CN103472869A - Oil product storage tank constant-temperature energy-saving automatic control method and device - Google Patents
Oil product storage tank constant-temperature energy-saving automatic control method and device Download PDFInfo
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- CN103472869A CN103472869A CN 201310405457 CN201310405457A CN103472869A CN 103472869 A CN103472869 A CN 103472869A CN 201310405457 CN201310405457 CN 201310405457 CN 201310405457 A CN201310405457 A CN 201310405457A CN 103472869 A CN103472869 A CN 103472869A
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Abstract
The invention relates to an oil product storage tank constant-temperature energy-saving automatic control method and device, and belongs to the field of boilers. When the temperature of an oil product is lower than a set temperature, an executing unit keeps a set open degree upper limit of a heating steam adjusting control valve, and a large amount of heating steam is continuously supplied. When the temperature of the oil product is higher than the set temperature, the executing unit keeps a set open degree lower limit of the heating steam adjusting control valve, and a small amount of heating steam is continuously supplied. When the temperature of the oil product reaches a set target temperature, a control device automatically locks the temperature of the heating steam on the outlet of a heating coil pipe at the moment to be a standard temperature or automatically locks the pressure of the heating steam on the outlet of a heating coil pipe at the moment to be standard pressure, an arithmetic unit judges a dynamic change rule of the temperature of the heating steam on the outlet of the heating coil pipe relative to the standard temperature and judges a dynamic change rule of the pressure of the heating steam on the outlet of the heating coil pipe relative to the standard pressure, a control unit outputs a control signal according to an instruction of the arithmetic unit, and an executing unit adjusts the open degree of the heating steam adjusting control valve in real time according to the control signal, controls the heating steam supplying amount in real time, and further controls the temperature of the oil product in the oil product storage tank in real time.
Description
Technical field
The present invention relates to field of boilers, specifically a kind of oil product storage tank constant temperature energy-saving autocontrol method and device thereof.
Background technology
As everyone knows, oil product storage tank is the visual plant of oil extraction, oil storage and transportation, during oil storage and transportation, need to use heating steam heated or be incubated the oil product in oil product storage tank by pipeline, the heating steam of uniform temperature is transported to the oil product storage tank heating coil and loops exchange heat or heat transmission in pipeline, to meet oil product storage tank, stores hot needs for oil product.Control real-time and accurately temperature, the setting of oil product storage tank heating steam and accurately control the temperature of different period oil product storage tank heating steams, all the time the duty of the whole oil product storage tank heat tracing of real-time optimization system, energy-conservation, reduction of discharging, consumption reduction, environmental protection to accurate control oil product storage tank oil product temperature and heat tracing system, be significant.
Oil product storage tank is used heating steam heated and be incubated the oil product in storage tank, and heating steam enters the oil product storage tank heating coil by pipeline under the drive of ebullator, and in heating coil, circulation generation exchange heat and heat transmission are to oil product heating and insulation.Crude setting tank, dehydration of crude oil tank that oil extraction is used need to be used heating steam heated and be incubated the oil water mixture in tank equally.Lower oil temperature can increase oil viscosity and be unfavorable for oil product conveying and oil and water separation, higher oil temperature can reduce oil viscosity and be conducive to oil product conveying and oil and water separation, but can increase the oil gas volatilization amount, thereby cause energy dissipation, environmental pollution, make the danger of tank field increase simultaneously.
For a long time, the heating major part of oil product storage tank is to rely on conventional temperature instrument and steam valve to carry out manually-operated by veteran staff.The heating system of oil product storage tank is multi-variable system, the heat-transfer rate of crude oil is slow, different crude oil heat-conduction coefficient is not identical yet, the oil product temperature not only had been subject to the impact of heating steam temperature but also had been subject to the impact of ambient temperature in tank, there is again very large uncertainty in manually-operated, these factors make oil product storage tank, running status that the thermal efficiency low high in the heating steam consumption for a long time, cause oil product storage tank still to exist at present the problem that the heating-up temperature error is large, the exhaust of oil amount is large.Simultaneously,, cause the oil product temperature in oil product storage tank to be difficult to effective control, thereby affect storage and the transportation of oil product in the thermal loss of conveyance conduit, heat exhaustion in oil product storage tank due to heating steam.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the invention is to provide a kind of oil product storage tank constant temperature energy-saving autocontrol method and device thereof, solves the problem that heating steam heating-up temperature error is large, consumption is high, the thermal efficiency is low, the exhaust of oil amount is large that oil product storage tank still exists at present; Solve oil product storage tank oil product temperature and be difficult to the problem of effectively controlling; Solution must not meet the heating of different periods of oil product storage tank and the problem that insulation requires automatically, exactly.
The technical solution adopted for the present invention to solve the technical problems is: a kind of oil product storage tank constant temperature energy-saving automaton, this control device is comprised of arithmetic element, control module and performance element three parts, it is characterized in that: be provided with steam heating coil in oil product storage tank, the oil product temperature transmitter be housed above steam heating coil and be connected with arithmetic element; Heating coil temperature in transmitter, heating coil inlet pressure transmitter, heating coil inlet flow rate transmitter are housed on the heating steam intake pipeline to be connected with arithmetic element respectively; At heating steam export pipeline upper heating disk pipe outlet temperature transmitter, heating coil top hole pressure degree transmitter, heating coil rate of discharge transmitter, with arithmetic element, be connected respectively, the heating steam adjusting control valve on the heating steam export pipeline is connected with performance element.
A kind of method of using aforementioned oil product storage tank constant temperature energy-saving automaton to carry out automatic control, it is characterized in that: the oil product temperature that control device presets heating coil top certain position in oil product storage tank is target temperature, the temperature parameter that the temperature transmitter be equipped with according to heating coil top certain position provides, judge in oil product storage tank, whether the oil product temperature reaches target temperature, when the oil product temperature during lower than design temperature, performance element keeps the setting aperture upper limit of heating steam adjusting control valve, continues to provide in a large number the heating steam supply, when the oil product temperature, during higher than design temperature, performance element keeps the setting aperture lower limit of heating steam adjusting control valve, continues to provide on a small quantity the heating steam supply, when the oil product temperature reaches the target setting temperature, temperature or pressure that control device automatically locks heating coil outlet heating steam now are reference temperature or pressure, arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, control module is according to the instruction output control signal of arithmetic element, performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank.
The present invention also can be achieved by the following measures: control device presets the oil product target temperature of heating coil top certain position in different period oil product storage tanks of certain time period, preset heating and cooling time and warming and cooling rate between different period oil product target temperatures of certain time period, when the oil product temperature reaches target temperature according to setting heating and cooling time and warming and cooling rate, temperature or pressure that control device automatically locks heating coil outlet heating steam now are reference temperature or pressure, arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, control module is according to the instruction output control signal of arithmetic element, performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank, to meet the outer temperature requirement different when defeated of oil product storage and oil product.
Heating coil temperature in transmitter, heating coil inlet pressure transmitter, heating coil inlet flow rate transmitter, oil product temperature transmitter, heating coil outlet temperature transmitter, heating coil top hole pressure degree transmitter, heating coil rate of discharge transmitter are all set the bound of above-mentioned various parameters, set the bound of heating steam adjusting control valve parameter simultaneously, take sound and light alarm, manually control or emergency shut-down control device measure when measured value surpasses the bound of setup parameter.The dynamic change trend parameter of temperature, pressure, flow is the rate of change of this temperature of installing certain point, pressure, flow, or is the rate of change of temperature between 2 of this systems, pressure, flow number value difference.Oil product storage tank is crude oil storage tank, diesel oil tank, heavy oil storage tank, asphalt storage, coal tar storage tank, crude setting tank or dehydration of crude oil tank.
The invention has the beneficial effects as follows, it is foundation that control device be take the oil product target temperature of heating coil top certain position in oil product storage tank, automatically lock heating steam export pipeline heating steam temperature or pressure, according to output heating steam temperature dynamic variation tendency parameter or pressure dynamic trend running parameter, the dynamic rule of heating steam temperature or pressure in the judgement heating coil, dynamic provisioning amount by analysis software and expert database reasoning computing heating steam, adjust in real time the dynamic aperture of heating steam adjusting control valve, control in real time the quantity delivered of heating steam, reduce to the full extent the heating steam waste, reduce energy resource consumption, can Comprehensive ground be carried out automatically controlling in real time by heating and the insulation of oil product storage tank, the duty of real-time optimization oil product storage tank heating all the time, insulation, accurately control the temperature of oil product in oil product storage tank, between can be at a time, different periods of section arrange respectively different oil product storage temperature and the outer defeated temperature of oil product, meet the outer oil product temperature requirement different when defeated of oil product storage and oil product, at utmost reduce the oil gas volatilization loss.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is structural representation of the present invention, is also the schematic diagram of a kind of embodiment.
Fig. 2 is control system schematic diagram of the present invention
In figure: 1. oil product storage tank, 2. heating steam intake pipeline, 3. heating steam export pipeline, 4. heating steam adjusting control valve, 5. heating coil temperature in transmitter, 6. heating coil inlet pressure transmitter, 7. heating coil inlet flow rate transmitter, 8. oil product temperature transmitter, 9. heating coil outlet temperature transmitter, 10. heating coil top hole pressure degree transmitter, 11. heating coil rate of discharge transmitter, 12. heating coil, 13. control device, 14. arithmetic element, 15. control module, 16. performance element.
Embodiment
Embodiment 1:
Shown in Fig. 1, Fig. 2, heating coil temperature in transmitter 5 is housed on heating steam intake pipeline 2 of the present invention, heating coil inlet flow rate transmitter 7 is connected with control device arithmetic element 14 respectively; Heating coil outlet temperature transmitter 9 is housed on heating steam export pipeline 3, heating coil rate of discharge transmitter 11 is connected with control device arithmetic element 14 respectively; Above the interior heating coil 12 of oil product storage tank 1, oil product temperature transmitter 8 being housed is connected with control device arithmetic element 14; Heating steam adjusting control valve 4 is housed on heating steam intake pipeline 2 to be connected with control device performance element 16.
The oil product temperature that control device 13 presets the interior heating coil 12 top certain positions of oil product storage tank 1 is target temperature.The temperature parameter that the oil product temperature transmitter 8 be equipped with according to heating coil 12 top certain positions provides, judge whether the interior oil product temperature of oil product storage tank 1 reaches target temperature, when the oil product temperature during lower than design temperature, control device performance element 16 keeps the setting aperture upper limit of heating steam adjusting control valve 4, continues to provide in a large number the heating steam supply; When the oil product temperature, during higher than design temperature, control device performance element 16 keeps the setting aperture lower limit of heating steam adjusting control valves 4, continues to provide on a small quantity the heating steam supply; When the oil product temperature reaches the target setting temperature, the temperature that control device 13 automatically locks heating coil outlet heating steam now is reference temperature.The temperature dynamic variation tendency parameter provided according to heating coil outlet temperature transmitter 9, judgement output heating steam temperature is with respect to the dynamic rule of reference temperature, dynamic provisioning amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, control device control module 15 is according to the instruction output control signal of control device arithmetic element 14, control device performance element 16 is adjusted heating steam adjusting control valve 4 apertures according to control signal, control in real time the heating steam quantity delivered, control in real time heating coil 12 heating steam output temperatures, and then the real-time interior oil product temperature of oil product storage tank 1 of accurately controlling.
Heating coil temperature in transmitter 5, heating coil inlet flow rate transmitter 7, oil product temperature transmitter 8, heating coil outlet temperature transmitter 9, heating coil rate of discharge transmitter 11 are all set the bound of above-mentioned various parameters, set the bound of heating steam adjusting control valve 4 operational factors simultaneously, transfinite and take sound and light alarm, manually-operated or the control measure such as stop in emergency.
Control device arithmetic element of the present invention is comprised of industrial computer, configuration software, application software, communication module, expert database, analysis software; The control device control module is comprised of nonshared control unit, touch-screen or PLC; The control device performance element can be frequency converter, electric actuator.The dynamic change trend parameter of the temperature related to, pressure is this and installs the temperature of certain point, the rate of change of pressure, or is the temperature between 2 of this systems, the rate of change of number pressure value difference.Oil product storage tank can be crude oil storage tank, finished diesel fuel storage tank, asphalt storage, can be also crude setting tank and dehydration of crude oil tank.The dynamic change trend parameter of temperature of the present invention, pressure is this and installs the temperature of certain point, the rate of change of pressure, or is the temperature between 2 of this systems, the rate of change of number pressure value difference.Oil product storage tank is crude oil storage tank, diesel oil tank, heavy oil storage tank, asphalt storage, coal tar storage tank, crude setting tank or dehydration of crude oil tank.
Embodiment 2:
Shown in Fig. 1, Fig. 2, heating coil inlet pressure degree transmitter 6 is housed on heating steam intake pipeline 2 of the present invention, heating coil rate of discharge transmitter 7 is connected with control device arithmetic element 14 respectively; Heating coil top hole pressure degree transmitter 10 is housed on heating steam export pipeline 3, heating coil rate of discharge transmitter 11 is connected with control device arithmetic element 14 respectively; Above the interior heating coil 12 of oil product storage tank 1, oil product temperature transmitter 8 being housed is connected with control device arithmetic element 14; Heating steam adjusting control valve 4 is housed on heating steam intake pipeline 2 to be connected with control device performance element 16.
The oil product temperature that control device 13 presets the interior heating coil of oil product storage tank 1 top certain position is target temperature.The temperature parameter that the temperature transmitter 8 be equipped with according to heating coil 12 top certain positions provides, judge in oil product storage tank, whether the oil product temperature reaches target temperature, when the oil product temperature during lower than design temperature, control device performance element 16 keeps the setting aperture upper limit of heating steam adjusting control valve 4, continues to provide in a large number the heating steam supply; When the oil product temperature, during higher than design temperature, control device performance element 16 keeps the setting aperture lower limit of heating steam adjusting control valves 4, continues to provide on a small quantity the heating steam supply; When the oil product temperature reaches the target setting temperature, the pressure that control device 13 automatically locks heating coil outlet heating steam now is datum pressure.The pressure dynamic change trend parameter provided according to heating coil top hole pressure transmitter 10, judgement output heating steam pressure is with respect to the dynamic rule of datum pressure, by analysis software and expert database reasoning computing heating steam dynamic provisioning amount and send corresponding steering order, control device control module 15 is according to the instruction output control signal of control device arithmetic element 14, control device performance element 16 is adjusted heating steam adjusting control valve 4 apertures according to control signal, control in real time the heating steam quantity delivered, control in real time heating coil 12 heating steam output pressures, and then the real-time interior oil product temperature of oil product storage tank 1 of accurately controlling.
Heating coil inlet pressure transmitter 6, heating coil inlet flow rate transmitter 7, oil product temperature transmitter 8, heating coil top hole pressure transmitter 10, heating coil rate of discharge transmitter 11 are all set the bound of above-mentioned various parameters, set the bound of heating steam adjusting control valve 4 operational factors simultaneously, transfinite and take sound and light alarm, manually-operated or the control measure such as stop in emergency.
The dynamic change trend parameter of temperature of the present invention, pressure, flow is the rate of change of this temperature of installing certain point, pressure, flow, or is the rate of change of temperature between 2 of this systems, pressure, flow number value difference.Oil product storage tank is crude oil storage tank, diesel oil tank, heavy oil storage tank, asphalt storage, coal tar storage tank, crude setting tank or dehydration of crude oil tank.
Principle of work of the present invention is:
Heating steam constantly circulation in oil product storage tank through piping and heating coil, to meet the heat demand of using of oil product heating, insulation.The heat that oil product storage tank needs is constantly to change, but relatively stable for the heating steam temperature of input oil product storage tank.When the oil product temperature, during lower than the target setting temperature, the control device performance element keeps the setting aperture upper limit of heating steam adjusting control valve, continues to provide in a large number the heating steam supply; When the oil product temperature, during higher than the target setting temperature, the control device performance element keeps the setting aperture lower limit of heating steam adjusting control valve, continues to provide on a small quantity the heating steam supply; When the oil product temperature reaches the target temperature of setting, temperature or pressure that control device automatically locks heating coil outlet heating steam now are heating steam reference temperature or pressure.The control device arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam, and send corresponding steering order, the control device control module is according to the instruction output control signal of control device arithmetic element, the control device performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank.
Control device presets the oil product target temperature of heating coil top certain position in different period oil product storage tanks of certain time period, preset different heating and cooling time and warming and cooling rates between different period oil product target temperatures of certain time period, when the oil product temperature reaches target temperature according to setting heating and cooling time and warming and cooling rate, temperature or pressure that control device automatically locks heating coil outlet heating steam now are reference temperature or pressure.The control device arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, the control device control module is according to the instruction output control signal of control device arithmetic element, the control device performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank, to meet the outer temperature requirement different when defeated of oil product storage and oil product.
Claims (6)
1. an oil product storage tank constant temperature energy-saving automaton, this control device is comprised of arithmetic element, control module and performance element three parts, it is characterized in that: be provided with steam heating coil in oil product storage tank, the oil product temperature transmitter be housed above steam heating coil and be connected with arithmetic element; Heating coil temperature in transmitter, heating coil inlet pressure transmitter, heating coil inlet flow rate transmitter are housed on the heating steam intake pipeline to be connected with arithmetic element respectively; At heating steam export pipeline upper heating disk pipe outlet temperature transmitter, heating coil top hole pressure degree transmitter, heating coil rate of discharge transmitter, with arithmetic element, be connected respectively, the heating steam adjusting control valve on the heating steam export pipeline is connected with performance element.
2. a right to use requires 1 described oil product storage tank constant temperature energy-saving automaton to carry out the method for automatically controlling, it is characterized in that: the oil product temperature that control device presets heating coil top certain position in oil product storage tank is target temperature, the temperature parameter that the temperature transmitter be equipped with according to heating coil top certain position provides, judge in oil product storage tank, whether the oil product temperature reaches target temperature, when the oil product temperature during lower than design temperature, performance element keeps the setting aperture upper limit of heating steam adjusting control valve, continues to provide in a large number the heating steam supply, when the oil product temperature, during higher than design temperature, performance element keeps the setting aperture lower limit of heating steam adjusting control valve, continues to provide on a small quantity the heating steam supply, when the oil product temperature reaches the target setting temperature, temperature or pressure that control device automatically locks heating coil outlet heating steam now are reference temperature or pressure, arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, control module is according to the instruction output control signal of arithmetic element, performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank.
3. oil product storage tank constant temperature energy-saving automaton carries out the method for automatically controlling according to claim 2, it is characterized in that said control device presets the oil product target temperature of heating coil top certain position in different period oil product storage tanks of certain time period, preset different heating and cooling time and warming and cooling rates between different period oil product target temperatures of certain time period, when the oil product temperature reaches target temperature according to setting heating and cooling time and warming and cooling rate, temperature or pressure that control device automatically locks heating coil outlet heating steam now are reference temperature or pressure, arithmetic element is according to temperature dynamic variation tendency parameter or the pressure dynamic change trend parameter of the temperature transmitter be equipped with on the heating coil export pipeline or pressure unit detection, the temperature of judgement heating coil outlet heating steam or the dynamic rule of pressure relative datum temperature or pressure, dynamic need amount by analysis software and expert database reasoning computing heating steam is also sent corresponding steering order, control module is according to the instruction output control signal of arithmetic element, performance element is adjusted the aperture of heating steam adjusting control valve in real time according to control signal, control in real time the heating steam supply, and then control in real time the oil product temperature in oil product storage tank, to meet the outer temperature requirement different when defeated of oil product storage and oil product.
4. carry out according to the described oil product storage tank constant temperature energy-saving of claim 2 or 3 automaton the method for automatically controlling, it is characterized in that said heating coil temperature in transmitter, heating coil inlet pressure transmitter, heating coil inlet flow rate transmitter, the oil product temperature transmitter, heating coil outlet temperature transmitter, heating coil top hole pressure degree transmitter, heating coil rate of discharge transmitter is all set the bound of above-mentioned various parameters, set the bound of heating steam adjusting control valve parameter simultaneously, when surpassing the bound of setup parameter, measured value takes sound and light alarm, manually control or the emergency shut-down control device measure.
5. oil product storage tank constant temperature energy-saving automaton carries out the method for automatically controlling according to claim 2, it is characterized in that the dynamic change trend parameter of said temperature, pressure, flow is the rate of change of this temperature of installing certain point, pressure, flow, or be the rate of change of temperature between 2 of this systems, pressure, flow number value difference.
6. oil product storage tank constant temperature energy-saving automaton according to claim 1, is characterized in that said oil product storage tank is crude oil storage tank, or diesel oil tank, or the heavy oil storage tank, or asphalt storage, or the coal tar storage tank, or crude setting tank, or dehydration of crude oil tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310405457 CN103472869A (en) | 2013-09-09 | 2013-09-09 | Oil product storage tank constant-temperature energy-saving automatic control method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310405457 CN103472869A (en) | 2013-09-09 | 2013-09-09 | Oil product storage tank constant-temperature energy-saving automatic control method and device |
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| CN103472869A true CN103472869A (en) | 2013-12-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152098A (en) * | 2016-07-01 | 2016-11-23 | 时建华 | A kind of distributed extensive oil tank heating system |
| CN112440403A (en) * | 2019-08-30 | 2021-03-05 | 株式会社钟化 | Apparatus and method for producing expanded beads |
| CN113023142A (en) * | 2021-04-20 | 2021-06-25 | 河北冀衡赛瑞化工有限公司 | Safe storage device of ammonium nitrate solution |
-
2013
- 2013-09-09 CN CN 201310405457 patent/CN103472869A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152098A (en) * | 2016-07-01 | 2016-11-23 | 时建华 | A kind of distributed extensive oil tank heating system |
| CN112440403A (en) * | 2019-08-30 | 2021-03-05 | 株式会社钟化 | Apparatus and method for producing expanded beads |
| CN113023142A (en) * | 2021-04-20 | 2021-06-25 | 河北冀衡赛瑞化工有限公司 | Safe storage device of ammonium nitrate solution |
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