JP2561932Y2 - Concentration blower for multi-tube once-through boiler - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickening blower for a multi-tube once-through boiler.

[0002]

2. Description of the Related Art As boiler water evaporates, the concentration of suspended solids and dissolved salts gradually increases, causing carryover,
It produces scales and furnaces. To prevent this, it is necessary to drain part of the boiler water outside, replace it with fresh water, and lower the concentration. Therefore, a device is installed that measures the electrical conductivity of the boiler can water and automatically blows the boiler can water when the concentration exceeds a certain level.

[0003] In this case, a problem arises in that an expensive electric conductivity detecting device is required to measure the electric conductivity, and a complicated control circuit is also required to detect the electric conductivity. In addition, the electric conductivity detection device needs to perform careful maintenance (such as calibration of electric conductivity).

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a condensing blow device which does not use a complicated electric conductivity detecting device, is functionally simple, and requires little maintenance.

[0005]

A temperature detecting device is provided in the lower header, and when the water temperature in the header reaches a certain temperature or higher, the concentration blow electromagnetic valve is opened to blow from the lower header.
The water is supplied to the lower header by blowing, and when the water temperature decreases, the concentration blow solenoid valve is closed, and the blowing is terminated.

[0006]

[Function] The temperature in the lower header rises because the hot water that has reached the steam separator together with the steam is separated from the steam and circulated to the lower header. This means that the boiling water of cans has increased. Therefore, by blowing so that the temperature of the lower header becomes constant, the electric conductivity and the PH value of the canned water can be kept constant.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described. FIG. 1 is a schematic view of one embodiment, and shows a lower header (2) of a boiler (10).
A temperature sensor (1) is inserted in the inside, and an output result from the temperature sensor is sent to a concentration blow control device (7) for controlling opening and closing of a concentration blow valve (6). The water level in the can is detected by a water level detector (11) connected to the upper header (3) and the lower header, and water is supplied to the lower header by a water level control device (12) connected to the water level detector. The start and stop of the water supply pump (8) that performs the control is controlled to keep the water level constant. The hot water heated by the water pipe (9) reaches the upper header together with the generated steam and enters the steam separator (5). The steam and hot water are separated by the steam separator, the steam is sent to the steam supply destination, and the hot water is circulated to the lower header by the downcomer pipe (4). The circulated hot water mixes with the water in the lower header and the water temperature in the lower header increases. When the water temperature in the lower header reaches a certain value or more, the concentration blow control device opens the concentration blow valve and performs the concentration blow. When the water level is lowered by blowing, the water supply pump is operated, so that water having a low water temperature enters the lower header and the water temperature in the lower header decreases. When the water temperature becomes lower than the set temperature, the concentration blow control device closes the concentration blow valve and ends the concentration blow.

[0008]

[Effect of the Invention] By using the device according to the present invention, the same effect as that of the conventional concentration blow can be obtained, and the control circuit can be simplified. In addition, since maintenance of the temperature sensor is performed less frequently than in the electric conductivity detection device, it does not require much labor. Further, since the temperature of the lower header is kept constant, the effect of the chemical is also enhanced.

[0009]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature sensor 2 Lower header 3 Upper header 4 Downcomer 5 Steam separator 6 Concentration blow valve 7 Concentration blow controller 8 Feed water pump 9 Water pipe 10 Boiler 11 Water level detector 12 Water level controller

Claims (1)

(57) [Scope of request for utility model registration] 1. A large number of connections between an upper header and a lower header are provided, water is supplied through the lower header so as to maintain a constant water level, and heat generated together with steam generated by heating the water pipe. Water is sent to the steam separator through the upper header and circulated to the lower header through a downcomer connected to the lower header, and concentrated water is blown by opening and closing the concentration blow valve. In a multi-tube type once-through boiler, the temperature detector that detects the temperature of the bottom water in the lower header, and the temperature detector and the concentration blow valve are connected, and the temperature detected by the temperature detector exceeds the set value. A thickening blow control device for a multi-tube once-through boiler, wherein a thickening blow control device for opening a thickening blow valve at times is provided.