JP2008241078A - Clinker inhibiting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of inhibiting attachment and deposition of clinker by properly spraying a clinker inhibitor to a heat transfer face of a flue water pipe and a furnace wall heat transfer face of a waste incineration plant. <P>SOLUTION: An operation of a clinker inhibitor supply device is started to spray the clinker inhibitor from openings 4s of spray nozzles 4A-4C with a clinker inhibitor transferring medium. A flow velocity of the clinker inhibitor transferring medium is switched between strong blow and weak blow in spraying the clinker inhibitor with the transferring medium. In the strong blow, the clinker inhibitor is allowed to flow to a center side of a secondary combustion chamber 1, and then flow to an exhaust gas flowing toward a waste heat boiler 2 from the secondary combustion chamber 1 to be attached to an outer peripheral face of a water pipe constituting a group of flue water pipes 3. In the weak blow, the clinker inhibitor is allowed to flow along a wall surface of the secondary combustion chamber 1 by the flow of exhaust gas and reach a flue heat transfer face of the waste heat boiler 2 to be attached to the flue heat transfer face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clinker suppression method in a waste incineration plant, and in particular, clinker adhesion on flue water pipes and furnace wall heat transfer surfaces of heat exchange parts (waste heat boiler, super heater, air preheater) of the waste incineration plant. This is related to a method of suppressing corrosion, blockage, and heat transfer inhibition in the heat exchange section.

  In the exhaust gas line of the waste incineration plant, especially in these heat exchange parts (waste heat boiler, super heater, air preheater), the deposits derived from the components in the exhaust gas adhere, grow and accumulate, It causes various obstacles.

This adhesion phenomenon is caused by the reaction of waste-derived components and combustion aid components to produce a compound with a melting point lower than the ambient temperature, which melts and adheres to the inner walls of boilers and piping. This deposit causes various obstacles that hinder stable operation, such as heat transfer inhibition (decrease in heat exchange efficiency), pipe corrosion, and pipe blockage. Of these, deposits of the heat exchange unit is mainly SO _x in the exhaust gas, in particular by the SO ₂ is oxidized to _SO 3, SO _4, sulfuric acid compounds in the vicinity of the melting point 900 ° C. (such as Glauber's salt) is thermally This is considered to be due to melting and welding at the exchange part.

  Conventionally, in order to solve this problem, waste incineration facilities or the like regularly stop the operation and perform a cleaning operation in which an operator enters a boiler or the like to peel off and remove the deposits. However, this work requires a lot of labor and time, and there is also a problem of a decrease in heat recovery efficiency due to stopping the operation, and even if such cleaning is performed, pipe corrosion over time is prevented. In some cases, it was not possible.

Japanese Patent Application No. 2005-208734 discloses a method for suppressing deposits that cause such obstacles by using an exhaust gas treatment agent containing magnesium, iron or silicon, a flue, a boiler, an air preheater, a temperature reducing tower, or air heating. Injecting into a vessel is disclosed.
Japanese Patent Application No. 2005-208734

  The present invention provides a clinker inhibitor on the heat transfer surface of the flue water pipe and the heat transfer surface of the furnace wall at a location provided with both the flue water pipe and the furnace wall heat transfer surface in the exhaust gas flue of the waste incineration plant. It aims at providing the method of spraying appropriately and suppressing adhesion or accumulation of clinker.

  In the clinker suppression method of claim 1, the waste incineration plant includes both the flue water pipe and the furnace wall heat transfer surface in the flue gas flue, and the heat transfer surface of the flue water pipe and the furnace wall heat transfer surface On the other hand, a clinker suppression method in which clinker inhibitor is sprayed from a spray port by a transfer medium to prevent clinker adhesion or deposition, and when spraying the clinker inhibitor from the spray port, In addition, by switching the flow velocity of the transfer medium from the spray port, adhesion of the clinker to both the heat transfer surface of the flue water pipe and the heat transfer surface of the furnace wall is prevented.

  The clinker suppression method according to claim 2 is the clinker suppression method according to claim 1, wherein the clinker inhibitor is a powder, and the ejection flow rate of the transfer medium at the spray port is 15 m / s or more and 40 m / s or less in the case of strong blowing. In the case of weak blowing, it is 5 m / s or more and less than 15 m / s.

  According to a third aspect of the present invention, the waste incineration plant includes both the flue water pipe and the furnace wall heat transfer surface in the flue gas flue, and the heat transfer surface of the flue water pipe and the heat transfer surface of the furnace wall are provided. On the other hand, a clinker suppression method for preventing clinker adhesion or deposition by spraying a clinker inhibitor from a spray port with a transfer medium, the spray port being provided with a plurality of spray ports, It has a strong blowing spray port with a high flow rate and a weak blowing spray port with a slow blowing flow rate of the transfer medium, and can be switched simultaneously or mutually from both the strong blowing spray port and the weak blowing spray port. By spraying the clinker inhibitor, adhesion or deposition of the clinker on both the heat transfer surface of the flue water pipe and the heat transfer surface of the furnace wall is prevented.

  The clinker suppression method according to claim 4 is the clinker suppression method according to claim 3, wherein the clinker inhibitor is a powder, and an ejection flow rate of the transfer medium from the strong blowing spray port is 15 m / s or more and 40 m / s or less. The ejection flow rate of the transfer medium from the spraying nozzle for blowing is 5 m / s or more and less than 15 m / s.

  The clinker suppressing method according to claim 5 is the clinker suppressing method according to any one of claims 1 to 4, wherein the clinker suppressing agent is a powder containing a compound of Mg, Si, Ca or Al or a mixture containing two or more kinds of the powder. It is a powder.

  According to each invention of Claims 1-5, a clinker inhibitor can be sprayed to both the flue water pipe in an exhaust gas flue, and a furnace wall heat-transfer surface. Thereby, adhesion of clinker can be effectively suppressed in both the flue water pipe and the furnace wall heat transfer surface. That is, chemical adhesion prevention effect by modifying components in exhaust gas such as ash, physical peeling effect by degassing action of exhaust gas treatment agent, especially adhesion reduction by modifying sulfur oxide components The combined effects of reducing weldability due to melting point increase and improving brittleness (peelability) due to increased porosity of the adhering layer, make the deposits derived from exhaust gas components in waste incineration plants flue water pipes and furnace walls It is possible to effectively reduce adhesion to both of the heat transfer surfaces. As a result, it is possible to suppress heat transfer on the heat transfer surface of the flue water pipe and the heat transfer surface of the furnace wall, to suppress corrosion of the base material, and to prevent blockage in the plant due to clinker adhesion, and stable operation over a long period of time. Can be maintained.

  As in claim 2, the clinker inhibitor is powder, and the flow rate of the transfer medium at the spraying port is 15 m / s to 40 m / s in the case of strong blowing, and 5 m / s or more in the case of weak blowing. By setting it to less than 15 m / s, clinker adhesion to the flue water pipe and the furnace wall heat transfer surface can be sufficiently prevented.

  As described in claim 3, when a spray port for strong blowing in which the flow rate of the transfer medium of the clinker inhibitor is high and a spray port for weak blowing in which the flow rate of the transfer medium of the clinker inhibitor is slow are provided, as in claim 4. Preferably, the flow velocity of the transfer medium from the strong blowing spray port is 15 m / s or more and 40 m / s or less, and the flow velocity of the transfer medium from the weak blowing spray port is 5 m / s or more and less than 15 m / s. .

  In the present invention, the clinker inhibitor is preferably a powder containing a compound of Mg, Si, Ca or Al or a mixed powder containing two or more of the powders.

  In the present invention, it is preferable to confirm the clinker adhesion site in a preliminary survey and add a clinker inhibitor to a portion where clinker adhesion is remarkable.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic internal perspective side view of a part of an exhaust gas flue in a waste treatment plant, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is III in FIG. It is an expanded sectional view of a part.

  A waste heat boiler 2 is connected downstream of the secondary combustion chamber 1. Although not shown, the upstream side of the secondary combustion chamber 1 is connected to an incinerator, and the downstream side of the waste heat boiler 2 is connected to a chimney via various devices such as a flue and an electric dust collector.

  In the center of the waste heat boiler 2, a flue water pipe group 3 in which a plurality of water pipes are arranged is installed. A plurality of water tubes (not shown) are arranged along the inner wall surface of the waste heat boiler 2, and a furnace wall heat transfer surface is formed by the water tubes.

  Spray nozzles 4 </ b> A to 4 </ b> C are installed on the downstream side of the secondary combustion chamber 1.

  As shown in FIG. 3, the sleeve tube 5 is installed at the nozzle installation port provided on the wall surface of the secondary combustion chamber 1, and the flange portion of the spray nozzle 4C is fastened to the flange portion on the proximal end side of the sleeve tube 5. ing. The tips of the spray nozzles 4A to 4C are cut obliquely. The spray nozzles 4 </ b> A to 4 </ b> C are installed such that the opening (spray port) 4 s at the tip thereof faces the downstream side of the secondary combustion chamber 1. The other spray nozzles 4A and 4B are installed in the same manner. The spray nozzles 4A to 4C are connected to a clinker inhibitor supply device (not shown).

  The installation positions of the spray nozzles 4A to 4C are determined based on the result of visual confirmation of the clinker adhering site by the prior open inspection of the waste incineration plant, the operation data of the waste incineration plant, particularly the exhaust gas flow rate, pressure, temperature, etc. Identified based on.

  In a waste incineration plant, a component derived from waste and a combustion aid component react to form a compound having a low melting point, and this molten compound is used as a furnace wall heat transfer surface of a waste heat boiler 2 or a flue water pipe. By being welded to the group 3 and cooled, the clinker adheres to the furnace wall heat transfer surface and the flue water pipe group 3. For this reason, in this Embodiment, spray nozzle 4A-C is installed in the location nearest to the waste heat boiler 2 among the secondary combustion chambers 1. FIG.

  As described above, the spray nozzles 4 </ b> A to 4 </ b> C are attached to the wall surface of the secondary combustion chamber 1 by processing the nozzle installation port. However, when a substitute member, a flange for inspection, or the like is provided at the nozzle installation port, there is no particular need for processing.

  Examples of the clinker inhibitor used in the present invention include compounds such as Mg, Si, Ca, and Al.

Among these, MgCO ₃ , Mg (CH ₃ COO) ₂ , Mg (OH) ₂ , MgO, etc. as Mg-based clinker inhibitors, SiO ₂ etc. as Si-based clinker inhibitors as Ca-based clinker inhibitors Are CaO, Ca (OH) ₂ , CaCO ₃ , CaMg (CO ₃ ) _{2 and the} like, and Al-based clinker inhibitor includes Al ₂ O _{3 and the} like.

  The clinker suppressing effect of these active ingredients is as follows.

The clinker inhibitor suppresses deposits by a physical peeling action. That is, MgCO ₃ , Mg (CH ₃ COO) ₂ , Mg (OH) ₂ , Ca (OH) ₂ , CaCO ₃ , CaMg (CO ₃ ) ₂ are around 500 ° C., 300 ° C., 400 ° C., 600 ° C., respectively. In the vicinity of 700 ° C. and 850 ° C., it decomposes by heat, and in MgCO ₃ , Mg (CH ₃ COO) ₂ , CaCO ₃ , CaMg (CO ₃ ) _2, etc., CO ₂ gas is gradually released and Mg ( In (OH) ₂ and Ca (OH) ₂ , moisture is gradually released to produce MgO and CaO having a high melting point. Deposits can be peeled off by the degassing energy at that time. In addition, by intermittently injecting a large amount, a degassing reaction is performed in a state where the deposits are covered with these drugs, thereby forming a highly porous and non-weldable fragile layer. By being peeled off together with the deposit formed thereon, the deposit suppression effect can be obtained. Further, since CaO, MgO, SiO ₂ , and Al ₂ O ₃ originally have a high melting point and do not weld, by forming a fragile layer that is easily peeled off by these chemicals, the same peeling action as described above is achieved. Is obtained.

  One of these clinker inhibitors may be used alone, or two or more thereof may be mixed or used separately without mixing. The clinker inhibitor to be used can be appropriately selected according to the properties (temperature, oxygen concentration, sulfur concentration, etc.) of the exhaust gas. Speaking of the temperature of the addition site, it is preferable to select as shown in Table 1 in order to effectively obtain the addition effect.

  The form of the clinker inhibitor is not particularly limited, and may be a solid, for example, a powder having a particle diameter of about 5 to 10,000 nm, or dissolved or dispersed in a medium such as water to a concentration of about 5 to 60% by weight. It may be an aqueous solution or a dispersion.

  There is no particular limitation on the method of injecting the clinker inhibitor. For example, the powdered clinker inhibitor may be pumped by a compressor, a blower or the like, or the compressor, blower may be used even when existing cooling air or auxiliary combustion air is used. For example, it is possible to adopt a method of injecting the air into the cooling air, auxiliary air piping or soot blow line.

  The amount of the clinker inhibitor added is 0.001 to 10 wt% of the clinker inhibitor with respect to the waste and incineration fuel incinerated at the waste incineration plant, or 0.01 to 200 wt% of the clinker inhibitor with respect to the clinker deposit. % Addition is preferable. In particular, it is preferable to add a clinker inhibitor at 0.1 to 200 kg / hr. In addition, in order to improve dispersibility, you may use a dispersion nozzle as a spray nozzle.

  In the case of a liquid clinker inhibitor, the spray nozzle is not particularly limited as long as it can uniformly spray and inject the liquid clinker inhibitor, but preferably the spray liquid diameter is 2 to 2. A spray nozzle having a specification that can be uniformly added at 500 μm, a spray flow rate of 100 to 1000 L / hr, and a spray pressure of about 0.1 to 5.0 MPa is used.

  Next, a method for suppressing clinker adhesion in an exhaust gas flue having such a configuration will be described.

First, the operation of the waste incineration plant is started. There are no particular restrictions on the operating conditions of this waste incineration plant. For example, flue pressure -1 mmH ₂ O to -30 mmH ₂ O, exhaust gas flow rate 1 m / s to 10 m / s, preferably flue pressure -3 mmH ₂ O to The operation is performed under flue gas exhaust gas conditions of −10 mmH ₂ O and exhaust gas flow velocity of 2 m / s to 5 m / s.

  Moreover, the operation | movement of the clinker inhibitor supply apparatus which is not shown in figure is started, and a clinker inhibitor is sprayed from the opening (spray port) 4s of spray nozzle 4A-4C with the transfer medium of this clinker inhibitor. The operation of the clinker inhibitor supply device is usually started when the operation in the furnace is stabilized after the waste incineration plant is started up.

  When spraying the clinker inhibitor together with the transfer medium, the flow rate of the clinker inhibitor transfer medium is switched between strong blowing and weak blowing.

  At the time of strong injection, the clinker inhibitor flows into the center side of the secondary combustion chamber 1 and flows into the exhaust gas flowing from the secondary combustion chamber 1 toward the waste heat boiler 2 to form the flue water tube group 3. It is added to the outer peripheral surface.

  At the time of weak injection, the clinker inhibitor is caused to flow along the wall surface of the secondary combustion chamber 1 by the flow of exhaust gas, reaches the flue heat transfer surface of the waste heat boiler 2, and is added to the flue heat transfer surface. The

  The flow rate of the clinker inhibitor flowing out of the spray nozzles 4A to 4C and the transfer medium thereof is 15 m / s to 40 m / s in the case of strong blowing, and 5 m / s to less than 15 m / s in the case of weak blowing. Preferably there is.

  As a method for adding the clinker inhibitor, intermittent mass injection may be performed to the flue water tube group and the furnace wall heat transfer surface at a certain frequency while intermittent injection, continuous injection, or constant amount continuous injection is performed during operation of the facility. Whether the clinker inhibitor is a powder or a liquid drug, both the stock solution injection and the line injection can be performed. As a guideline for the addition time of the clinker inhibitor, intermittent injection or continuous injection of a predetermined amount is performed once a day at several minutes to several hours / time.

  In this way, the clinker inhibitor is added to both the flue water tube group 3 and the furnace wall heat transfer surface. Thereby, it becomes possible to effectively suppress the adhesion of the clinker to the flue water tube group 3 and the furnace wall heat transfer surface. As a result, blockage in the waste heat boiler 2 is prevented, heat transfer inhibition and corrosion at the flue water tube group 3 and the furnace wall heat transfer surface are suppressed, and as a result, stable operation can be maintained over a long period of time. Become.

  In the above embodiment, the spray nozzles 4A to 4C are used for both strong blowing and weak blowing. However, as shown in FIGS. 4 to 6, these spray nozzles 4A to 4C are used as strong blowing spray nozzles. The weak spray nozzles 4D to 4F may be provided separately.

  In this case, as shown in FIG. 3, the spray nozzles 4D to 4F for weak blowing are shaped so that the tip 4s is obliquely cut so as to face the downstream side in the gas flow direction, so that the clinker inhibitor It flows along the wall surface from the opening 4 c and is easily added to the furnace wall heat transfer surface of the waste heat boiler 2.

  In addition, it is preferable to use the spray nozzles 4A to 4C for strong blowing whose tip is perpendicular to the tube axis direction. In this case, the clinker inhibitor is easily added to the flue water pipe group 3 arranged on the center side of the waste heat boiler 2.

  4 is a schematic internal perspective side view showing a state where the installation positions of the spray nozzles are increased in FIG. 1, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and FIG. These are sectional drawings which follow the VI-VI line of FIG.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

<Outline of waste incineration plant>
As the waste incineration plant, a waste heat boiler (natural circulation boiler), a gas cooling facility, and a bag filter are provided on the downstream side of the incinerator, and the incineration capacity is 150 t / day. Moreover, the temperature of the exhaust gas which passes a waste-heat boiler is 800-900 degreeC.

<Preliminary survey>
The waste incineration plant was operated in advance, and then the state of deposits in the waste heat boiler was investigated. Further, the deposit was peeled off, and the composition of the deposit was analyzed by X-ray diffraction. The results are shown in Table 2. As a result of the analysis, the deposit was a clinker mainly composed of Na ₂ SO ₄ .

  In addition, the clinker was attached so as to cover the furnace wall heat transfer surface of the waste heat boiler and the outer surface of the pipe constituting the flue water pipe group. Based on the results of this preliminary investigation, spray nozzles 4A to 4F were installed at the positions shown in FIGS.

  In addition, as the spray nozzles 4D to 4F, as shown in FIG. 3, nozzles whose tip 4s was cut obliquely so as to be directed downstream in the gas flow direction (nozzle in FIG. 3) were used. In addition, as the spray nozzles 4A to 4C, nozzles having normal tips perpendicular to the tube axis direction (normal nozzles) were used.

Comparative Example 1
The waste incineration plant was operated without the addition of clinker inhibitors.

Comparative Example 2
The waste incineration plant was operated while adding the clinker inhibitor as follows.

Clinker inhibitor: 4MgCO ₃ .Mg (OH) ₂ .4H ₂ O
Spray nozzles used: Spray nozzles 4A to 4C (normal nozzles)
Clinker inhibitor addition amount: 10 kg / hr × 1.0 hr / time × 4 times / day
× Each spray nozzle Blower air flow rate: 22m / s (strong blow)

Comparative Example 3
The waste incineration plant was operated in the same manner as in Comparative Example 2 except that the blower air flow rate was 10 m / s (weak blowing).

Example 1
In Comparative Example 2, a decrease in the amount of steam generated and an increase in the waste heat boiler outlet temperature were observed 10 to 15 days after the start of operation.

  Therefore, in Example 1, the operation of the waste incineration plant was performed in the same manner as in Comparative Example 2 (strong blowing) until the ninth day after the start of operation, and Comparative Example 3 (weak blowing) from the tenth day. The waste incineration plant was operated in the same manner as above.

Example 2
In Comparative Example 3, the steam generation amount decreased and the waste heat boiler outlet temperature increased after 10 to 20 days had elapsed since the operation was started.

  Therefore, in Example 2, the operation of the waste incineration plant is performed in the same manner as in Comparative Example 3 (weak blowing) until the ninth day from the start of operation, and Comparative Example 2 (strong blowing) from the tenth day. The waste incineration plant was operated in the same manner as above.

Example 3
In Example 1, spray nozzles 4A to 4C (normal nozzles) were used regardless of whether the blower flow rate was 10 m / s (weak blowing) or 22 m / s (strong blowing). 3, spray nozzles 4D to 4F (nozzles in FIG. 3) were used when the blower flow rate was 10 m / s (weak blowing). Other than this, the waste incineration plant was operated in the same manner as in Example 1.

  That is, the operation of the waste incineration plant was performed in the same manner as in Comparative Example 2 (strong blow) from the start of operation until the ninth day.

  From the 10th day, the waste incineration plant was operated while adding the clinker inhibitor as follows.

Clinker inhibitor: 4MgCO ₃ .Mg (OH) ₂ .4H ₂ O
Spray nozzles used: Spray nozzles 4D to 4F (nozzles in FIG. 3)
Clinker inhibitor addition amount: 10 kg / hr × 1.0 hr / time × 4 times / day
× Each spray nozzle Blower air flow rate: 10m / s (weak blow)

Example 4
In Example 2, spray nozzles 4A to 4C (normal nozzles) were used regardless of whether the blower flow rate was 10 m / s (weak blowing) or 22 m / s (strong blowing). 4, spray nozzles 4D to 4F (nozzles in FIG. 3) were used when the blower flow rate was 10 m / s (weak blowing). Other than this, the waste incineration plant was operated in the same manner as in Example 2.

  That is, from the start of operation until the ninth day, the waste incineration plant was operated while adding the clinker inhibitor in the following manner.

Clinker inhibitor: 4MgCO ₃ .Mg (OH) ₂ .4H ₂ O
Spray nozzles used: Spray nozzles 4D to 4F (nozzles in FIG. 3)
Clinker inhibitor addition amount: 10 kg / hr × 1.0 hr / time × 4 times / day
× Each spray nozzle Blower air flow rate: 10m / s (weak blow)

  Also, from the 10th day, the waste incineration plant was operated in the same manner as in Comparative Example 2 (strong blow).

  Table 3 shows experimental conditions (nozzle type and blower air flow rate) of Comparative Examples 1 to 3 and Examples 1 to 4.

<Changes in steam generation amount of waste heat boiler and exhaust gas temperature at boiler outlet>
In Comparative Examples 1 to 3 and Examples 1 to 4, the transition of the amount of steam generated by the waste heat boiler is shown in FIG. 7 to FIG. 10 (a), and the transition of the exhaust gas temperature at the outlet of the waste heat boiler is the seventh. This is shown in FIG.

  In Comparative Examples 1 to 3 and Examples 1 to 4, the number of days in which continuous operation was possible when continuous operation was performed until the boiler outlet exhaust gas temperature reached 520 ° C. or higher was as follows. Thus, according to Examples 1 to 4, the continuous operation period could be extended.

Comparative Example 1: 26 days Comparative Example 2: 30 days Comparative Example 3: 26 days Example 1: 41 days Example 2: 45 days Example 3: 40 days Example 4: 42 days

<Open inspection>
In addition, after the above continuous operation period has elapsed, the waste incineration plant is stopped, the waste heat boiler is inspected for openness, and the appearance of the clinker adhesion on the furnace wall heat transfer surface of the waste heat boiler and the flue water pipe group is confirmed. It was. The results are shown in Table 4.

表４から明らかな通り、比較例１では、廃熱ボイラの炉壁伝熱面と煙道水管群のいずれにも、硬質なクリンカーが多量に付着していた。

As is clear from Table 4, in Comparative Example 1, a large amount of hard clinker was adhered to both the furnace wall heat transfer surface of the waste heat boiler and the flue water tube group.

  In Comparative Example 2, clinker adhesion to the flue water tube group was suppressed, but a large amount of clinker adhesion was seen on the furnace wall heat transfer surface. From this, it is presumed that the decrease in the amount of generated steam is caused by the heat exchange failure of the heat transfer tubes at the furnace wall heat transfer surface.

  On the other hand, in Comparative Example 3, clinker adhesion to the furnace wall heat transfer surface was suppressed, but a large amount of clinker adhesion was observed in the flue water tube group. From this, it is estimated that the decrease in the amount of steam generated is due to the heat exchange failure of the heat transfer tubes in the flue water tube group.

  In Examples 1 to 4, clinker adhesion was small in both the furnace wall heat transfer surface of the waste heat boiler and the flue water tube group, and the properties of the clinker were soft.

It is a typical internal perspective side view of a part of flue gas flue in a waste disposal plant. It is sectional drawing which follows the II-II line of FIG. It is an expanded sectional view of the III part of FIG. In FIG. 1, it is a typical internal see-through | perspective side view which shows the state which increased the installation location of the spray nozzle. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which follows the VI-VI line of FIG. (A) is a graph which shows transition of the steam generation amount by a waste heat boiler, (b) is a graph which shows transition of the exhaust gas temperature in the exit of a waste heat boiler. (A) is a graph which shows transition of the steam generation amount by a waste heat boiler, (b) is a graph which shows transition of the exhaust gas temperature in the exit of a waste heat boiler. (A) is a graph which shows transition of the steam generation amount by a waste heat boiler, (b) is a graph which shows transition of the exhaust gas temperature in the exit of a waste heat boiler. (A) is a graph which shows transition of the steam generation amount by a waste heat boiler, (b) is a graph which shows transition of the exhaust gas temperature in the exit of a waste heat boiler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Secondary combustion chamber 2 Waste heat boiler 3 Flue water pipe group 4A-4F Spray nozzle 4s Opening 5 Sleeve pipe

Claims (5)

A waste incineration plant has both flue water tubes and furnace wall heat transfer surfaces in the flue gas flue, and a clinker inhibitor is transferred to the heat transfer surfaces of the flue water tubes and the furnace wall heat transfer surfaces by a transfer medium. A clinker suppression method for preventing adhesion or accumulation of clinker by spraying from a spray port,
When spraying the clinker inhibitor from the spray port, the flow rate of the transfer medium from the spray port is switched between strong blowing and weak blowing, thereby allowing the heat transfer surface of the flue water pipe and the furnace wall A clinker-suppressing method, wherein adhesion of clinker to both heat transfer surfaces is prevented.   In Claim 1, the said clinker inhibitor is a powder, and the ejection flow velocity of the said transfer medium in the said spraying opening is 15 m / s or more and 40 m / s or less in the case of strong blowing, and in the case of weak blowing The clinker suppression method, wherein the clinker suppression method is 5 m / s or more and less than 15 m / s. A waste incineration plant has both flue water tubes and furnace wall heat transfer surfaces in the flue gas flue, and a clinker inhibitor is transferred to the heat transfer surfaces of the flue water tubes and the furnace wall heat transfer surfaces by a transfer medium. A clinker suppression method for preventing adhesion or accumulation of clinker by spraying from a spray port,
A plurality of the spray ports are provided,
The spray port has a strong spray spray port where the transfer medium is blown quickly and a weak blow spray port where the transfer medium is blown slowly.
By spraying the clinker inhibitor from both the strong blowing spray port and the weak blowing spray port simultaneously or mutually, spraying to both the heat transfer surface of the flue water pipe and the furnace wall heat transfer surface A method for suppressing clinker, characterized by preventing adhesion or deposition of clinker.   In Claim 3, The said clinker inhibitor is a powder, The jetting flow velocity of the transfer medium from the said strong blowing spray port is 15 m / s or more and 40 m / s or less, The transfer medium of the said weak blowing spray port A method for suppressing clinker, wherein an ejection flow velocity is 5 m / s or more and less than 15 m / s.   5. The clinker inhibitor according to claim 1, wherein the clinker inhibitor is a powder containing a compound of Mg, Si, Ca, or Al or a mixed powder containing two or more of the powders. Clinker suppression method.

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