Adjusting method for controlling moisture of spray granulation powder and related equipment

Abstract

The invention discloses an adjusting method and system for controlling the moisture of spray granulation powder, and the method comprises the steps: operating a spray drying chamber by controlling the inlet temperature, outlet temperature, indoor negative pressure, plunger pump slurry pressure and natural gas pressure flow of the high-temperature drying chamber; the powder moisture value measured by the common moisture meter and the powder moisture value measured by the infrared moisture meter are compared with the process range requirement, the powder moisture value measured by the common moisture meter is used as a reference value, and the natural gas flow, the temperature and the plunger pump pressure are automatically adjusted through real-time monitoring of the online infrared moisture meter in combination with the industrial personal computer; the dynamic closed-loop control of moisture is realized, the problem of manual detection lag is solved, the difference between the reference value and the moisture dynamic closed-loop control is reduced by adjusting a plurality of parameters, the deviation between the reference value and the infrared measurement value is corrected by adjusting the translation amount, and the moisture measurement coincidence rate of the powder is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of production of electric porcelain products, and particularly relates to a method and system for adjusting water content of spray granulation powder. BACKGROUND

[0002] The isostatic pressing forming process is widely applied in production of pillar porcelain insulators, which can make the blank body bear force uniformly and have uniform density distribution, effectively improving product performance. The isostatic pressing forming pillar porcelain insulator production line uses raw materials from the spray granulation powder in the high-temperature drying chamber, and the water content of the spray granulation powder as the key raw material for isostatic pressing forming plays a decisive role in product quality. Unsuitable powder water content can cause defects such as insufficient strength, cracking and deformation of the blank body, seriously affecting the production quality and efficiency of the pillar porcelain insulator. Therefore, it is necessary to accurately control the water content of the spray granulation powder.

[0003] When the high-temperature drying chamber prepares the powder, the artificial measures the powder water content every 1-2 hours, and after the result is obtained, the adjustment is made again when the water content is out of standard. The powder with out-of-standard water content has already entered the bin and cannot be corrected, which causes problems such as untimely water content control, lagging adjustment and large water content fluctuation. SUMMARY

[0004] The application aims to provide a method and system for adjusting water content of spray granulation powder, to solve the technical problems of untimely water content control and lagging adjustment of the spray granulation powder in the prior art.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical solutions: A method for adjusting water content of spray granulation powder, comprising the following steps: Set initial operation parameters of main air fan frequency conversion, natural gas pressure, natural gas flow and slurry feeding plunger pump pressure, and run the spray drying chamber; Measure the powder water content value at the discharge port of the spray drying chamber by using an infrared moisture meter, and send the powder water content value measured by the infrared moisture meter to an industrial computer; sample the powder at the discharge port of the spray drying chamber, and measure the powder water content value by using a general moisture meter; Compare the powder water content value measured by the general moisture meter, the powder water content value measured by the infrared moisture meter and the powder water content process range requirement; Adjust the inlet temperature of the spray drying chamber or the slurry feeding plunger pump pressure until the powder water content value measured by the general moisture meter meets the powder water content process range requirement, and adjust the translation amount in the industrial computer until the difference between the powder water content display value on the industrial computer and the powder water content value measured by the general moisture meter is within the error range.

[0006] Further, the initial operation parameters of the main air fan frequency conversion, the natural gas pressure, the natural gas flow and the slurry feeding plunger pump pressure are respectively: The main fan frequency is 38-47 Hz, the natural gas pressure is 8-10 KPa, and the natural gas flow is 98-110 m 3 / h, and the pump pressure of the slurry column is 1.6-1.9 MPa.

[0007] Further, after the operation of the spray drying chamber, the relative pressure is kept at -42 to -32 Pa, the inlet temperature is 400-600 ℃, and the outlet temperature is 120-140 ℃.

[0008] Further, the steps for sampling the powder from the discharge port of the spray drying chamber and determining the moisture value of the powder by using a general moisture meter are as follows: Manually sampling the powder from the discharge port of the spray drying chamber, stirring the powder sample evenly, and weighing 6-8 g; After stirring evenly, the weighed powder is placed in a general moisture meter for heating, and the moisture value of the powder is measured.

[0009] Further, the adjustment of the inlet temperature of the spray drying chamber or the pressure of the slurry column piston pump until the moisture value of the powder determined by the general moisture meter meets the process range requirement includes: When the moisture value of the powder determined by the general moisture meter exceeds the upper limit of the process range requirement, increase the inlet temperature of the spray drying chamber to 425-485 ℃ or reduce the pressure of the slurry column piston pump; When the moisture value of the powder determined by the general moisture meter is lower than the lower limit of the process range requirement, reduce the inlet temperature of the spray drying chamber to 385-425 ℃ or increase the pressure of the slurry column piston pump.

[0010] Further, the moisture value range of the powder required by the process is 0.6%-1.0%.

[0011] Further, the adjustment mode of the inlet temperature of the spray drying chamber at least includes the adjustment of the natural gas flow.

[0012] Further, adjust the translation amount in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value determined by the general moisture meter is within the error range, which includes: When the difference between the powder moisture value determined by the general moisture meter and the powder moisture display value on the industrial computer exceeds the error range, increase or decrease the translation amount in the industrial computer: When the error between the powder moisture value determined by the general moisture meter and the difference between the powder moisture display value on the industrial computer is within the error range, put the industrial computer from manual state to automatic state.

[0013] The error range is -0.1%-0.1%.

[0014] In a second aspect, a spray granulation powder moisture control adjustment system includes a starting module, a measuring module, a comparing module, and an adjustment module, wherein: The starting module is used to set initial operation parameters of the main air blower frequency conversion, natural gas pressure, natural gas flow, and slurry plunger pump pressure, and to operate the spray drying chamber. The measuring module is used to measure the powder moisture value at the discharge port of the spray drying chamber by using an infrared moisture meter, and to send the powder moisture value measured by the infrared moisture meter to the industrial computer. The comparing module is used to compare the powder moisture value measured by the ordinary moisture meter, the powder moisture value measured by the infrared moisture meter, and the process range requirement of the powder moisture. The adjustment module is used to adjust the inlet temperature of the spray drying chamber or the slurry plunger pump pressure until the powder moisture value measured by the ordinary moisture meter meets the process range requirement, and to adjust the translation amount in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value measured by the ordinary moisture meter is within the error range.

[0015] Compared with the prior art, the present application has the following beneficial technical effects: The present application provides a spray granulation powder moisture control adjustment method, which controls the inlet temperature, outlet temperature, indoor negative pressure, plunger pump slurry pressure, and natural gas pressure and flow of the high-temperature drying chamber, operates the spray drying chamber, and compares the powder moisture value measured by the ordinary moisture meter, the powder moisture value measured by the infrared moisture meter, and the process range requirement. The powder moisture value measured by the ordinary moisture meter is used as the reference value, the natural gas flow, temperature, and plunger pump pressure are automatically adjusted by the online infrared moisture meter and the industrial computer in real time, the dynamic closed-loop control of the moisture is realized, the problem of manual detection lag is solved, the difference with the reference value is reduced through the adjustment of multiple parameters, the deviation between the reference value and the infrared measurement value is corrected by adjusting the translation amount, and the compliance rate of the powder moisture measurement is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The present application provides a spray granulation powder moisture control adjustment method, which controls the inlet temperature, outlet temperature, indoor negative pressure, plunger pump slurry pressure, and natural gas pressure and flow of the high-temperature drying chamber, operates the spray drying chamber, and compares the powder moisture value measured by the ordinary moisture meter, the powder moisture value measured by the infrared moisture meter, and the process range requirement. The powder moisture value measured by the ordinary moisture meter is used as the reference value, the natural gas flow, temperature, and plunger pump pressure are automatically adjusted by the online infrared moisture meter and the industrial computer in real time, the dynamic closed-loop control of the moisture is realized, the problem of manual detection lag is solved, the difference with the reference value is reduced through the adjustment of multiple parameters, the deviation between the reference value and the infrared measurement value is corrected by adjusting the translation amount, and the compliance rate of the powder moisture measurement is greatly improved. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0018] In the description of the present application, it should be understood that the terms "include" and "contain" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0019] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range without departing from the scope of the embodiments of the present application.

[0021] As shown in Figure 1 A method for adjusting the moisture control of a spray granulation powder, comprising the following steps: Step 1: Set the initial operating parameters of the main fan frequency conversion, natural gas pressure, natural gas flow and slurry plunger pump pressure, and run the spray drying chamber; In detail, start the main fan. The main fan frequency conversion is set to (38-47) Hz, so that the relative pressure in the spray drying chamber is maintained at (-42-32) Pa. Press the burner ignition button, and after the natural gas in the burner is normally burned, the natural gas pressure is controlled at (8-10) kPa, and the flow is controlled at (98-110) m 3 / h. Increase the inlet temperature of the hot air into the chamber, and within 30 min, the inlet temperature in the drying chamber is increased to (400-460) ℃, and the outlet temperature is increased to (220-240) ℃.

[0022] Start the slurry plunger pump, adjust the slurry pipeline pressure to (1.6-1.9) MPa, open the valve at the front end of the centrifugal atomizer pipeline, start spray granulation, and the outlet temperature in the drying chamber gradually decreases to (120-140) ℃.

[0023] Step 2: Determine the moisture value of the powder at the discharge port of the spray drying chamber by using an infrared moisture meter, and send the powder moisture value measured by the infrared moisture meter to the industrial computer. Sample the powder at the discharge port of the spray drying chamber, and determine the powder moisture value by using a general moisture meter The probe part of the online infrared moisture meter measures the moisture of the powder flowing on the belt every 5 min, and transmits the signal to the industrial computer connected to the main machine.

[0024] The sample is taken manually from the discharge port, stirred uniformly, weighed (6-8) g, and placed in a normal moisture meter for heating.

[0025] Step three, comparing the powder moisture value measured by the normal moisture meter, the powder moisture value measured by the infrared moisture meter, and the powder moisture process range requirement; Step four, adjusting the inlet temperature of the spray drying chamber or the pressure of the slurry piston pump until the powder moisture value measured by the normal moisture meter meets the process range requirement, and adjusting the translation amount in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value measured by the normal moisture meter is within the error range; Among them, adjusting the inlet temperature of the spray drying chamber or the pressure of the slurry piston pump until the powder moisture value measured by the normal moisture meter meets the process range requirement includes: When the powder moisture value measured by the normal moisture meter exceeds the upper limit of the process range requirement, increasing the inlet temperature of the spray drying chamber or reducing the pressure of the slurry piston pump; When the powder moisture value measured by the normal moisture meter is lower than the lower limit of the process range requirement, reducing the inlet temperature of the spray drying chamber or increasing the pressure of the slurry piston pump.

[0026] Specifically, the powder moisture value range required by the process is 0.6%-1.0%, the increased inlet temperature of the spray drying chamber is maintained at (425-485) ℃, and the reduced inlet temperature of the spray drying chamber is maintained at (385-425) ℃. There are multiple ways to adjust the inlet temperature, at least including adjusting the natural gas flow.

[0027] Adjusting the translation amount in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value measured by the normal moisture meter is within the error range includes: When the difference between the powder moisture value measured by the normal moisture meter and the powder moisture display value on the industrial computer exceeds the error range, increasing or decreasing the translation amount in the industrial computer: When the difference between the error of the powder moisture value measured by the normal moisture meter and the powder moisture display value on the industrial computer is within the error range, the industrial computer is put into the automatic state from the manual state.

[0028] Optionally, the error range is set to -0.1%-0.1%, the powder moisture value measured by the normal moisture meter is 0.1% higher than the powder moisture display value on the industrial computer, the "control parameter" translation amount in the program of the industrial computer needs to be translated, and based on the translation amount, 0.05 is added. The powder moisture value measured by the normal moisture meter is 0.1% lower than the powder moisture display value on the industrial computer, and the translation amount needs to be reduced by 0.05. The difference between the normal value and the control value is within 0.1%, and the industrial computer can be put into the automatic state from the manual state without adjustment.

[0029] This invention monitors moving powders, introduces an online infrared moisture meter, and implements upgrades tailored to specific circumstances. Through a series of environmental and energy-saving measures, it reduces adverse environmental impacts, improves resource utilization efficiency, and achieves sustainable development. Specifically, these measures include improving production processes, strengthening pollution control, reducing waste gas and wastewater emissions, improving environmental quality, and protecting ecological balance. This has positive implications for alleviating environmental issues such as air and water pollution, and contributes to building a green, low-carbon ecosystem.

[0030] The present invention mainly controls the opening size of the natural gas valve, the pressure flow of natural gas, the inlet temperature, the plunger pump pressure, the fan frequency conversion size and other parameters to form solid powder or hollow spherical granular powder. The distribution of powder moisture and particle size meets the requirements of process regulations.

[0031] Example 1 For better explanation, let's take a spray granulation drying room as an example. The powder moisture control range is (0.6-1.0)%. The baseline value of the industrial computer is 2.0; The working principle of a spray drying chamber is to introduce hot air from natural gas combustion into the drying chamber from the top. A centrifugal atomizer in the center of the drying chamber, driven by a high-pressure pump, sprays liquid droplets upward from the bottom. These droplets come into contact with the hot air, instantly evaporating most of the droplets' moisture. The droplets gradually dry and solidify into a powder or granular product (hereinafter referred to as powder). Within the drying chamber, the airflow also gradually transforms the particles into fine, hollow spherical particles.

[0032] An online infrared moisture meter is installed vertically on the conveyor belt below the spray chamber discharge port. The probe of the online infrared moisture meter accurately measures the moisture content of the powder flowing on the belt and transmits the signal to the host computer, which is connected to the industrial computer. The industrial computer is installed with conditional system software to set the median value and upper and lower limits of the powder moisture control. An electric actuator is installed at the front end of the natural gas burner, and its adjustment is controlled by an industrial computer. Based on the moisture signal transmitted by the main engine, the industrial computer analyzes and determines whether the moisture content is within the upper and lower limits of the powder's median moisture content. If it is outside these limits, the industrial computer sends a signal to the electric actuator to adjust the opening of the natural gas valve, that is, the natural gas flow rate, to control the temperature of the hot air entering the room, thereby controlling the instantaneous evaporation rate of the majority of the water droplets in the atomized mud.

[0033] In the first stage, start the main fan. Adjust the frequency of the main fan to (38-40) Hz to keep the relative pressure in the spray drying chamber at (-35--32) Pa. Press the burner ignition button. After the natural gas in the burner burns normally, the natural gas pressure is controlled at (8-10) kPa and the flow rate is controlled at (105-110) m 3 / h; The temperature of the hot air into the drying chamber is increased by increasing the flow of natural gas, and the temperature of the inlet of the drying chamber is increased to (450-460) °C and the temperature of the outlet is increased to (220-240) °C within 30 minutes. The slurry plunger pump is started, the pressure of the slurry pipeline is adjusted to (1.6-1.7) MPa, the valve at the front end of the centrifugal atomizer pipeline is opened, the spray granulation is started, and the temperature of the outlet of the drying chamber is gradually decreased to (120-140) °C. The moisture of the powder flowing on the belt is measured every 5 minutes by the on-line infrared moisture meter probe, and the signal is transmitted to the industrial computer connected to the main machine. Specifically, during the starting stage, the parameter adjustment changes are shown in Table 1: Table 1, adjustment table during the starting stage

[0034] In the second stage, the sample is taken from the discharge port by hand, stirred evenly, weighed (6-8) g, placed in a general moisture meter for heating, and after completion, the data displayed on the instrument (referred to as the general value) are compared with the process range. The process range requires that the moisture value of the powder is in the range of 0.6%-1.0%: If the general value is higher than the upper limit (1.0%), the following method is used for adjustment: The flow of natural gas is controlled at (110-112) m 3 / h. The temperature of the hot air into the drying chamber is adjusted so that the temperature of the inlet of the drying chamber is (465-485) °C; or the inlet temperature remains unchanged, and the pressure of the slurry plunger pump is reduced to (1.3-1.5) MPa. Table 2 shows the adjustment table when the general value is higher than the upper limit of the process range: Table 2, adjustment table when the general value is higher than the upper limit of the process range

[0035] If the general value is lower than the lower limit (0.6%), the following method is used for adjustment: the flow of natural gas is controlled at (102-105) m 3 / h. The temperature of the hot air into the drying chamber is adjusted so that the temperature of the inlet of the drying chamber is (425-445) °C. Or the inlet temperature remains unchanged, and the pump pressure is increased to (1.7-1.8) MPa. Table 3 shows the adjustment table when the general value is lower than the lower limit of the process range: Table 3, adjustment table when the general value is lower than the lower limit of the process range

[0036] In the third stage, the value displayed on the industrial computer (referred to as the control value) is compared with the general value: If the process value is higher than the control value by 0.1%, the "control parameter" in the program of the industrial computer is translated by 0.05 based on the reference value; if the process value is lower than the control value by 0.1%, the translation is reduced by 0.05. If the process value is within 0.1% of the control value, no adjustment is needed. The industrial computer is switched from manual to automatic state, and the translation changes are shown in Table 4: Table 4, translation changes

[0037] Through the adjustment of the above-mentioned parameters, the difference between the measured value of the infrared moisture meter and the reference value measured by the ordinary moisture meter is reduced, and the deviation between the reference value and the infrared measured value is corrected by adjusting the translation. After the present embodiment, the moisture measurement results and effects of the powder are as shown in Table 5: Table 5, deviation of two measured values and effect evaluation

[0038] Effect evaluation criteria: within 0.03 deviation, excellent; within 0.06 deviation, good; within 0.1 deviation, better. As can be seen from Table 5, the deviation between the adjusted powder moisture and the reference value and the infrared measured value meets the requirements.

[0039] Example 2 For better illustration, an example of a spray granulation drying chamber is given, and the powder moisture control range is (0.6-1.0)%. The reference value of the industrial computer is 2.0; An online infrared moisture meter is installed in the vertical direction of the transport belt below the discharge port of the spray chamber. The probe part of the online infrared moisture meter accurately measures the moisture of the powder flowing on the belt and transmits the signal to the main machine. The main machine is connected to the industrial computer, and the industrial computer is installed with conditional system software to set the powder moisture control median value and upper and lower limits; An electric actuator is installed at the front end of the natural gas burner, and the adjustment of the actuator is controlled by the industrial computer. The industrial computer analyzes and judges whether the powder moisture is within the upper and lower limit range of the median value based on the moisture signal from the main machine. If it exceeds this range, the industrial computer sends a signal instruction to the electric actuator to adjust the opening size of the natural gas valve, i.e. the flow rate of the natural gas, to control the temperature of the hot air entering the chamber, thereby controlling the instantaneous evaporation rate of most of the liquid droplets in the atomized slurry.

[0040] In the first stage, the main fan is started. The main fan is frequency-adjusted to (41-43) Hz to keep the relative pressure in the spray drying chamber at (-36- -38) Pa. The burner ignition button is pressed, and after the natural gas in the burner burns normally, the natural gas pressure is controlled at (8-10) kPa, and the flow rate is controlled at (102-105) m 3 / h.

[0041] The temperature of the hot air into the drying chamber is increased by increasing the flow of natural gas, and the temperature of the inlet of the drying chamber is increased to (420-430) °C and the temperature of the outlet is increased to (220-240) °C within 30 minutes.

[0042] The slurry plunger pump is started, the pressure of the slurry pipeline is adjusted to (1.7-1.8) MPa, the valve at the front end of the centrifugal atomizer pipeline is opened, and the spray granulation is started. The temperature of the outlet of the drying chamber is gradually decreased to (120-140) °C. The moisture of the powder flowing on the belt is measured every 5 minutes by the on-line infrared moisture meter probe, and the signal is transmitted to the industrial computer connected to the main machine. The first stage adjustment changes are shown in Table 6: Table 6, first stage adjustment table

[0043] In the second stage, the sample is taken from the discharge port manually, and after being stirred evenly, (6-8) g is weighed and placed in a general moisture meter for heating. After completion, the data displayed on the instrument (hereinafter referred to as the general value) are compared with the values displayed on the industrial computer (hereinafter referred to as the control value). The process range requires that the moisture value of the powder be in the range of 0.6%-1.0%: If the general value is higher than the upper limit (1.0%), the following method is used for adjustment: The flow of natural gas is controlled at (106-110) m 3 / h. The temperature of the hot air into the drying chamber is adjusted so that the temperature of the inlet of the drying chamber is (435-455) °C; or the inlet temperature remains unchanged, and the pump pressure is adjusted to (1.4-1.6) MPa. Table 7 is the adjustment table when the general value is higher than the upper limit (1.0%): Table 7, adjustment table when the general value is higher than the upper limit (1.0%)

[0044] If the general value is lower than the lower limit (0.6%), the following method is used for adjustment: the flow of natural gas is controlled at (96-100) m 3 / h. The temperature of the hot air into the drying chamber is adjusted so that the temperature of the inlet of the drying chamber is (400-420) °C. Or the inlet temperature remains unchanged, and the pump pressure is adjusted to (1.8-1.9) MPa. Table 8 is the adjustment table when the general value is lower than the lower limit (0.6%): Table 8, adjustment table when the general value is lower than the lower limit (0.6%)

[0045] In the third stage, the value displayed on the industrial computer (hereinafter referred to as the control value) is compared with the general value: If the process value is higher than the control value by 0.1%, the "control parameter" in the program of the industrial computer is translated by 0.05 based on the reference value; if the process value is lower than the control value by 0.1%, the translation is reduced by 0.05. If the process value is within 0.1% of the control value, no adjustment is needed. The industrial computer is switched from manual to automatic state, and the translation adjustment is shown in Table 9: Table 9, translation adjustment table

[0046] By adjusting the above parameters, the difference between the measured value of the infrared moisture meter and the reference value measured by the ordinary moisture meter is reduced, and the deviation between the reference value and the infrared measured value is corrected by adjusting the translation. After the present embodiment, the moisture measurement results and effects of the powder are shown in Table 10: Table 10, deviation of two measured values and effect evaluation

[0047] Effect evaluation standard: within 0.03 deviation, excellent; within 0.06 deviation, good; within 0.1 deviation, better. As can be seen from Table 10, the deviation between the adjusted powder moisture and the reference value and the infrared measured value meets the requirements.

[0048] Example 3 In order to better illustrate, now take a spray granulation drying chamber as an example, the powder moisture control range is (0.6-1.0)%. The reference value of the industrial computer is 2.0; A online infrared moisture meter is installed in the vertical direction of the transport belt below the discharge port of the spray chamber. The probe part of the online infrared moisture meter accurately measures the moisture of the powder flowing on the belt and transmits the signal to the main machine. The main machine is connected with the industrial computer, and the industrial computer is installed with conditional system software to set the middle value and upper and lower limits of the powder moisture control; An electric actuator is installed at the front end of the natural gas burner, and the adjustment of the actuator is controlled by the industrial computer. According to the moisture signal transmitted by the main machine, the industrial computer analyzes and judges whether it is within the upper and lower limits of the middle value of the powder moisture. If it exceeds this range, the industrial computer sends a signal instruction to the electric actuator to adjust the opening size of the natural gas valve, i.e. the flow of natural gas, to control the temperature of the hot air entering the room, so as to control the instantaneous evaporation rate of most of the liquid droplets in the atomized slurry.

[0049] In the first stage, the main fan is started. The main fan is frequency converted to (45-47) Hz to keep the relative pressure in the spray drying chamber at (-40- -42) Pa. Press the burner ignition button, and after the natural gas in the burner is normally burned, the natural gas pressure is controlled at (8-10) kPa, and the flow is controlled at (98-101) m 3 / h.

[0050] By increasing the opening of the front end electric actuator of the natural gas burner, the natural gas flow is increased to increase the hot air inlet temperature, and the inlet temperature of the drying chamber is increased to (400-415) °C within 30 min, and the outlet temperature is increased to (220-240) °C.

[0051] The slurry plunger pump is started, the mud pipeline pressure is adjusted to (1.8-1.9) MPa, the valve at the front end of the centrifugal atomizer pipeline is opened, the spray granulation is started, and the outlet temperature of the drying chamber is gradually decreased to (120-140) °C. The moisture content of the powder flowing on the belt is measured every 5 min by the on-line infrared moisture meter probe, and the signal is transmitted to the industrial computer connected with the main machine. The adjustment process table in the starting stage is shown in Table 11: Table 11, adjustment process table in the starting stage

[0052] In the second stage, the sample is taken from the discharge port manually, and after being stirred uniformly, (6-8) g is weighed and placed in a general moisture meter for heating. After completion, the data displayed on the instrument (hereinafter referred to as the general value) are compared with the values displayed on the industrial computer (hereinafter referred to as the control value).

[0053] When the general value is higher than the upper limit (1.0%), the natural gas flow is controlled at (102-105) m 3 / h. The hot air inlet temperature of the drying chamber is adjusted so that the inlet temperature of the drying chamber is (425-435) °C; or the inlet temperature remains unchanged, and the pump pressure is adjusted to (1.7-1.8) MPa. The adjustment when the powder moisture content measured by the general moisture meter is higher than the upper limit of the process range is shown in Table 12: Table 12, adjustment table when the powder moisture content measured by the general moisture meter is higher than the upper limit of the process range

[0054] When the general value is lower than the lower limit (0.6%), the natural gas flow is controlled at (92-95) m 3 / h. The hot air inlet temperature of the drying chamber is adjusted so that the inlet temperature of the drying chamber is (385-395) °C. Or the inlet temperature remains unchanged, and the pump pressure is adjusted to (1.9-2.0) MPa. The adjustment when the powder moisture content measured by the general moisture meter is lower than the lower limit of the process range is shown in Table 13: Table 13, adjustment table when the powder moisture content measured by the general moisture meter is lower than the lower limit of the process range

[0055] In the third stage, the value displayed on the industrial computer (hereinafter referred to as the control value) is compared with the general value: If the general value is higher than the control value by 0.1%, the control parameter in the program of the industrial computer is translated by 0.05 based on the reference value; if the general value is lower than the control value by 0.1%, the translation is reduced by 0.05. If the difference between the general value and the control value is within 0.1%, no adjustment is needed. The industrial computer is put into the automatic state from the manual state, and the translation of the industrial computer is shown in Table 14: Table 14, translation adjustment table of the industrial computer

[0056] Through the adjustment of the above parameters, the difference between the measured value of the infrared moisture meter and the reference value measured by the ordinary moisture meter is reduced, and the deviation between the reference value and the infrared measured value is corrected by adjusting the translation. After the present embodiment, the moisture measurement results and effects of the powder are shown in Table 15: Table 15, deviation of the two measured values and effect evaluation

[0057] Effect evaluation standard: within 0.03, excellent; within 0.06, good; within 0.1, better. As shown in Table 15, the deviation between the reference value and the infrared measured value of the adjusted powder moisture meets the requirements.

[0058] In another embodiment of the present application, a spray granulation powder moisture control adjustment system is also provided, which comprises a starting module, a measurement module, a comparison module and an adjustment module, wherein: The starting module is used to set the initial operation parameters of the frequency conversion of the main fan, the natural gas pressure, the natural gas flow and the pressure of the slurry feeding piston pump, and to operate the spray drying chamber; The measurement module is used to measure the powder moisture value at the discharge port of the spray drying chamber by using the infrared moisture meter, and to send the powder moisture value measured by the infrared moisture meter to the industrial computer. The powder is sampled from the discharge port of the spray drying chamber, and the powder moisture value is measured by using the ordinary moisture meter; The comparison module is used to compare the powder moisture value measured by the ordinary moisture meter, the powder moisture value measured by the infrared moisture meter and the process range requirement of the powder moisture; The adjustment module is used to adjust the inlet temperature of the spray drying chamber or the pressure of the slurry feeding piston pump until the powder moisture value measured by the ordinary moisture meter meets the process range requirement, and to adjust the translation in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value measured by the ordinary moisture meter is within the error range.

[0059] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical solution falls within the protection scope of the claims of the present application.

Claims

1. A method for controlling the moisture content of spray granulation powder, characterized in that: The following steps are involved: Set the initial operating parameters of the main fan frequency conversion, natural gas pressure, natural gas flow and slurry plunger pump pressure, and operate the spray drying chamber; The moisture value of the powder at the discharge port of the spray drying chamber is measured using an infrared moisture meter, and the moisture value of the powder measured by the infrared moisture meter is sent to the industrial computer. The powder sample is taken from the discharge port of the spray drying chamber and the moisture value of the powder is measured using an ordinary moisture meter. Compare the moisture value of powder measured by ordinary moisture meter, the moisture value of powder measured by infrared moisture meter and the process range requirements of powder moisture; Adjust the inlet temperature of the spray drying chamber or the pressure of the slurry plunger pump until the powder moisture value measured by the ordinary moisture meter meets the process range requirements of the powder moisture, and adjust the translation amount in the industrial computer until the difference between the powder moisture display value on the industrial computer and the powder moisture value measured by the ordinary moisture meter is within the error range.

2. The method for controlling the moisture content of spray granulation powder according to claim 1, wherein: The initial operating parameters of the main fan frequency conversion, natural gas pressure, natural gas flow and slurry delivery plunger pump pressure are: The frequency of the main fan is (38-47) Hz, the natural gas pressure is (8-10) KPa, and the natural gas flow rate is (98-110) m 3 / h, the slurry column pump pressure is (1.6-1.9) MPa.

3. The method for controlling the moisture content of spray granulation powder according to claim 1, wherein: After the spray drying chamber is in operation, the relative pressure is maintained at (-42--32) Pa, the inlet temperature is (400-600) ° C, and the outlet temperature is (120-140) ° C.

4. The method for controlling the moisture content of spray granulation powder according to claim 1, wherein: The steps of sampling the powder from the discharge port of the spray drying chamber and measuring the moisture value of the powder using a common moisture meter are as follows: Manually take samples from the discharge port of the spray drying chamber, stir the powder sample evenly, and weigh (6-8) g; The weighed powder is stirred evenly and placed in a common moisture meter for heating to measure the moisture value of the powder.

5. The method for controlling the moisture content of spray granulation powder according to claim 1, wherein: The method of adjusting the inlet temperature of the spray drying chamber or the pressure of the slurry feeding plunger pump until the moisture value of the powder measured by a common moisture meter meets the process range requirements includes: When the moisture value of the powder measured by a common moisture meter exceeds the upper limit of the process range, increase the inlet temperature of the spray drying chamber to (425-485)°C or reduce the pressure of the slurry plunger pump; When the moisture value of the powder measured by an ordinary moisture meter is lower than the lower limit of the process range, reduce the inlet temperature of the spray drying chamber to (385-425) °C or increase the pressure of the slurry plunger pump.

6. A method for controlling the moisture content of spray granulation powder according to claim 1 or 5, characterized in that: The process requires that the moisture content of the powder be in the range of 0.6% to 1.0%.

7. A method for controlling the moisture content of spray granulation powder according to claim 5, characterized in that: The method for adjusting the inlet temperature of the spray drying chamber at least includes adjusting the natural gas flow rate.

8. A method for controlling the moisture content of spray granulation powder according to claim 1, characterized in that: Adjust the translation amount in the industrial computer until the difference between the powder moisture value displayed on the industrial computer and the powder moisture value measured by an ordinary moisture meter is within the error range, including: When the difference between the powder moisture value measured by the ordinary moisture meter and the powder moisture value displayed on the industrial computer exceeds the error range, increase or decrease the translation amount in the industrial computer: When the difference between the error of the powder moisture value measured by the common moisture meter and the powder moisture display value on the industrial computer is within the error range, the industrial computer is switched from manual mode to automatic mode.

9. A method for controlling the moisture content of spray granulation powder according to claim 8, characterized in that: The error range is (-0.1%-0.1%).

10. A spray granulation powder moisture control regulating system, characterized in that: It includes a start-up module, a measurement module, a comparison module and an adjustment module, wherein: Startup module: used to set the initial operating parameters of the main fan frequency conversion, natural gas pressure, natural gas flow and slurry plunger pump pressure, and operate the spray drying chamber; Determination module: used to measure the moisture value of the powder at the discharge port of the spray drying chamber using an infrared moisture meter, and send the moisture value of the powder measured by the infrared moisture meter to the industrial computer, and take samples from the powder at the discharge port of the spray drying chamber and measure the moisture value of the powder using an ordinary moisture meter; Comparison module: used to compare the powder moisture value measured by ordinary moisture meter, the powder moisture value measured by infrared moisture meter and the powder moisture process range requirements; Adjustment module: used to adjust the inlet temperature of the spray drying chamber or the pressure of the slurry feeding plunger pump until the moisture value of the powder measured by the ordinary moisture meter meets the process range requirements, and adjust the translation amount in the industrial computer until the difference between the moisture value displayed on the industrial computer and the moisture value of the powder measured by the ordinary moisture meter is within the error range.

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