JPS5969690A - Operation monitoring device for condenser - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of the device by a method wherein the operation and indication of the degree of cleanness of the condenser may be effected even during the operation of the whole of the device and the inspection as well as the repair of the condenser are permitted to be effected at a proper timing. CONSTITUTION:The average temperature difference thetam of cooling water at the outlet and inlet of the condenser is obtained at every periods in an unit 22 after the electric source of the monitoring device is thrownin. Next, an actual amount Wa of the cooling water is obtained from a reference heat exchanging amount Qa or the like in the unit 23 and, further, an actual heat-transmission coefficient Ka is obtained from the average temperature difference thetam, the reference heat exchanging amount Qa and the like in the unit 24. The actual heat-transmission coefficient Ka is converted into an equivalent heat-transmission coefficient Kas by using the actual amount Wa of the cooling water and the reference amount Ws of the cooling water in th unit 25, then, the degree of cleanness Rct is obtained from the ratio of the equivalent heat- transmission coefficient Kas to the reference heat-transmission coefficient Kds in the unit 26. A statistical value of the degree of cleanness Rct in the unit of one week or one month, which are obtained in every constant period, is obtained in the unit 27, and the result is indicated on an indicating device in the unit 29 if an output is requested in the unit 28 by an operation monitorer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a condenser operation monitoring device that can monitor the cleanliness of a condenser.

[Background technology of the invention and its problems]

In general power generation equipment, the operating efficiency of the entire power generation equipment fluctuates depending on the operating load conditions of the various main machines and auxiliary machines that make up the power generation equipment.

The same can be said of the condenser, which is an important component of the above-mentioned power generation equipment.

Such condensers generally use seawater as cooling water, so if they are operated for a long period of time, deposits may accumulate on the cooling pipes, etc., and the cooling pipes may become corroded. Heat exchange efficiency decreases.

Therefore, conventionally, the ratio between the heat transfer coefficient during operation of the J condenser and the reference heat transfer coefficient set at the time of design is defined as the cleanliness, and this cleanliness is used as one index of the heat exchange efficiency. and,
The condenser was inspected and repaired when the cleanliness level fell below a certain limit.

However, with conventional condensers, the work to determine the cleanliness level could only be carried out during periodic inspections of the entire power generation equipment, so if the cleanliness level drops, it should be immediately reported to the equipment operation supervisor. That information was not conveyed. Therefore, there was a problem that the efficiency of the entire power generation equipment decreased.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose of this is to be able to calculate and display the cleanliness of the condenser even when the entire facility is in operation, to enable inspection and repair of the condenser at an appropriate time, and to improve the quality of the facility. An object of the present invention is to provide a condenser operation monitoring device that can improve operational efficiency.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized in that a condenser operation monitoring device is configured as follows.

That is, an actual heat transfer coefficient calculation unit that calculates the actual heat transfer coefficient and the actual amount of cooling water, respectively, using the heat exchange amount of the condenser and the cooling water temperature at the inlet and outlet of the condenser, which are predetermined according to the load state. and an actual cooling water amount calculating section, which converts the actual heat transfer coefficient into an isolateral heat transfer coefficient using the actual cooling water amount and the reference cooling water amount in the reference load state stored in the reference cooling water amount storage device. Cleanliness calculation that includes a side heat 1 flow rate calculation unit and calculates the cleanliness represented by the ratio of the equal side heat transfer coefficient and the reference heat transfer coefficient in the reference load state stored in the reference heat transfer coefficient storage device. The present invention is characterized in that it further includes a statistical processing section that performs statistical processing of the cleanliness, and a display device that displays the results of the statistical processing and the cleanliness before processing.

[Embodiments of the invention]

FIG. 1 is a block diagram of a condenser operation monitoring device according to an embodiment of the present invention. This block configuration diagram will be explained according to the signal flow.

That is, input signals from the condenser, such as the load state a representing the load state of the condenser operating under an arbitrary load state, the cooling water inlet temperature t, and the outlet temperature t7, are sent via the input control device 1. and is input to the arithmetic processing unit 2. The input signal input to the arithmetic processing device 2 is given to the actual cooling water amount calculation section 3 and the average temperature difference calculation section 4. On the other hand, the reference heat exchange amount storage device 5 stores a reference heat exchange amount of the condenser that is preset according to each load state. The actual cooling water amount calculation unit 3 calculates the reference heat exchange amount Q stored in the reference heat exchange amount storage device 5 corresponding to the load state a, and the inlet and outlet temperatures jl+L! The actual cooling water amount Wa in the load state a shown by equation (1) is determined using the equation (1).

However, C is the specific heat of the cooling water.

Ω.

Further, the average temperature difference calculating section 4 calculates the average temperature difference θm shown by equation (2). However, t8 is the hot well temperature of the condenser.

Further, in the actual heat flow rate calculation unit 6, the heat transfer coefficient of the condenser in the load state a, that is, the actual heat transfer coefficient Ka, is calculated as the reference heat exchange amount Q, the average temperature difference θm, and the heat transfer area S of the cooling pipe. Find from.

Ka = Qa/S・θ□・・・・
(3) Next, by using the reference cooling water amount W3 in the reference load state S set at the time of design, which is stored in the reference cooling water amount storage device 7, and the above-mentioned actual cooling water amount Wa, the isolateral heat transfer coefficient calculation unit In step 8, the isolateral heat transfer coefficient Ka shown in equation (4) is determined. However, k is a correction coefficient.

That is, the equivalent heat transmission coefficient Ka8 is a value obtained by extrapolating the actual heat transmission coefficient in the reference load state S from the actual heat transmission coefficient Ka in the actually measured load state a.

Next, in the cleanliness calculation section 9, the above equivalent heat transmission coefficient Ka
11, and the reference heat transfer coefficient Kds in the reference load state B set at the time of design stored in the reference cooling water amount storage device 1θ.
The cleanliness Rcf of this condenser is determined from the ratio.

This cleanliness level Rcf is displayed on a display device 12, such as a line grinder or a CRT device, provided outside the arithmetic processing device 2 via the output control device J1 in response to a command e from an operator of the facility.

Further, when the condenser is operated for a long period of time, the cleanliness Rcf for -weeks or one month is determined. The average value, standard deviation σ, etc. are displayed on the display device 12 via the output control device 11 in accordance with the command e, and are also output for record storage.

FIG. 2 is a flowchart showing the calculation procedure of the condenser operation monitoring device according to the embodiment shown in the block diagram of FIG. 1. After turning on the power of the monitoring device, it is checked in the trench 21 whether or not the condenser is actually activated. When activated, the average temperature difference θm of the cooling water at the inlet and outlet of the condenser is determined at regular intervals in step 22. Next, in step 23, the actual cooling water amount Wa is calculated from the reference heat exchange amount, etc., and in step 24
Further, the actual heat transfer coefficient Ka is determined from the average temperature difference θm, the reference heat exchange amount Qa, and the like. 25, the actual heat transfer coefficient is expressed as the actual cooling water amount WIL and the reference cooling water i.
tW, is converted into an isolateral heat transmission coefficient Kas, and in step 26, the cleanliness Rcf is determined from the ratio of the isolateral heat transmission coefficient &8 and the reference transmission coefficient Kdg. Then, in step 27, the statistical value (also σ) of the cleanliness Rcf obtained at a certain period of time is obtained in weekly or -monthly units, and if there is an output request from the operation supervisor in step 28, the results are displayed on the display device in step 29. to be displayed.

With a monitoring device having such a configuration, a detector or the like is installed to continuously measure the load condition a and the cooling water inlet temperature t1 and outlet temperature t2, and this information is inputted to the arithmetic processing unit via the control device 1. 2, even if the condenser is operating under any load condition, the cleanliness Rcf at the standard load condition is continuously calculated, and this is applied to the line grinder and CRT device as necessary. It can be displayed on a display device 12 such as the following. Therefore, if the cleanliness Ref drops below the specified value for some reason, that information is immediately conveyed to the operation supervisor, which allows the condenser to be inspected and repaired at an appropriate time, which ultimately improves power generation. The operating efficiency of the entire equipment can be improved.

In addition, the above-mentioned load state a, inlet temperature tI,
The cleanliness level Rcf is calculated by inputting the outlet temperature t, and the statistical processing unit 13 calculates the weekly or monthly average value, standard deviation σ, etc., and the results are periodically output to a line printer or other output device. 12 can be printed out. Therefore, the average value and fluctuations for each week and month can be grasped, and even if fluctuations are repeated and the value gradually decreases, inspection and repair of the condenser can be carried out at the optimal time.

Note that the present invention is not limited to the embodiments described above. In general, the heat transfer coefficient of a condenser changes significantly depending on the load condition, so in this example, the measured actual heat transfer coefficient Ka was
The heat transfer coefficient is converted to the heat transfer coefficient for one set reference load state B, but a number of the above reference load states are set according to the load state, and the reference heat transfer coefficient at the time of design under multiple load states is calculated in advance. The cleanliness rate and standard cooling water amount are stored in the storage device, and during operation, the cleanliness R at the closest standard load condition is stored.
cf may also be obtained. In this case, it is possible to obtain more accurate cleanliness corresponding to the load state.

〔Effect of the invention〕

As explained above, according to the present invention, the actual heat transfer coefficient actually measured in the condenser in operation under an arbitrary load state is converted into the heat transfer coefficient in the reference load state, that is, the isolateral heat transfer coefficient,
The cleanliness is determined by comparing it with the reference heat transfer coefficient stored in advance in the storage device and displayed on the display device at any time, so the operator monitoring the operation of the condenser can check the deterioration of the cleanliness whenever necessary. can be confirmed. Therefore, it is possible to inspect and repair the condenser at an optimal time, and as a result, the operating efficiency of the entire power generation facility can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a condenser operation monitoring device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the calculation procedure of the monitoring device. 1... Input control device, 2... Arithmetic processing device, 3...
・Actual cooling water amount calculation unit, 4...Average temperature difference calculation unit, 5.
. . . Reference heat exchange amount storage device, 6 . . . Actual heat transfer coefficient calculation unit, 7 . , 10... Reference thermal conductivity storage device, 1... Output control device, 12... Display device, 13... Statistical processing section.

Claims (1)

[Claims] In a condenser operation monitoring device that monitors the cleanliness of a condenser operated under a given load condition, the heat exchange amount of the condenser and the condenser are determined in advance according to the load condition. an actual heat transfer coefficient calculating section that calculates an actual heat transfer coefficient using the cooling water temperature at the inlet and outlet of the cooling water; an actual cooling water amount calculation section that calculates the actual cooling water amount using the heat exchange amount and the cooling water temperature; an isolateral heat transfer coefficient calculation unit that converts the actual heat transfer coefficient into an isoside heat transfer coefficient using the actual cooling water amount and a reference cooling water amount in a reference load state stored in a reference cooling water amount storage device;
A cleanliness calculation unit that calculates the cleanliness by calculating the ratio between the equal side heat transfer coefficient and the reference heat transfer coefficient in a reference load state stored in a reference heat transfer cell and storage device, and statistical processing of the cleanliness. What is claimed is: 1. A condenser operation monitoring device comprising: a statistical processing unit that performs the statistical processing; and a display device that displays the statistical processing results and the cleanliness level before processing.