JPH0674803U - Concentration blower for multi-tube type once-through boiler - Google Patents

Abstract

(57) [Summary] [Purpose] In a multi-tube once-through boiler, appropriate can water is concentrated and blown without using an electrical conductivity detector that requires frequent maintenance. [Structure] A temperature detecting device is provided in the lower pipe header, and when the water temperature of the can exceeds a certain level, concentration blow is performed, and when the water temperature decreases, the concentration blow is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concentration blower for a multi-tube once-through boiler.

[0002]

[Prior art]

 As the boiler water evaporates, the concentration of suspended solids and dissolved salts gradually increases to form a caliber, and scales and jars are generated. In order to prevent this, it is necessary to discharge part of the boiler water to the outside, replace it with new water and reduce the concentration. Therefore, we have installed a device that measures the electrical conductivity of boiler can water and automatically blows boiler can water when the concentration exceeds a certain level.

In this case, a problem is that an expensive electric conductivity detection device is required to measure the electric conductivity, and a complicated control circuit is also necessary to detect the electric conductivity. In addition, the electrical conductivity detector requires careful maintenance (calibration of electrical conductivity, etc.).

[0004]

[Problems to be solved by the device]

 The purpose of this is to supply a concentrated blow device that does not use a complicated conductivity detector and is a functionally simple device that requires less maintenance.

[0005]

[Means for Solving the Problems]

 A temperature detector is installed in the lower header, and when the water temperature in the header exceeds a certain temperature, the concentration blow solenoid valve is opened to blow from the lower header. Water is supplied to the lower head by blowing, and when the water temperature drops, the concentration blow solenoid valve is closed and the blow is finished.

[0006]

[Action]

 The temperature inside the lower header is increased because the hot water that has reached the steam separator together with the steam is separated from the steam and circulates to the lower header. It means that the boiling of water increased. Therefore, by blowing so that the temperature of the lower pipe is constant, the electric conductivity and PH value of the can water can be kept constant.

[0007]

【Example】

 An embodiment of the present invention will be described. FIG. 1 is a schematic diagram of an embodiment, in which a temperature sensor (1) is inserted in the lower head (2) of a boiler (10), and the output result of the temperature sensor is the concentration blow valve (6). It is sent to the concentration blow control device (7) that controls the opening and closing. The water level in the can is detected by the water level detection device (11) connected to the upper head (3) and the lower head, and the water level control device (12) connected to the water level detector controls the lower head. The water level is kept constant by controlling the start and stop of the water supply pump (8) that supplies water. The hot water heated in the water pipe (9) reaches the upper pipe 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 head by the downcomer pipe (4). The circulated hot water mixes with water in the lower header, and the water temperature in the lower header rises. When the water temperature in the lower head reaches a certain value or more, the concentration blow control device opens the concentration blow valve to perform the concentration blow. When the water level is lowered by blowing, the water supply pump is operated, so that water with a low water temperature enters the lower head and the water temperature in the lower head drops. When the water temperature falls below the set temperature, the concentration blow control device closes the concentration blow valve and ends the concentration blow.

[0008]

[Effect of device]

 By using the device according to the present invention, the same effect as the conventional concentration blow can be obtained, and the control circuit can be simplified. In addition, maintenance of the temperature sensor is less frequent than that of the electrical conductivity detection device, so it does not take much time. Furthermore, since the temperature of the lower head is kept constant, the effect of chemicals can be enhanced.

[0009]

[Brief description of drawings]

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

[Explanation of symbols]

 1 Temperature Sensor 2 Lower Pipe Heading 3 Upper Pipe Heading 4 Precipitation Pipe 5 Water-Water Separator 6 Concentration Blow Valve 7 Concentration Blow Control Device 8 Water Supply Pump 9 Water Pipe 10 Boiler 11 Water Level Detection Device 12 Water Level Control Device

Claims (1)

[Scope of utility model registration request] 1. In a multi-tube once-through boiler that supplies water to the lower header and performs concentration blow from the lower header, a temperature detection device is provided in the lower header, and a concentration blow valve is opened / closed by a signal from the temperature detection device. A concentrating blow device for a multi-tube once-through boiler, which is characterized by performing.