JP2006057894A - Boiling/atomizing nozzle for exhaust gas temperature-decreasing device for spraying pressurized hot water and spray method of pressurized hot water using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boiling/atomizing nozzle capable of remarkably enhancing temperature decreasing efficiency by always stably spraying hot water in a good state from a hot water spray nozzle, in an exhaust gas temperature-decreasing system using hot water. <P>SOLUTION: In relation to a boiling/atomizing nozzle for an exhaust gas temperature-decreasing device for spraying pressurized hot water at a temperature higher than the boiling point of water under atmospheric pressure, this boiling/atomizing nozzle for an exhaust gas temperature-decreasing device is composed of: a nozzle tip 11 having, in its inside, a rotor insertion part 12a and a hot water jetting port 12c communicating with it; and the rotor 15 rotatably inserted into the rotor insertion part 12a, and composed by drilling a linear single hole 15 at its center and by spirally forming a turning groove 15a on its peripheral surface; and is used for spraying pressurized hot water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of an exhaust gas temperature reduction system using hot water, and is intended for an exhaust gas temperature reduction device that sprays pressurized hot water that can efficiently reduce the temperature of exhaust gas in a more stable state. The present invention relates to a boiling atomization nozzle and a method of spraying hot water using the same.

  In general, combustion exhaust gas discharged from a waste incinerator, a waste melting furnace, a boiler combustion device, etc. is cooled to a predetermined temperature, then purified by a gas purification device, and diffused into the atmosphere.

  In addition, as the exhaust gas temperature reduction system, a so-called one-fluid system (pressurized water) and a two-fluid system (compressed fluid + pressurized water), which sprays room temperature water into the exhaust gas, have been used in recent years. An exhaust gas temperature reduction system in which pressurized hot water having a temperature higher than the boiling point of water under atmospheric pressure is sprayed into the exhaust gas has been newly developed and is in the stage of practical use.

  FIG. 8 shows a basic configuration of an exhaust gas temperature reduction system using hot water that has been developed and put into practical use by the applicant of the present application. In FIG. 8, 1 is an exhaust gas cooling tower, 1a Is an exhaust gas inlet, 1b is an exhaust gas outlet, 1c is an ash outlet, 1d is an airtight holding device, 2 is a hot water tank, 3 is a pressure pump, 4 is a hot water spray nozzle, 5 is a temperature control device, and 5a is an outlet side. An exhaust gas temperature detector, 5b is an exhaust gas temperature detector on the inlet side, 6 is a hot water amount control valve, Gh is a high temperature exhaust gas, GL is a low temperature exhaust gas, S is heated steam, Wt is hot water, and Ch is ash.

  When the temperature of the high-temperature exhaust gas Gh is reduced, the hot water Wt in the hot water tank 2 is sent to the hot water nozzle 4 by the internal pressure in the hot water tank 2 and / or the pressurized water supply force of the reduced temperature water pressurizing pump 3. Spraying from the spray nozzle 4 into the high temperature exhaust gas Gh. Since the hot water Wt sprayed from the hot water spray nozzle 4 is high-pressure water having a temperature substantially higher than the boiling point (100 ° C.) under atmospheric pressure, the hot water Wt is rapidly increased in the vicinity of the outlet of the hot water spray nozzle 4. The pressurized hot water boiled under reduced pressure and sprayed from the hot water spray nozzle 4 becomes fine particles having a particle size of about several tens of μm to several μm and instantly evaporates into water vapor, resulting in a high temperature in the exhaust gas cooling tower 1. This is cooled by heat exchange with the exhaust gas Gh. The low-temperature exhaust gas GL cooled to a predetermined temperature is attracted to the outside through the exhaust gas outlet 1b, and the ash (dust etc.) Ch in the separated exhaust gas is discharged to the outside from the ash outlet 1c.

  Since the exhaust gas temperature reduction system of FIG. 8 uses (a) pressurized hot water as the temperature reduction water, the sprayed hot water suddenly undergoes boiling under reduced pressure in the vicinity of the outlet of the hot water spray nozzle. In addition, it becomes a fine particle spray having a particle size of about several μm and instantly evaporates to become water vapor. As a result, damage to the gas cooling chamber wall caused by adhesion of water droplets and troubles due to dust accumulation are almost completely prevented, and (b) the sprayed hot water is instantly evaporated to cool the spray water. The performance is greatly improved, and the exhaust gas cooling tower can be greatly reduced in size. (C) When the hot water tank is sufficiently pressurized, the hot water pressurizing pump is not required and the equipment is installed. It can be configured very simply and the running cost can be greatly reduced. (D) When the deaerator is attached to the incinerator or boiler equipment, the hot water from the deaerator is used as it is. As the hot water equipment, only the hot water spray nozzle and the piping from the deaerator need be installed, and the exhaust gas temperature reducing equipment can be configured at a very low cost and has excellent effects. Have high practical utility That.

However, many problems to be solved still remain in the exhaust gas temperature reduction system, and the problems have been clarified along with the accumulation of practical tests.
The first problem relates to the hot water spray characteristics of hot water spray. Conventionally, in an exhaust gas temperature reducing device using hot water of this product, a single hole type nozzle and a hollow cone type nozzle (a swirl hole type nozzle) have been frequently used as boiling atomization nozzles.

  The former single-hole nozzle has a structure as shown in FIG. 9, and has a feature that the structure of the nozzle body 4a is simple and inexpensive, and that troubles are less likely to occur. However, when the nozzle diameter R increases, the sprayed water droplets discharged from the injection port 4a are likely to gather on the central axis φ side of the nozzle injection port 4b, and as a result, the exhaust gas of the hot water Wt in the exhaust gas cooling tower 1 The temperature reduction efficiency will decrease.

At the start of spraying of hot water Wt, the temperature of the hot water decreases due to cooling of the hot water Wt due to the heat capacity of the pipe itself or pressure reduction / vaporization in the pipe. Therefore, there is a problem that the hot water Wt is difficult to be sufficiently atomized.
The problem that the hot water Wt is difficult to be sufficiently atomized occurs similarly when the spraying is stopped. The relatively large particle size is caused by the remaining amount of hot water Wt remaining in the pipe when the spraying is stopped. There is a problem that water droplets are continuously ejected.

  On the other hand, in the latter so-called hollow cone type nozzle shown in FIG. 10, even if the swivel hole 4c of the swivel body 4d has a large diameter, the spray particles (spray water droplets) from the spray port 4b gather on the axis φ side. There is relatively little tendency. However, if the spray amount is adjusted by pressure control and enters the low spray pressure region, the spray state becomes extremely deteriorated and the so-called uniformly spread good spray state cannot be maintained, and as a result, the exhaust gas cooling efficiency is reduced. There are problems such as worsening.

JP 2000-274654 A JP 2001-314725 A JP 2002-113328 A JP 2003-254678 A

  The present invention has the problems as described above in the conventional exhaust gas temperature reduction system using hot water, that is, (a) in a single-hole hot water spray nozzle, the amount of hot water spray increases and the nozzle diameter R increases. Then, the spray water droplets concentrate near the nozzle axis φ, and the overall exhaust gas temperature reduction efficiency due to the hot water Wt decreases. (B) Hot water at the start of spraying of the hot water Wt or at the stop of spraying The spraying state is significantly worse than that during steady operation, and (c) in the case of a hollow cone type nozzle, when the flow rate of hot water is adjusted by pressure control, the spraying state is significantly worsened. In order to solve these problems, the problems such as (a), (b) and (c) are almost completely eliminated by improving the structure of the hollow cone type hot water spray nozzle. New hot water spray that can be prevented In addition to providing a boiling atomization nozzle for an exhaust gas temperature reducing device, a method for spraying pressurized hot water that enables efficient exhaust gas temperature reduction by simultaneously operating a plurality of boiling atomization nozzles is provided. This is the main purpose of the invention.

  The invention of claim 1 is a boiling atomization nozzle for an exhaust gas temperature reducing device for spraying pressurized hot water having a temperature higher than the boiling point of water under atmospheric pressure. A nozzle tip 11 having a hot water jet 12c communicating with the nozzle tip 11 is rotatably inserted into the rotor insertion portion 12a, and a straight single hole 15b is formed in the central portion and at the outer peripheral surface. A boiling atomization nozzle for an exhaust gas temperature reducing device for spraying pressurized hot water, characterized in that it comprises a rotor 15 having a spiral groove 15a formed therein.

  According to the second aspect of the present invention, the nozzle tip 11 is connected to the tip body 12 having the hot water outlet 12c, the hot water jet passage 12b and the rotor insertion portion 12a, and the rear side of the tip body 12 to which the rotor 15 is inserted. And a rotor support 13 fixed in an airtight manner with a sealing material 14 interposed therebetween.

  According to a third aspect of the invention, in the first aspect of the invention, the ratio L / D between the length L of the single hole 15b of the rotor 15 and the inner diameter D thereof is set to 7 or more.

According to a fourth aspect of the present invention, in the first aspect of the invention, the ratio S ₁ / S ₂ between the cross-sectional area S ₁ of the single hole 15b of the rotor 15 and the cross-sectional area S ₂ of the turning groove 15a is 0.2 or more. It is what I did.

  The invention of claim 5 is the invention of claim 1, wherein the front end surface 12e of the nozzle tip 11 is a flat surface.

  The invention according to claim 6 is an addition using a boiling atomization nozzle in which pressurized hot water having a temperature higher than the boiling point of water under atmospheric pressure is sprayed into the exhaust gas temperature reducing device to reduce the exhaust gas temperature. In the method of spraying pressurized hot water, a plurality of boiling atomizing nozzles 10 are arranged adjacent to each other in the center of the exhaust gas temperature reducing device 1, and an approximately equal amount of hot water Wt is supplied from each boiling atomizing nozzle 10. While spraying in the same direction as the exhaust gas flow, the basic configuration of the invention is that the interval Z between the hot water outlets 12c of the adjacent boiling atomization nozzles 10 is set to 300 mm or more.

  The invention of claim 7 is an addition using a boiling atomization nozzle in which pressurized hot water having a temperature higher than the boiling point of water at atmospheric pressure is sprayed into the exhaust gas temperature reducing device to reduce the exhaust gas temperature. In the method of spraying pressurized hot water, three boiling atomization nozzles 10 are arranged adjacent to each other in the center of the exhaust gas temperature reducing device 1, and an approximately equal amount of hot water Wt is supplied from each boiling atomization nozzle 10. While spraying in the same direction as the exhaust gas flow, the interval Z between the hot water outlets 12c of the adjacent boiling atomizing nozzles 10 is set to 100 to 300 mm, and the hot water outlet 12c of the boiling atomizing nozzle 10 located on both sides. The basic configuration of the present invention is that the axial direction of each is inclined 5 to 20 degrees opposite to the flow direction of the exhaust gas.

  In the boiling atomization nozzle according to the present invention, a swirling flow of pressurized hot water is formed inside the nozzle tip 11 by the high speed rotation of the rotor 15 having the swirling grooves 15a on the outer peripheral surface. Thereby, even if the diameter of the hot water jet (nozzle port) 12c is larger than that of the conventional single hole type nozzle, the water droplets of the sprayed hot water are evenly dispersed, and contact with the exhaust gas Gh. Increases efficiency. As a result, the evaporation time of the spray hot water is shortened, so that the exhaust gas temperature reducing device 1 can be greatly downsized.

Further, it is possible to prevent the deterioration of the spray state at the low spray pressure at the start and stop of spraying, and by flattening the tip portion of the nozzle tip 11, there is no entrainment of exhaust gas, causing a state of poor spraying. This prevents dust sticking and growth on the nozzle tip.
As described above, by using the boiling atomization nozzle of the present invention, it is possible to downsize the exhaust gas temperature reducing device and improve the temperature reduction efficiency.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a part of a boiling atomization nozzle for spraying hot water according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
The boiling atomization nozzle 10 is formed of a nozzle tip 11 and a rotor 15 rotatably inserted into the nozzle tip 11.

  The nozzle tip 11 includes a cylindrical rotor insertion portion 12a, a large-diameter ejection passage 12b, a small-diameter hot water ejection port 12c, a trumpet-shaped ejection port 12d, and a planar front end surface 12e. The chip body 12 and a rotor support body 13 having a flange 13a at the front end screwed to the rear of the chip body 12 are kept airtight between the chip body 12 and the rotor support body 13. A seal ring 14 is provided.

  The rotor 15 is a short columnar body having a spiral turning groove 15a having a U-shaped or semicircular cross-sectional shape on the outer peripheral surface and a single hole 15b having a circular cross-sectional shape in the center. A guide portion 15 c projects from the end surface into the rotary support 13.

Pressurized hot water Wt flowing into the chip body 12 from the upstream side of the rotor support 13 is formed between the single hole 15b, the inner peripheral surface of the rotor insertion portion 12a, and the outer peripheral surface of the rotor 15. The rotor 15 is rotated at a high speed by the turning force of the hot water Wt flowing through the swirl groove 15a.
As a result, the atomized water droplets from the single hole 15b are diffused by the swirling atomized water droplets from the swivel groove 15a, and the contact efficiency with the exhaust gas Gh is improved.

  FIG. 3 schematically shows a flow state of the hot water Wt in the boiling atomization nozzle 10, and the pressurized hot water Wt supplied into the nozzle tip is a small-diameter hot water spray port 12c. Through the bubble generation process accompanying the sudden pressure reduction in the inside, after spraying, the liquid breaks up instantly and atomizes. That is, a so-called spray state is obtained through a process of liquid phase flow, bubble flow, and liquid splitting.

The basic structure of the boiling atomization nozzle 10 is known, but the boiling atomization nozzle 10 according to the present invention uses hot water Wt and the inner diameter D of the single hole 15b and its length as will be described later. The ratio of the dimension L (L / D), the ratio of the effective sectional area S ₂ of the swivel groove 15a to the effective sectional area S ₁ of the _single hole 15b (S ₁ / S ₂ ), etc. are limited to values within a specific range. And so on.

  That is, in the hot water boiling atomization nozzle 10 of the present invention, the ratio L / D between the inner diameter D and the length dimension L of the single hole 15b of the rotor 15 is ideal as shown in K of FIG. In order to obtain a hot water spray state, the value is set to 7 or more, preferably 10 or more, and the ratio of the inner diameter D to the length L is set to L / D as described above, which is ideal. It has been confirmed by an actual operation test that can obtain a fine atomized state of hot water.

Similarly, the ratio S ₁ / S ₂ between the cross-sectional area S ₂ of the turning groove 15 a of the rotor 15 and the cross-sectional area S ₁ of the linear single hole 15 b needs to be set to a value of 0.2 or more. _{By making} the value of ₁ / S ₂ 0.2 or more, it has been confirmed by actual operation tests that hot water is finely divided uniformly over the entire range of the predetermined spray spread angle α.

  Furthermore, the front end surface 12e of the nozzle tip body 12 is preferably a flat surface. It has been confirmed by actual operation tests that the front end face 12e can be effectively prevented from adhering and growing dust on the tip of the nozzle 10 due to the inclusion of exhaust gas.

(Test Example 1)
FIG. 4 is an overall system diagram of a test apparatus used for obtaining basic data on a boiling atomization nozzle 10 for hot water spraying according to the present invention and a hot water spraying method using the same. In FIG. 4, 1 is an exhaust gas cooling tower, 2 is a hot water tank, 3 is a hot water pressurizing pump, 5 is an exhaust gas temperature control device after temperature reduction, 6 is a hot water control valve, 7 is a low-pressure steam reservoir, 8 is Steam heat exchanger, 9 is a condensate tank, 16 is a hot water temperature control device, 17 is a hot water circulation pressure control device, 18 is a water tank, 19 is a water supply pump, T is a temperature detector (or thermometer), P is a pressure detector (or pressure gauge), and F is a hot water flow meter.

A steam heat exchanger 8 is used as a heating source for the hot water Wt, and hot water (120 ° C. to 155 ° C., 1.1 MPa is supplied by supplying superheated steam S from the low pressure steam sump 7 to the heat exchanger 8. ~ 2.0 MPa) Wt is manufactured.
Further, the exhaust gas cooling tower 1 has an outer diameter of about 1500 mmφ and a height of about 8000 mm. In the exhaust gas cooling tower 1, the boiling atomization nozzle 10 is provided in a replaceable manner, and hot water Wt is sprayed at a spray temperature of 130 ° C. The spray was supplied under conditions of a spray pressure of 0.3 to 1.0 MPa and a spray amount of 100 to 250 kg / h, and the spray state was visually observed through the inspection window from the outside of the exhaust gas cooling tower 1. In Test Example 1, the supply of the high temperature exhaust gas Gh is stopped.

The observation of the hot water spray state is performed by measuring the L / D (L = length L of the single hole 15b, D = inner diameter of the single hole 15b) and the S ₁ / S ₂ (S ₁ = single) of the boiling atomization nozzle 10. Each of the seven different boiling atomizing nozzles 10 in which the cross-sectional area of the hole 15b, S ₂ = the cross-sectional area of the swirling groove 15a) was changed was performed.
Table 1 shows the results of Test Example 1 described above.

As is clear from the results of the spray test in which the L / D and S ₁ / S ₂ of the nozzle 10 are changed, uniform atomization is achieved when L / D> 7 and S ₁ / S ₂ > 0.2 or more. It has been found that a good spraying state can be obtained.

(Test Example 2)
Next, the temperature reduction test of the exhaust gas Gh was performed using the experimental apparatus of FIG. For the exhaust gas Gh, a municipal waste incineration facility pilot plant was actually operated, and the high-temperature combustion exhaust gas Gh was introduced into the exhaust gas cooling tower 1.
The test conditions are an exhaust gas flow rate of 1600 Nm ³ / H, an exhaust gas temperature of 420 ° C., a hot water spraying amount of 200 kg / H, an exhaust gas temperature of 180 ° C. at the exhaust gas outlet of the exhaust gas temperature reducing tower 1, and a hot water spray nozzle. Three types of nozzles were used, namely, the nozzle 10, a conventional single-hole spray nozzle, and a two-fluid spray nozzle (supplying compressed air slightly higher than the hot water pressure at a flow rate of about 1/3 of the hot water flow rate).

In the test, temperatures are measured at a number of locations inside the exhaust gas temperature reducing tower 1, and the time until the exhaust gas temperature at each point reaches a completely uniform temperature (that is, a constant temperature) (hereinafter referred to as evaporation time). Was performed by comparing.
Table 2 shows the results of Test Example 2.

As is apparent from the test results in Table 2, it was found that the boiling atomization nozzle 10 according to the present invention completed the evaporation of the spray particles most quickly, that is, the so-called hot water spray state was good. However, the dimensions of each main part of the nozzle 10 used in Test Example 2 were L = 1.2 mm, D = 10.0 mm, S ₁ = 1.1 mm ² , and S ₂ = 5.5 mm ² .

Further, in Test Example 2, the dust in the exhaust gas Gh adheres to both types of nozzles 10 in which the front end surface 12e of the chip body 12 of the boiling atomization nozzle 10 is a flat surface and those processed into an acute angle. The growth state was observed.
As a result, when the tip of the nozzle 10 was processed to an acute angle, it was confirmed that dust growth started from the vicinity of the injection port 12d, which deteriorated the spray state.

  Next, in order to obtain the optimum interval between the nozzle tips 11 when a plurality of boiling atomization nozzles 10 according to the present invention are used simultaneously, the exhaust gas temperature reducing tower 1 in FIG. 4 is changed to one in which the exhaust gas Gh is an upward flow. At the same time, the hot water Wt is changed to spray upward (that is, in the same direction as the flow of the exhaust gas Gh).

  FIG. 5 shows a case where the three boiling atomizing nozzles 10 are arranged in a line in a vertical posture and the interval Z can be adjusted, and FIG. 6 shows the inclination angle of the three nozzle tips 11. It shows a case where α is arranged in a row so as to be adjustable.

(Test Example 3)
First, as test conditions (test in a full continuous municipal waste incineration facility (55 ton / day)), an exhaust gas flow rate of 16000 Nm ³ / H, a high temperature exhaust gas Gh temperature of 280 ° C., a total hot water spray amount of 800 kg / h, an exhaust gas temperature reduction tower The exhaust gas temperature at the outlet GI is set to 180 ° C., and then the height position at which the exhaust gas temperature in the exhaust gas temperature reducing tower 1 becomes almost uniform is measured when the interval Z between the nozzle tips 11 is 200 mm, 300 mm, and 400 mm. did.
The temperature distribution in the temperature reducing tower 1 is detected by a plurality of temperature detectors arranged in the temperature reducing tower 1 as in the case of the evaporation time measurement in Test Example 2.

  FIG. 7 shows the test results. For example, when the distance Z between the three nozzle tips 11 is 300 mm, the exhaust gas temperature is about 150 ° C. at a height of about 5000 mm from the nozzle tips 11. Become a rank.

  On the other hand, when the distance Z between the nozzle tips 11 is 200 mm, the exhaust gas temperature at the height of about 5000 mm is about 130 ° C. at the center of the exhaust gas cooling tower 1 and 200 mm away from the center. It is about 110 ° C., and it can be seen that the temperature has not reached the same level.

  From the results of Test Example 3 shown in FIG. 7, when spraying hot water in parallel with the flow direction of the exhaust gas Gh using a plurality of nozzle tips 11, the distance between the nozzle tips 11 ( By setting the distance Z between the axes φ of the small-diameter hot water jets 12c to 300 mm or more, the exhaust gas temperature in the temperature reducing tower 1 is reduced in the radial direction at a position lower than the height direction of the temperature reducing tower 1. It was confirmed that it could be held uniformly throughout the entire area.

(Test Example 4)
In the test apparatus of FIG. 6, the three nozzle tips 11 are arranged in a horizontal row with an interval Z of 300 mm or less, and the inclination angle α of the nozzle tips 11 on both sides is adjustable, and the inclination angle α is The state of water droplets adhering to the inner wall surface of the exhaust gas temperature reducing tower 1 was observed by changing the temperature over 5 to 20 degrees.

The conditions such as the exhaust gas temperature GH supplied to the exhaust gas temperature reducing tower 1 are the same as in the test of FIG. 5, and the exhaust gas temperature reducing tower 1 has an inner diameter of 2400 mmφ and a height of about 10,000 mm. Furthermore, the structural conditions of the nozzle tip 11 used are as follows: the inner diameter R of the small-diameter hot water jet 12c is 1.6 mm, the inner diameter D of the single hole 15b is 1.2 m, the length L is 10.0 mm, and the cross-sectional area S _1. = 1.1 mm, cross-sectional area S ₂ of the turning groove 15 a = 5.5 mm ² , and the nozzle tips 11 are arranged with the mutual interval Z selected to be 300 mm or less.

From the results of Test Example 4, it was found that water droplets adhered to the inner wall surface of the exhaust gas cooling tower 1 when the inclination angle α of the nozzle tips 11 on both sides was set to 20 degrees or more.
Moreover, it was confirmed that the temperature reduction efficiency falls by interference of spray hot water as the inclination | tilt angle (alpha) is 5 degrees C or less.

  From the facts described above, it has been found that when a plurality of boiling atomization nozzles 10 are arranged in parallel and used simultaneously, the interval between them needs to be 300 mm or more. In addition, when a plurality (three) of the boiling atomization nozzles 10 are arranged in a horizontal row at the center of the temperature reducing tower 1 and the mounting angle α of the nozzles 10 located on both sides is changed, the inclination angle α is 5 to 5. It turns out that it needs to be between 20 degrees.

  In Test Example 3 and Test Example 4, the high temperature exhaust gas Gh is used as an upward flow, and hot water spraying is performed in the same direction as this, but the high temperature exhaust gas Gh is used as a downward flow and hot water spraying is performed. Of course, it may be carried out from the upper side to the lower side of the temperature reducing tower 1.

  Further, in Test Example 3 and Test Example 4, three hot water boiling atomization nozzles 10 are arranged in a horizontal row in the center of the exhaust gas temperature reducing tower 1, but the number of nozzles 10 and each nozzle 10 are set. Of course, as long as the interval Z between the nozzles 10 is 300 mm or more, the arrangement form can be arbitrarily selected.

  The present invention is mainly used for cooling combustion exhaust gas from various combustion apparatuses including municipal waste incinerators, ash melting furnaces, and boiler apparatuses.

It is the cross-sectional schematic diagram which longitudinally cut part of the boiling atomization nozzle for hot water spraying which concerns on embodiment of this invention. It is AA sectional view taken on the line of FIG. It is explanatory drawing which shows the flow state of the hot water Wt in the inside of the boiling atomization nozzle 10 of this invention. It is a whole system diagram of the test equipment used for each test of the hot-water spray characteristic of the boiling atomization nozzle concerning the present invention. It is a cross-sectional schematic diagram of the exhaust gas temperature-reduction tower used for the test of the hot-water spray characteristic in the case of using a plurality of boiling atomization nozzles. It is a cross-sectional schematic diagram of the exhaust gas temperature reduction tower used for the test of the hot-water spray characteristic at the time of using the boiling atomization nozzle provided with the some nozzle tip 11. FIG. It is a diagram which shows the test result in the hot-water spray characteristic test of FIG. It is a whole system diagram of an exhaust gas temperature-reduction tower using conventional hot water. It is a cross-sectional schematic diagram of a conventional single hole type hot water spray nozzle. It is a cross-sectional schematic diagram of a conventional hollow cone type hot water spray nozzle.

Explanation of symbols

Wt is hot water, S is heated steam, W is clean water, Gh is high-temperature exhaust gas, Gi is low-temperature exhaust gas, S ₁ is a cross-sectional area of a single hole, S ₂ is a cross-sectional area of a swirl hole, and D is an inner diameter of the single hole 15b. , L is single-hole 15b long in, D ₂ is the inside diameter of the pivot hole, R represents a nozzle diameter, phi is the axis of the nozzle injection port 4a, Ao bubbles, T is the temperature detector (or thermometer), P is the pressure Detector (or pressure gauge), F is a hot water flow meter, Z is an interval between nozzle tips, α is an inclination angle of the nozzle tips, K is a spray body of hot water, 1 is an exhaust gas cooling tower (exhaust gas cooling device), 1a Is an exhaust gas inlet, 1b is an exhaust gas outlet, 1c is an ash outlet, 1d is an airtight holding device, 2 is a hot water tank, 3 is a pressure pump, 4 is a hot water spray nozzle, 4a is a nozzle body, 4b is an injection port, 4c Is a revolving hole, 4d is a revolving body, 5 is a temperature control device, 5a is an exhaust gas temperature detector on the outlet side, and 5b is an exhaust gas temperature on the inlet side. Degree detector, 6 is a hot water control valve, 10 is a boiling atomization nozzle, 11 is a nozzle tip, 12 is a tip body, 12a is a rotor insertion part, 12b is a large-diameter ejection passage, and 12c is a small-diameter heat. Water ejection port, 12d is a trumpet-shaped ejection port, 12e is a flat front end surface, 13 is a rotor support, 13a is a flange, 14 is a sealing material, 15 is a rotor, 15a is a spiral swivel groove, 15b Is a single hole, 15c is a guide part, 16 is a hot water temperature control device, 17 is a hot water circulation pressure control device, 18 is a water tank, and 19 is a water supply pump.

Claims (7)

  In a boiling atomization nozzle for an exhaust gas temperature reducing device spraying pressurized hot water having a temperature higher than the boiling point of water under atmospheric pressure, a rotor insertion portion (12a) and heat communicating with the nozzle insertion portion A nozzle tip (11) provided with a water outlet (12c) and a rotor single hole (12b) are rotatably inserted into the rotor insertion part (12a), and a straight single hole (15b) is formed in the center. A boiling atomizing nozzle for an exhaust gas temperature reducing device for spraying pressurized hot water, characterized by comprising a rotor (15) having a spiral groove (15a) formed on its outer peripheral surface.   A nozzle body (12) having a nozzle tip (11), a hot water outlet (12c), a hot water jet passage (12b), and a rotor insertion portion (12a), and a rotor (15) were inserted. The pressurized hot water according to claim 1, wherein the pressure hot water is sprayed from a rotor support (13) fixed in an airtight manner with a sealing material (14) interposed behind the chip body (12). Boiling atomization nozzle for exhaust gas temperature reducer.   The exhaust gas temperature reducing device for spraying pressurized hot water according to claim 1, wherein the ratio L / D between the length L of the single hole (15b) of the rotor (15) and its inner diameter D is 7 or more. Boiling atomization nozzle for use. Cross-sectional area of the single-hole (15b) of the rotor (15) (S ₁₎ and turning groove (15a) cross sectional area (S ₂₎ and the ratio S ₁ / S ₂ a pressurized which is adapted to 0.2 or more Boiling atomization nozzle for exhaust gas temperature reducing device spraying pressurized hot water.   The boiling atomizing nozzle for an exhaust gas temperature reducing apparatus for spraying pressurized hot water according to claim 1, wherein the front end surface (12e) of the nozzle tip (11) is a flat surface.   A method of spraying pressurized hot water using a boiling atomization nozzle that sprays pressurized hot water at a temperature higher than the boiling point of water under atmospheric pressure into the exhaust gas temperature reducing device to reduce the temperature of the exhaust gas. In this case, a plurality of boiling atomization nozzles (10) are arranged adjacent to each other at the center of the exhaust gas temperature reducing device (1), and an approximately equal amount of hot water (Wt) is provided from each of the boiling atomization nozzles (10). Is used in the same direction as the exhaust gas flow, and the boiling atomization nozzle is characterized in that the interval (Z) between the hot water outlets (12c) of the adjacent boiling atomization nozzles (10) is 300 mm or more. The method of spraying pressurized hot water.   A method of spraying pressurized hot water using a boiling atomization nozzle that sprays pressurized hot water at a temperature higher than the boiling point of water under atmospheric pressure into the exhaust gas temperature reducing device to reduce the temperature of the exhaust gas. In this case, three boiling atomization nozzles (10) are arranged adjacent to the center of the exhaust gas temperature reducing device (1), and approximately equal amount of hot water (Wt) is provided from each of the boiling atomization nozzles (10). Is sprayed in the same direction as the exhaust gas flow, and the interval (Z) between the hot water outlets (12c) of the adjacent boiling atomization nozzles (10) is set to 100 to 300 mm, and the boiling atomization nozzles located on both sides A method for spraying pressurized hot water using a boiling atomization nozzle in which the axial direction of the hot water outlet (12c) of (10) is inclined by 5 to 20 degrees opposed to the direction of exhaust gas flow, respectively. .

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