Energy-saving pelletizing water circulation device
By introducing a combination of a small air-cooled cooling tower and a chiller unit into the pelletizing system, the problem of high cost of chilled water preparation and use was solved, energy saving and consumption reduction of the pelletizing water circulation system were achieved, and operating costs were significantly reduced.
Patent Information
- Application Number
- CN202520011767.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-03
AI Technical Summary
In the cooling process of existing polymerization pelletizing systems, the preparation and use of chilled water are costly, resulting in huge energy consumption. Therefore, an energy-saving pelletizing water circulation device is needed.
An energy-saving pelletizing water circulation device was designed, which combines a small air-cooled cooling tower with a refrigeration unit. The device uses a cooling fan and circulating water convection to reduce the temperature of pelletizing water, thereby reducing the use of expensive chilled water and providing insufficient energy to the refrigeration unit. The device includes a pelletizing water storage tank, a circulating pump, a filter, a heat exchanger, temperature and pressure sensors, and control valves.
It reduces the energy consumption and cost of the pelletizing water circulation system, saves on chilled water costs, and achieves a more economical cooling effect. Especially in the cold season, the cooling tower can replace part of the chilled water, significantly reducing the operating cost of a single pelletizing unit.
Smart Images
Figure CN223630688U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of polymerization production relates to a kind of energy-saving pelletizing water circulating device. BACKGROUND
[0002] Polymerization pelletizing system needs to be cooled to 35 ℃ from 250 ℃ instantaneously with polymer strip, so that the strip is solidified instantaneously, and the strip is cut into 2.1*2.3mm columnar particles by underwater pelletizing cutter; Therefore, a large amount of process low-temperature water is needed to cool the strip during pelletizing, which will consume a large amount of cold energy.
[0003] The current main technology is to use 6.5 ℃ chilled water and plate heat exchanger to cool and cool the pelletizing water. The chilled water is prepared by a medium-pressure chiller set, which consumes a large amount of electric energy during operation. This is because the efficient operation of the internal compressor, condenser, expansion valve and evaporator and other key components cannot be driven by continuous power. In addition, the medium-pressure chiller set also needs to use circulating cooling water to dissipate heat during operation. These components work together to prepare chilled water through the circulation of refrigerant, and each step consumes electric energy. Furthermore, the use of chilled water for cooling and cooling of the pelletizing water circulating system has high cost, and the current preparation cost of chilled water per ton is 0.75 yuan / ton. For these reasons, the traditional polymerization pelletizing system has high energy consumption and high cost. SUMMARY
[0004] The utility model provides a kind of energy-saving pelletizing water circulating device, increase the cooling tower and provide cold energy for heat exchanger, solve the problem of huge refrigeration energy consumption of original pelletizing water circulating device.
[0005] The utility model is realized as follows:
[0006] The utility model provides a kind of energy-saving pelletizing water circulating device, including pelletizing water storage tank, pelletizing water circulating pump and first filter, the pelletizing water storage tank output port is connected to pelletizing water circulating pump, and the pelletizing water circulating pump is connected to first filter;
[0007] It further includes first heat exchanger, second heat exchanger, temperature sensor, temperature control valve, pressure sensor, pressure control valve, pelletizer, second filter, cooling tower, cooling tower pump;
[0008] The first heat exchanger includes first shell layer input port, first shell layer output port, first pipe layer input port and first pipe layer output port.
[0009] The second heat exchanger includes second shell layer input port, second shell layer output port, second pipe layer input port and second pipe layer output port.
[0010] The first filter is connected to a first tube layer input port of the first heat exchanger, and a first tube layer output port of the first heat exchanger is connected to a second tube layer input port of the second heat exchanger.
[0011] The second tube layer output port of the second heat exchanger is connected to the pelletizing water storage tank input port and the pelletizer.
[0012] The temperature sensor is arranged between the second heat exchanger and the pelletizing water storage tank and close to the second tube layer output port of the second heat exchanger.
[0013] The temperature control valve is arranged at the second shell layer input port of the second heat exchanger, and the temperature sensor is electrically connected to the temperature control valve.
[0014] The pressure sensor is arranged between the second heat exchanger and the pelletizer and close to the pelletizer.
[0015] The pressure control valve is arranged between the second heat exchanger and the pelletizing water storage tank and close to the pelletizing water storage tank input port, and the pressure sensor is electrically connected to the pressure control valve.
[0016] The pelletizer is connected to the pelletizing water storage tank input port through the second filter.
[0017] The first shell layer output port of the first heat exchanger is connected to the cooling water tower, and the cooling water tower is connected to the first shell layer input port of the first heat exchanger through a cooling water pump.
[0018] Further, a refrigerator and a refrigerated water pump are further included, the refrigerator is connected to the refrigerated water pump, and the refrigerated water pump is connected to the second shell layer input port of the second heat exchanger through the temperature control valve.
[0019] Further, the refrigerator includes a refrigerated water inlet and a refrigerated water outlet, and the refrigerated water inlet and the refrigerated water outlet are arranged on the refrigerator; the refrigerated water inlet is connected to the refrigerated water pump, and the refrigerated water outlet is connected to the second shell layer output port of the second heat exchanger.
[0020] Further, the cooling water tower is a wind-cooled cooling water tower.
[0021] Further, the pelletizer further includes a spin dryer, and the spin dryer is arranged in the pelletizer.
[0022] Further, the pelletizer, the second filter and the pelletizing water storage tank are sequentially connected from top to bottom.
[0023] The advantages of the utility model lie in:
[0024] The utility model discloses a small -size air -cooled cooling water tower is separately established, can be used for the circulating production line of multiple granulator in workshop simultaneously, can utilize outdoor cold air to reduce the temperature of the granulation water, reduces the use of high -priced refrigerated water, and because the small -size cooling water tower, the cost is low, and the stable pressure and temperature supply of other cooling circulating water user ( other user still uses standard circulating cooling water 28-32 DEG C) are not affected.
[0025] The cooling and temperature reduction of the granulation water circulating device uses refrigerated water and has high cost, and the preparation cost of single ton refrigerated water is 0.75 yuan / ton at present, the utility model sets up a small -size cooling water tower, and the investment cost is low, and the cold air is used to form the cooling circulating water with the lowest temperature as far as possible by using the cooling fan in the weather temperature lower time of every year 11 to 5, the cooling circulating water and the plate heat exchanger are mainly used to reduce the temperature of the granulation water, and the insufficient energy is reduced by the refrigerated water provided by the refrigerating unit.
[0026] The work load of single granulation water circulating device is 95t / h, and the granulation water temperature needs to be reduced from 30 DEG C to 16 DEG C, and the temperature is reduced to 20 DEG C at 30 DEG C ( because the cooling water temperature cannot be used to cool to the set temperature, and the remaining temperature difference is reduced by refrigerated water), the circulating cooling water temperature can be reduced to 18 DEG C ( taking the intermediate value) in winter and spring, and the working temperature is 18 DEG C to 25 DEG C when granulating, and the working temperature of the refrigerating unit is 6.5 DEG C-11.5 DEG C.
[0027] If single granulation device uses refrigerated water entirely, the cost of reducing temperature 10 DEG C is: 95t / h granulation water flow * 4.18 granulation water specific heat capacity * (30-20) granulation water temperature difference / 4.2 refrigerated water specific heat capacity / (11.5-6.5) refrigerated water temperature difference * 0.75 refrigerated water unit price = 141.8 yuan / hour, if single granulation device uses cooling circulating water to reduce temperature partially, the cost of reducing temperature 10 DEG C is: 95t / h granulation water flow * 4.18 granulation water specific heat capacity * (30-20) granulation water temperature difference / 4.18 cooling circulating water specific heat capacity / (25-18) cooling water temperature difference * 0.2 cooling water unit price = 27.1 yuan / hour, one workshop supposes 3 production lines, suppose that 5 months can use cooling water to replace part of refrigerated water every year, then the cost is saved about (141.8-27.1) * 3 * 24 * 30 * 5 = 1.239 million / year every year. BRIEF DESCRIPTION OF DRAWINGS
[0028] The utility model will be further described below in combination with embodiments with reference to the drawings.
[0029] Figure 1 It is the structural schematic diagram of the utility model device. PREFERRED EMBODIMENT
[0030] The technical problem to be solved by this utility model is to provide an energy-saving pelletizing water circulation device, which solves the problem of huge energy consumption for cooling in the original pelletizing water circulation device.
[0031] Example 1
[0032] This embodiment provides an energy-saving pelletizing water circulation device, such as... Figure 1 As shown, it includes a pelletized water storage tank 1, a pelletized water circulation pump 2, and a first filter 3;
[0033] The output port of the pellet water storage tank 1 is connected to the pellet water circulation pump 2, and the pellet water circulation pump 2 is connected to the first filter 3.
[0034] It also includes a first heat exchanger 4, a second heat exchanger 5, a temperature sensor 6, a temperature control valve 7, a pressure control valve 8, a pressure sensor 9, a pelletizer 10, a second filter 11, a chiller 12, a chilled water pump 13, a cooling tower 14, and a cooling water pump 15.
[0035] The first heat exchanger 4 includes a first shell inlet port 401, a first shell outlet port 402, a first tube inlet port 403, and a first tube outlet port 404.
[0036] The second heat exchanger 5 includes a second shell inlet port 501, a second shell outlet port 502, a second tube inlet port 503, and a second tube outlet port 504.
[0037] The cooling tower 15 is an air-cooled cooling tower, installed outdoors, and its size is determined by the number of pelletizers used and the size of the pelletizers.
[0038] The first filter 3 is connected to the first tube layer inlet port 403 of the first heat exchanger 4, and the first tube layer outlet port 404 of the first heat exchanger 4 is connected to the first tube layer inlet port 503 of the second heat exchanger 5.
[0039] The second tube layer output port 504 of the second heat exchanger 5 is connected to the input port of the pelletizing water storage tank 1 and the pelletizer 10;
[0040] The temperature sensor 6 is located between the second heat exchanger 5 and the pelletized water storage tank 1, and is close to the second tube layer output port 504 of the second heat exchanger 5.
[0041] The temperature control valve 7 is located at the second shell input port 501 of the second heat exchanger 5, and the temperature sensor 6 is electrically connected to the temperature control valve 7.
[0042] The pressure sensor 9 is located between the second heat exchanger and the pelletizer, and is close to the pelletizer;
[0043] The pressure control valve 8 is arranged between the second heat exchanger 5 and the pelletizing water storage tank 1 and is close to the input port of the pelletizing water storage tank 1, and the pressure sensor 9 is electrically connected to the pressure control valve 8.
[0044] The temperature control valve 7 and the pressure control valve 8 are electrically controlled valves and can be directly purchased on the market. The temperature sensor 6 is used to detect the temperature to control the temperature control valve 7, and the pressure sensor 9 is used to detect the pressure to control the pressure control valve 8.
[0045] The pelletizing machine 10 further comprises a spin dryer 1001 arranged inside the pelletizing machine 10.
[0046] The pelletizing machine 10 is connected to the input port of the pelletizing water storage tank 1 through the second filter 11.
[0047] The pelletizing machine 10, the second filter 11 and the pelletizing water storage tank 1 are sequentially connected from top to bottom, and the pelletizing water naturally falls from the pelletizing machine 10 to the second filter 11 and then enters the pelletizing water storage tank 1 by gravity.
[0048] The chiller 12 is connected to a chilled water pump 13, and the chilled water pump 13 is connected to the second shell input port 501 of the second heat exchanger through the temperature control valve 7.
[0049] The chiller 12 comprises a chilled water inlet 1201 and a chilled water return port 1202.
[0050] The chilled water inlet 1201 and the chilled water return port 1202 are arranged on the chiller 12.
[0051] The chilled water inlet 1201 is connected to the chilled water pump 13, and the chilled water return port 1202 is connected to the second shell output port 502 of the second heat exchanger.
[0052] The first shell output port 402 of the first heat exchanger is connected to a cooling tower 14, and the cooling tower 14 is connected to the first shell input port 401 of the first heat exchanger through a cooling water pump 15.
[0053] When the pelletizing device is operated, the pelletizing water storage tank 1 is used to store circulating pelletizing water for continuous circulation.
[0054] The pelletizing water in the pelletizing water storage tank 1 is delivered to the first filter 3 through the pelletizing water delivery pump 2, and the impurities and suspended matters in the filtered water in the first filter 3 are filtered to ensure the water quality is clean and reduce the pollution to the pelletizing machine equipment.
[0055] The filtered pelletizing water is first passed through the first heat exchanger 4, and the circulating cooling water cooled by the cooling fan of the cooling tower 14 is used to cool the pelletizing water in the first cooling.
[0056] In winter, the first heat exchanger 4 can basically take away most of the heat in the cutting water, and then the cutting water enters the second heat exchanger 5, and the cutting water temperature is controlled to be stable at 16 DEG C.
[0057] The cutting water cooled to the required temperature is stably provided to the cutting machine after being stably controlled to a certain pressure by the pressure control valve 8, for conveying the polymer strip, strip spray cooling and conveying the cut particles.
[0058] The particle slices enter the downstream equipment after passing through the spin dryer 1001, and the cutting water flows to the second filter 11 by gravity after passing through the spin dryer 1001, and the cutting water flows to the cutting water storage tank 1 after filtering out the carried broken slices and impurities, so that the cutting water is continuously circulated to avoid waste, and the first heat exchanger 4 and the second heat exchanger 5 continuously cool the cutting water.
[0059] The cooling tower 14 can also provide cooling water for other cutting water circulating production devices of the same device, and the other cutting water circulating production devices can be connected to the cooling tower 14 through positions 16 and 17 shown in the figure, and the cooling water supplied by the cooling tower 14 is recycled back to the first heat exchanger 4.
[0060] 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, therefore it cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0061] The above embodiments and drawings are not limited to the product form and style of the utility model, and any appropriate changes or modifications made by ordinary skilled persons in the art shall be considered as not departing from the patent scope of the utility model.
Claims
1. An energy-saving pelletizing water circulating device, comprising a pelletizing water storage tank, a pelletizing water circulating pump and a first filter, wherein the output port of the pelletizing water storage tank is connected to the pelletizing water circulating pump, and the pelletizing water circulating pump is connected to the first filter; characterized in that further comprising a first heat exchanger, a second heat exchanger, a temperature sensor, a temperature control valve, a pressure sensor, a pressure control valve, a pelletizer, a second filter, a cooling tower and a cooling water pump; the first heat exchanger comprises a first shell layer input port, a first shell layer output port, a first tube layer input port and a first tube layer output port; the second heat exchanger comprises a second shell layer input port, a second shell layer output port, a second tube layer input port and a second tube layer output port; the first filter is connected to the first tube layer input port of the first heat exchanger, and the first tube layer output port of the first heat exchanger is connected to the second tube layer input port of the second heat exchanger; the second tube layer output port of the second heat exchanger is connected to the input port of the pelletizing water storage tank and the pelletizer; the temperature sensor is arranged between the second heat exchanger and the pelletizing water storage tank, and is close to the second tube layer output port of the second heat exchanger; the temperature control valve is arranged at the second shell layer input port of the second heat exchanger, and the temperature sensor is electrically connected to the temperature control valve; the pressure sensor is arranged between the second heat exchanger and the pelletizer, and is close to the pelletizer; the pressure control valve is arranged between the second heat exchanger and the pelletizing water storage tank, and is close to the input port of the pelletizing water storage tank, and the pressure sensor is electrically connected to the pressure control valve; the pelletizer is connected to the input port of the pelletizing water storage tank through the second filter; the first shell layer output port of the first heat exchanger is connected to the cooling tower, and the cooling tower is connected to the first shell layer input port of the first heat exchanger through the cooling water pump.
2. The energy saving water recycling pelletizing device of claim 1, wherein, further comprising a refrigerator and a refrigerated water pump, wherein the refrigerator is connected to the refrigerated water pump, and the refrigerated water pump is connected to the second shell layer input port of the second heat exchanger through the temperature control valve.
3. An energy saving water circulating pellet cutting device as claimed in claim 2, wherein, the refrigerator comprises a refrigerated water inlet and a refrigerated water outlet, and the refrigerated water inlet and the refrigerated water outlet are arranged on the refrigerator; the refrigerated water inlet is connected to the refrigerated water pump, and the refrigerated water outlet is connected to the second shell layer output port of the second heat exchanger.
4. The energy saving water recycling pelletizing device of claim 1, wherein, the cooling tower is a wind-cooled cooling tower.
5. The energy saving water recycling pelletizing device of claim 1, wherein, the pelletizer further comprises a spin dryer, and the spin dryer is arranged in the pelletizer.
6. An energy saving water circulating pelletizing device as claimed in claim 1, wherein, the pelletizer, the second filter and the pelletizing water storage tank are sequentially connected from top to bottom.