PTMG unloading system for producing high-resilience polyurethane
By designing a PTMG unloading system for high-resilience polyurethane production, a self-circulating and nitrogen-heated design was adopted, which solved the problem of excessively high unloading pump pressure caused by valve operation errors, ensuring equipment safety and stable production.
Patent Information
- Application Number
- CN202520012093.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-01-03
AI Technical Summary
In spandex production, PTMG unloading process can lead to excessively high outlet pressure of the unloading pump due to valve operation errors, posing a risk of equipment damage and safety hazards.
Design a PTMG unloading system for producing high-resilience polyurethane, including a connector, switching valve, filter, unloading pump, one-way check valve, pressure gauge, storage tank and multiple valves. The system uses a self-circulation design to prevent excessive pressure at the unloading pump outlet in case of valve switching operation errors. A nitrogen system is used to maintain the PTMG temperature at no less than 30°C and ensure uniform distribution.
This effectively avoids excessively high outlet pressure of the unloading pump, prevents equipment damage, ensures production safety, and achieves a safe PTMG unloading process.
Smart Images
Figure CN223592405U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a PTMG unloading system for producing high resilience polyurethane. BACKGROUND
[0002] In spandex production, PTMG as main raw material, mixed with MDI to participate in spandex polymerization reaction, PTMG component in finished product spandex filament is about 76%. At present, PTMG used in workshop is purchased externally, tank truck is sent to workshop, then is transported to PTMG storage tank through unloading pump, then PTMG is transported to workshop to participate in production through feeding pump.
[0003] In actual PTMG tank truck unloading process, because many manufacturers PTMG share one unloading pump, valve on PTMG unloading pipeline needs to be switched during unloading, during PTMG unloading switch valve, because valve quantity is much, operation is frequent, operation failure condition is extremely easy to appear, leading to pump outlet pressure is high (15MPa), field pipeline, valve is leaked, even damage unloading pump and outlet pressure gauge condition, bring great security risk to production. UTILITY MODEL CONTENTS
[0004] The utility model solves technical problem, in order to provide a PTMG unloading system for producing high resilience polyurethane guarantee normal unloading, ensure PTMG in unloading pump import and export self-circulation when valve switch operation failure, avoid unloading pump outlet pressure is high, cause equipment damage and production safety accident.
[0005] The utility model is realized as follows: a PTMG unloading system for producing high resilience polyurethane is used for connecting workshop, including joint, be equipped with switch valve on the joint, including filter, unloading pump, check valve, pressure gauge, first PTMG storage tank, second PTMG storage tank, first valve, second valve, third valve, first feeding pump, fourth valve, fifth valve, second feeding pump, sixth valve;
[0006] The switch valve is connected to the unloading pump through the filter, the unloading pump is connected to one end of the first valve and one end of the second valve respectively, the check valve is connected in parallel to both ends of the unloading pump, and the pressure gauge is arranged between the unloading pump and the first valve;The other end of the first valve is connected to the top of the first PTMG storage tank, the other end of the second valve is connected to the top of the second PTMG storage tank, and the top of the first PTMG storage tank and the second PTMG storage tank is provided with a nitrogen inlet and a nitrogen outlet for connecting with a nitrogen system;
[0007] The bottom of the first PTMG storage tank is connected to the switch valve and the filter through a third valve; the bottom of the first PTMG storage tank is connected to the workshop through a first feeding pump and a fourth valve;
[0008] The bottom of the second PTMG storage tank is connected to a second feeding pump through a fifth valve, the second feeding pump is connected to the lower part of the second PTMG storage tank through a sixth valve, and the second feeding pump is connected to the workshop through a seventh valve.
[0009] Further, an eighth valve is further included, and the unloading pump is connected to the bottom of the first PTMG storage tank through the eighth valve.
[0010] Further, a ninth valve and a tenth valve are further included, and the lower part of the first PTMG storage tank is connected to one end of the third valve through the ninth valve and the tenth valve respectively.
[0011] Further, an eleventh valve and a twelfth valve are further included, and the lower part of the second PTMG storage tank is connected to one end of the fifth valve through the eleventh valve and the twelfth valve respectively.
[0012] Further, a thirteenth valve is arranged on the nitrogen inlet and the nitrogen outlet of the first PTMG storage tank and the second PTMG storage tank.
[0013] The PTMG unloading system for producing high-rebound polyurethane has the advantages that normal unloading is ensured, and when valve switching operation fails, PTMG can be self-circulated at the inlet and outlet of the unloading pump, so that the high pressure of the unloading pump outlet is avoided, equipment damage and production safety accidents are avoided, and the safety of the whole system is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0014] The utility model will be further explained in connection with the embodiments with reference to the drawings.
[0015] Figure 1 It is the principle view of the PTMG unloading system for producing high-rebound polyurethane of the utility model. DETAILED DESCRIPTION
[0016] Please refer to Figure 1The utility model discloses a PTMG unloading system for producing high resilience polyurethane, for connecting workshop, including joint 101, be equipped with on the joint 101 switch valve 1011, including filter 102, unloading pump 103, check valve 104, pressure gauge 105, first PTMG storage tank 106, second PTMG storage tank 107, first valve 108, second valve 109, third valve 110, first feed pump 111, fourth valve 112, fifth valve 113, second feed pump 114, sixth valve 115, seventh valve 116,
[0017] The switch valve 1011 is connected to the unloading pump 103 through the filter 102, one end of the unloading pump 103 is connected to the first valve 108 and the second valve 109 respectively, the check valve 104 is connected to both ends of the unloading pump 103 in parallel, and the pressure gauge 105 is arranged between the unloading pump 103 and the first valve 108; the other end of the first valve 108 is connected to the top of the first PTMG storage tank 106, the other end of the second valve 109 is connected to the top of the second PTMG storage tank 107, and the top of the first PTMG storage tank 106 and the second PTMG storage tank 107 is equipped with a nitrogen inlet (not shown in the figure) and a nitrogen outlet (not shown in the figure) for connecting with a nitrogen system;
[0018] The bottom of the first PTMG storage tank 106 is connected to the switch valve 1011 and the filter 102 through the third valve 110; the PTMG in the PTMG storage tank is circulated in the whole pipeline through the unloading pump 103, so that the temperature of the PTMG is ensured to be not lower than 30 DEG C, because the PTMG will solidify when being lower than 30 DEG C; and the PTMG in the first PTMG storage tank 106 is more uniform after circulation; the bottom of the first PTMG storage tank 106 is connected to the workshop through the first feed pump 111 and the fourth valve 112, and the fourteenth valve 123 is arranged between the first PTMG storage tank 106 and the first feed pump 111;
[0019] The bottom of the second PTMG storage tank 107 is connected to the second feed pump 114 through the fifth valve 113, the second feed pump 114 is connected to the lower part of the second PTMG storage tank 107 through the sixth valve 115, so that the PTMG in the second PTMG storage tank 107 is circulated, and the PTMG in the second PTMG storage tank 107 is more uniform; the second feed pump 113 is connected to the workshop through the seventh valve 116; the pressure gauge 105 can be connected to an alarm (not shown in the figure) through a pressure transmitter (not shown in the figure), and an alarm is sent when reaching a set value;
[0020] When the PTMG tank truck is connected through the joint 101, the switch valve 1011 is opened, and the PTMG in the PTMG tank truck is transported to the first PTMG storage tank 106 or the second PTMG storage tank 107 through the unloading pump 103. When the first PTMG storage tank 106 or the second PTMG storage tank 107 is full, if there is still PTMG in the PTMG tank truck, the PTMG in the PTMG tank truck will not be transported due to the pressure, and the PTMG in the pipeline will pass through the one-way check valve 104 after passing through the unloading pump 103, so that the PTMG circulates between the unloading pump 103 and the one-way check valve 104, which can prevent the safety problem of excessive pressure and ensure that the unloading pump 103 will not be damaged. In addition, the first PTMG storage tank 106 and the second PTMG storage tank 107 both have heating functions, so that the PTMG therein is not lower than 30°C.
[0021] In this embodiment, preferably, an eighth valve 117 is further included, and the unloading pump 103 is connected to the bottom of the first PTMG storage tank 106 through the eighth valve 117. The PTMG in the first PTMG storage tank 106 can be stirred similarly when the PTMG enters the first PTMG storage tank from the bottom, so that the PTMG is more uniform.
[0022] In this embodiment, preferably, a ninth valve 118 and a tenth valve 119 are further included, and the lower part of the first PTMG storage tank 106 is connected to one end of the third valve 110 through the ninth valve 118 and the tenth valve 119, respectively. When the ninth valve 118 and the tenth valve 119 are opened, the PTMG therein will not be insufficiently supplied when circulating, so that the circulation will not have problems.
[0023] In this embodiment, preferably, an eleventh valve 120 and a twelfth valve 121 are further included, and the lower part of the second PTMG storage tank 107 is connected to one end of the fifth valve 113 through the eleventh valve 120 and the twelfth valve 121, respectively. When the eleventh valve 120 and the twelfth valve 121 are opened, the PTMG will not be insufficiently supplied when circulating, so that the circulation will not have problems.
[0024] In this embodiment, preferably, a thirteenth valve 122 is arranged on the nitrogen inlet and the nitrogen outlet of the first PTMG storage tank 106 and the second PTMG storage tank 107. When the PTMG storage tank is cleaned, the thirteenth valve 122 can prevent the nitrogen from being wasted.
[0025] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0026] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that the specific examples described by us are only illustrative, and are not used to limit the scope of the utility model, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the utility model should be covered within the scope of protection of the claims of the utility model.
Claims
1. A PTMG unloading system for producing high-resilience polyurethane, used for connecting to a workshop, comprising a connector, the connector being equipped with a switching valve, characterized in that: Includes filters, unloading pumps, one-way check valves, pressure gauges, a first PTMG storage tank, a second PTMG storage tank, a first valve, a second valve, a third valve, a first feed pump, a fourth valve, a fifth valve, a second feed pump, and a sixth valve; The switching valve is connected to the unloading pump through the filter. The unloading pump is connected to one end of the first valve and one end of the second valve. The one-way check valve is connected in parallel to both ends of the unloading pump. The pressure gauge is located between the unloading pump and the first valve. The other end of the first valve is connected to the top of the first PTMG storage tank, and the other end of the second valve is connected to the top of the second PTMG storage tank. Both the first and second PTMG storage tanks are provided with nitrogen inlets and nitrogen outlets at the top for connection to a nitrogen system. The bottom of the first PTMG storage tank is connected between the switch valve and the filter via a third valve; the bottom of the first PTMG storage tank is connected to the workshop via a first feed pump and a fourth valve. The bottom of the second PTMG storage tank is connected to the second feed pump via a fifth valve, the second feed pump is connected to the lower part of the second PTMG storage tank via a sixth valve, and the second feed pump is connected to the workshop via a seventh valve.
2. The PTMG unloading system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes an eighth valve, through which the unloading pump is connected to the bottom of the first PTMG storage tank.
3. The PTMG unloading system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a ninth valve and a tenth valve, with the lower part of the first PTMG storage tank connected to one end of the third valve via the ninth valve and the tenth valve, respectively.
4. The PTMG unloading system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes an eleventh valve and a twelfth valve, with the lower part of the second PTMG tank connected to one end of the fifth valve via the eleventh valve and the twelfth valve, respectively.
5. The PTMG unloading system for producing high-resilience polyurethane as described in claim 1, characterized in that: The first PTMG storage tank and the second PTMG storage tank are each equipped with a thirteenth valve on the nitrogen inlet and nitrogen outlet.