CN220026950U - Automatic safety control valve group and control net for ammonia gasification of ammonium polyphosphate reaction kettle - Google Patents
Automatic safety control valve group and control net for ammonia gasification of ammonium polyphosphate reaction kettle Download PDFInfo
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- CN220026950U CN220026950U CN202321263315.6U CN202321263315U CN220026950U CN 220026950 U CN220026950 U CN 220026950U CN 202321263315 U CN202321263315 U CN 202321263315U CN 220026950 U CN220026950 U CN 220026950U
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- ammonia
- valve
- ammonium polyphosphate
- reaction kettle
- stabilizing
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 69
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 64
- 239000004114 Ammonium polyphosphate Substances 0.000 title claims abstract description 59
- 235000019826 ammonium polyphosphate Nutrition 0.000 title claims abstract description 59
- 229920001276 ammonium polyphosphate Polymers 0.000 title claims abstract description 59
- 238000002309 gasification Methods 0.000 title claims description 36
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 36
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
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- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The utility model discloses a reaction kettle gasified ammonia safety automatic control valve group and a control network for stabilizing the polymerization degree of ammonium polyphosphate, which comprise a pressure gauge, a manual stop valve, a self-operated pressure regulating valve, a first pneumatic three-way switching valve, a first micro-pressure sensor, a proportional valve, a second micro-pressure sensor, a flow sensor and a second pneumatic three-way switching valve which are sequentially arranged on a pipeline from left to right. After the utility model is installed, in the production process, on the premise of constant total pipe pressure, the ammonia-introducing valve group of each reaction kettle can be optimized, and simultaneously, the ammonia-introducing flow and the ammonia-introducing pressure in different reaction stages can be controlled in cascade connection by the temperature and the pressure of the reaction kettle, so that the introduced ammonia amount and the introduced ammonia-introducing pressure can be automatically and accurately controlled, and the polymerization degree of the ammonium polyphosphate product can be ensured to be more stable.
Description
Technical Field
The utility model particularly relates to a reaction kettle gasified ammonia safety automatic control valve group and a control network for stabilizing the polymerization degree of ammonium polyphosphate.
Background
In the production process of ammonium polyphosphate, the polymerization reaction temperature can reach 200-350 ℃, and under the condition of not maintaining reasonable ammonia pressure and flow, the ammonium polyphosphate is easy to decompose, so that the polymerization degree of the ammonium polyphosphate is difficult to reach more than 1000. In order to ensure that ammonium polyphosphate is not decomposed under high temperature conditions, especially when producing an ammonium polyphosphate II type flame retardant product, stable ammonia gas pressure and flow in a reaction kettle are required to be maintained in order to ensure that the polymerization degree reaches more than 1000 and ideal II type crystallization; the pressure of ammonia gas for neutralization reaction is usually maintained at 2.0-4.0kg/cm2, and the flow rate is 2-10m 3 In industrial production, however, the number of reaction kettles is generally tens or more, and during production, because each reaction kettle is in different reaction stages, different ammonia gas pressure and flow are needed, and the total pipe ammonia gas pressure is generally controlled to be constant, the flow is controlled completely by manual inspection operation, and the ammonia gas flow and pressure can not be ensured to strictly meet the requirements, so that the polymerization degree of the produced product is unstable.
Disclosure of Invention
Aiming at the defects, the utility model provides the reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate, and after the reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is installed, in the production process, on the premise of constant total pipe pressure, the ammonia-introducing valve group of each reaction kettle can be optimized, and simultaneously, the ammonia-introducing flow and the ammonia-introducing pressure in different reaction stages are controlled in cascade connection by the temperature and the pressure of the reaction kettle, so that the introduced ammonia amount and the introduced ammonia-introducing pressure are automatically and accurately controlled, and the polymerization degree of ammonium polyphosphate products is ensured to be more stable.
The utility model provides a stabilize reation kettle gasification ammonia safety automatic control valves of ammonium polyphosphate degree of polymerization, includes from left to right installs manometer, manual stop valve, self-operated pressure air-vent valve, first pneumatic three-way switching valve, first micropressure sensor, proportional valve, second micropressure sensor, flow sensor and the pneumatic three-way switching valve of second on the pipeline in order.
In one or more optional embodiments of the present utility model, the reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is further provided with a precision filter, the precision filter is installed on a pipeline and is located between the self-operated pressure regulating valve and the first pneumatic three-way switching valve, and the gasified ammonia is filtered, so that the reaction in the reaction kettle is ensured to be stable.
In one or more optional embodiments of the utility model, the reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is further provided with an emergency bypass pipe, one end of the emergency bypass pipe is connected with the first pneumatic three-way switching valve, and the other end of the emergency bypass pipe is connected with the second pneumatic three-way switching valve.
In one or more alternative embodiments of the present utility model, the emergency bypass pipe is provided with a manual adjustment valve and a rotameter, and the manual adjustment valve is located between the first pneumatic three-way switching valve and the rotameter.
In one or more alternative embodiments of the present utility model, the proportional valve is an explosion-proof electric proportional valve, and the pressure gauge is an explosion-proof air source electric contact pressure gauge.
The utility model also provides a reaction kettle gasified ammonia control net for stabilizing the polymerization degree of ammonium polyphosphate.
The utility model provides a stabilize reation kettle gasification ammonia control network of ammonium polyphosphate degree of polymerization, includes gasification ammonia storage tank, house steward and N reation kettle, and a branch pipe is connected to each reation kettle, installs the master valve on the house steward, house steward one end and gasification ammonia storage tank intercommunication, and the other end is connected with a minute pipe, and the parallel connection of each branch pipe other end is on minute pipe, and N is the natural number that is greater than 10, installs the reation kettle gasification ammonia safety automatic control valves of stable ammonium polyphosphate degree of polymerization on each branch pipe.
In one or more alternative embodiments of the utility model, each reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate comprises a pressure gauge, a manual stop valve, a self-operated pressure regulating valve, a first pneumatic three-way switching valve, a first micro-pressure sensor, a proportional valve, a second micro-pressure sensor, a flow sensor and a second pneumatic three-way switching valve which are sequentially arranged on corresponding branch pipes from a main valve to the corresponding reaction kettle.
In one or more alternative embodiments of the utility model, each reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is further provided with a precision filter, and the precision filter is arranged on the corresponding branch pipe and is positioned between the self-operated pressure regulating valve and the first pneumatic three-way switching valve.
In one or more alternative embodiments of the utility model, each reaction kettle gasification ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is further provided with an emergency bypass pipe, one end of the emergency bypass pipe is connected with the first pneumatic three-way switching valve, and the other end of the emergency bypass pipe is connected with the second pneumatic three-way switching valve.
In one or more alternative embodiments of the present utility model, the emergency bypass pipe is provided with a manual adjustment valve and a rotameter, and the manual adjustment valve is located between the first pneumatic three-way switching valve and the rotameter.
The utility model has the beneficial effects that: according to the utility model, after the automatic control valve bank for ammonia gasification safety of the reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate is additionally arranged, in the production process, on the premise of constant total pipe pressure, the ammonia-introducing valve bank of each reaction kettle can be optimized, and meanwhile, the ammonia-introducing flow and the ammonia-introducing pressure in different reaction stages are controlled in cascade connection by the temperature and the pressure of the reaction kettles, so that the introduced ammonia amount and the introduced ammonia pressure are automatically and accurately controlled, and the polymerization degree of an ammonium polyphosphate product is ensured to be more stable.
Drawings
FIG. 1 is a schematic diagram of a reaction kettle gasified ammonia safety automatic control valve group structure for stabilizing the polymerization degree of ammonium polyphosphate;
FIG. 2 is a schematic diagram of the structure of a gasification ammonia control net of a reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate;
in the figure: 1. the device comprises a main valve, 2, a main pipe, 3, a gasified ammonia storage tank, 4, a reaction kettle, 5, a branch pipe, 6, a reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate, 7, a branch pipe, 60, a pressure gauge, 61, a manual stop valve, 62, a self-operated pressure regulating valve, 63, a first pneumatic three-way switching valve, 64, a first micro-pressure sensor, 65, a proportional valve, 66, a second micro-pressure sensor, 67, a flow sensor, 68, a second pneumatic three-way switching valve, 69, a precise filter, 8, an emergency bypass pipe, 81, a manual regulating valve, 82 and a rotor flowmeter.
Detailed Description
The present utility model will be further described below.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of an automatic ammonia gasification safety control valve set for a reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate.
The utility model provides a stabilize reation kettle gasification ammonia safety automatic control valves of ammonium polyphosphate degree of polymerization, includes from left to right installs pressure gauge 60, manual stop valve 61, self-operated pressure air-vent valve 62, first pneumatic three-way switching valve 63, first micropressure sensor 64, proportional valve 65, second micropressure sensor 66, flow sensor 67 and the pneumatic three-way switching valve 68 of second on the pipeline in order. The automatic control valve group is used for ammonium polyphosphate production, under the premise that the pressure of the main pipe 2 is constant, the ammonia-introducing valve group of each reaction kettle 4 can be optimized, meanwhile, the ammonia-introducing flow and the ammonia-introducing pressure of different reaction stages are controlled in a cascade connection mode through the temperature and the pressure of the reaction kettles 4, the introduced ammonia amount and the introduced pressure are automatically and accurately controlled, and the polymerization degree of an ammonium polyphosphate product is ensured to be more stable.
In one or more embodiments of the utility model, the pressure gauge 60 is a gas source electrical contact pressure gauge 60.
In one or more embodiments of the utility model, the pressure gauge 60 is an explosion proof air supply electrical contact pressure gauge 60.
In one or more specific embodiments of the present utility model, the proportional valve 65 is an electrically operated proportional valve 65.
In one or more specific embodiments of the present utility model, the electric proportional valve 65 is an explosion-proof electric proportional valve 65.
In one or more specific embodiments of the present utility model, referring again to fig. 1, the automatic safety control valve group 6 for ammonia gasification of a reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate is further provided with a precision filter 69, wherein the precision filter 69 is installed on a pipeline and is located between the self-operated pressure regulating valve 62 and the first pneumatic three-way switching valve 63, and filters the ammonia gasification, so as to ensure the stable reaction in the reaction kettle 4.
In one or more embodiments of the present utility model, referring again to fig. 1, the automatic ammonia safety control valve set 6 for gasifying reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate is further provided with an emergency bypass pipe 8, one end of the emergency bypass pipe 8 is connected with the first pneumatic three-way switching valve 63, the other end is connected with the second pneumatic three-way switching valve 68, and the emergency bypass pipe 8 is used for emergency.
In one or more embodiments of the present utility model, referring again to fig. 1, a manual regulator valve 81 and a rotameter 82 are mounted on the emergency bypass pipe 8, the manual regulator valve 81 being located between the first pneumatic three-way switching valve 63 and the rotameter 82.
Example 2
Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an automatic ammonia gasification safety control valve set 6 for a reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate, and fig. 2 is a schematic structural diagram of an ammonia gasification control net for a reaction kettle 4 for stabilizing the polymerization degree of ammonium polyphosphate.
The utility model provides a stabilize reation kettle 4 gasification ammonia control network of ammonium polyphosphate degree of polymerization, including gasification ammonia storage tank 3, house steward 2 and N reation kettle 4, a branch pipe 5 is connected to each reation kettle 4, installs master valve 1 on the house steward 2, house steward 2 one end and gasification ammonia storage tank 3 intercommunication, and the other end is connected with a branch pipe 7, and the other end parallel connection of each branch pipe 5 is on branch pipe 7, and N is the natural number that is greater than 10, installs the reation kettle gasification ammonia safety automatic control valves 6 of stable ammonium polyphosphate degree of polymerization on each branch pipe 5.
In one or more specific embodiments of the present utility model, each of the automatic reaction kettle ammonia gasification safety control valve groups 6 for stabilizing the polymerization degree of ammonium polyphosphate includes a pressure gauge 60, a manual shut-off valve 61, a self-operated pressure regulating valve 62, a first pneumatic three-way switching valve 63, a first micro-pressure sensor 64, a proportional valve 65, a second micro-pressure sensor 66, a flow sensor 67, and a second pneumatic three-way switching valve 68, which are sequentially installed on the corresponding branch pipe 5 from the main valve 1 toward the corresponding reaction kettle 4. The automatic control valve group is used for ammonium polyphosphate production, under the premise that the pressure of the main pipe 2 is constant, the ammonia-introducing valve group of each reaction kettle 4 can be optimized, meanwhile, the ammonia-introducing flow and the ammonia-introducing pressure of different reaction stages are controlled in a cascade connection mode through the temperature and the pressure of the reaction kettles 4, the introduced ammonia amount and the introduced pressure are automatically and accurately controlled, and the polymerization degree of an ammonium polyphosphate product is ensured to be more stable.
In one or more embodiments of the utility model, the pressure gauge 60 is a gas source electrical contact pressure gauge 60.
In one or more embodiments of the utility model, the pressure gauge 60 is an explosion proof air supply electrical contact pressure gauge 60.
In one or more specific embodiments of the present utility model, the proportional valve 65 is an electrically operated proportional valve 65.
In one or more specific embodiments of the present utility model, the electric proportional valve 65 is an explosion-proof electric proportional valve 65.
In one or more embodiments of the present utility model, referring again to fig. 1, each automatic ammonia gasification safety control valve group 6 for stabilizing the polymerization degree of ammonium polyphosphate is further provided with a precision filter 69, and the precision filter 69 is installed on the corresponding branch pipe 5, and is located between the self-operated pressure regulating valve 62 and the first pneumatic three-way switching valve 63, so as to filter the gasified ammonia, thereby ensuring the stable reaction in the reaction kettle 4.
In one or more embodiments of the present utility model, referring again to fig. 1, each automatic ammonia gasification safety control valve set 6 for stabilizing the polymerization degree of ammonium polyphosphate reaction kettle is further provided with an emergency bypass pipe 8, one end of the emergency bypass pipe 8 is connected to the first pneumatic three-way switching valve 63, the other end is connected to the second pneumatic three-way switching valve 68, and the emergency bypass pipe 8 is used for emergency.
In one or more embodiments of the present utility model, referring again to fig. 1, a manual regulator valve 81 and a rotameter 82 are mounted on the emergency bypass pipe 8, the manual regulator valve 81 being located between the first pneumatic three-way switching valve 63 and the rotameter 82.
After the automatic control valve group 6 for ammonia gasification safety of the reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate is additionally arranged, in the production process, under the premise of constant pressure of the main pipe 2, the ammonia-introducing valve group of each reaction kettle 4 can be optimized, meanwhile, cascade associated control is carried out on the ammonia-introducing flow and pressure of different reaction stages through the temperature and pressure of the reaction kettles 4, the introduced ammonia amount and pressure are automatically and accurately controlled, and the polymerization degree of ammonium polyphosphate products is ensured to be more stable.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (9)
1. The reaction kettle gasified ammonia safety automatic control valve group for stabilizing the polymerization degree of ammonium polyphosphate is characterized by comprising a pressure gauge (60), a manual stop valve (61), a self-operated pressure regulating valve (62), a first pneumatic three-way switching valve (63), a first micro-pressure sensor (64), a proportional valve (65), a second micro-pressure sensor (66), a flow sensor (67) and a second pneumatic three-way switching valve (68) which are sequentially arranged on a pipeline from left to right.
2. The automatic control valve group for the safety of the gasification ammonia of the reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate according to claim 1, wherein the automatic control valve group for the safety of the gasification ammonia of the reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate (6) is further provided with a precision filter (69).
3. The automatic control valve bank for the safety of the gasification ammonia of the reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate according to claim 1, wherein the automatic control valve bank for the safety of the gasification ammonia of the reaction kettle for stabilizing the polymerization degree of ammonium polyphosphate (6) is further provided with an emergency bypass pipe (8), one end of the emergency bypass pipe (8) is connected with a first pneumatic three-way switching valve (63), and the other end of the emergency bypass pipe is connected with a second pneumatic three-way switching valve (68).
4. The automatic control valve bank for safety of ammonia gasification in a reaction kettle for stabilizing polymerization degree of ammonium polyphosphate according to claim 3, wherein a manual adjusting valve (81) and a rotameter (82) are installed on the emergency bypass pipe (8), and the manual adjusting valve (81) is located between the first pneumatic three-way switching valve (63) and the rotameter (82).
5. The automatic control valve bank for ammonia gasification safety of reaction kettle for stabilizing polymerization degree of ammonium polyphosphate according to claim 1, wherein the pressure gauge (60) is an air source electric contact pressure gauge, and the proportional valve (65) is an explosion-proof electric proportional valve.
6. The utility model provides a stabilize reation kettle gasification ammonia control network of ammonium polyphosphate degree of polymerization, including gasification ammonia storage tank (3), house steward (2) and N reation kettle (4), a branch pipe (5) are connected to each reation kettle (4), install master valve (1) on house steward (2), house steward (2) one end and gasification ammonia storage tank (3) intercommunication, the other end is connected with a branch pipe (7), the other end parallel connection of each branch pipe (5) is on branch pipe (7), N is the natural number that is greater than 10, characterized in that, install a reation kettle gasification ammonia safety automatic control valve group (6) of stable ammonium polyphosphate degree of polymerization on each branch pipe (5); each reaction kettle gasified ammonia safety automatic control valve group (6) for stabilizing the polymerization degree of ammonium polyphosphate comprises a pressure gauge (60), a manual stop valve (61), a self-operated pressure regulating valve (62), a first pneumatic three-way switching valve (63), a first micro-pressure sensor (64), a proportional valve (65), a second micro-pressure sensor (66), a flow sensor (67) and a second pneumatic three-way switching valve (68) which are sequentially arranged on the corresponding branch pipe (5) from the main valve (1) to the corresponding reaction kettle (4).
7. The ammonia control net for the reaction kettle gasification of stabilizing the polymerization degree of ammonium polyphosphate according to claim 6, wherein each ammonia safety automatic control valve group (6) for the reaction kettle gasification of stabilizing the polymerization degree of ammonium polyphosphate is further provided with a precision filter (69), and the precision filter (69) is arranged on the corresponding branch pipe (5) and is positioned between the self-operated pressure regulating valve (62) and the first pneumatic three-way switching valve (63).
8. The ammonia control net for gasifying reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate according to claim 6, wherein each ammonia safety automatic control valve group (6) for gasifying reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate is further provided with an emergency bypass pipe (8), one end of the emergency bypass pipe (8) is connected with a first pneumatic three-way switching valve (63), the other end of the emergency bypass pipe is connected with a second pneumatic three-way switching valve (68), and the emergency bypass pipe (8) is used for emergency.
9. The ammonia control net for gasifying reaction kettles for stabilizing the polymerization degree of ammonium polyphosphate according to claim 8, wherein a manual regulating valve (81) and a rotameter (82) are installed on the emergency bypass pipe (8), and the manual regulating valve (81) is located between the first pneumatic three-way switching valve (63) and the rotameter (82).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321263315.6U CN220026950U (en) | 2023-05-24 | 2023-05-24 | Automatic safety control valve group and control net for ammonia gasification of ammonium polyphosphate reaction kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321263315.6U CN220026950U (en) | 2023-05-24 | 2023-05-24 | Automatic safety control valve group and control net for ammonia gasification of ammonium polyphosphate reaction kettle |
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| Publication Number | Publication Date |
|---|---|
| CN220026950U true CN220026950U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321263315.6U Active CN220026950U (en) | 2023-05-24 | 2023-05-24 | Automatic safety control valve group and control net for ammonia gasification of ammonium polyphosphate reaction kettle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220026950U (en) |
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2023
- 2023-05-24 CN CN202321263315.6U patent/CN220026950U/en active Active
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