Drying temperature control system

Abstract

The utility model discloses a drying temperature control system, and belongs to the technical field of temperature control. The drying temperature control system comprises at least two sets of heating assemblies and one set of cooling assembly, and the structures of the heating assemblies are the same. Each heating assembly and each cooling assembly are each independently provided with an expansion groove and a heat exchanger, a water inlet of each expansion groove is connected with a water supplementing main pipe, and a water outlet is connected with a water inlet of the heat exchanger. A heat exchanger of the heating assembly is connected with a low-pressure steam header pipe, and a hot water outlet of the heat exchanger is connected with a dryer through a circulating hot water inlet pipe. Heat exchangers of the cooling assembly are connected with a chilled water header pipe, hot water outlets of the heat exchangers are connected with a dryer through a circulating cold water inlet pipe, and thermometers are arranged at water outlets of the heat exchangers. By the adoption of the drying temperature control system, the heating / cooling water temperature can be accurately controlled, materials can be dried within the shortest time, and the drying work efficiency and the drying quality are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature control, and more specifically relates to a temperature control system used for drying powdered chemical raw materials. Background Art

[0002] Drying temperature control systems are widely used in the chemical, food and other industries. The drying system used for powdered chemical raw materials usually includes a heating system and a cooling system. The heating system uses hot water to heat the heating plate, directly heating the material on the crawler set above the heating plate. The crawler is driven by a motor to achieve batch continuous heating of powdered materials. Similarly, the cooling system also uses chilled water to cool the material on the crawler. The existing drying system has the following problems during use:

[0003] (1) A set of heating systems has low heating efficiency and is difficult to meet the needs of mass heating of materials. The heating cycle is long and the heating efficiency is low, which affects the output and causes high production costs.

[0004] (2) The existing heating system and cooling system are not reasonably designed, the temperature control accuracy is poor, the heating or cooling effect is unsatisfactory, and the various indicators of the powder after leaving the dryer are difficult to meet the set requirements.

[0005] After searching, the Chinese patent application number is: 201520494883.6, the application date is: July 8, 2015, and the name of the invention is: heat pump vacuum belt dryer. In this application, the heat source for drying preheating and drying raw materials of the dryer is provided by the heat released by the condensers of two heat pump systems, and the cooling of the raw materials and the condensation of water vapor after drying are provided by absorbing heat from the evaporators of the two heat pump systems. This application can solve the problems of high energy consumption and high water consumption of existing dryers by optimizing the structure of the dryer, but its technical solution still cannot solve the problems of relatively poor drying output, drying efficiency and drying effect of existing dryers. Utility Model Content

[0006] 1. Problem to be solved

[0007] In view of the shortcomings of existing dryers, such as poor heating efficiency and difficulty in meeting the needs of batch heating of materials, the utility model provides a drying temperature control system, which can effectively increase the drying amount and thus improve the drying efficiency by optimizing the structure of the dryer and providing three sets of heating components and one set of cooling components.

[0008] In addition, the utility model also achieves precise control of the heating or cooling temperature of the dryer by optimizing the structure of the heating component and the cooling component, and can complete the drying of the material in the shortest time, thereby improving the drying work efficiency and drying quality.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0011] The utility model provides a drying temperature control system, comprising a dryer, at least two sets of heating components, and a set of cooling components, wherein:

[0012] Each set of heating components has the same structure and is used to heat the heating plate in the dryer. Each set of heating components is independently provided with a first expansion tank and a first heat exchanger. The water inlet of the first expansion tank is connected to the water supply main pipe through a pipeline, and the water outlet is connected to the water inlet of the first heat exchanger through a pipeline and a hot water circulation pump. The steam inlet of the first heat exchanger is connected to the steam cylinder through a steam pipe, and the hot water outlet of the first heat exchanger is connected to the dryer through a circulating hot water inlet pipe.

[0013] The cooling component is used to cool the material at the discharge port of the dryer. The cooling component is provided with a second expansion tank and a second heat exchanger. The water inlet of the second expansion tank is connected to the water supply main through a pipeline, and its water outlet is connected to the water inlet of the second heat exchanger through a pipeline and a cooling water circulation pump. The chilled water inlet of the second heat exchanger is connected to the chilled water main through a pipeline, and the cooling water outlet of the second heat exchanger is connected to the dryer through a circulating cold water inlet pipe.

[0014] Furthermore, a first thermometer is provided on the circulating hot water inlet pipe; and a second thermometer is provided on the circulating cold water inlet pipe.

[0015] Furthermore, a first liquid level meter is provided above the first expansion tank, a first temperature transmitter is provided on the pipe at the water outlet of the first expansion tank, and a first pressure gauge is provided on the pipe between the hot water circulation pump and the water inlet of the first heat exchanger.

[0016] Furthermore, a second liquid level meter is provided above the second expansion tank, a second temperature transmitter is provided on the pipe at the water outlet of the second expansion tank, and a second pressure gauge is provided on the pipe between the cooling water circulation pump and the water inlet of the second heat exchanger.

[0017] Furthermore, a water inlet valve is separately provided on the pipeline connecting the water supply main pipe and the first expansion tank or the second expansion tank.

[0018] Furthermore, an overflow pipe is provided on the top of the first expansion tank, and an overflow valve is provided on the overflow pipe.

[0019] Furthermore, the second heat exchanger is also connected to the return water main through a pipeline, and a valve is provided on the pipeline.

[0020] Furthermore, the first heat exchanger is also connected through a steam trap valve group, a steam trap pipe and a condensate outlet pipe.

[0021] Furthermore, the dryer is provided with a circulating water outlet pipe, which is separately connected to the first expansion tank of the heating component and the second expansion tank of the cooling component.

[0022] Furthermore, the steam cylinder is connected to the low-pressure steam main pipe through a pipeline, and the low-pressure steam main pipe is also connected to the condensate main pipe through a steam trap group.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] (1) The utility model provides a drying temperature control system, which is equipped with three sets of heating components and one set of cooling components. Compared with the same type of drying equipment on the existing market, a single device has only one heating system and no cooling system. It has more advantages in hardware than similar products and significantly improves the drying capacity and drying efficiency.

[0026] (2) The utility model provides a drying temperature control system, which optimizes the structure of the heating component and the cooling component to make the heating temperature and the cooling temperature more accurately controlled, and can effectively ensure that the powdered material is continuously dried at a constant heating or cooling temperature, thereby significantly improving the drying effect of the material.

[0027] (3) The utility model provides a drying temperature control system, in which each set of heating components or cooling components is respectively provided with a temperature transmitter, a pressure gauge for detecting pressure, and a liquid level gauge, which can effectively control the deviation between the actual temperature of hot water or cold water and the set temperature within 2°C, thereby ensuring that the temperature control of the drying system is more accurate. In addition, the temperature transmitter, pressure gauge for detecting pressure, and liquid level gauge can also be electrically connected to the control system to realize automatic temperature control, which is beneficial to improving the degree of automation of material drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of a drying temperature control system of the utility model;

[0029] Figure 2 It is a structural schematic diagram of the heating component of the utility model;

[0030] Figure 3 It is a schematic structural diagram of the cooling assembly of the utility model.

[0031] In the figure:

[0032] 1. Heating assembly; 101. First expansion tank; 1011. First liquid level gauge; 102. First heat exchanger; 103. Overflow valve; 104. First thermometer; 105. Circulating hot water inlet pipe; 106. Steam drain pipe; 107. First pressure gauge; 108. First temperature transmitter; 109. Hot water circulation pump;

[0033] 2. Cooling assembly; 201. Second expansion tank; 2011. Second liquid level gauge; 202. Second heat exchanger; 203. Return water main; 204. Second thermometer; 205. Circulating cold water inlet pipe; 206. Valve; 207. Second pressure gauge; 208. Second temperature transmitter; 209. Cooling water circulation pump; 210. Chilled water main;

[0034] 3. Low-pressure steam main pipe; 4. Water supply main pipe; 401. Water inlet valve;

[0035] 5. Steam cylinder; 501. Steam pipe; 6. Steam trap group; 7. Condensate main pipe; 701. Condensate outlet pipe; 8. Dryer; 801. Circulating water outlet pipe. DETAILED DESCRIPTION

[0036] It should be noted that it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The utility model is further described below in conjunction with specific embodiments.

[0039] Example 1

[0040] like Figure 1As shown, a drying temperature control system of this embodiment includes a dryer 8, at least two sets of heating components 1, and a set of cooling components 2. Compared with the same type of drying equipment currently on the market, a single device has only one heating system and no cooling system, which is more advantageous than similar products in terms of hardware. In this embodiment, by providing multiple sets of heating components 1, the heating efficiency can be significantly improved, the heating cycle can be shortened, and the drying output can be guaranteed.

[0041] Specifically, Figure 2 As shown, in this embodiment, three sets of heating components 1 are specifically provided. The number of heating components 1 is determined according to actual conditions. In this embodiment, three sets of heating components 1 are used as an example for explanation. The structure of each set of heating components 1 is the same and is used to heat the heating plates in the dryer 8. In this embodiment, seven layers of heating plates are provided in the dryer 8. The first set of heating components 1 heats the six heating plates on the fifth layer, the six heating plates on the sixth layer, and the first three heating plates on the seventh layer of the dryer; the second set of heating components 1 heats the heating plates on the second layer, the third layer, and the fourth layer; the third set of heating components 1 heats the six heating plates on the first layer. The cooling system cools the last three cooling plates on the seventh layer.

[0042] Each set of heating components 1 is separately provided with a first expansion tank 101 and a first heat exchanger 102. The water inlet of the first expansion tank 101 is connected to the water supply main pipe 4 through a pipeline. The pipeline is provided with a water inlet valve 401 for controlling the amount of pure water entering the first expansion tank 101. The water outlet of the first expansion tank 101 is connected to the water inlet of the first heat exchanger 102 through a pipeline and a hot water circulation pump 109.

[0043] More optimally, in order to achieve accurate control of the water temperature of the heating component 1, first, a first liquid level meter 1011 is provided above the first expansion tank 101, which can detect the liquid level in the first expansion tank 101 in real time. When it is detected that the liquid level in the first expansion tank 101 is too high, the pure water replenishment can be stopped by controlling the closing of the water inlet valve 401. A first temperature transmitter 108 is provided on the pipeline at the water outlet of the first expansion tank 101, which can detect the temperature of the liquid entering the hot water circulation pump 109 in real time, and a first pressure gauge 107 is provided on the pipeline between the hot water circulation pump 109 and the water inlet of the first heat exchanger 102, which can detect the water pressure and flow of the hot water circulation pump 109 in real time to control the amount of pure water entering the first heat exchanger 102.

[0044] The steam inlet of the first heat exchanger 102 is connected to the steam cylinder 5 through the steam pipe 501, which is used to exchange heat with the pure water entering the first heat exchanger 102, so that the hot water in the first heat exchanger 102 reaches the set temperature and is transported from the outlet of the first heat exchanger 102 through the circulating hot water inlet pipe 105 to the dryer 8 to heat the heating plate. In order to better control and adjust the temperature of the hot water entering the dryer 8, a first thermometer 104 is provided on the circulating hot water inlet pipe 105 at the outlet of the first heat exchanger 102. When the water temperature of the circulating hot water inlet pipe 105 is too high or too low, the water temperature can be adjusted by adjusting the steam flow rate entering the first heat exchanger 102, thereby realizing temperature detection and feedback control of the hot water outlet of the first heat exchanger 102.

[0045] The three sets of heating components 1 provided in this embodiment have the same structure and are independently provided. Each set of heating components 1 is provided in parallel to heat different heating plates in the dryer 8. At the same time, the various valves, pressure gauges, thermometers and liquid level gauges provided on the above pipelines can be connected to the existing control system to realize automatic feedback adjustment, thereby improving the degree of automatic operation of material heating and drying.

[0046] like Figure 3 As shown, the cooling assembly 2 is provided with a set, which is used to cool the material at the discharge port of the dryer 8. The cooling assembly 2 is provided with a second expansion tank 201 and a second heat exchanger 202. The water inlet of the second expansion tank 201 is connected to the water supply main pipe 4 through a pipeline. The pipeline is provided with a water inlet valve 401 for controlling the amount of pure water entering the second expansion tank 201. The water outlet of the second expansion tank 201 is connected to the water inlet of the second heat exchanger 202 through a pipeline and a cooling water circulation pump 209.

[0047] Similarly, in order to ensure accurate control of the water temperature of the cooling component 2, similar to the heating component 1, a second liquid level gauge 2011 is provided above the second expansion tank 201 provided in the cooling component 2, which can detect the liquid level in the second expansion tank 201 in real time. When it is detected that the liquid level in the second expansion tank 201 is too high, the pure water replenishment can be stopped by controlling the closing of the water inlet valve 401. A second temperature transmitter 208 is provided on the pipeline at the water outlet of the second expansion tank 201, which can detect the temperature of the liquid entering the cooling water circulation pump 209 in real time, and a second pressure gauge 207 is provided on the pipeline between the cooling water circulation pump 209 and the water inlet of the second heat exchanger 202, which can detect the water pressure and flow of the cooling water circulation pump 209 in real time to control the amount of pure water entering the second heat exchanger 202.

[0048] The chilled water inlet of the second heat exchanger 202 is connected to the chilled water main pipe 210 through a pipeline, and is used to perform heat exchange on the pure water entering the second heat exchanger 202, so that the chilled water in the second heat exchanger 202 reaches the set temperature, and is transported from the outlet of the second heat exchanger 202 through the circulating cold water inlet pipe 205 to the dryer 8 to cool the heating plate. In order to better control and adjust the temperature of the cold water entering the dryer 8, a second thermometer 204 is provided on the circulating cold water inlet pipe 205 at the outlet of the second heat exchanger 202. When it is detected that the temperature of the cooling water in the circulating cold water inlet pipe 205 is too high or too low, the flow rate of the chilled water entering the second heat exchanger 202 from the chilled water main pipe 210 can be controlled by adjusting the valve 206, and the water temperature can be adjusted, thereby realizing the temperature detection and feedback control of the cold water outlet of the second heat exchanger 202.

[0049] In addition, the second heat exchanger 202 is also connected to the return water main pipe 203 through a pipeline, and a valve is provided on the pipeline. When the second heat exchanger 202 is overfilled with chilled water, it can flow back to the return water main pipe 203 through the pipeline for recovery.

[0050] In addition, the circulating water outlet pipe 801 provided on the dryer 8 corresponding to the cooling component 2 is connected to the second expansion tank 201 of the cooling component 2, and the cooled pure water can be returned to the second expansion tank 201 for recycling. The second liquid level gauge 2011 provided on the top of the cooling component 2 has the same design as the heating component 1 and also adopts a tuning fork liquid level switch. When the liquid level in the second expansion tank 201 is detected to be at a high level, the water inlet valve 401 will be automatically closed to stop the pure water replenishment.

[0051] In addition, it is worth mentioning that the heating water source in the water replenishment main pipe 4 in this embodiment is filtered using tap water, and the conductivity of the prepared deionized water (i.e., pure water) is ≤10μS / cm. After the pipeline is pickled and passivated with pure water, there are no microorganisms or rust in the pipeline, which reduces the risk of pipeline blockage.

[0052] In addition, the first heat exchanger 102 is also connected to the condensate outlet pipe 701 through the steam trap valve group 6, the steam trap pipe 106, and the condensate outlet pipe 701 is connected to the condensate main pipe 7 to discharge excess steam for recycling. In addition, an overflow pipe is also provided on the top of the first expansion tank 101, and an overflow valve 103 is provided on the overflow pipe, and the overflow pipe is also connected to the condensate main pipe 7.

[0053] The basic process of heating using the heating assembly 1 of this embodiment is as follows:

[0054] The water supply main pipe 4 is connected to the first expansion tank 101 of each set of heating components 1 through a separately arranged sub-pipeline. After the pure water enters the first expansion tank 101, it is pumped into the first heat exchanger 102 through the hot water circulation pump 109. The steam pipe 501 transports the steam from the corresponding steam cylinder 5 to the first heat exchanger 102. The steam heats the pure water, and then it is transported from the outlet of the first heat exchanger 102 through the circulating hot water inlet pipe 105 to the dryer 8 to heat the heating plate. At the same time, the excess steam is discharged from the steam drain pipe 106 of the first heat exchanger 102. After the heated pure water heats the heating plate, it flows back to the first expansion tank 101 of the corresponding heating component 1 through the circulating water outlet pipe 801 for recycling. During the process of continuous pure water replenishment, the first liquid level gauge 1011 arranged above the first expansion tank 101 adopts a tuning fork liquid level switch. When it is detected that the liquid level of the first expansion tank 101 is at a high level, on the one hand, the water inlet valve 401 will be automatically closed to stop the pure water replenishment; on the other hand, the excess pure water can overflow through the overflow pipe arranged above the first expansion tank 101.

[0055] The basic process of cooling using the cooling assembly 2 of this embodiment is as follows:

[0056] The water supply main pipe 4 is connected to the second expansion tank 201 of the cooling assembly 2 through a separately arranged sub-pipeline. After the pure water enters the second expansion tank 201, it is pumped into the second heat exchanger 202 through the cooling water circulation pump 209. The chilled water main pipe 210 transports the chilled water to the second heat exchanger 202. The chilled water cools the pure water that has entered, and then is transported from the outlet of the second heat exchanger 202 through the circulating cold water inlet pipe 205 to the dryer 8 to cool the heating plate. At the same time, the excess chilled water is discharged from the return pipe of the second heat exchanger 202 to the return water main pipe 203 for storage. After the cooled circulating cold water cools the heating plate, it flows back to the second expansion tank 201 of the corresponding cooling assembly 2 through the circulating water outlet pipe 801 for recycling. During the process of continuous pure water replenishment, the second liquid level meter 2011 arranged above the second expansion tank 201 adopts a tuning fork liquid level switch. When it detects that the liquid level of the second expansion tank 201 is at a high level, it will automatically close the water inlet valve 401 to stop the pure water replenishment.

[0057] Therefore, in this embodiment, by using multiple sets of heating components 1 to control the heating plates in the dryer 8, the heating efficiency is higher, and the drying amount and drying efficiency of the powdered raw materials can be effectively improved. At the same time, in this embodiment, by setting a set of cooling components 2, the material after heating and drying can be cooled to a suitable temperature for discharging, and finally a qualified material product is obtained. The drying temperature control system of the utility model is adopted, and the structure of the heating component and the cooling component are optimized and designed, so that the heating temperature and the cooling temperature are controlled more accurately, which can effectively ensure that the powdered material is continuously dried at a constant heating or cooling temperature, and the drying effect of the material is significantly improved.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drying temperature control system, comprising a drying device (8), characterized in that: It also includes at least two sets of heating components (1) and one set of cooling components (2), wherein: Each set of heating components (1) has the same structure and is used to heat the heating plate in the dryer (8). Each set of heating components (1) is independently provided with a first expansion tank (101) and a first heat exchanger (102). The water inlet of the first expansion tank (101) is connected to the water supply main pipe (4) through a pipeline, and the water outlet is connected to the water inlet of the first heat exchanger (102) through a pipeline and a hot water circulation pump (109). The steam inlet of the first heat exchanger (102) is connected to the steam cylinder (5) through a steam pipe (501), and the hot water outlet of the first heat exchanger (102) is connected to the dryer (8) through a circulating hot water inlet pipe (105); The cooling component (2) is used to cool the material at the discharge port of the dryer (8). The cooling component (2) is provided with a second expansion tank (201) and a second heat exchanger (202). The water inlet of the second expansion tank (201) is connected to the water supply main pipe (4) through a pipeline, and the water outlet is connected to the water inlet of the second heat exchanger (202) through a pipeline and a cooling water circulation pump (209). The chilled water inlet of the second heat exchanger (202) is connected to the chilled water main pipe (210) through a pipeline, and the cooling water outlet of the second heat exchanger (202) is connected to the dryer (8) through a circulating cold water inlet pipe (205).

2. The drying temperature control system according to claim 1, characterized in that: The circulating hot water inlet pipe (105) is provided with a first thermometer (104); the circulating cold water inlet pipe (205) is provided with a second thermometer (204).

3. The drying temperature control system according to claim 1, characterized in that: A first liquid level meter (1011) is provided above the first expansion tank (101), a first temperature transmitter (108) is provided on the pipeline at the water outlet of the first expansion tank (101), and a first pressure gauge (107) is provided on the pipeline between the hot water circulation pump (109) and the water inlet of the first heat exchanger (102).

4. The drying temperature control system according to claim 1, characterized in that: A second liquid level meter (2011) is provided above the second expansion tank (201), a second temperature transmitter (208) is provided on the pipeline at the water outlet of the second expansion tank (201), and a second pressure gauge (207) is provided on the pipeline between the cooling water circulation pump (209) and the water inlet of the second heat exchanger (202).

5. The drying temperature control system according to any one of claims 1 to 4, characterized in that: A water inlet valve (401) is separately provided on the pipeline connecting the water replenishment main pipe (4) and the first expansion tank (101) or the second expansion tank (201).

6. The drying temperature control system according to any one of claims 1 to 4, characterized in that: An overflow pipe is also provided at the top of the first expansion tank (101), and an overflow valve (103) is provided on the overflow pipe.

7. The drying temperature control system according to any one of claims 1 to 4, characterized in that: The second heat exchanger (202) is also connected to the return water main (203) via a pipeline, and a valve is provided on the pipeline.

8. The drying temperature control system according to any one of claims 1 to 4, characterized in that: The first heat exchanger (102) is also connected via a steam trap valve group (6), a steam trap pipe (106) and a condensate outlet pipe (701).

9. The drying temperature control system according to any one of claims 1 to 4, characterized in that: The dryer (8) is provided with a circulating water outlet pipe (801), and the circulating water outlet pipe (801) is independently connected to the first expansion tank (101) of the heating component (1) and the second expansion tank (201) of the cooling component (2).

10. The drying temperature control system according to any one of claims 1 to 4, characterized in that: The steam cylinder (5) is connected to the low-pressure steam main pipe (3) through a pipeline, and the low-pressure steam main pipe (3) is also connected to the condensate main pipe (7) through a steam trap group (6).

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