JP2010249379A - Soot blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soot blower device capable of suppressing generation of drainage and reducing the number of times of warming. <P>SOLUTION: This soot blower device includes a steam circulation piping section 2 connected to a boiler at its basic end side for circulating the steam produced by the boiler, steam injecting sections 4a, 4b connected to a tip end side of the steam circulation piping section 2 and injecting the steam to elements 182a, 182b, a steam discharge piping section 6 connected to an upstream side of the steam injecting sections 4a, 4b, of the steam circulation piping section 2 at its one end side, and opened at the other end side, first valves 23a, 23b disposed near connecting sections of the steam circulation piping section 2 and the steam injecting sections 4a, 4b, a second valve 61 disposed on the steam discharge piping section 6, a temperature measuring section 22 for measuring a temperature of the steam circulated in the steam circulation piping section 2, and a control section 8 controlling the opening/closing of the first valves 23a, 23b and the second valve 61 on the basis of the steam temperature measured by the temperature measuring section 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a soot blower device.

In general, in a thermal power plant, water is evaporated by a boiler to generate high-pressure steam, and the turbine is rotated by this high-pressure steam to generate power.
Thus, in a thermal power plant, a boiler is used to generate power, and coal or the like is used as fuel for the boiler. Therefore, when steam is generated by the boiler, the exhaust gas is discharged by burning fuel such as coal.

  Since the exhaust gas is hot, it is sent to an air preheater for heat exchange before being discharged to the outside. The air preheater includes a heat exchanger having an element for storing fluid heat, and when the exhaust gas passes through the air preheater, the heat of the exhaust gas is transferred to the element and stored. The Moreover, the air preheater is comprised so that the air supplied to a boiler may distribute | circulate, and the heat accumulated in the element is transferred to the air supplied to the boiler. In this way, heat exchange is performed on the air sent from the exhaust to the boiler.

  By the way, combustion ash is contained in exhaust gas. For this reason, combustion ash may block the element while exhaust gas is repeatedly passed through the element. When the element is blocked, there is a problem that the exhaust gas cannot pass through the air preheater and the power generation performance in the thermal power generation facility is deteriorated.

  In response to this, a soot blower device is disclosed in which a part of high-pressure steam generated in a boiler is injected onto an element of an air preheater to remove combustion ash adhering to the element (for example, Patent Document 1). reference).

Japanese Patent Application No. 60-33056

  However, the steam sprayed by the soot blower device generates drainage if the temperature is too low. When the drain is generated, the element of the air preheater is wetted by the drain, and the combustion ash easily adheres to the element. That is, there is a possibility of promoting the blockage of the element. Therefore, it is necessary to maintain a certain level of high temperature for the steam injected by the soot blower device.

  On the other hand, the flow path provided to send the steam to the soot blower device circulates the steam only when the soot blower device is operated, and therefore remains in a cooled state for a while after the steam starts to circulate. Therefore, conventionally, in order to supply high-temperature steam to the soot blower device, an operation of warming the flow path by circulating the steam through the flow path for a predetermined time has been performed (hereinafter referred to as “warming”).

  However, the steam used for warming is steam having a high water quality equivalent to that of pure water used for generating steam in the boiler. The use of a large amount of such high-quality steam for warming results in wasteful drainage of a large amount of steam, which is not preferable from the viewpoint of resource saving.

  An object of this invention is to provide the soot blower apparatus which can suppress generation | occurrence | production of drain and can reduce the frequency | count of warming.

  According to the present invention, steam supplied from a boiler is jetted onto an element that is disposed in a flow path through which a fluid flows and passes the fluid flowing through the flow path to remove foreign substances contained in the fluid. A soot blower device for removing foreign matter adhering to an element, a base end side of which is connected to the boiler, and a steam circulation pipe part through which the steam generated by the boiler flows, and a tip side of the steam circulation pipe part A steam injection part for injecting the steam to the element, a steam discharge pipe part having one end side connected to the upstream side of the steam injection part in the steam circulation pipe part, and the other end side being opened, and the steam circulation pipe A first valve provided in the vicinity of a connection portion between the steam injection portion and the steam injection portion; a second valve provided in the steam discharge piping portion; and a temperature of steam flowing through the steam circulation piping portion. A degree measurement unit, based on the temperature of the steam which has been measured by the temperature measuring unit, a control unit for controlling the opening and closing of said first valve and said second valve to a sootblower device comprising a.

  In addition, the soot blower device further includes a bypass pipe portion having one end side connected to the upstream side of the second valve in the steam discharge pipe portion and the other end side connected to the downstream side of the second valve in the steam discharge pipe portion. Preferably, the bypass pipe part is provided with a moisture discharge part for discharging moisture generated from the steam flowing through the steam circulation pipe part and the steam discharge pipe part.

  Further, the control unit closes the first valve and opens the second valve when the vapor temperature measured by the temperature measurement unit is equal to or lower than a predetermined temperature, and is measured by the temperature measurement unit. When the temperature of the steam is equal to or higher than a predetermined temperature, it is preferable that the first valve is opened after the second valve is closed.

  In addition, the soot blower device includes a first pressure measuring unit that measures the pressure of the fluid flowing into the element provided on the upstream side of the element in the flow path, and the downstream side of the element in the flow path. A second pressure measuring unit that measures the pressure of the fluid that has passed through the element; and a third valve that is provided in the vicinity of a proximal end portion of the steam circulation pipe unit, wherein the control unit includes the first pressure measuring unit. Preferably, the third valve is opened when a differential pressure between the pressure measured by the unit and the pressure measured by the second pressure measurement unit is equal to or greater than a predetermined differential pressure.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing generation | occurrence | production of drain, the soot blower apparatus which can reduce the frequency | count of warming can be provided.

It is the schematic which shows the outline of the thermal power generation equipment by which the soot blower apparatus which concerns on this embodiment was arrange | positioned. It is the schematic which shows the steam flow of the soot blower apparatus which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a schematic configuration of a thermal power generation facility 100 as a steam power generation facility in which the soot blower device 1 according to the present embodiment is disposed will be described.
FIG. 1 is a schematic diagram showing an outline of a thermal power generation facility 100 in which a soot blower device 1 according to the present embodiment is disposed.

  As shown in FIG. 1, the thermal power generation facility 100 generates a rotational force by a crude oil storage tank 150 that stores crude oil (fuel), a boiler 110 that burns crude oil to generate steam, and steam generated by the boiler 110. Turbine 120 to be generated, generator 130 for converting the rotational force generated in turbine 120 into electric energy, transformer equipment 140 for converting the generated power into high voltage, ventilator 160 for sending air to boiler 110, and glass smoke The apparatus 170, the air preheater 180 which performs heat exchange, the soot blower apparatus 1, the electrostatic precipitator 190, and the chimney 200 are provided.

  Crude oil stored in the crude oil storage tank 150 is supplied to the burner 111 provided in the boiler 110 and burned by the burner 111. Inside the boiler 110, a water pipe 112 through which irrigation water passes is disposed. When the water pipe 112 is heated by the burner 111, steam is generated inside the water pipe 112.

  Steam generated inside the water pipe 112 is sent to the turbine 120. The steam sent to the turbine 120 gives a rotational force to the turbine 120 and is converted into electric energy by the generator 130.

  On the other hand, the steam that has passed through the turbine 120 is sent to the boiler 110 again. The steam sent to the boiler 110 is reheated by a reheater 113 disposed inside the boiler 110. The steam reheated by the reheater 113 is sent to the turbine 120 again.

  Air for burning the crude oil by the burner 111 is introduced from the atmosphere by the ventilator 160. The ventilator 160 first sends air into the blower pipe 161. The air sent into the blower pipe 161 is subjected to heat exchange (preheating) by a first heat exchanger 181a and a second heat exchanger 181b (see FIG. 2) provided in the air preheater 180, and the boiler. 110. The air supplied to the boiler 110 is used for burning crude oil in the burner 111.

  Exhaust gas as a fluid generated along with combustion of crude oil inside the boiler 110 is sent to the reheater 113. The exhaust gas sent to the reheater 113 is sent to the glass smoke device 170, and the toxic gas is absorbed by the glass smoke device 170. The exhaust gas in which the toxic gas is absorbed is sent to the air preheater 180.

The air preheater 180 includes a first heat exchanger 181a and a second heat exchanger 181b (see FIG. 2). The first heat exchanger 181a (second heat exchanger 181b) includes a first element 182a (second element 182b) formed in a cylindrical shape to which the heat of the fluid is transferred by circulating the fluid, and a boiler 110. A boiler flow path for flowing supplied air to the first element 182a (second element 182b), and an exhaust flow path for flowing exhaust discharged from the boiler 110 to the first element 182a (second element 182b). Prepare.
The first element 182a (second element 182b) has a portion through which the air supplied to the boiler 110 passes and a portion through which the exhaust discharged from the boiler 110 passes inside the first element 182a (second element 182b). It is rotatably arranged inside the first heat exchanger 181a (second heat exchanger 181b) so as to be variable.

  In the air preheater 180, the exhaust gas discharged from the boiler 110 is passed through the first heat exchanger 181a and the second heat exchanger 181b, and the heat of the exhaust gas is stored in the first element 182a and the second element 182b (from the exhaust gas). In addition, the air introduced from the atmosphere is passed, and the heat stored in the first element 182a and the second element 182b is transferred to the air (preheating the air).

  The exhaust gas heat exchanged by the air preheater 180 is sent to the electric dust collector 190. The exhaust gas sent to the electrostatic precipitator 190 collects particles in the exhaust by the electrostatic precipitator 190 and is released from the chimney 200 to the atmosphere.

Next, the soot blower device 1 according to the present embodiment will be described.
The soot blower device 1 removes combustion ash as deposits included in the exhaust gas attached to the first element 182a and the second element 182b (see FIG. 2) of the first heat exchanger 181a and the second heat exchanger 181b.

FIG. 2 is a schematic diagram showing a steam flow of the soot blower device 1 according to the present embodiment.
As shown in FIG. 2, the soot blower device 1 includes a steam circulation pipe section 2, a steam stop valve 21, a temperature measurement section 22, first valves 23 a and 23 b, orifices 24 a and 24 b, and pressure gauges 25 a and 25 b. The steam injection parts 4a and 4b, the first pressure measurement part 50, the second pressure measurement parts 51a and 51b, the steam discharge pipe part 6, the second valve 61, the bypass pipe part 7 and the moisture discharge part. 70 and a control unit 8.

The steam circulation piping part 2 has a proximal end connected to the boiler 110 (not shown) and a distal end branched to one side and the other side. The steam generated in the boiler 110 circulates in the steam circulation piping part 2.
The steam stop valve 21 as a third valve is provided in the vicinity of the proximal end portion of the steam circulation pipe part 2 and opens or closes the steam circulation pipe part 2. That is, when the steam stop valve 21 is opened, steam is circulated through the steam circulation pipe part 2, and when the steam stop valve 21 is closed, the steam circulation to the steam circulation pipe part 2 is stopped.
The temperature measuring unit 22 is provided on the downstream side of the steam stop valve 21 in the steam circulation piping unit 2 and on the upstream side of the branch point. The temperature measurement unit 22 measures the temperature of the steam flowing through the steam flow piping unit 2.

The first valve 23 a is provided on one branched side of the steam circulation pipe part 2. The first valve 23a closes or opens one branched side of the steam flow pipe section 2. That is, when the first valve 23a is opened, the steam is circulated to one side where the steam circulation pipe part 2 is branched, and when the first valve 23a is closed, the steam is circulated to one side where the steam circulation pipe part 2 is branched. Stopped.
Similarly, the first valve 23 b is provided on the other branched side of the steam circulation pipe part 2. The first valve 23b closes or opens the other branched side of the steam flow pipe section 2. That is, when the first valve 23b is opened, the steam is circulated to the other branched side of the steam circulation piping part 2, and when the first valve 23b is closed, the steam is circulated to the other branched side. Stopped.

The orifice 24 a and the pressure gauge 25 a are provided on the downstream side of the first valve 23 a on one side where the steam circulation pipe portion 2 is branched. The orifice 24a and the pressure gauge 25a adjust the vapor pressure flowing through one branched side of the vapor circulation pipe section 2. For example, the vapor pressure is adjusted to 12 kg / cm ² .
The orifice 24b and the pressure gauge 25b are provided on the downstream side of the first valve 23b on the other branched side of the steam flow pipe section 2. The orifice 24b and the pressure gauge 25b adjust the vapor pressure flowing through the other branched side of the vapor circulation pipe section 2. For example, the vapor pressure is adjusted to 12 kg / cm ² .

The steam injection part 4 a is connected to the branched one end of the steam circulation pipe part 2. The steam injection unit 4a is disposed so that the injection port faces the first element 182a of the first heat exchanger 181a, and injects steam to the first element 182a.
The steam injection part 4 b is connected to the tip of the other side of the steam distribution pipe part 2 that is branched. The steam injection unit 4b is disposed so that the injection port faces the second element 182b of the second heat exchanger 181b, and injects steam to the second element 182b.

The first pressure measurement unit 50 is provided on the upstream side of the first element 182a of the first heat exchanger 181a and the second element 182b of the second heat exchanger 181b in the exhaust flow path flowing into the air preheater 180. It has been. The first pressure measuring unit 50 measures the pressure of the exhaust gas flowing into the first element 182a and the second element 182b.
The second pressure measuring units 51a and 51b are downstream of the first element 182a of the first heat exchanger 181a and the second element 182b of the second heat exchanger 181b in the exhaust flow path flowing into the air preheater 180. Is provided. The second pressure measuring units 51a and 51b measure the pressure of the exhaust gas that has passed through the first element 182a and the second element 182b.

The steam discharge piping part 6 is connected to the distal end of the other side where the base end of the steam circulation piping part 2 is branched. On the other hand, the tip of the steam discharge piping part 6 is open.
The second valve 61 is provided in the steam discharge pipe section 6 and closes or opens the steam discharge pipe section 6. That is, when the second valve 61 is opened, the steam is circulated through the steam discharge pipe section 6, and when the second valve 61 is closed, the circulation of the steam to the steam discharge pipe section 6 is stopped.

One end side of the bypass pipe part 7 is connected to the upstream side of the second valve 61 in the steam discharge pipe part 6, and the other end side is connected to the downstream side of the second valve 61 in the steam discharge pipe part 6.
The moisture discharge unit 70 includes a drain trap 71, a valve 72 provided on the upstream side of the drain trap 71, and a valve 73 provided on the downstream side of the drain trap 71.
The drain trap 71 captures and discharges moisture contained in the steam from the steam flowing through the steam discharge piping unit 6.

The control unit 8 is electrically connected to the steam stop valve 21, the temperature measurement unit 22, the first valves 23 a and 23 b, the first pressure measurement unit 50, the second pressure measurement units 51 a and 51 b, and the second valve 61. .
The control unit 8 controls the opening and closing of the first valves 23 a and 23 b and the second valve 61 based on the temperature measured by the temperature measuring unit 22. The control unit 8 also controls the pressure of the exhaust gas flowing into the first element 182a and the second element 182b measured by the first pressure measuring unit 50 and the first element 182a measured by the second pressure measuring units 51a and 51b. And the opening and closing of the steam stop valve 21 is controlled based on the differential pressure with the pressure of the exhaust gas that has passed through the second element 182b. That is, the control unit 8 controls the steam injected to the first element 182a and the second element 182b.

Next, the operation of the soot blower device 1 according to this embodiment will be described.
In the initial state, all the valves are assumed to be closed.
The pressure of the exhaust gas flowing into the first element 182a and the second element 182b measured by the first pressure measuring unit 50, and the first element 182a and / or the second element 182b measured by the second pressure measuring units 51a and 51b. When the differential pressure with the pressure of the exhaust gas that has passed through becomes greater than or equal to a predetermined differential pressure, the control unit 8 opens the steam stop valve 21.

  When the steam stop valve 21 is opened, steam is circulated from the boiler 110 to the steam circulation piping part 2. When steam is circulated from the boiler 110 to the steam circulation piping part 2, the temperature of the steam is measured by the temperature measuring part 22 provided on the downstream side of the steam stop valve 21.

  When the temperature measured by the temperature measurement unit 22 is equal to or lower than a predetermined temperature (for example, 215 ° C.), the control unit 8 opens the second valve 61. When the second valve 61 is opened, the steam is circulated through the steam discharge pipe section 6. The steam circulated through the steam exhaust pipe section 6 is exhausted from the front end side of the steam exhaust pipe section 6 (for example, for 20 minutes) until the temperature measured by the temperature measuring section 22 reaches a predetermined temperature or higher.

  When the temperature measured by the temperature measurement unit 22 becomes equal to or higher than a predetermined temperature, the control unit 8 first opens the valve 72 and the valve 73 of the bypass pipe unit 7 and closes the second valve 61. The valve 72 and the valve 73 are opened for a predetermined time (for example, 2 minutes). When the second valve 61 is closed and the valve 72 and the valve 73 are opened, the steam is circulated through the bypass pipe portion 7. In the bypass piping section 7, drain (water) contained in the steam is captured by the drain trap 71 and the captured drain is discharged to the outside.

  When a predetermined time (for example, 2 minutes) elapses after the second valve 61 is closed and the valve 72 and the valve 73 are opened, the control unit 8 opens the first valves 23a and 23b, and the valve 72 and the valve 73. Close.

  When the first valves 23a and 23b are opened and the valve 72 and the valve 73 are closed, the steam is circulated to one side where the steam circulation pipe part 2 is branched and the other side where the steam circulation pipe part 2 is branched. On one side where the steam circulation pipe part 2 is branched and on the other side where the steam circulation pipe part 2 is branched, the steam is adjusted to a predetermined pressure by the orifices 24a and 24b, and by the steam injection parts 4a and 4b provided at the tips. The steam is injected into the first element 182a and the second element 182b.

By injecting steam to the first element 182a and the second element 182b, the difference between the exhaust pressure measured by the first pressure measurement unit 50 and the exhaust pressure measured by the second pressure measurement units 51a and 51b. When the pressure becomes a predetermined differential pressure or less, the control unit 8 closes the steam stop valve 21 and closes the first valves 23a and 23b. That is, the steam injection is stopped.
In the soot blower device 1, the above operation is sequentially repeated by the control unit 8.

According to the soot blower device 1 according to the present embodiment having the above-described configuration, the following effects are exhibited.
The soot blower device 1 according to the present embodiment injects steam to the first element 182a and the second element 182b based on the temperature of the steam flowing through the steam circulation pipe section 2. Therefore, the discharge of the drain from the steam injection units 4a and 4b is suppressed, and the first element 182a and the second element 182b of the air preheater 180 can be suppressed from being wet by the drain. As a result, it is possible to suppress the combustion ash from adhering to the first element 182a and the second element 182b, and it is possible to suppress the blockage of the first element 182a and the second element 182b.

  Moreover, since the discharge of the drain from the steam injection parts 4a and 4b is suppressed in the soot blower device 1, for example, the first element 182a and the second element 182b are damaged by the initial drain or the like (for example, the end of the low temperature element). Cracks and the like) can be suppressed.

  In addition, the soot blower device 1 injects steam to the first element 182a and the second element 182b based on the differential pressure between the exhaust pressure on the upstream side and the downstream side of the first element 182a and the second element 182b. Therefore, it is possible to inject steam only when a predetermined amount of combustion ash or the like adheres to the first element 182a and the second element 182b and the exhaust gas hardly passes through the first element 182a and the second element 182b. . As a result, the number of warming times of the soot blower device 1 can be reduced. In addition, the soot blower device 1 can be disposed without affecting the stable operation of the air preheater 180.

In addition, this invention is not limited to the said embodiment at all, and the technical scope of this invention is not limited to these.
For example, in the present embodiment, the first valve 23a, 23b and the second valve 61 are opened and closed based on the temperature of the steam flowing through the steam flow piping part 2 measured by the temperature measurement part 22, but the temperature In addition to the temperature measured by the measurement unit 22, the first valves 23a and 23b and the second valve 61 may be opened and closed based on the pressure of the steam flowing through the steam flow piping unit 2.

DESCRIPTION OF SYMBOLS 1 Soot blower apparatus 2 Steam distribution piping part 4 Steam injection part 6 Steam discharge piping part 7 Bypass piping part 8 Control part 22 Temperature measurement part 23a, 23b 1st valve 50 1st pressure measurement part 51a, 51b 2nd pressure measurement part 61 1st 2-valve 100 Thermal power generation facility (steam power generation facility)
110 Boiler 182a (182b) First element (second element)

Claims (4)

Vapor supplied from a boiler was sprayed onto an element that is disposed in a flow path through which the fluid flows and passes the fluid flowing through the flow path to remove foreign substances contained in the fluid, and adhered to the element A soot blower device for removing foreign matter,
A steam flow piping section in which a base end side is connected to the boiler and the steam generated by the boiler flows;
A steam injection part connected to the tip end side of the steam circulation pipe part and injecting the steam to the element;
One end side is connected to the upstream side of the steam injection part in the steam circulation pipe part, the other end side is opened steam discharge pipe part,
A first valve provided in the vicinity of a connection portion between the steam circulation pipe section and the steam injection section;
A second valve provided in the steam discharge piping section;
A temperature measuring unit for measuring the temperature of the steam flowing through the steam circulation piping unit;
A soot blower device comprising: a control unit that controls opening and closing of the first valve and the second valve based on the temperature of the steam measured by the temperature measurement unit. One end side is further connected to the upstream side of the second valve in the steam discharge pipe part, and the other end side further includes a bypass pipe part connected to the downstream side of the second valve in the steam discharge pipe part,
2. The soot blower device according to claim 1, wherein the bypass piping unit is provided with a moisture discharging unit that discharges moisture generated from steam flowing through the steam circulation piping unit and the steam discharging piping unit.   The control unit closes the first valve and opens the second valve when the temperature of the steam measured by the temperature measurement unit is equal to or lower than a predetermined temperature, and the steam measured by the temperature measurement unit. The soot blower device according to claim 1 or 2, wherein the first valve is opened after the second valve is closed when the temperature of the first valve becomes equal to or higher than a predetermined temperature. A first pressure measuring unit that measures the pressure of the fluid flowing into the element provided on the upstream side of the element in the flow path;
A second pressure measuring unit that measures the pressure of the fluid that has passed through the element provided on the downstream side of the element in the flow path;
A third valve provided in the vicinity of a base end portion of the steam circulation pipe portion,
The control unit opens the third valve when a differential pressure between a pressure measured by the first pressure measurement unit and a pressure measured by the second pressure measurement unit is equal to or higher than a predetermined differential pressure. Item 4. The soot blower device according to any one of Items 1 to 3.

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