JPH0419475B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a filtration device disposed in a cooling water pipe, and two measurement pipes connected to the cooling water pipe on the upstream and downstream sides of the filtration device. The present invention relates to a heat exchanger having a differential pressure detector connected through a heat exchanger, and in particular to a device for inspecting and cleaning a differential pressure measurement system in a condenser of a power plant.

[Conventional technology]

Such inspection and cleaning equipment is manufactured by Taprogge Gesellschaft mbH, the applicant of the present application.
Optimization of Cooling Water, a company newsletter published in October 1983.
Circuits). However, this device must be checked from time to time as to its functioning, and in addition the measuring line through which the cooling water is supplied must be cleaned, since there is a risk that dirt from the cooling water may adhere to the measuring line. For this purpose, a separate cleaning line, which branches off downstream of the filtration device and is equipped with a cleaning pump, is conventionally generally provided for this purpose. In this case, depending on the switching of the three-way valve, first the pressure chamber on one side of the differential pressure detector and the measuring pipe upstream of the filtration device are flushed, then the pressure chamber on the opposite side and the measuring pipe downstream of the filtration device are cleaned. Water is supplied and washed.
Such equipment with special wash water piping and expensive three-way valves requires high costs and introduces additional failures.

[Problem that the invention seeks to solve]

The object of the invention is to create an inspection and cleaning device which incorporates very simple piping, which is used in a wide range of applications, and which is functionally reliable.

[Means for solving problems]

According to the invention, this object is achieved in a device of the type mentioned at the outset, in which both pressure chambers of the differential pressure detector are connected to each other via a cleaning line with a check valve,
This can be achieved by incorporating a pump into one of the measurement pipes and applying high pressure to a pressure chamber connected to the downstream side of the filtration device.

〔Effect of the invention〕

According to the present invention, by directly incorporating the pump into one of the measurement pipes, no special cleaning pipe is required. Furthermore, by simply arranging the check valve in the pipe connecting the two pressure chambers of the differential pressure detector, no auxiliary adjustment operation is required, thereby resulting in a highly functionally reliable device.

In that case, preferably the check valve has a spherical valve body which is subject to its own weight. In this case, the check valve has a vertically arranged cylindrical housing with conical inlet and outlet sections, in which a valve body with a diameter larger than the diameter of the inlet and outlet connecting pipes is installed. It is placed in such a way that it can be lifted off its valve seat by the action of the current.

Furthermore, in an embodiment of the invention, the differential pressure detector is operatively connected to test contacts which are closed upon pressure build-up by the wash pump, in order to test all electrical test and measuring lines and measuring devices. Ru.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

In the embodiment shown in FIG. 1, the cleaning bodies 6 in the form of sponge balls are captured in a filtration device arranged downstream of the condenser 2 of the power plant and are removed again from the cooling water stream. has been done. For this purpose, two filter nets 3 and 4 with oval sides are generally installed in the cooling water outlet pipe 1 of the heat exchanger 2, and these can be swung to a vertical cleaning position about a horizontal axis 5. It is composed of The cleaning body 6 is received by the filter screens 3 and 4 and returned to the cooling water inlet pipe of the heat exchanger 2 via the discharge pipe 7 and a return circuit (not shown).

The cooling water of the heat exchanger 2 is usually filtered through filter screens 3 and 4.
It has fibrous or planar viscous dirt that accumulates on the surface. Therefore, over time, the filter screens 3, 4 become increasingly contaminated and the flow of cooling water is prevented, so that the filter screens 3, 4 are swung around their axis 5 into a vertical cleaning position. .

The increase in dirt on the filter screens 3, 4 increases the differential pressure across the filter screens 3, 4, and when this differential pressure exceeds a predetermined set value, the filter screens 3, 4 are oscillated.

In order to detect this differential pressure, a differential pressure detector 10 is provided, the upper pressure chamber 11 of which is connected via a measuring pipe 12 to the cooling water outlet pipe 1 upstream of the filter screens 3, 4, while the detector 10 lower pressure chamber 13
is connected to the cooling water outlet pipe 1 downstream of the filter nets 3 and 4. When the differential pressure before and after the filter screens 3 and 4 increases, for example, the diaphragm 1 of the differential pressure detector 10
5 is displaced downwards, thereby closing the contacts when a set value is exceeded, thereby swinging the filter screens 3, 4 into their cleaning position.

There is a risk that the dirt carried away by the cooling water can, for example, adhere to the measuring pipe 12 and possibly also the measuring pipe 14, causing blockages there and distorting the measurement results. Furthermore, the entire system must be checked for its functionality from time to time.

In order to remove such contamination from the measuring lines 12, 14 and to test the entire measuring device, these measuring lines 12, 14 must be cleaned so that the differential pressure detector 10 is exposed to the detected pressure.

For this purpose, according to the invention, for example a filter screen 3,
A pump 16 for conveying in the direction of the differential pressure detector 10 is installed in the measuring pipe 14 downstream of the
It is proposed to use the measuring pipe 14 at the same time as a cleaning pipe. In order to be able to clean the pressure chambers 11, 13 of the detector 10 and the measuring line 12 upstream of the filter screens 3, 4, the pressure chambers 13, 11 are connected via a line 17 in which a check valve 18 is installed. connected to each other.

During cleaning, cleaning water is forced from the cooling water outlet piping 1 through the measurement piping 14 and the pressure chamber 13 as the pump 16 is turned on, and after the check valve 18 is opened, the cleaning water is sent to the upper pressure chamber 11 through the connecting piping 17. After flowing through the measuring pipe 12, it is returned to the cooling water outlet pipe 1 upstream of the filter nets 3, 4.

In this case, as the check valve 18, a self-weight loaded valve as shown in FIG. 2 is suitable. The check valve 18 is
It has a vertically arranged cylindrical casing 19 with a conical inlet part 20 and a conical outlet part 21, into which the diameters of the inlet and outlet connecting short pipes 23, 24 are arranged. A spherical valve body 22 with a larger diameter is inserted. Due to the vertical arrangement of the casing 19, the valve body 22 is always connected to the lower inlet connection short pipe 23 during operation.
will be closed. When the cleaning process is started, this valve body 22 is lifted from its valve seat by the action of the cleaning flow and the upper pressure chamber 11 of the differential pressure detector 10 is
Free flow to.

FIG. 3 shows the structure of the differential pressure detector 10 with respect to contacts in principle. Generally, during measurement operation, when the filter nets 3 and 4 become more contaminated, a higher pressure is applied to the upper pressure chamber 11 than the lower pressure chamber 13.
When the diaphragm 15 is displaced downwards and reaches the set value, the contact K1 is closed via the pin 26 connected to the diaphragm 15, so that the circulation of the cleaning body 6 is first started via the corresponding electric mechanism. It is stopped, and then the filter screens 3 and 4 are swung.

When cleaning the device according to the invention, first a high pressure is applied to the lower pressure chamber 13, which bends the diaphragm 15 upwards and closes the contact K2 via the pin 27, thereby closing the entire electrical system. will be made available for inspection.

That is, if contact K2 is closed during cleaning, the following test criteria are met.

1 Measurement pipes 12 and 14 are not blocked.

2 The differential pressure detector 10 operates regularly.

3 Electrical measuring lines, including controls and other devices, operate as specified.

Regarding the operation of this measuring and testing device, please refer to the fourth section.
The principle will be explained with reference to the fluctuation of the pressure indicator as shown in Figures a and b.

During normal operation, the pointer 30 of the pressure indicator 31 swings to the right from its neutral position, as shown in Figure 4a, and when the set differential pressure that requires cleaning the filter screens 3 and 4 is reached, the contact K1 closes. Closed. On the other hand, in the case of cleaning, as shown in FIG. 4b, the pointer 30 swings to the left due to the negative pressure difference until it reaches the contact K2 and closes it, which causes a corresponding test signal to be generated. .

In the illustrated embodiment, the pump 16 is connected to the filter screens 3, 4.
It is incorporated into the measuring pipe 14 downstream of and conveyed in the direction of the differential pressure detector 10. In the same way, the pump 16 is connected to the measuring pipe 1 upstream of the filter nets 3 and 4.
2, in which case the pump 16
is conveyed in the direction of the cooling water outlet line 1, the cleaning liquid is sucked out through the measuring system, and a higher pressure is generated in the pressure chamber 13 than in the pressure chamber 11, so that the same effect is achieved.

It is of course also possible to integrate the inspection and cleaning device according to the invention in the same way in a further filtration device in the cooling circuit, for example in a filtration device integrated in the cooling water inlet pipe used for purifying the cooling water.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the entire device based on the present invention, Fig. 2 is a sectional view of the check valve, Fig. 3 is a structural diagram of the arrangement of contacts of the differential pressure detector, and Figs. 4a and 4b are pressure FIG. 3 is a layout diagram of contacts in the meter. 1: Cooling water outlet piping, 2: Heat exchanger, 3, 4:
Filter net, 6: Cleaning body (sponge ball), 10: Differential pressure detector, 11: Upper pressure chamber, 12: Measurement piping,
13: Lower pressure chamber, 14: Measurement piping, 15: Diaphragm, 16: Pump, 17: Connection piping, 1
8: Check valve.

Claims (1)

[Claims] 1. A filtration device disposed in a cooling water pipe, and a differential pressure detector connected to the cooling water pipe via two measurement pipes on the upstream and downstream sides of the filtration device. In the inspection and cleaning device for a differential pressure measurement system in a heat exchanger having Inspection of a differential pressure measurement system characterized in that a pump 16 is incorporated in one of the measurement pipes 12, 14, and high pressure can be applied to the pressure chamber 13 connected to the downstream side of the filtration devices 3, 4. cleaning equipment. 2. Claim 1, characterized in that the check valve 18 has a spherical valve body 22 that bears its own weight.
Apparatus described in section. 3. The check valve 18 has a vertically arranged cylindrical casing 19 with conical inlet and outlet parts 20, 21, into which the inlet and outlet connecting short pipes 23, 24 are arranged. 2. Device according to claim 1, characterized in that a valve body (22) of a larger diameter is inserted in such a way that it can be lifted from its valve seat under the action of the cleaning flow. 4. that the differential pressure detector 10 is operatively connected to the test contact K2, which is closed upon pressure increase by the cleaning pump 16, in order to test all electrical test and measuring lines and measuring devices; An apparatus according to claim 1, characterized in: