Air cooler and waste heat refrigeration plate heat exchanger combined system

Abstract

The utility model belongs to the technical field of polyester production, and relates to an air cooler and waste heat refrigeration plate heat exchanger combined system which comprises a high-temperature steam conveying pipe, a condensate discharge pipe, an air cooler, a waste heat refrigeration pipe and a waste heat refrigeration plate heat exchanger. The air cooler is a fan tube bundle type air cooler, and the fan tube bundle type air cooler comprises a cooling box main body, a partition plate I, a partition plate II, a tube bundle and a fan; a through hole IV is formed in the side surface of the cooling box main body; one end of the waste heat refrigeration pipe is connected with the space I through a through hole IV, and the other end of the waste heat refrigeration pipe is connected with the waste heat refrigeration plate heat exchanger; an inlet and an outlet are formed in the cooling box main body, the inlet is used for communicating a high-temperature steam conveying pipe with the space I, and the outlet is used for communicating the space III with a condensate discharge pipe; and the fan is used for cooling the cooling box main body, so that the high-temperature steam is condensed into condensate. Combination of the air cooler and the waste heat refrigeration plate heat exchanger is achieved, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of polyester production technology and relates to a combined system of an air cooler and a waste heat cooling plate heat exchanger. Background Technology

[0002] In the production of purified polyethylene terephthalate (PET), the process tower separates the EG (ethylene glycol) and byproducts generated by the esterification system. Therefore, a large amount of high-temperature steam is generated at the top of the tower, which enters an air cooler for collection and cooling. An air cooler is a device that cools the gas, causing the moisture it contains to condense and be removed. In polyester processes, fan-tube bundle type air coolers are used for gas cooling.

[0003] like Figure 1 , Figure 3 As shown, the fan-tube bundle air cooler includes a plug, a cooling box body 6, baffles I 7 and II 8, a tube bundle, and a fan; the cooling box body 6 is a hollow cubic structure; baffles I 7 and II 8 are located inside the cooling box body 6, dividing the interior of the cooling box body 6 into three sealed spaces from left to right, denoted as space I, space II, and space III respectively; baffle I 7 has a through hole I, and baffle II... 8 is provided with a through hole II; the tube bundle 9 includes two or more hollow tubes, which are placed horizontally and pass through through holes I and II in sequence, so that space I is connected to space III through the hollow tubes; the number of through holes I, through holes II and hollow tubes is the same; the side of the cooling box body 6 is provided with multiple through holes III, which connect to the outside and space I; the plug is detachably fixed to the through holes III; the inlet of the fan tube bundle air cooler is located on the upper surface of the cooling box body 6; the inlet of the fan tube bundle air cooler connects to the outside and space I; the outlet of the fan tube bundle air cooler is located on the lower surface of the cooling box body; the outlet of the fan tube bundle air cooler connects to space III and the outside; the fan 10 is located below the cooling box body 6 and is used to cool the cooling box body 6, thereby condensing high-temperature steam into condensate. The high-temperature steam transmission pipe includes a high-temperature steam transmission main pipe 1, a high-temperature steam transmission transition pipe 2, and multiple high-temperature steam transmission branch pipes 3; the inlet of the fan tube bundle air cooler is connected to the high-temperature steam transmission branch pipe 3, and the outlet of the fan tube bundle air cooler is connected to the condensate discharge pipe 4; wherein, the high-temperature steam transmission branch pipe 3 is equipped with valve III 13, and the condensate discharge pipe 4 is equipped with valve I11.

[0004] However, directly cooling high-temperature steam into condensate and then discharging it wastes resources. Therefore, introducing a waste heat refrigeration system to collect and utilize high-temperature steam can save energy and reduce consumption.

[0005] Patent publication number CN104314789A discloses a waste heat recovery system for centrifugal air compressors. This system achieves heat exchange and waste heat recovery by tightly connecting pipes that transport hot air and pipes that transport cold water. However, this method cannot be applied to polyester processes because the high-temperature steam transport pipes in polyester processes are insulated, preventing heat exchange between the high-temperature steam inside the pipes and the outside cold air. This prevents premature condensation, and the condensate easily drips back into the process tower, adversely affecting the reactions within the tower.

[0006] Therefore, it is of great significance to study a combined system of an air cooler and a waste heat refrigeration plate heat exchanger to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to solve the problems existing in the prior art and to provide a system that combines a polyester air cooler with a waste heat refrigeration plate heat exchanger.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A system combining an air cooler and a waste heat refrigeration plate heat exchanger includes a high-temperature steam delivery pipe, a condensate discharge pipe, an air cooler, a waste heat refrigeration pipe, and a waste heat refrigeration plate heat exchanger.

[0010] The air cooler is a fan tube bundle type air cooler, which includes a cooling box body, partition I, partition II, tube bundle and fan;

[0011] The main body of the cooling box is a hollow cubic structure; partition I and partition II are located inside the main body of the cooling box, dividing the interior of the main body of the cooling box into three sealed spaces from left to right, which are respectively referred to as space I, space II and space III; partition I has a through hole I and partition II has a through hole II; the tube bundle includes two or more hollow tubes, which are placed horizontally and pass through through holes I and II in sequence, so that space I is connected to space III through the hollow tubes;

[0012] The cooling box body has a through hole IV on its side; one end of the waste heat refrigeration pipe is connected to space I through through hole IV, and the other end of the waste heat refrigeration pipe is connected to the waste heat refrigeration plate heat exchanger; the cooling box body has an inlet and an outlet, the inlet is used to connect the high-temperature steam conveying pipe and space I, and the outlet is used to connect space III and condensate discharge pipe; the fan is used to cool the cooling box body, thereby condensing the high-temperature steam into condensate; the cross-sectional area of ​​the inlet on the cooling box body is the same as the cross-sectional area of ​​through hole IV; valve I is provided on the condensate discharge pipe, and valve II is provided on the waste heat refrigeration pipe.

[0013] This application replaces the side plate with a plug in the existing fan tube bundle air cooler with the plate with only through hole IV in this application. By using a waste heat refrigeration pipe, one end of the waste heat refrigeration pipe is connected to space I through through hole IV, and the other end of the waste heat refrigeration pipe is connected to a waste heat refrigeration plate heat exchanger, thereby realizing the combined use of the air cooler and the waste heat refrigeration plate heat exchanger. When heat exchange is not required, valve II is closed, valve I is opened, and the fan is turned on, so that high-temperature steam is condensed through the fan tube bundle air cooler and then discharged through the condensate discharge pipe. When heat exchange is required, valve I is closed, the fan is turned off, and valve II is opened, so that high-temperature steam enters space I and then enters the waste heat refrigeration plate heat exchanger through the waste heat refrigeration pipe.

[0014] In the prior art, the plug is used to facilitate cleaning of the tube bundle. However, when applied to the polyester process, since the input to the fan tube bundle air cooler is high-temperature steam, the main component of which is water, the design of the plug is redundant in this field. The reason for replacing the side plate with the plug with the plate with only through hole IV in this application is that the cross-sectional area of ​​the through hole III corresponding to the plug in the prior art is much smaller than the cross-sectional area of ​​the inlet. This causes a mismatch between the flow rate of high-temperature steam in the input space I and the flow rate of steam entering the waste heat refrigeration tube in the output space I.

[0015] As a preferred technical solution:

[0016] As described above, in a combined air cooler and waste heat refrigeration plate heat exchanger system, there are multiple through holes I, and the number of through holes I, through holes II, and hollow tubes are the same.

[0017] In the air cooler and waste heat refrigeration plate heat exchanger combined system described above, the fan is located below the main body of the cooling box.

[0018] As described above, in a system combining an air cooler and a waste heat refrigeration plate heat exchanger, valve III is installed on the high-temperature steam delivery pipe to control the flow rate of the high-temperature steam.

[0019] As described above, in a system combining an air cooler and a waste heat refrigeration plate heat exchanger, there are multiple fan tube bundle air coolers.

[0020] As described above, an air cooler combined with a waste heat refrigeration plate heat exchanger system includes a high-temperature steam delivery pipe comprising a high-temperature steam delivery main pipe, a high-temperature steam delivery transition pipe, and multiple high-temperature steam delivery branch pipes. The high-temperature steam delivery transition pipe is a hollow cylinder sealed at both ends. A through-hole V and multiple through-holes VI are provided on the circumference of the high-temperature steam delivery transition pipe. The high-temperature steam delivery main pipe is connected to the through-hole V. The number of through-holes VI and the number of high-temperature steam delivery branch pipes are the same as the number of fan-tube bundle air coolers. One end of each of the multiple high-temperature steam delivery branch pipes is connected to a through-hole VI, and the other end is connected to the inlet of a fan-tube bundle air cooler. The number of valves III is the same as the number of high-temperature steam delivery branch pipes, and valves III are installed on the high-temperature steam delivery branch pipes in a one-to-one correspondence.

[0021] As described above, an air cooler and a waste heat refrigeration plate heat exchanger are used together. The waste heat refrigeration pipe includes a waste heat refrigeration main pipe and multiple waste heat refrigeration branch pipes. The waste heat refrigeration main pipe is a hollow cylinder with one end closed. The open end of the waste heat refrigeration main pipe is connected to the waste heat refrigeration plate heat exchanger. Multiple through holes VII are provided on the circumferential surface of the waste heat refrigeration main pipe.

[0022] The number of through holes VII and the number of waste heat cooling branch pipes are the same as the number of fan tube bundle air coolers; one end of each of the multiple waste heat cooling branch pipes is connected to a through hole IV, and the other end is connected to a through hole VII.

[0023] The number of valves II is the same as the number of waste heat refrigeration branch pipes. Valves II are installed on the waste heat refrigeration branch pipes and correspond one-to-one.

[0024] Beneficial effects:

[0025] (1) The present invention provides a system for the combined use of an air cooler and a waste heat refrigeration plate heat exchanger. The side plate with a plug in the existing fan tube bundle air cooler is replaced with the plate with only through hole IV in this application. By using a waste heat refrigeration pipe, one end of the waste heat refrigeration pipe is connected to space I through through hole IV, and the other end of the waste heat refrigeration pipe is connected to the waste heat refrigeration plate heat exchanger, thereby realizing the combined use of the air cooler and the waste heat refrigeration plate heat exchanger.

[0026] (2) The present invention provides a system for the combined use of an air cooler and a waste heat refrigeration plate heat exchanger, which introduces a waste heat refrigeration system to collect and utilize high-temperature steam, thereby saving energy and reducing consumption. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of an existing air cooler.

[0028] Figure 2 This is a cross-sectional view of the air cooler and waste heat refrigeration plate heat exchanger combined system of the present invention;

[0029] Figure 3 Side view of a conventional air cooler;

[0030] Figure 4 This is a front view of the air cooler and waste heat refrigeration plate heat exchanger combined system of the present invention;

[0031] Among them, 1-high temperature steam transmission main pipe, 2-high temperature steam transmission transition pipe, 3-high temperature steam transmission branch pipe, 4-condensate discharge pipe, 5-fan tube bundle air cooler, 6-cooling box body, 7-partition I, 8-partition II, 9-tube bundle, 10-fan, 11-valve I, 12-valve II, 13-valve III, 14-waste heat refrigeration main pipe, 15-waste heat refrigeration branch pipe, 16-waste heat refrigeration plate heat exchanger. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0033] A system combining an air cooler and a waste heat refrigeration plate heat exchanger, such as Figure 2 , Figure 4 As shown, it includes a high-temperature steam conveying pipe, a condensate discharge pipe 4, an air cooler, a waste heat refrigeration pipe, and a waste heat refrigeration plate heat exchanger 16.

[0034] The air cooler is a fan tube bundle type air cooler 5, and there are multiple fan tube bundle type air coolers 5; the fan tube bundle type air cooler 5 includes a cooling box body 6, partition I 7, partition II 8, tube bundle 9 and fan 10;

[0035] The cooling box body 6 is a hollow cubic structure; partition I 7 and partition II 8 are located inside the cooling box body 6, dividing the interior of the cooling box body 6 into 3 sealed spaces from left to right, which are respectively denoted as space I, space II and space III; partition I 7 is provided with through hole I, and partition II 8 is provided with through hole II; tube bundle 9 includes two or more hollow tubes, which are placed horizontally and pass through through hole I and through hole II in sequence, so that space I is connected to space III through the hollow tubes;

[0036] There are multiple through holes I, and the number of through holes I, through holes II, and hollow tubes are the same.

[0037] The cooling box body 6 has a through hole IV on its side, which communicates with space I; the cooling box body 6 has an inlet and an outlet, the inlet communicates with space I, and the outlet is used to connect space III and condensate discharge pipe 4; the fan 10 is located below the cooling box body 6, and the fan 10 is used to cool the cooling box body 6, thereby condensing high-temperature steam into condensate; the cross-sectional area of ​​the inlet on the cooling box body 6 is the same as the cross-sectional area of ​​the through hole IV; the condensate discharge pipe 4 is equipped with valve I;

[0038] The high-temperature steam transmission pipe includes a high-temperature steam transmission main pipe 1, a high-temperature steam transmission transition pipe 2, and multiple high-temperature steam transmission branch pipes 3. The high-temperature steam transmission transition pipe 2 is a hollow cylinder sealed at both ends. A through hole V and multiple through holes VI are provided on the circumference of the high-temperature steam transmission transition pipe 2. The high-temperature steam transmission main pipe 1 is connected to the through hole V. The number of through holes VI and the number of high-temperature steam transmission branch pipes 3 are the same as the number of fan tube bundle air coolers 5. One end of each of the multiple high-temperature steam transmission branch pipes 3 is connected to a through hole VI, and the other end is connected to the inlet of a fan tube bundle air cooler 5. Valves III 13 are provided on the high-temperature steam transmission branch pipes 3, and the number of valves III 13 is the same as the number of high-temperature steam transmission branch pipes 3, and they correspond one-to-one.

[0039] The waste heat cooling pipe includes a waste heat cooling main pipe 14 and multiple waste heat cooling branch pipes 15; the waste heat cooling main pipe 14 is a hollow cylinder with one end closed, and the open end of the waste heat cooling main pipe 14 is connected to the waste heat cooling plate heat exchanger; multiple through holes VII are provided on the circumferential surface of the waste heat cooling main pipe 14.

[0040] The number of through holes VII and the number of waste heat cooling branch pipes 15 are the same as the number of fan tube bundle air coolers 5; one end of each of the multiple waste heat cooling branch pipes 15 is connected to a through hole IV, and the other end is connected to a through hole VII.

[0041] The waste heat cooling branch pipe 15 is equipped with valve II 12. The number of valves II 12 is the same as the number of waste heat cooling branch pipes 15, and they correspond one-to-one.

[0042] Specific usage process: When heat exchange is not required, close valve II 12, open valve I11, and turn on fan 10 to allow high-temperature steam to be condensed through fan tube bundle air cooler 5 and then discharged through condensate discharge pipe 4; when heat exchange is required, close valve I11, turn off fan 10, and open valve II 12 to allow high-temperature steam to enter space I and then enter waste heat refrigeration plate heat exchanger through waste heat refrigeration pipe.

Claims

1. An air cooler and waste heat refrigeration plate heat exchanger combination system, characterized in that, The high-temperature steam conveying pipe, the condensate discharging pipe, the air cooler, the waste heat refrigeration pipe and the waste heat refrigeration plate heat exchanger are arranged in the high-temperature steam condensing device. The air cooler is a fan tube bundle type air cooler, and the fan tube bundle type air cooler comprises a cooling box main body, a partition I, a partition II, a tube bundle and a fan. The cooling box main body is a hollow cuboid structure; the partition I and the partition II are located in the cooling box main body and divide the inside of the cooling box main body into three sealed spaces from left to right, which are respectively named as space I, space II and space III; the partition I is provided with a through hole I, and the partition II is provided with a through hole II; the tube bundle comprises two or more hollow tubes, and the hollow tubes are horizontally arranged and sequentially pass through the through hole I and the through hole II, so that the space I is communicated with the space III through the hollow tubes. One end of the waste heat refrigeration pipe is connected with the space I through a through hole IV on the side of the cooling box main body, and the other end of the waste heat refrigeration pipe is connected with the waste heat refrigeration plate heat exchanger; the cooling box main body is provided with an inlet and an outlet, the inlet is used for connecting the high-temperature steam conveying pipe with the space I, and the outlet is used for connecting the space III with the condensate discharging pipe; the fan is used for cooling the cooling box main body, so that the high-temperature steam is condensed into condensate; the cross-sectional area of the inlet of the cooling box main body is the same as the cross-sectional area of the through hole IV; the condensate discharging pipe is provided with a valve I, and the waste heat refrigeration pipe is provided with a valve II.

2. The system according to claim 1, wherein, The number of the through hole I is the same as the number of the through hole II and the hollow tube.

3. The system of claim 2, wherein the air cooler is a finned tube air cooler. The fan is arranged below the cooling box main body.

4. The system according to claim 3, wherein the air cooler is a finned tube type air cooler. The high-temperature steam conveying pipe is provided with a valve III.

5. The system of claim 4, wherein, The number of the fan tube bundle type air cooler is multiple.

6. The system of claim 5, wherein the air cooler is a finned tube air cooler. The high-temperature steam conveying pipe comprises a high-temperature steam conveying main pipe, a high-temperature steam conveying transition pipe and multiple high-temperature steam conveying branch pipes; the high-temperature steam conveying transition pipe is a hollow cylinder with both ends sealed; the circumferential surface of the high-temperature steam conveying transition pipe is provided with a through hole V and multiple through holes VI; the high-temperature steam conveying main pipe is connected with the through hole V; the number of the through hole VI is the same as the number of the fan tube bundle type air cooler; one end of each of the multiple high-temperature steam conveying branch pipes is connected with one through hole VI, and the other end of each of the multiple high-temperature steam conveying branch pipes is connected with the inlet of one fan tube bundle type air cooler; the number of the valve III is the same as the number of the high-temperature steam conveying branch pipe, and the valve III is arranged on the high-temperature steam conveying branch pipe and corresponds to each high-temperature steam conveying branch pipe.

7. The system according to claim 6, wherein, The waste heat refrigeration pipe comprises a waste heat refrigeration main pipe and multiple waste heat refrigeration branch pipes; the waste heat refrigeration main pipe is a hollow cylinder with one end sealed, and the opening end of the waste heat refrigeration main pipe is connected with the waste heat refrigeration plate heat exchanger; the circumferential surface of the waste heat refrigeration main pipe is provided with multiple through holes VII; The number of the through hole VII is the same as the number of the fan tube bundle type air cooler; one end of each of the multiple waste heat refrigeration branch pipes is connected with one through hole IV, and the other end of each of the multiple waste heat refrigeration branch pipes is connected with one through hole VII; The number of the valve II is the same as the number of the waste heat refrigeration branch pipe, and the valve II is arranged on the waste heat refrigeration branch pipe and corresponds to each waste heat refrigeration branch pipe.

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