A pseudo-boehmite decomposition temperature control device

Abstract

The utility model discloses a kind of pseudo-boehmite decomposition temperature control devices, including decomposition tank, 50mm diameter stainless steel coil pipe wound on the upper and lower inner wall of decomposition tank, frequency conversion water pump connected with coil pipe water inlet end, flowmeter arranged at water pump outlet and thermometer located at coil pipe water outlet, wherein stainless steel coil pipe is connected to form the circulating waterway of total length 60m by elbow, frequency conversion water pump is connected with coil pipe to constitute closed loop system by DN100mm stainless steel pipe, and interlock control device is equipped with carbon dioxide ventilation electric valve of decomposition tank and water pump start-stop interlock.The device enhances heat exchange efficiency through large surface area coil pipe structure, combined with frequency conversion water pump flow regulation and multi-point temperature monitoring to realize decomposition temperature accurate control, interlock mechanism ensures that cooling operation and decomposition process are automatically synchronized, effectively prevent hetero-phase generation, with the advantages of compact structure, temperature control sensitivity and high degree of automation.

Description

Technical Field

[0001] This utility model patent belongs to the field of carbonization method for preparing pseudoboehmite, specifically relating to a device for controlling the decomposition temperature of pseudoboehmite. Background Technology

[0002] The decomposition process of pseudoboehmite using the carbonation method is an exothermic reaction. Decomposition at lower temperatures is essential for its formation, while higher temperatures can easily lead to the formation of impurity phases and reduced colloidal properties. Currently, dry ice is commonly used as a precipitant in the carbonation process for pseudoboehmite, resulting in a relatively slow temperature rise and a relatively low final temperature. Another method uses CO2 tail gas from a lime furnace as a precipitant, but this results in a relatively high temperature. While using a cooler water source as the hot water exchanger for the sodium aluminate solution can forcibly lower the initial decomposition temperature, this method is difficult to control, costly, and causes fluctuations in the final decomposition temperature, affecting product quality stability. Therefore, it is necessary to cool the decomposition process to ensure a controllable final decomposition temperature. Utility Model Content

[0003] The purpose of this invention is to provide a pseudo-boehmite decomposition temperature control device to solve the problems mentioned in the background art.

[0004] The technical solution of this utility model to achieve the above objectives is as follows:

[0005] A pseudo-boehmite decomposition temperature control device, characterized in that it comprises: a decomposition tank; stainless steel coils (11, 12, 13) disposed inside the decomposition tank, the stainless steel coils being wound up and down along the tank wall and adjacent pipes being connected by elbows; a variable frequency water pump (3) connected to the water inlet end of the stainless steel coils, the variable frequency water pump (3) being provided with a water pump inlet pipe (1) and a water pump outlet pipe (4), the stainless steel coils being connected to a main outlet steel pipe (17) through their respective outlet pipes; a flow meter (6) disposed on the outlet pipe of the variable frequency water pump; thermometers (14, 15, 16) disposed on the respective outlet pipes of the stainless steel coils; wherein, the total unfolded length of the stainless steel coils is 60m and the vertical winding height is 2m; and also includes an interlocking control device, the interlocking control device forming a start-stop interlocking mechanism between the carbon dioxide venting electric valve of the decomposition tank and the variable frequency water pump (3) through an electrical connection.

[0006] According to the above-mentioned pseudo-boehmite decomposition temperature control device, the characteristic is that: the pipe diameter of the stainless steel coil (11, 12, 13) is 50mm, and the elbow connection spacing of adjacent pipes is arranged perpendicular to the height direction of the decomposition tank.

[0007] The aforementioned pseudo-boehmite decomposition temperature control device is characterized in that: the rated flow rate of the variable frequency water pump (3) is 100 m³ / s. 3 / h, with a head of 40m, and its outlet pipe (4) is made of stainless steel with a diameter of 100mm.

[0008] According to the above-mentioned pseudo-boehmite decomposition temperature control device, the feature is that: a gate valve (5) is provided between the flow meter (6) and the variable frequency water pump (3), the gate valve adopts the DN100mm specification and is coaxially installed with the water pump outlet pipe (4).

[0009] The technical advantages of this invention are: the device enhances heat exchange efficiency through a large surface area coil structure, achieves precise control of decomposition temperature by combining variable frequency water pump flow regulation and multi-point temperature monitoring, and the interlocking mechanism ensures automatic synchronization between cooling operation and decomposition process, effectively preventing the generation of impurity phases. It has the advantages of compact structure, high temperature control sensitivity and high degree of automation. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention;

[0011] Figure 2 This is a front view of the cooling coil;

[0012] Figure 3 This is a top view of the cooling coil;

[0013] Figure 4 This is a diagram showing the unfolded shape of the cooling coil. Detailed Implementation

[0014] The structure of this utility model will now be further described with reference to the accompanying drawings.

[0015] The pseudo-boehmite decomposition temperature control device of this utility model mainly consists of a decomposition tank, a stainless steel coil, a variable frequency water pump, a flow meter, and a thermometer. Figure 1 As shown, three sets of stainless steel coils 11, 12, and 13 are vertically wound around the inner wall of the decomposition tank (φ1.5×10m). Each set of coils has a pipe diameter of 50mm. Adjacent pipes are connected by elbows to form a continuous water path. The total height of the coils is 2m, and the total unfolded length is 60m. A variable frequency water pump 3 is connected to the inlet of the coils via a 100mm diameter stainless steel pipe 4, with a rated flow rate of 100m³ / h. 3With a flow rate of 40m and a head of 1000m, the circulating water flow rate can be flexibly controlled by adjusting the frequency. A DN100mm gate valve 5 and a flow meter 6 are installed sequentially on the pump outlet pipe. The gate valve 5 is coaxially mounted with the pump outlet pipe 4 for emergency shut-off or maintenance. The flow meter 6 monitors the circulating water flow rate in real time, providing data support for frequency conversion regulation. Thermometers 14, 15, and 16 are installed at the outlets of each coil 11, 12, and 13 to accurately monitor the outlet water temperature and provide feedback to the control system. Furthermore, the interlocking control device links the carbon dioxide venting electric valve of the decomposition tank with the frequency conversion pump 3 via electrical signals, enabling the pump to automatically start when decomposition begins and automatically stop when decomposition ends, ensuring synchronization between the cooling process and the reaction process.

[0016] All measuring points installed in the cooling water inlet and outlet pipes of this invention are connected to the DCS control system, enabling real-time monitoring of the cooling water pipes. When mechanical seal leakage occurs, timely action is taken to protect the normal operation of the pump. Flow meters are installed in the cooling water inlet and outlet pipes, and a pH meter is installed in the outlet pipe. When the flow difference increases or the pH value is abnormal, it can be determined whether the mechanical seal is leaking, thereby improving the service life of the pump and ensuring normal production operation.

[0017] The operation method of this device is as follows: First, adjust the inlet gate valve 2, outlet gate valve 5, and branch gate valves 8, 9, and 10 to the fully open state, and then start the variable frequency water pump 3. During the decomposition process, the sodium aluminate solution reacts with carbon dioxide, releasing heat and causing the slurry temperature to rise. At this time, the circulating water flow rate is monitored by the flow meter 6, and the water pump frequency is dynamically adjusted according to the readings of the outlet thermometers 14, 15, and 16. For example, when the slurry temperature rises rapidly, the water pump frequency is increased to increase the water flow rate and enhance the heat exchange between the coil and the slurry; conversely, the frequency is decreased to reduce energy consumption. The interlock device automatically starts the water pump after the decomposition electric valve is opened and automatically stops it after the reaction is completed, avoiding delays caused by manual operation.

[0018] Example 1

[0019] A sodium aluminate solution at 33-34℃ is introduced into the decomposition tank at a feed level of 3.5m. After the sodium aluminate solution is fed, the carbon dioxide venting electric valves of the three decomposition tanks are opened without turning on the water pump. The decomposition endpoint temperature is 47-48℃. Then, the water pump is turned on at a frequency of 45Hz and a water temperature of 30℃. After the decomposition is completed, the water pump is stopped. The decomposition endpoint temperature is 41-42℃.

[0020] Example 2

[0021] A sodium aluminate solution at 35-36℃ is introduced into the decomposition tank at a feed level of 3.5m. After the sodium aluminate solution is fed, the carbon dioxide venting electric valves of the three decomposition tanks are opened without turning on the water pump. The decomposition endpoint temperature is 48-49℃. Then, the water pump is turned on at a frequency of 35Hz and a water temperature of 24℃. After the decomposition is completed, the water pump is stopped. The decomposition endpoint temperature is 41-42℃.

[0022] This device controls the cooling effect in real time and precisely by adjusting the frequency of the variable frequency water pump. It is easy to operate, has stable control, and is suitable for industrial application.

Claims

1. A device for controlling the decomposition temperature of boehmite, characterized in that, include: Decomposition tank; Stainless steel coils (11, 12, 13) are installed inside the decomposition tank. The stainless steel coils are arranged to be wound up and down along the tank wall and adjacent pipes are connected by elbows. A variable frequency water pump (3) is connected to the water inlet of the stainless steel coils. The variable frequency water pump (3) is provided with a water pump inlet pipe (1) and a water pump outlet pipe (4). The stainless steel coils are connected to the main outlet steel pipe (17) through their respective outlet pipes. A flow meter (6) is installed on the outlet pipe of the variable frequency water pump. A thermometer (14, 15, 16) is installed on the outlet pipe of each stainless steel coil. The total unfolded length of the stainless steel coils is 60m and the height of the winding is 2m. The system also includes an interlocking control device, which connects the carbon dioxide venting electric valve of the decomposition tank with the variable frequency water pump (3) through an electrical connection to form a start-stop interlocking mechanism.

2. The pseudo-boehmite decomposition temperature control device according to claim 1, characterized by: The stainless steel coils (11, 12, 13) have a pipe diameter of 50mm, and the elbow connection spacing between adjacent pipes is arranged perpendicular to the height direction of the decomposition tank.

3. The pseudo-boehmite decomposition temperature control device according to claim 1, characterized by: The variable frequency water pump (3) has a rated flow rate of 100 m³ / h and a head of 40 m. Its water pump outlet pipe (4) is made of stainless steel with a diameter of 100 mm.

4. The pseudo-boehmite decomposition temperature control device according to claim 1, characterized by: A gate valve (5) is provided between the flow meter (6) and the variable frequency water pump (3). The gate valve adopts a DN100mm specification and is installed coaxially with the water pump outlet pipe (4).

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