JP7458180B2 - Shock wave soot blower system and its operating method - Google Patents

Description

The present invention relates to a system including a shock wave soot blower and a method of operating the same.

BACKGROUND ART Shock wave soot blowers have conventionally been used in devices such as boilers to remove dust adhering to equipment surfaces (for example, surfaces of superheaters) within the device (see, for example, Patent Document 1). This shock wave soot blower is configured to generate shock waves by burning a mixture containing fuel gas and oxidant gas, and to emit the shock waves into the internal space of the device. This shock wave removes dust from the equipment surfaces within the device.

In general, a shock wave soot blower includes a combustion chamber that mixes and burns fuel gas and oxidizing gas, a fuel gas filling tank that stores each of the fuel gas and oxidizing gas to be supplied to the combustion chamber, and Conventionally, gas is supplied to the combustion chamber by filling each filling tank with fuel gas and oxidizing gas until a predetermined set pressure value is reached, and then filling each filling tank with the fuel gas and oxidizing gas. of gas into the combustion chamber for a predetermined period of time (sufficient time for the pressure in each fill tank to reach equilibrium with the pressure in the combustion chamber).

Japanese Patent Application Publication No. 2005-172418

However, in a shock wave soot blower, the impact force of the shock wave output is determined by the pressure in the combustion chamber, whereas with the operating method described above, the pressure in the combustion chamber varies widely from the target value, making it difficult to precisely control the impact force.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to control the impact force output from a shock wave soot blower with high precision in order to solve the above problems.

In order to achieve the above-mentioned object, the shock wave type soot blower system according to the present invention has the following features:
A system including a shock wave soot blower that outputs shock waves by burning a mixture of fuel gas and oxidizing gas,
a combustion chamber that mixes and burns the fuel gas and the oxidant gas;
a soot blower main body having a discharge port that outputs a shock wave by discharging combustion gas generated in the combustion chamber;
a fuel supply source that supplies the fuel gas to the combustion chamber;
a fuel supply passage opening/closing valve provided in a fuel supply passage that supplies the fuel gas from the fuel supply source to the combustion chamber;
an oxidant supply source that supplies the oxidant gas to the combustion chamber;
an oxidant supply path opening/closing valve provided in an oxidant supply path that supplies the oxidant gas from the oxidant supply source to the combustion chamber;
The shock wave soot blower comprising:
a combustion chamber pressure measuring device that measures the pressure within the combustion chamber;
a valve control device that controls opening and closing of the fuel supply passage opening/closing valve and the oxidizing agent supply passage opening/closing valve according to the pressure value measured by the combustion chamber pressure measuring means;
Equipped with

Further, the method of operating the shock wave soot blower system according to the present invention includes:
opening the fuel supply passage opening/closing valve to supply the fuel gas from the fuel supply passage to the combustion chamber;
opening the oxidizing agent supply passage opening/closing valve to supply the oxidizing gas from the oxidizing agent supply passage to the combustion chamber;
a step of closing the fuel supply passage opening/closing valve and the oxidizing agent supply passage opening/closing valve when the pressure value measured by the combustion chamber pressure measuring device reaches a predetermined value;
including.

In a shock wave soot blower, the impact force output is determined by the pressure of the mixed gas in the combustion chamber at the start of combustion. According to the above system and operating method, the pressure inside the combustion chamber is directly measured and the supply amount of fuel gas and oxidant gas is controlled before combustion starts, making it possible to control impact force with extremely high precision. Become. This makes it possible to reliably perform work using impact force (for example, dust removal), and to avoid wasting operating costs due to outputting excessive impact force.

In the shock wave soot blower system according to an embodiment of the present invention, a fuel storage tank is provided between the fuel supply source and the combustion chamber to store the fuel gas, and a fuel storage tank is provided to measure the pressure inside the fuel storage tank. a storage tank pressure measuring device; an oxidant storage tank provided between the oxidant supply source and the combustion chamber for storing the oxidant gas; and an oxidant storage tank for measuring the pressure inside the oxidant storage tank. It may also be equipped with a pressure measuring device.

Also, how to operate this shock wave soot blower system:
When the pressure value measured by the fuel storage tank pressure measurement device falls below a predetermined value, replenishing the fuel gas from the fuel supply source until the pressure value reaches the predetermined value;
When the pressure value measured by the oxidant storage tank pressure measuring device falls below a predetermined value, replenishing the oxidant gas from the oxidant supply source until the pressure value reaches the predetermined value;
may be provided.

According to this configuration, since a storage tank whose pressure can be controlled is provided between the gas supply source and the combustion chamber, the system can be operated stably by maintaining each storage tank at a predetermined pressure or higher. becomes possible.

As described above, according to the present invention, it is possible to control the impact force output from the shock wave soot blower with high precision.

1 is a block diagram showing a schematic configuration of a shock wave soot blower system according to an embodiment of the present invention. 2 is a cross-sectional view showing the structure of a soot blower used in the shock wave soot blower system of FIG. 1 and its operation before combustion starts. 2 is a cross-sectional view showing the structure of a soot blower used in the shock wave soot blower system of FIG. 1 and its operation after combustion starts.

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 shows a schematic configuration of a shock wave soot blower system (hereinafter referred to as "SPS system") 1 according to an embodiment of the present invention. The SPS system 1 is installed, for example, in a boiler that uses exhaust heat from a waste incinerator as a heat source, and is used to remove dust attached to devices such as a superheater in the boiler using shock waves SP. However, the use of the SPS system 1 is not limited to this.

The SPS system 1 includes a shock wave soot blower (hereinafter simply referred to as "soot blower") 3, a combustion chamber pressure measuring device 5, and a valve control device 7.

The soot blower 3 outputs a shock wave SP by combusting a mixture of fuel gas F and oxidizing gas O and discharging combustion gas B generated thereby. In this embodiment, methane gas is used as the fuel gas F, and oxygen gas is used as the oxidant gas O. However, the fuel gas F and the oxidant gas O are not limited to these.

The soot blower 3 includes a combustion chamber 9 and a soot blower main body 11 integrated with the combustion chamber 9. The soot blower main body 11 is provided with a discharge port 13 for discharging the combustion gas B generated in the combustion chamber 9. The soot blower 3 further includes a fuel tank 15 as a fuel supply source and an oxidizer tank 17 as an oxidizer supply source. A fuel supply passage opening/closing valve 21 is provided in a fuel supply passage 19 that supplies fuel gas F from the fuel tank 15 to the combustion chamber 9 . An oxidant supply passage opening/closing valve 25 is provided in an oxidant supply passage 23 that supplies oxidant gas O from the oxidant tank 17 to the combustion chamber 9 .

In this embodiment, a fuel storage tank 27 is further provided between the fuel tank 15 and the combustion chamber 9, and an oxidizer storage tank 29 is provided between the oxidizer tank 17 and the combustion chamber 9. That is, a fuel storage tank 27 is provided midway through the fuel supply path 19 , and an oxidizer storage tank 29 is provided midway through the oxidizer supply path 23 . The fuel supply passage opening/closing valve 21 is arranged between the fuel storage tank 27 on the fuel supply passage 19 and the combustion chamber 9. Similarly, the oxidizing agent supply passage opening/closing valve 25 is arranged between the oxidizing agent storage tank 29 on the oxidizing agent supply passage 23 and the combustion chamber 9 .

The fuel storage tank 27 and the oxidizer storage tank 29 are respectively provided with a fuel storage tank pressure measurement device 31 and an oxidizer storage tank pressure measurement device 33 that measure the pressure inside each tank. Further, on-off valves 35 and 37 are also provided between the fuel tank 15 and the fuel storage tank 27 and between the oxidizer tank 17 and the oxidizer storage tank 29, respectively.

Here, the structure and operating principle of the soot blower 3 will be explained with reference to FIGS. 2A and 2B. In detail, the combustion chamber 9 provided integrally with the soot blower main body 11 includes a pair of main combustion chambers 41, 41 extending from both sides of the soot blower main body 11 perpendicularly to the discharge direction of the combustion gas B; It has a pre-combustion chamber 43 located between the combustion chambers 41, 41. A fuel supply passage 19 and an oxidizer supply passage 23 are connected to the pair of main combustion chambers 41 , 41 . A cylinder 45 is provided between the pair of main combustion chambers 41, 41. Inside the cylinder 45, a piston 47 is slidably provided on the inner peripheral wall of the cylinder 45. A nozzle 49 that forms a discharge port 13 for the combustion gas B is provided in a portion of the soot blower main body 11 facing the piston 47 . That is, the piston 47 is provided so as to be movable in the direction in which the combustion gas B is discharged.

A head 47 a provided at the rear end of the piston 47 (an end opposite to the discharge port 13 ) is in sliding contact with the inner circumferential wall of the cylinder 45 . A space between the head 47a of the piston 47 and the inner wall at the rear of the cylinder 45 is filled with pressing gas (nitrogen gas in this example) P for pressing the piston 47 forward. A portion of the inner space of the cylinder 45 in front of the head 47a of the piston 47 forms the preliminary combustion chamber 43. In the state shown in FIG. 2A before the start of combustion, the piston 47 closes the discharge port 13 due to the pressure of the pressurized gas P.

An ignition device 51 is provided in the preliminary combustion chamber 43 . The mixed gas of fuel gas F and oxidizing gas O introduced into the main combustion chamber 41 and flowing into the pre-combustion chamber 43 as shown in FIG. 2B is ignited by the ignition device 51, and the mixture is combusted in the pre-combustion chamber 43. When combustion starts, the piston 47 is pushed back rearward due to the pressure increase in the pre-combustion chamber 43, and the discharge port 13 is opened. While the discharge port 13 is open, combustion of the air-fuel mixture spreads from the pre-combustion chamber 43 to the entire main combustion chamber 41, and the combustion gas B generated thereby is discharged from the nozzle 49. A shock wave SP is output by this discharged combustion gas B.

Thus, in this embodiment, the piston 47 provided in the combustion chamber 9 and the pressurized gas P close the discharge port 13 of the combustion gas B before the start of combustion, and open the discharge port 13 after the start of combustion. An opening/closing mechanism 53 is constructed. However, the mode of the opening/closing mechanism 53 described here is only an example, and other modes of mechanisms may be used as long as they function in this manner.

The soot blower 3 generates the shock wave SP according to this operating principle, so the output impact force is determined by the mixed gas pressure in the combustion chamber 9 at the start of combustion. Therefore, in this embodiment, the combustion chamber 9 is provided with a combustion chamber pressure measuring device 5 that measures the pressure inside the combustion chamber 9. The combustion chamber pressure measuring device 5 is a pressure sensor that is designed to withstand the shock and temperature caused by the combustion that occurs inside the combustion chamber 9.

Next, we will explain how to operate the SPS system 1 configured in this way.

First, the valve control device 7 that controls the opening and closing of the valves opens the fuel supply passage opening/closing valve 21 to supply fuel gas F from the fuel supply passage 19 to the combustion chamber 9, and at the same time opens the oxidizer supply passage opening/closing valve 25. It is opened to supply oxidizing gas O from the oxidizing agent supply path 23 to the combustion chamber 9 . In this embodiment, fuel gas F and oxidant gas O are supplied to combustion chamber 9 from fuel storage tank 27 and oxidant storage tank 29, respectively. In this embodiment, the fuel gas F and the oxidizing gas O are supplied to the combustion chamber 9 at the same time.

In either case, gas is supplied to the combustion chamber 9 while monitoring the pressure inside the combustion chamber 9 using the combustion chamber pressure measuring device 5.

Thereafter, when the pressure value measured by the combustion chamber pressure measuring device 5 reaches a predetermined value, the valve control device 7 closes the fuel supply passage opening/closing valve 21 and the oxidizer supply passage opening/closing valve 25 to prevent the combustion chamber 9 from entering the combustion chamber 9. Stop gas supply. The predetermined value of the pressure in the combustion chamber 9 is a pressure value corresponding to a desired impact force. This predetermined value can be determined by, for example, preparing a map or function of the correspondence between the pressure value in the combustion chamber 9 at the start of combustion and the obtained impact force through a preliminary test. Determine based on.

Furthermore, in this embodiment, when the pressure value measured by the fuel storage tank pressure measurement device 31 falls below a predetermined value, the fuel gas F is replenished from the fuel tank 15 to the fuel storage tank 27 until the pressure value reaches the predetermined value. Similarly, when the pressure value measured by the oxidizing agent storage tank pressure measuring device 33 falls below a predetermined value, the oxidizing agent gas O is replenished from the oxidizing agent tank 17 to the oxidizing agent storage tank 29 until this predetermined value is reached. Such pressure control is performed by a second valve control device 55 provided on the fuel storage tank 27 side and a third valve control device 57 provided on the oxidizer storage tank 29 side. The predetermined value of the pressure in the fuel storage tank 27 and the oxidizer storage tank 29 refers to the period from when gas supply from each storage tank 27, 29 to the combustion chamber 9 starts until the pressure in the combustion chamber 9 reaches the predetermined value. This is a pressure value that can reliably cover the necessary supply amount.

In this way, the SPS system 1 can be operated by providing the pressure-controllable storage tanks 27, 29 between each supply source 15, 17 and the combustion chamber 9, and maintaining each storage tank 27, 29 at a predetermined pressure or higher. It is preferable to provide storage tanks 27 and 29, since stable operation is possible. However, each storage tank may be omitted, and the fuel gas F and the oxidant gas O may be directly supplied to the combustion chamber 9 from the fuel tank 15 and the oxidizer tank 17, respectively.

After the gas supply to the combustion chamber 9 is completed, the mixed gas is combusted in the combustion chamber 9 by, for example, the method described in conjunction with FIGS. 2A and 2B, and a shock wave SP is output.

According to the shock wave soot blower system 1 and its operating method according to the present embodiment described above, the pressure inside the combustion chamber 9 is directly measured and the gas supply amount before the start of combustion is controlled based on this measured value. It becomes possible to control impact force with extremely high precision. This makes it possible to reliably perform work using impact force (for example, dust removal), and to avoid wasting operating costs due to outputting excessive impact force.

As mentioned above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, changes, or deletions can be made without departing from the spirit of the present invention. Therefore, such materials are also included within the scope of the present invention.

1 Shock wave soot blower system 3 Shock wave soot blower 5 Combustion chamber pressure measuring device 7 Valve control device 9 Combustion chamber 11 Soot blower body 13 Discharge port 15 Fuel tank (fuel supply source)
17 Oxidizer tank (oxidant supply source)
19 Fuel supply path 21 Fuel supply path opening/closing valve 23 Oxidizing agent supply path 25 Oxidizing agent supply path opening/closing valve 27 Fuel storage tank 29 Oxidizing agent storage tank B Combustion gas F Fuel gas O Oxidizing gas SP Shock wave

Claims (4)

A system including a shock wave soot blower that outputs shock waves by burning a mixture of fuel gas and oxidizing gas,
a combustion chamber that mixes and burns the fuel gas and the oxidant gas;
a soot blower main body having a discharge port that outputs a shock wave by discharging combustion gas generated in the combustion chamber;
a fuel supply source that supplies the fuel gas to the combustion chamber;
a fuel supply passage opening/closing valve provided in a fuel supply passage that supplies the fuel gas from the fuel supply source to the combustion chamber;
an oxidant supply source that supplies the oxidant gas to the combustion chamber;
an oxidant supply path opening/closing valve provided in an oxidant supply path that supplies the oxidant gas from the oxidant supply source to the combustion chamber;
The shock wave soot blower comprising:
a combustion chamber pressure measuring device that measures the pressure within the combustion chamber;
Valve control for controlling opening and closing of the fuel supply passage opening/closing valve and the oxidizing agent supply passage opening/closing valve so that the pressure value measured by the combustion chamber pressure measuring device reaches a predetermined value corresponding to the desired impact force of the shock wave. a device;
Equipped with
A shock wave soot blower system , wherein gas is supplied to the combustion chamber while monitoring the pressure inside the combustion chamber using the combustion chamber pressure measuring device . The shock wave soot blower system according to claim 1,
a fuel storage tank provided between the fuel supply source and the combustion chamber and storing the fuel gas;
a fuel storage tank pressure measuring device that measures the pressure within the fuel storage tank;
an oxidant storage tank that is provided between the oxidant supply source and the combustion chamber and stores the oxidant gas;
an oxidizing agent storage tank pressure measuring device that measures the pressure within the oxidizing agent storage tank;
Shock wave soot blower system. A method of operating the shock wave soot blower system according to claim 1 or 2, comprising:
opening the fuel supply passage opening/closing valve to supply the fuel gas from the fuel supply passage to the combustion chamber;
opening the oxidizing agent supply passage opening/closing valve to supply the oxidizing gas from the oxidizing agent supply passage to the combustion chamber;
a step of closing the fuel supply passage opening/closing valve and the oxidizing agent supply passage opening/closing valve when the pressure value measured by the combustion chamber pressure measuring device reaches a predetermined value;
How to operate a shock wave soot blower system equipped with In the operating method according to claim 3, which refers to claim 2,
When the pressure value measured by the fuel storage tank pressure measurement device falls below a predetermined value, replenishing the fuel gas from the fuel supply source until the pressure value reaches the predetermined value;
When the pressure value measured by the oxidizer storage tank pressure measuring device falls below a predetermined value, replenishing the oxidant gas from the oxidizer supply source until the pressure value reaches the predetermined value;
How to operate a shock wave soot blower system equipped with

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