JP3564626B2 - Blockage detection device for return nozzle for cooling liquid spray - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a blockage detection device for a liquid spray return nozzle used for cooling a high-temperature gas.
[0002]
[Prior art]
High-temperature gas generated in various manufacturing equipment and waste incineration facilities is generally released into the atmosphere from the chimney after removing various harmful components in the high-temperature gas by an exhaust gas treatment device. It is cooled to 200 ° C or lower for the purpose of protecting the constituent materials. In the cooling of this high-temperature gas, it is an important operation issue to perform stable and trouble-free operation for a long time.
[0003]
As this cooling means, a cooling liquid spraying type high temperature gas cooling device (hereinafter, abbreviated as “cooling device”) is mainly used. In particular, the performance of the cooling liquid spray nozzle determines the performance of the cooling device. It is no exaggeration to say that.
[0004]
It is possible to sufficiently cope with fluctuations in the temperature and volume of the high-temperature gas, and to provide a cooling nozzle in a high-temperature room such as an exhaust gas treatment device under conditions that require almost complete evaporation of the cooling liquid. The characteristics that should be
(1) The turndown is large.
(2) The spray particle size of the cooling liquid must be small. In particular, when the spray flow rate of the cooling liquid is small, the spray particle size does not increase.
{Circle around (3)} The spray flow rate per nozzle can be secured to some extent, and the desired cooling function can be satisfied with a small number of nozzles.
And so on. For this reason, it has the advantage of having a swirl type spray pattern capable of reducing the spray particle diameter and having good followability to fluctuations in load conditions such as temperature changes. A return nozzle employing a method of returning a surplus supply liquid is considered to be optimal.
[0005]
However, in the liquid passage in the return nozzle, there are three to four narrow distribution points, which may cause a blockage. Particularly, it is easy to block the narrowest chamber inlet, and it is difficult to detect the blockage. there were.
[0006]
In the cooling device in operation with the return nozzle set, the spray state of the return nozzle cannot usually be confirmed, so that the return nozzle is often blocked suddenly when unexpected.
When the return nozzle is closed, the following trouble occurs.
(1) The supply pressure and the return pressure are reversed, and the excess water from the other return nozzles flows back and spouts out into a rod-like form, causing a steam explosion that occurs when it separates from the high-temperature gas in the high-temperature chamber and falls on the deposited hot ash. There is a risk of occurring.
{Circle around (2)} In order to protect the inner wall of the high-temperature chamber from high temperatures, damage occurs such that the lining material attached to the surface of the high-temperature chamber is scraped off by the backflow of excess water from the return nozzle.
If such troubles are left unchecked, the operation will be stopped. Therefore, the return nozzles are regularly inspected as consumables and are replaced early.
[0007]
However, even when it is not time to replace the return nozzle, nozzle clogging may occur. In this case, it is inevitable that accurate temperature control cannot be performed due to incomplete evaporation of the cooling liquid.
As described above, the abnormality of the return nozzle is noticed by the abnormality of the temperature control of the high-temperature gas. In this case, the abnormal nozzle must be immediately removed from the cooling device and replaced. It takes time to find out which nozzle is abnormal, there is a delay that prompt correction of the operational abnormality is delayed, and damage to the nozzle and the lining material of the high temperature chamber cannot be avoided.
[0008]
[Problems to be solved by the invention]
In the present invention, when a return nozzle is blocked, the rod-shaped backflow of surplus water of the other return nozzle is immediately stopped, and the abnormal nozzle is accurately selected and replaced from the cooling device, so that abnormal operation, nozzle and high-temperature chamber It is an object of the present invention to provide a return nozzle blockage detecting device capable of minimizing damage to a lining material or the like.
[0009]
[Means for Solving the Problems]
The blockage detection device of the return nozzle for spraying cooling liquid of the present invention achieves the above-mentioned object, and is connected to a cooling liquid supply source by a supply pipe, and mounted and mounted on a high temperature chamber wall. The excess water return pipe from the plurality of cooling liquid spray return nozzles is provided with a check valve and its operation detector before the excess water from each nozzle merges , and the inside of the cooling liquid spray return nozzle is provided. If the check valve is closed, the check valve stops the return excess water from the other cooling liquid spray return nozzle, and the operation of the check valve from open to closed is detected by the operation detector It is characterized by doing so.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
[0011]
1 and 2 showing an embodiment of the present invention, reference numeral 1 denotes a high-temperature chamber such as an exhaust gas treatment device. On the side wall of the high-temperature chamber 1, return nozzles 2 for spraying cooling liquid are provided at a plurality of locations. It is set to penetrate. The cooling liquid spray return nozzles 2,... Are set so that the two nozzles 2, 2 face each other as shown in FIG. It can be granules. In FIG. 2, although simplified, a larger number of nozzles can be provided.
[0012]
The supply of water as the cooling liquid to the cooling liquid spray return nozzles 2 is sucked by the pump 4 from the water tank 3 and pressurized to 15 to 30 Kg / cm ² as shown in FIG. supply pipe 5 _1, the supply header 6, the nozzle 2 through the supply pipe 5 _2, is supplied to .... The total amount of supplied water is substantially constant, and is, for example, about 1.5 times the total amount of spray water (maximum spray water amount) of each nozzle 2,.
[0013]
Amount of water is sprayed into the hot chamber 1 is the difference in the supply amount and the refunded amount of water, the refunded amount is determined by the opening degree of the flow rate control valve 10 provided on the refunded side pipe 7 _2. Therefore, the amount of water sprayed into the high temperature chamber 1 increases by decreasing the opening of the flow control valve 10.
[0014]
The cooling liquid spray return nozzles 2, as shown in FIG. 3, mainly include an outer pipe 11, an inner pipe 12, and a nozzle portion 13, and supply water is supplied between the outer pipe 11 and the inner pipe 12. Then, while swirling through a small hole (nozzle chamber inflow port) 14 of the nozzle portion 13, it flows into the nozzle chamber 15 and is sprayed from the nozzle tip 16 into the high temperature chamber 1, while excess water is returned to the inner pipe 12 as return water. refunded side pipe ₇₁ through the _inner, refunded side header 8, refunded side pipe 7 _2, and be returned to the water tank 3.
[0015]
The minimum portion of the cross-sectional area of the fluid passages in the cooling liquid spray return nozzles 2 is a nozzle chamber inlet 14, and when foreign matter is clogged and blocked, water supplied from the pump 4 is supplied to the nozzle chamber 15. Does not reach or decreases, and excess return water from other nozzles flows back through the return header 8.
[0016]
The cooling liquid spray return nozzles 2,... Are not miniaturized by swirling and stirring the backflow water, so that the backflow water is ejected into the high temperature chamber 1 as a rod-shaped water flow. .
This phenomenon becomes more remarkable when the gas temperature in the high-temperature chamber 1 is lower than the set temperature and the signal for opening the flow control valve 10 is received, that is, when the spray flow rate is small and the return flow rate is large.
[0017]
The refunded side pipe _71, the cooling liquid atomizing return nozzle 2, but the check valve 9 shown in FIG. 4 is attached to each ..., refunded excess water is decreased when the foreign matter clogged closed Therefore, the shaft 17 of the check valve 9 is moved by the elastic force of the spring 18, and the O-ring 20 of the head 19 is tightly closed to the small-diameter portion 21, thereby closing the backflow water.
The check valve 9 is not limited to the illustrated one, and may be a sphere, shaft, or door that closes the through hole of the pedestal by gravity.
[0018]
The other end of the shaft 17 comes into contact with or comes close to a proximity switch (check valve operation detector) 22 mounted close to the check valve 9 due to the movement thereof, whereby a signal is transmitted, and That is, nozzle blockage can be detected. By displaying this signal on the display panel 23 or issuing an alarm in response to this signal, the operator can extract the abnormal nozzle, prevent thermal damage to the nozzle, and quickly replace the nozzle. In addition, it is also possible to automatically extract or replace the abnormal nozzle based on the detection signal of the abnormal nozzle with an automatic machine. At this time, in the case where extraction is first performed prior to replacement of the abnormal nozzle, it is desirable to extract a pair of opposed nozzles.
[0019]
【The invention's effect】
As is apparent from the above description, according to the present invention, the reverse flow of the return excess water from the other nozzle due to the clogging of the nozzle is immediately stopped by the check valve, and the trouble caused by the rod-shaped jet water generated thereby is reduced. In addition to detecting the operation of the check valve, the abnormal nozzle is accurately selected and replaced, thereby enabling the continuous and stable operation of the cooling device. can do.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of a blockage detecting device for a return nozzle for cooling liquid spray according to the present invention.
FIG. 2 is a schematic plan view showing an arrangement state of return nozzles and the like in FIG.
FIG. 3 is a schematic cross-sectional view of a cooling liquid spray return nozzle used in the present invention.
FIG. 4 is a schematic sectional view of a check valve used in the present invention.
[Explanation of symbols]
1 hot chamber 2 return nozzle 3 water tank 4 pump ₅ 1, _{5 2} supply pipe 6 supply side header _{71, 7 2} refunded pipe 8-return side header 9 check valve 10 flow regulating valve 22 proximity switch (check valve operation Detector)

Claims (1)

The excess water return pipes from the multiple cooling liquid spray return nozzles connected to the cooling liquid supply source via the supply-side piping and mounted and mounted on the high-temperature chamber wall join the excess water from each nozzle. Before performing the check valve and its operation detector, if the inside of the cooling liquid spray return nozzle is closed, the check valve is used to prevent the return excess water from returning from another cooling liquid spray return nozzle. A blockage detecting device for a return nozzle for cooling liquid spray , wherein the operation of the check valve is stopped and the check valve is operated from an open state to a closed state by an operation detector.

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