JPH0140985Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a combustion device suitable for spray combustion of slurry fuel.

<Conventional technology and its problems> With recent changes in the fuel situation, combustion equipment such as large boilers for thermal power generation is changing from petroleum-based fuel to other fuels, or co-firing other fuels and petroleum-based fuel. tends to be carried out. COM (mixed fuel of pulverized coal and oil) and CWM (mixed fuel of pulverized coal and water)
Even if such slurry fuels are adopted in earnest, co-firing with heavy oil is likely, and it would be uneconomical to install slurry combustion and heavy oil combustion burner devices completely separately. Therefore, only the burner gun should be replaced, or preferably There is a need to develop a burner that can be used for both purposes. For this reason, for example, JP-A-58-88526, JP-A-57-184817, JP-A-55-128717, JP-A-58-83110, considering the case where only the burner gun is replaced,
A two-fluid spray burner has been proposed, such as in Japanese Patent Application Laid-Open No. 58-179714.

However, although these burner devices can burn without problems during normal operation, if there is an increase in unburned matter due to poor spraying due to nozzle abrasion or nozzle clogging during slurry combustion, or if there is a misfire, or if there is a malfunction on the boiler side, the burner may fail. If it is impossible to stop the burner and purge the fuel remaining in the burner, the following problems occur. In other words, the burner gun itself is heated by steam, and the wind box itself in which this burner gun is placed is heated to approximately 300℃ due to the high temperature combustion air.
As a result, methanol, heavy oil, water, etc. used as a solvent for the slurry are gasified, and the individual solid particles solidify into one piece, causing a problem that the slurry passage inside the burner gun is clogged.

<Purpose of the present invention> The present invention has been constructed in view of the above-mentioned problems, and it is an object of the present invention to provide a combustion device in which clogging in the burner gun does not occur even when the burner operation is stopped.

<Summary of the Present Invention> In short, the present invention is a device configured to supply a cooling medium such as water to a path for supplying a medium such as steam for atomizing slurry fuel when the burner operation is stopped.

<Example> Examples of the present invention will be described below.

First, the entire configuration of the present invention will be explained using FIG. 1. The code 10 in the figure is a burner gun and the piping 17
is connected. A switching valve 16 is installed in the upstream part of this pipe 17, and water pipe 15 and steam pipe 11
is connected. 12 is a slurry pipe that supplies slurry fuel, 13 is an oil pipe, and 22 is a burner gun 10.
This is a pipe that supplies sealing air from around the area. Further, 1 is a boiler side wall, 2 is a wind box, 3 is an air register, 4 is a flame stabilizer, and 21 is a pipe for supplying combustion air to the wind box.

FIG. 2 shows the above device in more detail. 30 is a control device, which has a storage function and a control function. Reference numeral 31 is a valve control line, 32 is a pressure detection line, and 33 is a temperature detection line, all of which are connected to the control device 30. 41 is a flame detector and a signal line 42
A signal is input to the flame detector 40 via a line 34, and is further connected to the control device 30 via a line 34.

In the apparatus configured as described above, slurry fuel is normally supplied from the pipe 12, and is atomized and combusted by steam, which is an atomization medium, supplied by the switching valve 16. On the other hand, the presence or absence of a flame is input to the control device 30 through a flame detector 41, the pressure of the slurry through a pressure line, and the temperature of the burner gun 10 through a line 33 as signals. The burner gun temperature and slurry pressure during normal combustion are input in advance to the control device, and the control device compares and calculates the detected pressure, temperature, etc. in addition to the signal from the flame detection device. As a result, when it is determined that a burner trip has occurred, the switching valve 16 is immediately operated to stop the supply of steam, and the valve 35 is also closed to stop the supply of slurry. Furthermore, the switching valve 16 is operated to
5, water is supplied as a cooling medium into the burner gun 10 from the pipe 17 to cool the burner gun and prevent solidification of the slurry. Note that if the fuel can be purged into the furnace, this operation is of course performed, so the cooling operation is not performed. Control box 30 continuously monitors the cooling state of burner gun 10 via line 33 and adjusts the amount of water supplied.

Note that since the water is held in a state connected to the steam line, it is preferable that the temperature be raised to near the saturation temperature so that extreme pressure fluctuations due to condensation do not occur.

In addition, Figure 1 shows the slurry with oil piping attached.
Although the apparatus is of an oil-burning type, it is of course possible to configure it as a slurry fuel-only combustion apparatus.

<Effects> By carrying out the present invention, the slurry remaining in the burner does not solidify, and the burner can be reliably activated in both directions.

[Brief explanation of the drawing]

FIG. 1 is a fuel and coolant supply system diagram showing the entirety of the present invention, and FIG. 2 is a detailed diagram of the combustion device control system. 10... Burner gun, 11... Steam piping, 12
... Slurry pipe, 15 ... Water pipe, 16 ... Switching valve, 30 ... Control device, 32 ... Pressure detection line, 33 ... Burner gun temperature detection line, 41 ...
...flame detector.

Claims (1)

[Claims for Utility Model Registration] 1. In a device that atomizes slurry with an atomizing medium and burns it, a switching valve is attached to the pipe that supplies the atomizing medium to the burner gun, and a cooling medium is supplied to the switching valve. A slurry combustion device that prevents the slurry remaining in the burner gun from solidifying by connecting the supply pipe and supplying a cooling medium when the burner is stopped. 2 Utility Model Registration In the slurry combustion apparatus according to claim 1, a line for inputting the burner gun temperature, the presence or absence of flame, and the pressure inside the slurry pipe as signals is connected to the control device, and the switching valve and the slurry are connected to the control device. A valve installed in the supply piping and this control device are connected via a control signal line to automate the operation stop and cooling of the burner.