CN211783641U

CN211783641U - System for detecting flow of heat exchanger in real time

Info

Publication number: CN211783641U
Application number: CN202020594581.7U
Authority: CN
Inventors: 李艳兵; 曹琦; 胡轩
Original assignee: Shenzhen Hongshida Energy Technology Co ltd
Current assignee: Shenzhen Hongshida Energy Technology Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-10-27
Anticipated expiration: 2030-04-20

Abstract

An embodiment of the utility model provides a system for real-time detection heat exchanger flow belongs to petrochemical technical field. The system includes a heat exchanger; the first detection device is used for detecting the real-time water pressure at the circulating water inlet of the heat exchanger in real time; the second detection device is used for detecting the real-time water pressure at the circulating water outlet of the heat exchanger in real time; and the first detection equipment and the second detection equipment are connected to the upper computer through serial port communication. The utility model discloses, import and export two pressure transmitter of configuration at heat exchanger circulating water side, can be under the condition of not installing the flowmeter, obtain the demonstration of real-time flow by the host computer to need not input the extra cost of other purchase flowmeters for this reason.

Description

System for detecting flow of heat exchanger in real time

Technical Field

The embodiment of the utility model provides a petrochemical technical field relates to, especially, relate to a system of real-time detection heat exchanger flow.

Background

At present, the heat exchanger scale deposit can seriously influence the operation of device in the petrochemical field, causes huge potential safety hazard. The heat conductivity coefficient of the dirt is generally 0.464-0.696W/(mK), is only 1/40-1/80 of the heat conductivity coefficient of steel, and is 1/300 of the heat conductivity coefficient of copper. The heat transfer capacity of the thick scale is equivalent to that of a steel plate with the thickness of 40-80 mm or a copper plate with the thickness of 300 mm. Because the heat conductivity coefficient of the dirt is extremely low, the heat transfer performance of heat exchange equipment can be seriously influenced by scaling, the production energy consumption is greatly increased, and 10 percent of coal can be more burnt by the scale with the thickness of 1mm in a coal-fired boiler, so that the production cost of industrial products is greatly increased. Scaling worsens the heat conduction condition of the heat exchange equipment, causes safety accidents such as blistering, cracks, pipe explosion and the like due to over-temperature and overheating of a heat transfer surface, and can interrupt production in serious conditions to cause planned production halt of petrochemical industry.

Usually, each chemical plant checks the flow condition in a set time period to pre-judge whether the water side of the heat exchanger is scaled, for example, when the lowest scaling-prevention flow velocity of a certain petrochemical is 0.9m/s and the running flow velocity is lower than 0.9m/s, the cooled circulating water pipeline has the scaling trend; the minimum petrochemical anti-scaling flow rate of the Wuluqiqi is 1.2m/s, and when the operation flow rate is lower than 1.2m/s, the cooled circulating water pipeline has a scaling trend, and the flow rate display is particularly important. The current method is only to dispatch operators to test the flow on site and record the flow at regular intervals, and the method has extremely low efficiency.

In view of the foregoing, there is a need for a system for real-time flow measurement of cooling water circulating through a heat exchanger without the use of a flow meter.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a system for real-time detection heat exchanger flow aims at in one kind not need the flowmeter just can real-time detection flow system to heat exchanger recirculated cooling water.

In order to solve the technical problem, the embodiment of the utility model provides a system for real-time detection heat exchanger flow is proposed, the system includes: a heat exchanger; the first detection device is used for detecting the real-time water pressure at the circulating water inlet of the heat exchanger in real time; the second detection device is used for detecting the real-time water pressure at the circulating water outlet of the heat exchanger in real time; and the first detection equipment and the second detection equipment are connected to the upper computer through serial port communication.

Further, the system further comprises: and the enterprise management system is connected with the upper computer through the Internet.

Further, the serial port communication adopts a modbus protocol or a profibus protocol.

Furthermore, the serial port communication adopts a 4-20 mA communication control signal.

Further, the first detection device and the second detection device comprise pressure transmitters.

Compared with the prior art, the beneficial effects of the utility model are that: two pressure transmitters are arranged at an inlet and an outlet of the circulating water side of the heat exchanger, so that the upper computer can obtain real-time flow display without installing a flowmeter, and the cost is saved.

Drawings

One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.

FIG. 1 is a schematic diagram of a prior art heat exchanger;

fig. 2 is a schematic diagram of a system for detecting a flow rate of a heat exchanger in real time according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a schematic diagram of a conventional heat exchanger is shown, in which a petroleum raw material undergoes a series of physical and chemical reactions, a high-temperature raw gas passes through a material inlet to a material outlet, the process is generally called a shell side, generally, the raw gas enters from the bottom to the top, and relatively low-level circulating water passes through a circulating water inlet to a circulating water outlet and is subjected to heat and mass exchange through a pipeline wall to perform heat transfer. The process is generally called a tube pass, generally, the materials are fed in from top to bottom, and the circulating water brings high-temperature material heat.

Referring to fig. 2, an embodiment of the present invention provides a schematic diagram of a system for detecting a flow rate of a heat exchanger in real time, wherein the system comprises: the heat exchanger 21, the heat exchanger 21 can be arranged at the top of a naphtha fractionating tower, the top of a topping oil stripping tower, the bottom of the topping oil stripping tower, in a sub-refining system such as a contact feeding system and a stabilizing tower top, and the system structure of only one heat exchanger is shown in the figure; the first detection device 22 is used for detecting the real-time water pressure at the circulating water inlet of the heat exchanger 21 in real time; the second detection device 23 is used for detecting the real-time water pressure at the circulating water outlet of the heat exchanger 21 in real time, and the first detection device and the second detection device are pressure transmitters; the first detection device 22 and the second detection device 23 are connected to the upper computer 24 through serial port communication. The number of the upper computers 24 can be set to be more than one according to the requirement,each upper machine 24 can be connected to one or more heat exchangers 21. If the pressure detected by the first detection equipment of the same heat exchanger is P₁The pressure detected by the second detection device is P₂Then the pressure difference Δ P ═ P of the heat exchanger₁-P₂S is the comprehensive resistance coefficient of the pipeline in the pipeline system, S can be obtained through testing, the heat exchanger is located in the resistance self-molding area of the pipeline system, the S value is kept unchanged, the upper computer obtains delta P again, and the real-time flow value can be obtained by combining the comprehensive resistance coefficient S of the pipeline before

The upper computer can display the flow condition of each heat exchanger branch, and can visually judge the running condition of the heat exchanger in real time.

Further, the system further comprises: the enterprise management system 25 of the upper computer is connected through the internet, and the enterprise management system 25 is used for receiving and managing the flow value of each heat exchanger 21.

In the embodiment, two pressure transmitters are arranged at the inlet and the outlet of the circulating water side of each heat exchanger, so that the real-time flow display can be obtained by the upper computer without installing a flowmeter, and other extra cost is not required to be invested.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A system for real-time monitoring of heat exchanger flow, the system comprising: a heat exchanger; the first detection device is used for detecting the real-time water pressure at the circulating water inlet of the heat exchanger in real time; the second detection device is used for detecting the real-time water pressure at the circulating water outlet of the heat exchanger in real time; and the first detection equipment and the second detection equipment are connected to the upper computer through serial port communication.

2. The system for real-time detection of heat exchanger flow of claim 1, further comprising: and the enterprise management system is connected with the upper computer through the Internet.

3. The system for detecting the flow of the heat exchanger in real time as claimed in claim 1, wherein the serial port communication adopts a modbus protocol or a profibus protocol.

4. The system for detecting the flow of the heat exchanger in real time as claimed in claim 1, wherein the serial port communication adopts a 4-20 mA communication control signal.

5. The system for real-time detection of heat exchanger flow of claim 1, wherein the first and second detection devices are pressure transmitters.