Production-increasing and energy-saving device of first esterification kettle

Abstract

The utility model relates to a first esterification kettle yield increasing and energy saving device which comprises a primary heating medium oil supply pipeline and a primary heating medium oil return pipeline, a temperature sensor I and a temperature sensor II are installed on the primary heating medium oil supply pipeline, and a temperature sensor III is installed in a reaction kettle. A secondary heating medium oil supply pipeline is connected between the primary heating medium oil return pipeline and the primary heating medium oil supply pipeline, a circulating oil pump is connected to the secondary heating medium oil supply pipeline, an inlet valve and an outlet valve are installed on the secondary heating medium oil supply pipeline, and the secondary heating medium oil supply pipeline is connected with the primary heating medium oil supply pipeline through a first pipeline in front of the inlet valve. The secondary heating medium oil supply pipeline is connected with the primary heating medium oil supply pipeline through a second pipeline in front of the outlet valve, and the second pipeline is provided with a second valve. The secondary heating medium can be utilized, the circulation flow of the heating medium can be increased, or the circulation flow of the primary heating medium can be directly increased, the temperature of a heating medium outlet of a header pipe can be reduced, the pressure of a header oil supply pipe can be reduced, and energy conservation and consumption reduction can be realized by reducing the number of circulating oil pumps and adjusting the service power.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat conducting oil system technical field, concretely relates to a first esterification kettle production increasing and energy saving device. BACKGROUND

[0002] The heat conducting oil heating system is a closed loop circulating system taking heat conducting oil as medium, delivering the heated heat conducting oil to the heat using equipment through the circulating pump, and returning to the heating equipment for re-heating.

[0003] In the production of polyester, the original first esterification kettle control mode is to control the valve of the primary heat medium by the material temperature, only to adjust the flow of the primary heat medium, which is related to the primary heat medium pressure supplied by the boiler, and in order to ensure the normal production of polyester or to increase the yield, the primary heat medium oil supply temperature needs to be increased, which increases the energy consumption. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a first esterification kettle production increasing and energy saving device, which can utilize the secondary heat medium of the first esterification kettle, increase the heat medium circulating flow of the first esterification kettle, or directly increase the primary heat medium circulating amount of the first esterification kettle, so as to reduce the total oil supply pipe pressure, improve the production efficiency of the first esterification kettle, reduce the heat medium temperature, and save energy and reduce consumption.

[0005] The utility model is realized through the following technical schemes:

[0006] The utility model provides a first esterification kettle production increasing and energy saving device, which comprises a primary heat medium oil supply pipeline and a primary heat medium oil return pipeline connected with a reaction kettle respectively, a temperature sensor I is installed on the primary heat medium oil supply pipeline at the inlet of the reaction kettle, a temperature sensor II is installed on the primary heat medium oil return pipeline at the outlet of the reaction kettle, a temperature sensor III is installed in the reaction kettle, a secondary heat medium oil supply pipeline is connected between the primary heat medium oil return pipeline and the primary heat medium oil supply pipeline, a circulating oil pump is connected on the secondary heat medium oil supply pipeline, an inlet valve and an outlet valve are respectively installed before the inlet of the circulating oil pump and after the outlet of the circulating oil pump, a pressure gauge is further installed on the secondary heat medium oil supply pipeline between the circulating oil pump and the outlet valve, the secondary heat medium oil supply pipeline is connected with the primary heat medium oil supply pipeline through a first pipeline before the inlet valve, a flow sensor and a first valve are respectively installed on the first pipeline, the secondary heat medium oil supply pipeline is connected with the primary heat medium oil supply pipeline through a second pipeline before the outlet valve, and a second valve is installed on the second pipeline.

[0007] Further, a bypass pipeline is further connected in parallel on the primary heat medium oil supply pipeline, a bypass valve is installed on the bypass pipeline, a pneumatic regulating valve is installed on a section of the primary heat medium oil supply pipeline connected in parallel with the bypass pipeline, and a third valve and a fourth valve are respectively installed on the two sides of the pneumatic regulating valve.

[0008] Further, the circulation pipeline is connected between the primary heat medium oil supply pipeline and the first pipeline between the fourth valve and the pneumatic regulating valve.

[0009] Further, the PLC controller is electrically connected with the motor frequency control module of the circulation oil pump, the pneumatic regulating valve, the pressure gauge, the temperature sensor I, the temperature sensor II and the temperature sensor III.

[0010] The utility model discloses beneficial effects:

[0011] The utility model discloses can mix first esterification kettle heat -conducting oil return oil (secondary heat medium) with heat -conducting oil supply (primary heat medium), utilize primary heat medium pressure of first esterification kettle material temperature control, improve first esterification kettle flow, reach the purpose of increasing efficiency, increasing yield, in addition, the system can also be used as single pressurization system, can mix use primary heat medium and secondary heat medium, can also be used as pressurization system only, when the heat medium flow increases, the whole set of polyester device can reduce primary heat medium temperature according to the production requirement of first esterification kettle, reaches the effect of energy -conserving, increasing yield, increasing efficiency. If it is two circulating pumps, one can be stopped, if it is one circulating pump, the use power of secondary heat medium circulating pump can be reduced, reaches the purpose of improving production efficiency, reducing heat medium temperature, energy -conserving and loss -reducing.

[0012] The utility model discloses can select different heat supply mode according to boiler load, flow, pressure, pressure difference and production load, reduces primary heat medium oil supply temperature, energy -conserving, reduces system working pressure difference, reduces heat -conducting oil supply pressure, reaches the purpose of saving power consumption through reducing oil pump lift, optimizes first esterification kettle temperature control in the kettle, accurate temperature control, stable production, the secondary circulation system of original three pumps is changed into one pump operation, reaches the purpose of saving power consumption more than 50%. ACCURATE DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic diagram of the utility model.

[0014] As shown in the drawings:

[0015] 1, the reaction kettle, 2, primary heat medium oil supply pipeline, 3, primary heat medium return oil pipeline, 4, temperature sensor I, 5, temperature sensor II, 6, temperature sensor III, 7, secondary heat medium oil supply pipeline, 8, circulation oil pump, 9, inlet valve, 10, outlet valve, 11, pressure gauge, 12, first pipeline, 13, flow sensor, 14, first valve, 15, second pipeline, 16, second valve, 17, bypass pipeline, 18, bypass valve, 19, pneumatic regulating valve, 20, bypass valve, 21, fourth valve, 22, circulation pipeline, 23, fifth valve. CONCRETE IMPLEMENTATION

[0016] In order to clearly illustrate the technical features of the scheme, the scheme is described below through specific embodiments.

[0017] The utility model provides a first esterification cauldron raises yield energy - saving device, specifically first esterification cauldron of polyethylene terephthalate PET, including with reaction cauldron 1 connects's primary heat medium oil supply line 2 and primary heat medium back oil line 3, primary heat medium oil supply line 2 installs temperature sensor I 4 at the import of reaction cauldron 1, primary heat medium back oil line 3 installs temperature sensor II 5 at the export of reaction cauldron 1, installs temperature sensor III 6 in reaction cauldron, primary heat medium back oil line 3 is connected with primary heat medium oil supply line 2 between second heat medium oil supply line 7, second heat medium oil supply line 7 is connected with circulating oil pump 8, and installs inlet valve 9 and outlet valve 10 respectively before the import and after the export of circulating oil pump 8, still installs pressure gauge 11 on second heat medium oil supply line 7 between circulating oil pump 8 and outlet valve 10, second heat medium oil supply line 4 is connected with primary heat medium oil supply line 2 through first pipeline 12 before inlet valve 9, installs flow sensor 13 and first valve 14 respectively on first pipeline 12, second heat medium oil supply line 4 is connected with primary heat medium oil supply line 2 through second pipeline 15 before outlet valve 10, installs second valve 16 on second pipeline 15.

[0018] Still parallelly connected with bypass pipeline 17 on primary heat medium oil supply line 2, installs bypass valve 18 on bypass pipeline 17, installs pneumatic regulating valve 19 on the parallel section of primary heat medium oil supply line 2 and bypass pipeline 17, and installs third valve 20 and fourth valve 21 respectively on the both sides of pneumatic regulating valve 19.

[0019] Connects circulating pipeline 22 between primary heat medium oil supply line 2 and first pipeline 12 between pneumatic regulating valve 19 and fourth valve 21, installs fifth valve 23 on circulating pipeline 22.

[0020] Still include PLC controller, and PLC controller is electrically connected with motor frequency control module of circulating oil pump 8, pneumatic regulating valve 19, pressure gauge 11, temperature sensor I 4, temperature sensor II 5 and temperature sensor III 6 respectively.

[0021] Through first esterification cauldron material temperature control heat medium oil supply pressure, guarantee production. Utilize first esterification cauldron secondary heat medium and primary heat medium mix, improve first esterification cauldron heat medium flow, raise yield energy - saving. Can restore original heating mode, use pneumatic regulating valve 19 to control heat medium, ensure normal production. When boiler load has margin, can use circulating oil pump 8 as pipeline pump, extracts primary heat medium, improves first esterification cauldron heat medium circulation flow. PLC controller can control heat medium oil supply pressure through first esterification cauldron material temperature, guarantee production, can control regulating valve opening degree through primary heat medium temperature, can realize frequency conversion control of heat conducting oil circulating pump.

[0022] The utility model discloses a first esterification kettle sets up circulation, and utilizes first esterification kettle material temperature control circulating oil pump 8's export pressure and circulating oil pump 8's motor frequency and pneumatic control valve 19 opening degree, can reduce system temperature and reduce the total pipe pressure difference, reduce circulating oil pump 8 power consumption, realize the purpose of energy saving, increasing production.

[0023] The first esterification kettle production energy-saving device has the following three working modes:

[0024] Mode one: pressure increasing and flow increasing.

[0025] According to the size of the opening degree of the primary heat medium bypass valve 18, it is determined whether to close the secondary heat medium oil supply pipeline 7 and the pneumatic control valve 19, and the circulating oil pump 8 is used to extract the primary heat medium, the heat medium flow of the first esterification kettle is increased, the temperature in the reaction kettle is monitored by the temperature sensor III 6, the frequency of the circulating oil pump 8 is controlled by the PLC controller, the production is stabilized, the flow is increased, the temperature of the primary heat medium is appropriately reduced, the frequency of the circulating oil pump 8 is increased, when the circulating oil pump 8 is full-frequency operation, the primary heat medium oil supply temperature can be reduced by 3-8 DEG C, and about 2% of energy can be saved.

[0026] Mode two: internal circulation flow increasing.

[0027] The secondary heat medium oil supply pipeline 7 is opened, the oil supply temperature is monitored by the temperature sensor I 4, and the temperature in the reaction kettle 1 is monitored by the temperature sensor III 6, the opening degree of the pneumatic control valve 19 is controlled by the PLC controller, the pressure at the outlet of the circulating oil pump 8 is monitored by the pressure gauge 11, and the working frequency of the circulating oil pump 8 is adjusted accordingly, the reaction kettle 1 is supplied with constant temperature and constant pressure oil, the first esterification kettle is ensured to be normally produced, the opening degree of the pneumatic control valve is adjusted, the flow of the primary heat medium is reduced, and energy saving and consumption reduction are realized.

[0028] Mode three: boiler direct supply and internal circulation device is stopped.

[0029] According to the production load, when the load is reduced, mode two is stopped, the primary heat medium of the boiler is directly supplied, the pneumatic control valve 19 and the bypass flow adjusting valve are used to control the temperature of the reaction kettle 1.

[0030] When installing and using, different user production conditions are selected according to different user production conditions, the threshold temperature of the temperature sensor and the pressure threshold of the pressure gauge 11 are configured, the temperature of the primary heat medium of the boiler is reduced, and energy consumption is reduced.

[0031] Of course, the above description is also not limited to the above examples, the technical features not described in the utility model can be realized by or using the prior art, which will not be repeated here; the above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not a limitation on the utility model, the utility model has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A first esterification kettle production increase and energy saving device, comprising a primary heat medium oil supply line and a primary heat medium oil return line connected with a reaction kettle respectively, a temperature sensor I is installed at the inlet of the reaction kettle on the primary heat medium oil supply line, a temperature sensor II is installed at the outlet of the reaction kettle on the primary heat medium oil return line, and a temperature sensor III is installed in the reaction kettle, characterized in that: The secondary heat medium oil supply pipeline is connected between the primary heat medium oil return pipeline and the primary heat medium oil supply pipeline, a circulating oil pump is connected to the secondary heat medium oil supply pipeline, an inlet valve and an outlet valve are respectively installed before the inlet of the circulating oil pump and after the outlet of the circulating oil pump, a pressure gauge is further installed on the secondary heat medium oil supply pipeline between the circulating oil pump and the outlet valve, the secondary heat medium oil supply pipeline is connected to the primary heat medium oil supply pipeline through a first pipeline before the inlet valve, the first pipeline is respectively provided with a flow sensor and a first valve, and the secondary heat medium oil supply pipeline is connected to the primary heat medium oil supply pipeline through a second pipeline before the outlet valve, and the second pipeline is provided with a second valve. ​ 2. The first esterification still yield-enhancing energy-saving device according to claim 1, characterized in that: The primary heat medium oil supply pipeline is further connected in parallel with a bypass pipeline, the bypass pipeline is provided with a bypass valve, a pneumatic regulating valve is installed on a section of the primary heat medium oil supply pipeline connected in parallel with the bypass pipeline, and a third valve and a fourth valve are respectively installed on the two sides of the pneumatic regulating valve.

3. The first esterification still yield-enhancing energy-saving device according to claim 2, characterized in that: A circulating pipeline is connected between the primary heat medium oil supply pipeline connected between the pneumatic regulating valve and the fourth valve and the first pipeline, and the circulating pipeline is provided with a fifth valve.

4. The first esterification still yield-enhancing energy-saving device according to claim 3, characterized in that: The PLC controller is electrically connected with a motor frequency control module of the circulating oil pump, the pneumatic regulating valve, the pressure gauge, temperature sensor I, temperature sensor II and temperature sensor III.

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