger, and the steam heater is connected to a workshop steam return pipe so that hot steam is supplied from the workshop steam return pipe, thereby heating the cooling air in the air inlet channel when flowing through the steam heater.

[0008] As a further improvement, the fluid heat exchanger has a water inlet and a water outlet, the workshop steam return pipe is connected to the water inlet of the fluid heat exchanger, a return water collecting tank is arranged in the cooling room, the return water collecting tank is connected to the water outlet of the fluid heat exchanger, the return water collecting tank is connected to a return water pipeline for connecting to a boiler water supply tank, and the return water pipeline is provided with a return water pump for pumping water in the return water collecting tank into the boiler water supply tank.

[0009] As a further improvement, the workshop steam return pipe has a heating branch and a return branch, the heating branch is connected to the water inlet of the fluid heat exchanger, and the return branch is used to communicate with the boiler feed water tank.

[0010] As a further improvement, a buffer coil is provided in the return water collection tank, and the buffer coil has an inlet and an outlet. The water outlet of the fluid heat exchanger is connected to the inlet of the buffer coil through a heating return water pipeline, and the outlet of the buffer coil is connected to the inner cavity of the return water collection tank.

[0011] As a further improvement, the fluid heat exchanger has a water inlet and a water outlet, a return water collecting tank is arranged in the cooling room, the workshop steam return water pipe is connected to the return water collecting tank, the return water collecting tank is connected to the water inlet of the fluid heat exchanger through a heating water supply pipeline, a heating water supply pump is provided on the heating water supply pipeline, and the return water collecting tank is connected to the water outlet of the fluid heat exchanger through a heating return water pipeline.

[0012] As a further improvement, the return water collecting tank is connected to a circulating water heat exchange device, which has a circulating water flow channel and a workshop steam flow channel for realizing heat exchange; the inlet of the circulating water flow channel is connected to the return water collecting tank through a first pipeline, and the first pipeline is provided with a circulating water pump for pumping water in the return water collecting tank to the circulating water heat exchange device; the outlet of the circulating water flow channel is connected to the return water collecting tank through a second pipeline, so that the heated circulating water flows back to the return water collecting tank; the inlet of the workshop steam flow channel is connected to the workshop steam return pipeline; the outlet of the workshop steam flow channel is connected to the return water collecting tank through a third pipeline or is connected to the second pipeline through a third pipeline.

[0013] As a further improvement, the circulating water heat exchange device includes a first heat exchanger and a second heat exchanger arranged in series, the first heat exchanger having a first circulating water channel and a first steam channel for realizing heat exchange, the second heat exchanger having a second circulating water channel and a second steam channel for realizing heat exchange, the circulating water flow channel includes the first circulating water channel and the second circulating water channel arranged in communication, the workshop steam flow channel includes the first steam channel and the second steam channel arranged in communication, the inlet of the circulating water flow channel is arranged on the first heat exchanger, the outlet of the circulating water flow channel is arranged on the second heat exchanger, the inlet of the workshop steam flow channel is arranged on the second heat exchanger, and the outlet of the workshop steam flow channel is arranged on the first heat exchanger.

[0014] As a further improvement, the return water collection tank is connected to a return water pipeline for connecting to a boiler feed water tank, and the return water pipeline is provided with a return water pump for pumping water in the return water collection tank into the boiler feed water tank.

[0015] As a further improvement, the air inlet passage is an air inlet window provided on the cooling room, a dust removal structure is provided in the air inlet window, and the heating device is arranged corresponding to the air outlet of the air inlet window.

[0016] The beneficial effect is that in the feed pelletizing cooling system provided by the present invention, a cooling room is configured corresponding to the pelletizing cooler, and a heating device is provided corresponding to the air inlet channel on the cooling room, so as to heat the cooling air entering the cooling room and the pelletizing cooler. Since the heating device can be arranged in the cooling room, and the overall size of the cooling room is relatively large, it is convenient to arrange the heating device that meets the heating demand, and it is convenient to apply it in specific actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 This is a structural schematic diagram of Example 1 of the feed pelletizing cooling system provided by the present invention;

[0019] Figure 2 This is a schematic structural diagram of a return water heating device in Example 2 of a feed pelletizing cooling system provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the return water heating device in Example 3 of the feed pelletizing cooling system provided by the present invention;

[0021] Figure 4 This is a schematic structural diagram of a return water heating device in Example 4 of a feed pelletizing cooling system provided by the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the return water heating device in Example 5 of the feed pelletizing cooling system provided by the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the return water heating device in Example 6 of the feed pelletizing cooling system provided by the present invention;

[0024] Figures 1 to 6 The solid arrow in the middle shows the direction of fluid flow. Figure 1 The dashed arrow in the middle shows the flow direction of pellet feed.

[0025] Description of reference numerals:

[0026] 100, cooling room; 200, granulation cooler; 300, exhaust duct; 400, heating device; 500, air inlet duct; 1, fluid heat exchanger; 2, workshop steam return pipe; 3, heating branch; 4, return branch; 5, return main pipe; 6, boiler water tank; 7, sewage pipe; 8, return pipe; 9, return pump; 10, liquid level sensor; 11, return water collection tank; 12, overflow steam pipe; 13, heating return pipe; 14, controller; 15, buffer coil; 16, heating water supply pump; 17, heating water supply pipe; 20, circulating water pump; 21, first pipe; 22, first heat exchanger; 23, steam return pipe; 24, circulating water pipe; 25, second pipe; 26, second heat exchanger; 27, third pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] Corresponding to the method in the prior art of setting a heating structure inside the granulating cooler to heat the cooling air, the present invention configures a cooling room corresponding to the granulating cooler, and sets an air inlet channel on the cooling room to introduce cooling air, and the cooling air is heated by a heating device arranged in the cooling room corresponding to the air inlet channel. Since the cooling room has a large space, it is convenient to arrange a heating device that meets the actual heating needs according to actual needs, so as to ensure reliable heating efficiency and is no longer limited to the volume of the granulating cooler itself.

[0029] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0030] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0031] Example 1 of the feed pelletizing cooling system provided by the present invention:

[0032] like Figure 1 As shown, the feed pelleting system in this embodiment includes a cooling room 100, which can be used to accommodate a pelleting cooler 200 to prevent cooling. The pelleting cooler 200 is used to receive the pellet feed after heating and maturation to cool the pellet feed.

[0033] The cooling room 100 can be made of brick, concrete, steel structure board house or modular assembly house. Under the condition of ensuring safety and sufficient space, it is sufficient to ensure that the granulating cooler 200 and other components that need to be connected can be arranged in the cooling room.

[0034] The pelletizing cooler 200 may be a commercially available product, or may be a pelletizing cooler structure disclosed in the prior art, such as a dehumidifying cooler disclosed in the utility model patent with the authorization announcement number CN209470427U. The pelletizing cooler 200 has a cooling bin, and a receiving structure is arranged at the lower part of the cooling bin. The receiving structure is used to receive the falling feed pellets, so as to facilitate cooling of the pellet feed in the cooling bin. After the cooling set time, the receiving structure is opened, so that the pellet feed falls and is finally discharged through the discharge port of the pelletizing cooler 200.

[0035] In this embodiment, an air cooling structure is provided on the pelletizing cooler 200, a cooling air inlet and an exhaust passage 300 are provided on the pelletizing cooler 200, and a fan is provided at the exhaust passage 300 to exhaust cooling air. The cooling air inlet is connected to the inner space of the cooling room, and when the fan is working, the cooling air in the cooling room can be sucked into the cooling bin and discharged through the exhaust passage, thereby realizing air cooling of the pellet feed.

[0036] As an implementation means, the fan can be arranged at the exhaust duct, or the fan can be arranged at the cooling air inlet to ensure that the cooling air in the cooling air can enter the cooling bin for normal air cooling.

[0037] like Figure 1 As shown, the cooling room 100 is provided with an air inlet channel 500, and the air inlet channel 500 is used to allow external cooling air to enter the cooling room. In specific implementation, an air inlet window can be set on the wall of the cooling room 100, and a fan can be set in the air inlet window to facilitate the introduction of external cooling air into the cooling room 100. Moreover, a dust removal structure is also set in the air inlet window to filter the cooling air entering the cooling room 100. The setting position and number of the air inlet channel can be arranged according to actual needs, and the number can be one or more than two. Specifically, the air inlet channel 500 can be set on the surrounding walls of the cooling warehouse, and the air inlet channel can also be arranged on the roof of the cooling room.

[0038] In order to avoid the problem of a large amount of condensed water being easily generated due to a large temperature difference between the cooling air and the pellet feed, in this embodiment, a heating device 400 is arranged in the cooling room 100 corresponding to the air inlet channel 500, and the heating device 400 heats the cooling air in the air inlet channel 500. When the external cooling air enters the cooling room through the air inlet channel 500, the heating device 400 heats the cooling air, which can increase the temperature of the cooling air entering the cooling room in the pelletizing cooler, and avoid the problem of a large amount of condensed water being generated due to a large temperature difference between the cooling air and the feed pellets.

[0039] Since the space size of the cooling room is relatively large, it is convenient to arrange a larger volume of heating devices according to the heating needs, so as to meet the heating needs of the cooling air at a relatively low cost.

[0040] When the heating device is implemented, an electric heating element can be used to generate heat to heat the cooling air flowing through the heating device. The heating device has an electric heating element, which can achieve heating through one or two of the following methods: resistance heating, induction heating, infrared heating, etc., and utilizes heat exchange between the cooling air and the electric heating element to achieve heating of the cooling air.

[0041] In the feed pelleting cooling system provided in this embodiment, a cooling room 100 is configured corresponding to the pelleting cooler 200, and a heating device 400 is provided corresponding to the air inlet channel 500 on the cooling room 100, so as to heat the cooling air entering the cooling room 100 and then the pelleting cooler 200. Since the heating device can be arranged in the cooling room, and the overall size of the cooling room is relatively large, it is convenient to arrange a heating device that meets the heating requirements, and it is convenient to apply it in specific actual production.

[0042] Example 2 of the feed pelletizing cooling system provided by the present invention:

[0043] The main difference between this embodiment and Example 1 is that in the feed pelletizing cooling system in this embodiment, the heating device is a return water heating device.

[0044] like Figure 2 As shown, the heating device 400 in this embodiment is a return water heating device, which can use the steam return water recovered and transported by the workshop steam return water pipeline 2 to heat the cooling air. The heating device 400 includes a fluid heat exchanger 1, which is connected to the workshop steam return water pipeline 2, so that the steam return water is supplied by the workshop steam return water pipeline 2, so that the cooling air in the air inlet channel 500 is heated when it flows through the steam heater to achieve heat exchange. The fluid heat exchanger can use a coil heat exchanger or a fin radiator to form a heat source, so as to reliably heat the cooling air in the air inlet channel.

[0045] The fluid heat exchanger 1 itself has a hot steam channel, which is used for hot steam to flow through. A water inlet is set at one end of the hot steam channel, and a water outlet is set at the other end. The water inlet and the water outlet are both set on the fluid heat exchanger 1. The water inlet of the hot steam channel is connected to the workshop steam return water pipeline 2, so that the steam return water transported by the workshop steam return water pipeline 2 can directly enter the fluid heat exchanger 1.

[0046] Corresponding to the fluid heat exchanger 1, a return water collection tank 11 is arranged in the cooling room 100, and the water outlet of the fluid heat exchanger 1 is connected to the return water collection tank 11 through the heating return water pipeline 13. In this way, the water vapor mixture output from the workshop steam return water pipeline 2 is cooled and injected into the return water collection tank 11 after heat exchange with the cooling air through the fluid heat exchanger 1. At this time, most of the fluid is liquid and a small part is gaseous. Liquid water can be temporarily stored in the return water collection tank 11, and a small part of the gaseous steam can be discharged through the overflow steam exhaust pipe 12. The overflow steam exhaust pipe 12 is provided with a corresponding valve, which controls the opening and closing of the overflow steam exhaust pipe.

[0047] As for the liquid water in the return water collection tank, the return water collection tank 11 is connected with a return water pipeline 8, and the return water pipeline 8 is used to connect the boiler water supply tank 6. A return water pump 9 is provided on the return water pipeline 8, and the return water pump 9 is used to pump the liquid water in the return water collection tank into the boiler water supply tank 6, and the boiler water supply tank 6 is used to replenish softened water to the workshop boiler.

[0048] In specific implementation, the liquid level sensor 10 can be used in combination with the controller 14 to realize automatic control of the return water pump 9. Figure 2 As shown, a liquid level sensor 10 is provided on the return water collection tank 11, and the liquid level sensor 10 is connected to a controller 14 to transmit the detected data to the controller 14. The controller 14 can control the return water pump 9 to start when the liquid level in the return water collection tank 11 rises to a set position, and automatically stop the return water pump 9 after setting the working time. In specific implementation, the start and stop of the return water pump can also be controlled by cooperating with a high and low liquid level transmitter.

[0049] like Figure 2 As shown, the workshop steam return water pipe 2 has a heating branch 3 and a return water branch 4. In specific implementation, the heating branch 3 is connected to the water inlet of the fluid heat exchanger 1, and the return water branch 4 is used to connect to the boiler feed water tank 6. Considering the specific implementation situation, the return water branch 4 can be combined with the return water pipe 8 to the return main line 5, and the return main line 5 centrally transports the fluid into the boiler feed water tank 6. The heating branch and the return water branch are set in consideration of the actual working conditions of the workshop. When the cooling air does not need to be heated, the fluid output from the workshop equipment return water pipe can be directly returned to the boiler feed water tank.

[0050] For the convenience of cleaning, a sewage pipe 7 is provided on the return main line 5, and a corresponding valve is provided on the sewage pipe 7 to control the opening and closing of the sewage pipe. When the sewage pipe is implemented, a sampling valve port can be provided, which is convenient for sampling and testing. When the water quality is qualified, it can be returned to the boiler water supply tank normally. When the water quality is unqualified, sewage is discharged.

[0051] When the feed pelletizing cooling system provided in this embodiment is working, when the cooling air needs to be heated, steam and hot water are injected into the fluid heat exchanger 1 through the workshop steam return pipe 2 to efficiently heat the cooling air flowing through the fluid heat exchanger.

[0052] Example 3 of the feed pelletizing cooling system provided by the present invention:

[0053] The main difference between it and Example 2 is that: in Example 2, the fluid injected into the fluid heat exchanger enters the return water collection tank, while in this embodiment, a buffer coil is arranged in the return water collection tank to reduce steam overflow and water wave impact.

[0054] like Figure 3As shown, a buffer coil 15 is provided in the return water collection tank 11, and the buffer coil 15 has an inlet and an outlet. The outlet of the fluid heat exchanger 1 is connected to the inlet of the buffer coil 15 through the heating return water pipeline 13, and the outlet of the buffer coil 15 is connected to the inner cavity of the return water collection tank 11. The water vapor mixture output from the workshop steam return water pipeline 2 is cooled after heat exchange with the cooling air through the fluid heat exchanger 1 and injected into the buffer coil 15. The buffer circulation in the buffer coil can avoid directly rushing into the return water collection tank to form a water wave impact, and can also form further cooling in the gradual flow process to reduce steam overflow.

[0055] In Examples 2 and 3, the workshop steam return water pipeline directly injects steam return water into the fluid heat exchanger, and uses the steam return water's own pressure to achieve flow.

[0056] Example 4 of the feed pelletizing cooling system provided by the invention:

[0057] The main difference between it and Example 2 is that: in Example 2, the workshop steam return pipe directly injects steam into the fluid heat exchanger, while in this embodiment, the workshop steam return pipe first injects the steam fluid into the return water collection tank, and then uses the heating water supply pump to send hot water into the fluid heat exchanger to heat the cooling air flowing through.

[0058] like Figure 4 As shown, the return water heating device in the feed pelletizing system provided in this embodiment mainly includes a fluid heat exchanger 1, a return water collection tank 11 and a circulating water heat exchange device.

[0059] A return water collection tank 11 is arranged in the cooling room 100, and the workshop steam return water pipeline 2 is connected to the return water collection tank 11 to send the steam return water into the return water collection tank 11. The hot water in the return water collection tank 11 is pumped into the fluid heat exchanger 1 to realize the heating operation of the return water heating device.

[0060] Specifically, the fluid heat exchanger 1 itself has a water inlet and a water outlet, the return water collection tank 11 is connected to the water inlet of the fluid heat exchanger 1 through the heating water supply pipeline 17, a heating water supply pump 16 is provided on the heating water supply pipeline 17, and the return water collection tank 11 is connected to the water outlet of the fluid heat exchanger 1 through the heating return water pipeline 13. Under the action of the heating water supply pump 16, the hot water in the return water collection tank 11 can be continuously sent to the fluid heat exchanger 1 to heat the cooling air.

[0061] When the temperature of the steam return water transported by the workshop steam return water pipeline is high, if the steam return water is directly sent to the return water collection tank, it is easy to cause too much steam in the return water collection tank. Correspondingly, a circulating water heat exchange device is provided in this embodiment. The circulating water heat exchange device is connected to the return water collection tank 11, and the hot water already in the return water collection tank 11 is used to exchange heat with the steam return water, thereby reducing the temperature of the steam return water injected into the return water collection tank, so as to reduce the amount of steam in the return water collection tank.

[0062] In order to achieve heat exchange between the hot water in the return water collection tank and the steam return water, the circulating water heat exchange device needs to have a circulating water flow channel and a workshop steam flow channel that can achieve heat exchange.

[0063] In specific implementation, the inlet of the circulating water flow channel is connected to the return water collection tank 11 through the first pipeline 21, and a circulating water pump 20 is arranged on the first pipeline 21, and the circulating water pump 20 pumps the water in the return water collection tank 11 to the circulating water heat exchange device. The outlet of the circulating water flow channel will be connected to the return water collection tank 11 through the second pipeline 25, so that the heated circulating water flows back to the corresponding return water collection tank 11.

[0064] The inlet of the workshop steam flow channel needs to be connected to the workshop steam return pipe 23, so that the workshop steam return pipe 23 injects steam return water into the workshop steam flow channel, and the outlet of the workshop steam flow channel is connected to the return water collection tank 11 through the third pipe 27.

[0065] like Figure 4 As shown, in this embodiment, the circulating water heat exchange device specifically includes a first heat exchanger 22 and a second heat exchanger 26 arranged in series, the first heat exchanger 22 has a first circulating water channel and a first steam channel for realizing heat exchange, and the second heat exchanger 26 has a second circulating water channel and a second steam channel for realizing heat exchange.

[0066] The circulating water flow channel includes a first circulating water channel and a second circulating water channel. The first circulating water channel and the second circulating water channel are connected through a circulating water pipeline 24. The circulating water pipeline 24 is correspondingly arranged between the first heat exchanger 22 and the second heat exchanger 26.

[0067] The workshop steam flow channel includes a first steam channel and a second steam channel. The first steam channel and the second steam channel are connected through a steam return pipe 23. The steam return pipe 23 is also correspondingly arranged between the first heat exchanger 22 and the second heat exchanger 26.

[0068] In addition, the inlet of the circulating water flow channel is arranged on the first heat exchanger 22, so that the first heat exchanger 22 is connected to the return water collection tank 11 through the first pipeline 21. The outlet of the circulating water flow channel is arranged on the second heat exchanger 26, so that the second heat exchanger 26 is connected to the return water collection tank 11 through the second pipeline 25.

[0069] The inlet of the workshop steam flow channel is arranged on the second heat exchanger 26, so that the workshop steam return water pipeline 2 can directly inject the steam return water into the second heat exchanger 26. The outlet of the workshop steam flow channel is arranged on the first heat exchanger 22, which also facilitates the first heat exchanger 22 to communicate with the return water collection tank 11 through the third pipeline 27.

[0070] In this embodiment, the first heat exchanger 22 can be a plate heat exchanger, and the second heat exchanger 26 can be a heat collection barrel, which includes a barrel body, and the barrel body is provided with an internal pipe for circulating water to flow through, and the inner cavity of the barrel body is for steam return water to flow through, so as to achieve heat exchange between steam return water and circulating water in the internal pipe. For those skilled in the art, as another specific implementation means, the first heat exchanger and the second heat exchanger can both be plate heat exchangers, or fin heat exchangers, etc., and the specific structure is not limited, as long as the corresponding steam channels and circulating water channels that can achieve heat exchange are respectively provided in the heat exchanger.

[0071] When the circulating water heat exchange device provided in this embodiment is used, the workshop steam return water pipeline 2 injects the steam return water into the second heat exchanger 26, and then injects it into the return water collection tank 11 through the second steam channel, the steam return water pipeline 23, the first steam channel and the third pipeline 27. Under the action of the circulating water pump 20, the circulating water in the return water collection tank 11 flows back to the corresponding return water collection tank 11 through the first pipeline 21, the first circulating water channel, the circulating water pipeline 24, the second circulating water channel and the second pipeline 25. The steam return water and the circulating water perform heat exchange inside the first heat exchanger 22 and the second heat exchanger 26, thereby effectively reducing the temperature of the steam return water and reducing the amount of steam injected into the steam return water collection tank 11.

[0072] In addition, as for the return water collection tank 11, a return water pipeline 8, a sewage pipe 7 and an overflow steam pipe 12 are also provided thereon.

[0073] The return water pipeline 8 is used to connect the boiler water supply tank 6. The return water pipeline 8 is provided with a return water pump 9 to pump the water in the return water collection tank 11 into the corresponding boiler water supply tank 6. In specific implementation, the automatic control of the return water pump can be achieved by using a liquid level sensor in combination with a controller. For example, a liquid level sensor is provided on the return water collection tank, and the liquid level sensor is connected to the controller to transmit the detected data to the controller. The controller can control the start of the return water pump when the liquid level in the return water collection tank rises to a set position, and automatically stop the return water pump after setting the working time. In specific implementation, the start and stop of the return water pump can also be controlled by cooperating with high and low liquid level transmitters.

[0074] The sewage pipe 7 is usually arranged at the bottom of the return water collection tank 11 to achieve sewage cleaning. The overflow steam pipe 12 can usually be arranged at the top of the return water collection tank 11 to achieve safe exhaust and safe overflow to reduce danger.

[0075] In the return water heating device provided in this embodiment, the return water collection tank 11 is used as a buffering measure for steam return water, which is convenient for use in occasions where the steam return water in the workshop is large. The circulating water heat exchange device is used to cool the steam return water to prevent excessive steam from entering the return water collection tank 11 and causing safety impact.

[0076] Example 5 of the feed pelletizing cooling system provided by the present invention:

[0077] The main difference between it and Example 4 is that in Example 4, the second heat exchanger is connected to the return water collection tank through the third pipeline, while in this embodiment, the second heat exchanger is connected to the second pipeline through the third pipeline to be connected to the return water collection tank.

[0078] like Figure 5 As shown, the outlet of the workshop steam flow channel is arranged at the second heat exchanger 26, and the outlet of the workshop steam flow channel is connected with the second pipeline 25 through the third pipeline 27, and finally connected with the return water collection tank 11 through the second pipeline 25. In this way, the steam return water flowing out of the workshop steam flow channel is converged into the second pipeline 25 through the third pipeline 27, and flows back to the corresponding return water collection tank 11 through the second pipeline 25 together with the circulating water discharged from the outlet of the circulating water flow channel.

[0079] Example 6 of the feed pelletizing cooling system provided by the present invention:

[0080] The main difference between it and Example 4 is that in Example 4, a circulating water heat exchange device is configured corresponding to the return water collection tank, while in this embodiment, the circulating water heat exchange device is omitted.

[0081] In this embodiment, Figure 6As shown, the workshop steam return water pipe 2 is directly connected to the return water collection tank 11, and the steam return water can be directly injected into the return water collection tank 11. Compared with the solution in Example 4, the solution of omitting the circulating water heat exchange device in this embodiment is more suitable for places where the steam content in the steam return water is relatively low.

[0082] Example 7 of the feed pelletizing cooling system provided by the present invention:

[0083] The main difference between it and Example 4 is that in Example 4, the circulating water heat exchange device adopts two heat exchangers arranged in series, while in this embodiment, the circulating water heat exchange device only includes one heat exchanger, which can adopt a plate heat exchanger, a heat collection barrel or a fin heat exchanger, which can realize heat exchange between circulating water and steam return water.

[0084] As another specific implementation means, the circulating water heat exchange device may also include more than three heat exchangers arranged in series, and the serial arrangement method thereof may adopt the serial arrangement method of two heat exchangers in Example 4, which will not be described in detail here.

[0085] In Examples 4 to 7, the return water collection tank arranged in the cooling room is used to receive the steam return water injected from the workshop steam return water pipeline, and the water in the return water collection tank is always in a circulating flow state. Therefore, the temperature of each area in the return water collection tank is not much different and is relatively uniform.

[0086] In the feed pelleting cooling system provided by the present invention, a dedicated cooling room is directly configured for the feed pelleting cooler, and a heating device is set at the corresponding air inlet channel in the cooling room to meet the cooling air heating requirements reliably and efficiently. When this feed pelleting cooling system is applied to relatively cold areas, the cooling air can be reliably heated to avoid a large amount of condensed water in the cooler due to a large temperature difference between the cooling air and the pellet feed. In addition, the use of workshop steam return water in combination with a fluid heat exchanger to heat the cooling air not only has high heating efficiency, but also allows the workshop steam return water to be reasonably treated, reduces steam discharge, saves heat energy, and protects the environment.

[0087] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of this specification, which are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0088] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0089] Although this specification has shown and described a plurality of embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A feed pelletizing cooling system, characterized in that: include: A cooling room, in which a pelletizing cooler for cooling pellets is arranged, and the pelletizing cooler has a cooling air inlet communicated with the inner space of the cooling room; An air inlet channel, which is arranged on the cooling room to allow external cooling air to enter the cooling room; as well as A heating device, which is located in the cooling room and arranged corresponding to the air inlet channel to heat the cooling air in the air inlet channel; The heating device comprises a fluid heat exchanger, which is connected to a workshop steam return pipe, so that hot steam is supplied from the workshop steam return pipe, thereby causing the cooling air in the air inlet channel to be heated when flowing through the fluid heat exchanger; The fluid heat exchanger has a water inlet and a water outlet, a return water collection tank is arranged in the cooling room, the workshop steam return water pipeline is connected to the return water collection tank, the return water collection tank is connected to the water inlet of the fluid heat exchanger through a heating water supply pipeline, a heating water supply pump is provided on the heating water supply pipeline, and the return water collection tank is connected to the water outlet of the fluid heat exchanger through a heating return water pipeline; The return water collection tank is connected to a circulating water heat exchange device, which has a circulating water flow channel and a workshop steam flow channel for realizing heat exchange; The inlet of the circulating water flow channel is connected to the return water collection tank through a first pipeline, and the first pipeline is provided with a circulating water pump for pumping water in the return water collection tank to the circulating water heat exchange device; The outlet of the circulating water flow channel is connected to the return water collection tank through a second pipeline, so that the heated circulating water flows back to the return water collection tank; The inlet of the workshop steam flow channel is connected to the workshop steam return pipeline; The outlet of the workshop steam flow channel is connected to the return water collection tank through a third pipeline or is connected to the second pipeline through a third pipeline.

2. The feed pelletizing cooling system according to claim 1, characterized in that: The fluid heat exchanger has a water inlet and a water outlet, the workshop steam return pipe is connected to the water inlet of the fluid heat exchanger, a return water collecting tank is arranged in the cooling room, the return water collecting tank is connected to the water outlet of the fluid heat exchanger, the return water collecting tank is connected to a return water pipeline for connecting to a boiler water supply tank, and a return water pump is provided on the return water pipeline for pumping water in the return water collecting tank into the boiler water supply tank.

3. The feed pelletizing cooling system according to claim 2, characterized in that: The workshop steam return water pipeline has a heating branch and a return water branch. The heating branch is connected to the water inlet of the fluid heat exchanger, and the return water branch is used to communicate with the boiler water supply tank.

4. The feed pelletizing cooling system according to claim 2, characterized in that: A buffer coil is provided in the return water collection tank, and the buffer coil has an inlet and an outlet. The water outlet of the fluid heat exchanger is connected to the inlet of the buffer coil through a heating return water pipeline, and the outlet of the buffer coil is connected to the inner cavity of the return water collection tank.

5. The feed pelletizing cooling system according to claim 1, characterized in that: The circulating water heat exchange device comprises a first heat exchanger and a second heat exchanger arranged in series, the first heat exchanger having a first circulating water channel and a first steam channel for realizing heat exchange, and the second heat exchanger having a second circulating water channel and a second steam channel for realizing heat exchange; The circulating water flow channel includes the first circulating water channel and the second circulating water channel which are connected and arranged, and the workshop steam flow channel includes the first steam channel and the second steam channel which are connected and arranged; The inlet of the circulating water flow channel is arranged on the first heat exchanger, the outlet of the circulating water flow channel is arranged on the second heat exchanger, the inlet of the workshop steam flow channel is arranged on the second heat exchanger, and the outlet of the workshop steam flow channel is arranged on the first heat exchanger.

6. The feed pelletizing cooling system according to any one of claims 1 to 5, characterized in that: The return water collection tank is connected to a return water pipeline for connecting to a boiler water supply tank, and a return water pump for pumping water in the return water collection tank into the boiler water supply tank is arranged on the return water pipeline.

7. The feed pelletizing cooling system according to any one of claims 1 to 5, characterized in that: The air inlet passage is an air inlet window provided on the cooling room, a dust removal structure is arranged inside the air inlet window, and the heating device is arranged corresponding to the air outlet of the air inlet window.

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