JPS62106288A - In-line cooler - Google Patents

Abstract

PURPOSE:To obtain the operating function of the deterioration in cooling performance of an in-line cooler itself as well as the operating function of the pumping amount of cooling fluid of a pump by a method wherein a detachable reference cooler, permitted to be attached to an equivalent fixed cooler in the flow path of the cooling fluid upon measuring only, is provided. CONSTITUTION:Fluid to be cooled, passing through a fixed cooler 3, is cooled by exchanging heat between cooling fluid, pumped by a pump and passing through the inside of an outer tube 8. A reference cooler 1 is attached to the outer tube 8 with bolts through bolt holes 102 provided on a mounting plate 101. The reference cooler 1 is removed from the outer tube 8 during usual operation. A flange 21 connects the connecting pipe 22 of the equivalent fixed cooler 2 to the connecting pipe 103 of the reference cooler 1. When the reference cooler 1 is removed, the fluid to be cooled flows into the equivalent fixed cooler 2 directly as shown by an arrow sign 201 in a diagram. Then, the temperatures of the fluid to be cooled and the cooling fluid are taken into an operator, whereby the result of estimation in the deterioration of cooling performance of the fixed cooler as well as the result of calculation of the flow amount of the cooling fluid may be obtained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an inline cooler as a cooling device for a pump station, and is used to calculate the decline in cooling performance of an inline cooler over time, and to calculate the flow rate of pumped water, which is a cooling fluid. This relates to an in-line cooler for a pumping station that also has the following functions.

[Background of the invention]

For conventional inline coolers, JP-A-56-911.8
No. 7, Japanese Patent Publication No. 58-47637, concerning the cooler itself is known, but no consideration is given to the direct calculation of cooling performance deterioration, which is important for maintenance management. In addition, at general pumping stations, flow meters that directly measure the amount of water pumped by the pumps are not installed due to equipment costs, and there has been a long-awaited development of a simple means of measuring flow.

[Purpose of the invention]

An object of the present invention is to provide an in-line cooler that has a function of calculating the cooling performance deterioration of the in-line cooler itself and a function of calculating the amount of pumped water of a pump serving as cooling fluid.

[Summary of the invention]

Generally, the cooling performance of a cooler is expressed by the following formula.

Q=K −A・ΔT=C−q・Δt Here, Q is the amount of heat exchanged, K is the heat transfer coefficient, A is the surface area of the heat transfer tube, ΔT is the average temperature difference, C is a constant, q is the flow rate in the cooling tube, Δt is the temperature difference between the inlet and outlet of the cooling pipe, the K value is related to the cooling performance of the cooler, and changes depending on the contamination of the cooling pipe, and the flow rate inside the cooling pipe and the flow rate outside the cooling pipe change as parameters. Therefore, when calculating the value change due to contamination due to aging, the temperature difference Δt at the entrance and exit is d1
Measure the flow rate inside the cooling pipe and the flow rate outside the cooling pipe.
By noting that a change curve can be obtained by doing this, we have made it possible to easily understand the cooling performance by installing an equivalent fixed cooler in the cooling fluid passage and a removable reference cooler that is installed only during measurement. It is characterized by the fact that

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG. 1 schematically shows the principle of the present invention. FIG. 2 is a structural diagram of an in-line cooler according to the present invention.

FIG. 3 shows a structural diagram of the standard cooler, and FIG. 4 shows a characteristic curve diagram. 8 is an outer cylinder that constitutes a part of the discharge piping of the pump;
A fixed cooler 3 is built in the outside Wis to constitute an in-line cooler. The fluid to be cooled passing through the fixed cooler 3 is cooled by heat exchange with the cooling fluid pumped up by the pump passing through the outer cylinder 8 in the direction of the arrow 10. 2 is an equivalent fixed cooler, and the inlet chamber 31 of the fixed cooler 3 is
It is connected to the. 32, 33 and 34 are return chambers, and adjacent chambers are partitioned by partition plates 36, 37 and 38. Pipes 3a and 3b are connected to each of the return chambers 32, 33 and 34 as inlet and outlet passages for the fluid to be cooled, and communicate with the final outlet chamber 35 so that the fluid flows in a meandering manner. A temperature measuring device 4 measures the temperature of the cooling fluid and transmits a measurement signal to the computing unit 7. Reference numeral 5 designates other temperature measuring devices, which are respectively provided on the entrance and exit sides of the reference cooler 1, and their measurement signals are transmitted to the computing unit 7. The reference cooler 1 is fixed to a plate 101, and is attached to the outer cylinder 8 through bolt holes 102 provided in the plate 101 by holes 1 to 1. It is removed during normal operation.

21 is a flange, connecting pipe 2 of equivalent fixed cooler 2
2 and the connecting pipe 103 of the reference cooler 1 are connected. A flange 23 is fixedly attached to the inlet pipe 104 of the reference cooler 1. 2oO is a connection pipe to the pipe 22 when the base cooler 1 is removed. In this case, the fluid to be cooled flows directly into the equivalent fixed cooler 2 as indicated by arrow 201. When it is removed from the reference cooler 1, the hole is covered with a blind lid having the same dimensions as the mounting plate 101. 6 is a flow meter in the cooling pipe,
Flanges 81 provided on the inlet side passage of the reference cooler 1 are provided at both ends of the outer cylinder 8, and are fixed to a discharge pipe (not shown) with bolts through bolt holes 82.

Next, the operation of the in-line cooler of the present invention will be explained with reference to FIG. The fluid to be cooled flows as shown by an arrow 20, passes through a cooling pipe flow meter 6, enters a reference cooler 1, passes through an equivalent fixed cooler 2 and a fixed cooler 3, is cooled, and is discharged. The temperature of the cooled fluid at each point is measured by the temperature measuring device 5, and the temperature of the cooling fluid is measured by the temperature measuring device 4, respectively. Each measured temperature is taken into the calculator 7, and as a result of the calculation, a calculation result of the cooling performance reduction of the fixed cooler and a calculation result of the flow rate of the cooling fluid are obtained.

Next, a specific example of the calculation method will be explained with reference to FIG. The heat transfer coefficient characteristic indicating the cooling performance of the reference cooler 1 is curve A.
This is a known curve as shown in . Therefore, as a general formula, the relational expression A·ΔT−K o =q·Δt holds true, so the value of Δ obtained as a result of temperature measurement is substituted, the heat transfer coefficient Ko value is calculated, and the point a is determined. Note that the q value is the flow rate in the cooling pipe managed by the flow rate meter 7 in the cooling pipe. A is the surface area of the heat exchanger tube, and ΔT is the average temperature difference. Next, the value of the equivalent fixed cooler 2 is calculated in the same manner. Since the K value is located at the second point of the line perpendicular to the horizontal axis by point a, the heat transfer coefficient characteristic curve B of the equivalent fixed cooler 2 can be calculated. Since the heat transfer coefficient characteristics of the equivalent fixed cooler 2 and the fixed cooler 3 are the same, the heat transfer coefficient characteristics of the fixed cooler 3 were determined. Next, while the heat transfer coefficient characteristics of the fixed cooler 3 do not change, the flow rate outside the cooling pipe can be calculated from the curve B by measuring Δt of the equivalent fixed cooler 2.

By periodically comparing the reference cooler 1 and the equivalent fixed cooler 2, the curve B is updated. Note that the reference cooler 1 is normally removed in order to maintain constant cooling performance, and is attached only when periodically measuring.

〔Effect of the invention〕

According to the present invention, it becomes easy to grasp the state of decline in cooling performance of an in-line cooler, and maintenance management becomes easy. In addition, since it is an in-line cooler that also functions as a flow meter, it is economical as there is no need to install a flow meter.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the present invention, FIG. 2 is a structural diagram of the present invention, FIG. 3 is a structural diagram of a reference cooler, and FIG. 4 is a characteristic diagram. ]...Reference cooler, 2...Equivalent fixed cooler, 3
...Fixed cooler, 4...Cooling fluid thermometer 811I
5... Cooled fluid temperature measuring device, 6... Cooling pipe internal flow meter 411 device,

Claims (1)

[Scope of Claims] 1. In an in-line cooler that includes a built-in cooler that cools the fluid to be cooled by using the fluid flowing through the piping as a cooling fluid in piping for pumping water, an in-line cooler is provided in the inlet side passage of the fluid to be cooled of the cooler. , an equivalent fixed cooler and a removable reference cooler that is attached only during measurement are connected in series and provided in the piping, and a cooled fluid temperature measuring device is provided at the entrance and exit portion of each of the equivalent fixed cooler and the reference cooler. A cooling fluid temperature measuring device is provided in the piping, and a computing device is provided for inputting signals measured by the two fluid temperature measuring devices and performing comparison calculations, so that the cooling performance of the fluid to be cooled can be grasped from the calculation results. An inline cooler characterized by: 2. A flow rate measuring device is provided in the inlet side passage of the fluid to be cooled, a reference cooler is provided between the flow rate measuring device and the cooler, and an equivalent fixed cooler is provided between the reference cooler and the cooler. In-line cooler according to scope 1. 3. The standard cooler consists of a mounting plate that is tightened and fixed with bolts to the body hole of the pump pump piping, a pipe that penetrates the mounting plate and projects an inlet/outlet part, and a connecting flange provided at the tip of the pipe. An in-line cooler according to claim 1.