Automatic control equipment of drying machine

Abstract

The utility model relates to the technical field of discharging control of a drying machine, in particular to automatic control equipment of the drying machine. According to the technical scheme, the device comprises at least one mass detector which is arranged at the bottom of a drying machine tank body and is used for measuring the net weight of materials in the drying machine tank body; the feeding unit comprises a feeding pipeline formed by connecting a feeding pipe and a first connecting hose, one end of the feeding pipe is connected with the drying machine tank body, the feeding pipe is connected with an MVR evaporator and used for conveying viscous liquid of pre-concentrated liquid to the drying machine tank body, and a feeding flowmeter is installed at the feeding end of the feeding pipe; and the steam unit comprises a secondary steam pipeline formed by connecting a steam pipe and a second connecting hose. According to the utility model, the operation of the machine is controlled by utilizing the concentration ratio of materials and steam before and after the drying machine, so that the operations such as automatic discharge are realized, and the problem that the drying machine cannot realize automatic discharge control due to the fact that the actual liquid level cannot be detected under the condition that a viscous object is irregular at present is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of material discharging control for a drying machine, in particular to automatic control equipment for a drying machine. Background Art

[0002] Mechanical steam recompression treatment technology has gradually begun to be applied to domestic industrial wastewater evaporation treatment projects. It usually uses a steam compressor to recompress and heat the secondary steam generated by the evaporator, making the secondary steam a regenerative heat source and circulating it to continuously evaporate the original liquid in the evaporator to reduce the water content of the original liquid.

[0003] At present, when using a dryer to dry the viscous liquid of the pre-concentrated liquid, the dryer tank is filled with water vapor, and the internal material is liquid at the beginning and solid or high-viscosity, high-density viscous object at the later stage. At present, there is no sensor that can sense the material level, especially when the viscous object is irregular, its actual level cannot be detected, resulting in the dryer being unable to achieve automatic control, and can only rely on manual observation of the internal material state through the sight glass to manually discharge or other operations. Therefore, the utility model provides a dryer automatic control device for solving the above problems. Utility Model Content

[0004] The purpose of the utility model is to propose an automatic control device for a dryer to address the problem in the background technology that there is currently no sensor that can sense the material level, especially when the viscous object is irregular, its actual level cannot be detected, resulting in the dryer being unable to automatically control the discharge of the material.

[0005] The utility model proposes an automatic control device for a dryer, comprising a dryer tank body and a heating layer arranged on the outer wall of the dryer tank body, wherein a heat-conducting medium is passed through the heating layer for heat transfer, the dryer tank body is connected to an MVR evaporator, and further comprising:

[0006] At least one mass detector installed at the bottom of the dryer tank to measure the net weight of the material in the dryer tank;

[0007] A feeding unit, comprising a feeding pipeline formed by connecting a feeding pipe and a first connecting hose, one end of the feeding pipe is connected to the dryer tank, the feeding pipe is connected to the MVR evaporator, and is used to transport the viscous liquid of the pre-concentrated liquid to the dryer tank, and a feeding flowmeter is installed at the feeding end of the feeding pipe to measure the feeding amount of the viscous liquid;

[0008] The steam unit includes a secondary steam pipeline formed by connecting a steam pipe and a second connecting hose. The steam pipe is connected to the outlet pipeline of the compressor on the MVR evaporator and is used to transport the secondary steam on the dryer tank to the MVR evaporator. A steam flow meter is installed on the steam pipe to measure the accumulated evaporation amount, and the concentration ratio of the dryer tank is used to control automatic discharge.

[0009] Optionally, one side of the dryer tank body is connected to a reduction motor via a shaft seal, and a discharge port is provided on the other side of the dryer tank body, and a discharge switch is installed on the discharge port.

[0010] Optionally, one end of the steam pipe is connected to the dryer tank through a defoaming device.

[0011] Optionally, the heat-conducting medium is heated by an electric heater, and the heat-conducting medium is circulated by a circulation pump.

[0012] Optionally, the quality detector is electrically connected to a sensing switch.

[0013] Optionally, a main control module is further included, the input end of the main control module is electrically connected to the quality detector, and the output end of the main control module is electrically connected to a feed flow meter, a steam flow meter, a discharge switch, and a sensing switch, respectively.

[0014] Optionally, the first connecting hose and the second connecting hose are respectively installed horizontally using hoses of 500-800 mm.

[0015] Optionally, the concentration ratio is expressed as:

[0016]

[0017] Among them, C 32 Indicates the cumulative feed volume of the viscous liquid measured by the feed flow meter; C 15 It indicates the net weight of the material in the dryer tank after drying measured by the mass detector.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] 1. The high evaporation efficiency of the MVR evaporator and the advantage of the dryer in drying viscous liquids are organically combined to enable industrial wastewater to evaporate and dry quickly. The MVR evaporator is equipped with a circulation pump, which allows the original liquid to continuously circulate and evaporate in the evaporator to form a concentrated liquid with a higher concentration. The concentrated liquid is dried in the dryer, which not only improves the evaporation efficiency but also solves the scaling of the material;

[0020] 2. The utility model utilizes the concentration ratio of materials and steam before and after the dryer to control the operation of the machine and realize automatic discharging and other operations, solving the problem that the actual liquid level of the current viscous object cannot be detected when it is irregular, resulting in the dryer being unable to realize automatic control of discharging. It has the advantages of high degree of automation, stable drying performance, higher drying efficiency, low energy consumption, etc., and greatly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0022] Figure 2 This is a principle block diagram of the utility model.

[0023] Reference numerals:

[0024] 1. Dryer tank; 11. Heating layer; 12. Shaft seal; 13. Speed ​​reducer motor; 14. Discharge port; 15. Quality detector;

[0025] 141, discharge switch; 151, sensing switch;

[0026] 2. Defoaming device;

[0027] 3. Feed pipe; 31. First connecting hose; 32. Feed flow meter;

[0028] 4. Steam pipe; 41. Second connecting hose; 42. Steam flow meter. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Example

[0031] like Figure 1 , Figure 2As shown, the utility model proposes an automatic control device for a dryer, comprising a dryer tank body 1 and a heating layer 11 arranged on the outer wall of the dryer tank body 1. A heat-conducting medium is passed through the heating layer 11 for heat transfer. The heat-conducting medium is heated by an electric heater and circulated by a circulating pump. The internal temperature of the automatic control device for the dryer is controllable, and the heating layer 11 can be used to preheat the material in the dryer tank body 1, thereby improving the concentration ratio of the evaporation concentration device. The use of heat-conducting oil to heat the dryer makes the dryer not a high-pressure container and the management is fully automated. The dryer can play a dual role, not only meeting the steam demand of the dryer itself, but also supplementing the steam required by the MVR evaporator. When starting, the MVR evaporator needs steam, and the steam currently needs to be introduced with the help of external boilers and other equipment. The utility model can directly introduce the evaporation of the dryer into the MVR evaporator, which greatly saves energy. During the operation of the MVR evaporator, since the steam will be lost, the steam of the dryer can play a good supplement. During the normal operation of the MVR evaporator, the steam of the dryer is introduced into the MVR evaporator, which can increase the evaporation amount, accelerate the evaporation of the liquid, and greatly save energy.

[0032] The dryer tank 1 and the MVR evaporator are connected in a circulation manner by a feed unit and a steam unit. The MVR evaporator adopts a horizontal tube falling film evaporator or a vertical tube falling film evaporator or a forced circulation evaporator, and the forced circulation evaporator adopts a shell and tube heat exchanger or a plate heat exchanger.

[0033] In this embodiment, the automatic control equipment of the dryer includes at least one mass detector 15. If the amount of viscous liquid pre-concentrated in a single time is large or the volume of the dryer tank 1 is large, four groups of mass detectors can be symmetrically arranged at the bottom of the dryer tank 1 to measure the net weight of the material in the dryer tank 1.

[0034] Among them, the feeding unit of the dryer automatic control equipment includes a feeding pipeline formed by connecting a feeding pipe 3 and a first connecting hose 31, one end of the feeding pipe 3 is connected to the dryer tank body 1, and the feeding pipe 3 is connected to the MVR evaporator, which is used to transport the viscous liquid of the pre-concentrated liquid to the dryer tank body 1. The feeding pipe 3 is installed with a feeding flowmeter 32 at the feeding end to measure the feeding amount of the viscous liquid.

[0035] Furthermore, the steam unit of the dryer automatic control equipment includes a secondary steam pipeline formed by connecting a steam pipe 4 and a second connecting hose 41. The steam pipe 4 is connected to the outlet pipeline of the compressor on the MVR evaporator, and is used to transport the secondary steam on the dryer tank 1 to the MVR evaporator. A steam flow meter 42 is installed on the steam pipe 4 to measure the accumulated evaporation amount, and the concentration ratio of the dryer tank 1 is used to control the automatic discharge.

[0036] Specifically, the concentration ratio is expressed as:

[0037]

[0038] Among them, C 32 Indicates the cumulative feed volume of the viscous liquid measured by the feed flow meter; C 15 It indicates the net weight of the material in the dryer tank after drying measured by the mass detector.

[0039] Furthermore, the automatic control equipment of the dryer also includes a main control module, the input end of the main control module is electrically connected to the quality detector 15, and the output end of the main control module is electrically connected to the feed flow meter 32, the steam flow meter 42, the discharge switch 141, and the sensing switch 151 respectively. One end of the steam pipe 4 is connected to the dryer tank body 1 through the defoaming device 2, and one side of the dryer tank body 1 is connected to the reduction motor 13 through the shaft seal 12. The current limiting control of the reduction motor 13 prevents the tube sheet from overloading. A discharge port 14 is set on the other side of the dryer tank body 1, and a discharge switch 141 is installed on the discharge port 14. The quality detector 15 is electrically connected to the sensing switch 151, wherein the discharge switch 141 and the sensing switch 151 can be controlled by a button, or can be electrically connected to the main control module through a line to realize automatic control of the switch.

[0040] Preferably, the first connecting hose 31 and the second connecting hose 41 are respectively installed horizontally using hoses of 500-800 mm. The steam flow meter 42 is installed in a straight pipe section that is 5 times the diameter of the pipe at the front and 3 times the diameter of the pipe at the rear.

[0041] In this embodiment, the specific implementation method of the automatic control method of the drying machine is as follows:

[0042] Step 1: The viscous liquid of the pre-concentrated liquid is transported to the dryer tank 1 through the feeding unit. Before transportation, the feed flow meter 32 is used to measure the feed amount of the viscous liquid, the data is sent to the main control module, and the cumulative feed amount is measured;

[0043] Step 2: During the drying process of the dryer tank 1, the mass detector 15 detects the net weight of the material in the dryer tank 1 in real time. At the same time, the secondary steam generated during the drying of the dryer tank 1 is transported to the MVR evaporator. The steam flow rate of the secondary steam is measured by the steam flow meter 42 before each transportation, and the detection signal is sent to the main control module to measure the cumulative evaporation amount.

[0044] Step 3: Using the accumulated feed amount / current net weight of the material in the dryer tank 1 as the current concentration ratio, when the concentration ratio reaches the preset value, the main control module controls the dryer tank 1 to stop working, the program predicts the discharge time in advance, prompts the material to be received, the sensing switch detects the material receiving device or the material receiving vehicle, and sends the sensing signal to the main control module. After receiving the signal, the main control module executes the discharge program and controls the discharge switch 141 to open, realizing automatic discharge. The operator can pause / continue the discharge with a button;

[0045] Step 4: After the discharge time is over, a prompt is given and the discharge switch 141 is closed, that is, the discharge valve is closed;

[0046] Step 5: When the quality detector 15 detects that the weight of the material in the current drying machine tank 1 is lower than a preset value, the detection signal is sent to the main control module, and the main control module controls the feeding unit to continue to convey the viscous liquid of the pre-concentrated liquid.

[0047] Among them, during the discharge process, if the material receiving device or the trolley is full but the discharge program is not completed, the discharge switch 141 is controlled to be closed, and the dryer is in a pause stage until the next material receiving device or the trolley reaches the material receiving position, and the discharge operation continues until the current discharge program is completed.

[0048] The above-mentioned specific embodiments are only several optional embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A dryer automatic control device, comprising a dryer tank and a heating layer arranged on the outer wall of the dryer tank, wherein a heat-conducting medium is passed through the heating layer for heat transfer, and the dryer tank is connected to an MVR evaporator, characterized in that: Also includes: At least one mass detector installed at the bottom of the dryer tank to measure the net weight of the material in the dryer tank; A feeding unit, comprising a feeding pipeline formed by connecting a feeding pipe and a first connecting hose, one end of the feeding pipe is connected to the dryer tank, the feeding pipe is connected to the MVR evaporator, and is used to transport the viscous liquid of the pre-concentrated liquid to the dryer tank, and a feeding flowmeter is installed at the feeding end of the feeding pipe to measure the feeding amount of the viscous liquid; The steam unit includes a secondary steam pipeline formed by connecting a steam pipe and a second connecting hose. The steam pipe is connected to the outlet pipeline of the compressor on the MVR evaporator and is used to transport the secondary steam on the dryer tank to the MVR evaporator. A steam flow meter is installed on the steam pipe to measure the accumulated evaporation amount, and the concentration ratio of the dryer tank is used to control automatic discharge.

2. The automatic control device for a drying machine according to claim 1, characterized in that: One side of the dryer tank body is connected to the reduction motor through a shaft seal, and the other side of the dryer tank body is provided with a discharge port, and a discharge switch is installed on the discharge port.

3. The automatic control device for a drying machine according to claim 1, characterized in that: One end of the steam pipe is connected to the drying machine tank through a defoaming device.

4. The automatic control device for a drying machine according to claim 1, characterized in that: The heat-conducting medium is heated by an electric heater and circulated by a circulating pump.

5. The automatic control device for a drying machine according to claim 2, characterized in that: The quality detector is electrically connected to the sensing switch.

6. The automatic control device for a drying machine according to claim 5, characterized in that: It also includes a main control module, the input end of the main control module is electrically connected to the quality detector, and the output end of the main control module is electrically connected to a feed flow meter, a steam flow meter, a discharge switch, and a sensing switch, respectively.

7. The automatic control device for a drying machine according to claim 1, characterized in that: The first connecting hose and the second connecting hose are respectively installed horizontally using hoses of 500-800 mm.

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