JP5283327B2 - Cooler for denitration catalyst performance test equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooler for a performance tester of a nitrification catalyst which can easily remove acidic ammonium sulfate generated in the course of cooling treatment gas. <P>SOLUTION: The cooler for the tester of performance of the denitrification catalyst 100 installed for cooling the treatment gas on the discharging side of a performance tester of the denitrification catalyst which decomposes nitrogen oxides contained in an exhaust gas in contact with a mixture of the exhaust gas and a reduction gas under a heating condition is provided with a pipe 240 through which cooling water flows in an openable box body 110 and a treated gas flow passage 230 in which the treatment gas flow on the outside of the pipe. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

The present invention relates to a cooler for a denitration catalyst performance test apparatus provided on the discharge side of a denitration catalyst performance test apparatus for evaluating the performance of a catalyst used when denitrating nitrogen oxides in exhaust gas such as a boiler and an incinerator.

Conventionally, in order to denitrate nitrogen oxides (NO _x ) from exhaust gas from boilers, combustion furnaces, etc., ammonia gas is injected into the exhaust gas, the exhaust gas and ammonia gas are mixed, and the mixed gas is used as a denitration catalyst. A denitration apparatus that reduces the nitrogen gas and water vapor to contact with each other has been used (see Patent Document 1). And the development of the denitration catalyst used for this denitration apparatus is continued for the purpose of the further improvement of the denitration capability.

  In order to test the performance of this denitration catalyst, a denitration catalyst performance test apparatus is used. A denitration catalyst performance test device generates gas with the same components as exhaust gas from boilers, combustion furnaces, etc., raises the gas to almost the same temperature as exhaust gas from boilers, combustion furnaces, etc., and then mixes it with ammonia gas. In this device, the mixed gas is passed through a test denitration catalyst, the test is performed, and the performance of the denitration catalyst is grasped. In such a denitration catalyst performance test apparatus, the treated gas after the test is cooled to room temperature by a cooler for a denitration catalyst performance test apparatus (gas cooler for a denitration catalyst performance test apparatus) and then released to the atmosphere. It is like that.

  As such a denitration catalyst performance test device cooler, one having a structure as shown in FIGS. 6 to 8 is used. 6 is a schematic front view of a conventional denitration catalyst performance test apparatus cooler, FIG. 7 is a left side schematic side view of a conventional denitration catalyst performance test apparatus cooler, and FIG. 8 is a conventional denitration catalyst performance. It is a right schematic side view which shows the cooler for test devices.

  As shown in FIGS. 6 to 8, the conventional cooler 500 for a denitration catalyst performance test apparatus has a sealed box body 510, and a plurality of pipes 520 are provided on the inside upper side thereof. The outside of the pipe 520 is filled with cooling water, so that the processing gas flowing in the pipe 520 can be cooled. Further, a drain tank 530 for temporarily storing water generated by dew condensation when the processing gas is cooled is provided in the lower side of the cooler 500 for the denitration catalyst performance test apparatus. A water level meter 540 for visually confirming the water level of the drain tank 530 and a drain valve 550 for discharging the water stored in the drain tank 530 are attached to the side surface of the cooler 500 for the denitration catalyst performance test apparatus. ing.

However, when the processing gas flowing in the pipe 520 is cooled using the denitration catalyst performance test device cooler 500 as described above, ammonia contained in the processing gas reacts with sulfur oxide (such as SO ₃ ). Acidic ammonium sulfate (ammonium sulfide) is generated in the pipe 520. Then, the generated acidic ammonium sulfate adheres to the inner wall surface of the pipe 520 to form a scale, and the inner diameter of the pipe 520 is narrowed to hinder the flow of the processing gas flowing through the pipe 520, or the cooling efficiency of the processing gas is reduced. There was a problem that.

  Further, since the denitration catalyst performance test apparatus cooler 500 as described above has a sealed structure, the pipe 520 is taken out from the denitration catalyst performance test apparatus cooler 500, and the acidic ammonium sulfate adhering to the pipe 520 is removed. There was a problem that it could not be removed.

  Further, the water level meter 540 provided on the side surface of the denitration catalyst performance test device cooler 500 cannot accurately recognize the water level in the drain tank 530, or the side surface of the denitration catalyst performance test device cooler 500. There was a problem that the drainage of the drain tank 530 was poor because the diameter of the drain valve 550 attached to the lower part was small.

JP-A-5-163933

  In view of the circumstances described above, an object of the present invention is to provide a cooler for a denitration catalyst performance test apparatus that can easily remove acidic ammonium sulfate produced when a process gas is cooled.

According to a first aspect of the present invention for solving the above-mentioned problem, nitrogen gas contained in the exhaust gas is obtained by bringing a mixed gas obtained by mixing exhaust gas containing nitrogen oxides and a reducing gas composed of ammonia gas into contact with each other under heating conditions. A cooler for a denitration catalyst performance test apparatus that cools a processing gas and that is provided on the discharge side of a denitration catalyst performance test apparatus that tests the performance of a catalyst that decomposes oxides. Cooling in which a pipe that flows inside is disposed, a processing gas flow path for flowing the processing gas is provided outside the pipe, and the box is provided with a cooling water inlet for taking in cooling water at one end. A first cooling water storage tank having a water intake portion and a cooling water discharge portion provided with a cooling water discharge port for discharging the cooling water is provided, and the cooling water intake portion and the cooling water are provided at the other end. Each through the plurality of pipes to the discharge section A second cooling water storage tank that is continued is provided, and a processing gas intake port that takes the processing gas into an upper portion between the first cooling water storage tank and the second cooling water storage tank and the processing gas are provided. A processing gas discharge port is provided, and is disposed between the first cooling water storage tank and the second cooling water storage tank from an upper portion between the processing gas intake port and the processing gas discharge port. An upper box having the process gas flow path having a current plate extending in the vertical direction;
A lower box provided with a storage unit for storing water generated by condensation of the processing gas,
The flow path for flowing the processing gas outside the pipe of the upper box body is continuous through the space in the lower box body, and separates and combines the upper box body and the lower box body. Thus, the cooler for a denitration catalyst performance test apparatus is characterized in that the box is opened and closed .

In the first aspect, it is possible to easily remove acidic ammonium sulfate produced when the processing gas is cooled. Further, the box can be easily opened and closed, and water generated by the condensation of the processing gas can be easily stored.

In the second aspect of the present invention, a mixed gas obtained by mixing an exhaust gas containing nitrogen oxides and a reducing gas composed of ammonia gas is brought into contact under heating conditions to decompose nitrogen oxides contained in the exhaust gas. A denitration catalyst performance test device cooler that is provided on the discharge side of a denitration catalyst performance test device that tests the performance of the catalyst and cools the processing gas,
A pipe through which cooling water flows is arranged in an openable / closable box, and a processing gas flow path for flowing the processing gas is provided outside the pipe. The box has cooling water at one end. A cooling water intake portion provided with a cooling water intake port to be taken in and a cooling water discharge portion provided with a cooling water discharge port for discharging the cooling water are provided via the plurality of pipes formed in a U shape. Provided with a cooling water storage tank to which the cooling water intake section and the cooling discharge section are connected, and a processing gas inlet for receiving the processing gas at an upper portion between the cooling water storage tank and the other end. A processing gas discharge port for discharging the processing gas is provided, and between the cooling water storage tank and the other end portion, a lower vertical from an upper part between the processing gas intake port and the processing gas discharge port is provided. An upper box formed with the processing gas flow path having a current plate extending in the direction; And a lower box body reservoir is provided for storing water generated by condensation of the physical gas flow path flowing the process gas outside the pipes of the upper box body, said lower box body are continuous through the space, the denitration catalyst testing apparatus cooler you characterized by opening and closing the box body by separating and combining the upper box body and said lower box body is there.

In the second aspect, it is possible to easily remove acidic ammonium sulfate produced when the processing gas is cooled. Further, the box can be easily opened and closed, and water generated by the condensation of the processing gas can be easily stored.

A third aspect of the present invention is the cooler for a denitration catalyst performance test apparatus according to the first or second aspect, wherein a part of a side surface of the lower box is formed of a transparent member. It is in.

In the third aspect, the water level stored in the storage unit can be easily visually confirmed.

A fourth aspect of the present invention is a denitration catalyst performance test apparatus having the denitration catalyst performance test apparatus cooler described in any one of the first to third aspects.

In the fourth aspect, the denitration catalyst performance test apparatus can be used for a long time because it has a cooler for a denitration catalyst performance test apparatus that can easily remove acidic ammonium sulfate produced when the process gas is cooled. An apparatus can be provided.

  According to the cooler for a denitration catalyst performance test apparatus according to the present invention, it is possible to easily remove acidic ammonium sulfate produced when the process gas is cooled, and as a result, a denitration catalyst that can be used for a long period of time. A performance test apparatus can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

(Embodiment 1)
FIG. 1 is a schematic system diagram of a denitration catalyst performance test apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, a denitration catalyst performance test apparatus 1 according to this embodiment includes a gas production unit 10 that can produce a gas having the same component as the exhaust gas of a combustion apparatus such as a boiler. The gas production unit 10 is not particularly limited as long as it can produce a gas having the same component as the exhaust gas of a combustion apparatus such as a boiler. For example, NO _X , SO _X , CO, CO ₂ , O _2, etc. Examples of the apparatus include a tank that stores each component gas, extracts a predetermined amount of the component gas from the tank, and mixes and discharges the gas.

The gas production unit 10 is connected to the test unit 20, and the gas produced by the gas production unit 10 is sent to the test unit 20. Although not shown, the test unit 20 includes a heating device that heats a gas, an ammonia injection device, and a catalyst that tests denitration performance, and the gas sent from the gas production unit 10 is burned in a boiler or the like. After raising the temperature to almost the same temperature as the apparatus (about 360 ° C.), mixing with ammonia gas as a reducing gas, contacting the mixed gas with the catalyst, and denitrating NO _X in the mixed gas, The processing gas after the test can be discharged.

The test unit 20 is connected to the analysis unit 30 and can collect the processing gas in the test unit 20 and analyze the denitration performance. The analysis unit 30 is not particularly limited as long as it can collect the processing gas in the test unit 20 and analyze the denitration performance. For example, the amount of NO _{X in} the mixed gas before contacting with the catalyst And an apparatus for analyzing the NOx removal performance of the catalyst from the amount of NO _{x in} the processing gas after contacting the catalyst.

  Further, the test unit 20 is connected to the cooling unit 40. As will be described in detail later, the cooling unit 40 supplies a denitration catalyst performance test device cooler that cools the processing gas discharged from the test unit 20 and cooling water used for the denitration catalyst performance test device cooler. The processing gas discharged from the test unit 20 can be cooled and released to the atmosphere.

  By using such a denitration catalyst performance test apparatus 1, a gas having the same component as the exhaust gas of a combustion apparatus such as a boiler is produced, and the temperature of the gas is increased to substantially the same temperature (about 360 ° C.) as the combustion apparatus. , Mixed with ammonia gas, contact the mixed gas with the catalyst, test the denitration performance of the catalyst, analyze the results, and cool the process gas discharged after the test and release it to the atmosphere can do.

  Next, a cooler for a denitration catalyst performance test apparatus that constitutes the cooling unit 40 according to the present embodiment will be described in detail with reference to FIGS. FIG. 2 is a schematic cross-sectional view showing a denitration catalyst performance test device cooler according to the present embodiment, and FIG. 3 is a left side schematic side view showing the denitration catalyst performance test device cooler according to the present embodiment. 4 is a right side schematic side view showing a cooler for a denitration catalyst performance test apparatus according to the present embodiment.

  As shown in FIGS. 2 to 4, the cooler 100 for a denitration catalyst performance test apparatus according to the present embodiment includes a box body 110 including an upper box body 200 and a lower box body 300. The upper box body 200 and the lower box body 300 are fixed by a plurality of bolts 120, and the box body 110 can be opened by loosening the bolts 120 and separating them into the upper box body 200 and the lower box body 300. In addition, the box body 110 can be closed by fastening the bolts 120 and fixing the upper box body 200 and the lower box body 300 together. That is, the box body 110 can be opened and closed by separating and connecting the upper box body 200 and the lower box body 300.

  Here, the upper box 200 will be described first. At the upper part of the upper box body 200, a processing gas inlet 211 for taking in a processing gas sent from the test unit 20 (not shown) and a processing gas outlet 212 for discharging the cooled processing gas are provided. Further, the right side 201 of the upper box body 200 has a cooling water intake port 213 for taking in cooling water supplied from a cooling water supply device (not shown), and a cooling water discharge port 214 for discharging cooling water to the cooling water supply device. The cooling water can be circulated with the cooling water supply device. Here, the cooling water supply device is not particularly limited as long as it can supply cooling water, and may be a commercially available cooling water supply device.

  And the cooling water storage tanks 221 and 222 in which the cooling water is temporarily stored are provided at both end portions inside the upper box body 200, and the cooling water storage tank 221 and the cooling water storage tank 222 are provided. A processing gas flow path 230 through which the processing gas flows is provided therebetween.

  Between the cooling water storage tank 221 and the cooling water storage tank 222, a plurality of pipes 240 arranged in the horizontal direction so as to cross the inside of the processing gas flow path 230 are provided. The cooling water can be sent to the cooling water storage tank 222 or from the cooling water storage tank 222 to the cooling water storage tank 221. That is, the cooling water flows inside each pipe 240, so that the processing gas flowing outside each pipe 240 can be cooled. Here, the cross-sectional shape and the number of the pipes 240 are not particularly limited, and can be appropriately set according to the pressure loss and the cooling capacity in the processing gas channel 230.

  Further, the processing gas flow path 230 is provided with a rectifying plate 231 in the vertical direction so that the upper box 200 can be divided into two in the vertical direction and each pipe 240 can be supported. By providing the current plate 231, it is possible to prevent the piping 240 from being bent due to its own weight, and after the processing gas introduced from the processing gas intake port 211 flows downward, it passes over the current plate 231. The flow can be rectified so as to flow upward and to be discharged from the processing gas discharge port 212.

  Further, from the cooling water storage tank 221 to the cooling water storage tank 222, the processing gas flow path 230 is penetrated to bisect the cooling water storage tank 221 in the horizontal direction, and a part of the cooling water storage tank 222 protrudes inside. In addition, a partition plate 232 is provided in the horizontal direction. That is, the partition plate 232 bisects the cooling water storage tank 221 to form the cooling water intake part 221A and the cooling water discharge part 221B. By providing this partition plate 232, the cooling water taken in from the cooling water inlet 213 flows from the cooling water intake 221A of the cooling water storage tank 221 toward the cooling water storage tank 222, and then the cooling water storage tank The flow can be rectified so as to flow over the partition plate 232 projecting inside 222 toward the cooling water discharge portion 221 </ b> B of the cooling water storage tank 221 and to be discharged from the cooling water discharge port 214.

  By configuring the upper box 200 as described above, the acidic ammonium sulfate generated when the processing gas is cooled adheres to the outer wall of each pipe 240, and the acidic ammonium sulfate adheres to the inner wall of each pipe 240. Therefore, the inner diameter of the pipe 240 can be prevented from being narrowed by the scale formed on the inner wall surface of the pipe 240.

  Further, as described above, the box body 110 of the denitration catalyst performance test device cooler 100 according to the present embodiment can be separated into the upper box body 200 and the lower box body 300 by loosening the bolts 120. Therefore, the scale formed on the outer wall of each pipe 240 can be removed using normal cleaning means such as a brush.

  Further, since the cooling water flows inside the pipe 240 and the processing gas flows outside, the dew condensation of the processing gas occurs in the drain tank, which will be described later, without using a separation means that separates the water generated by the condensation of the processing gas from the processing gas. There is an effect that the water generated by can be collected.

  Next, the lower box 300 will be described. As shown in FIGS. 2 to 4, a drain tank 310 having an open top is formed in the lower box 300 so that water generated by condensation of the processing gas can be collected and stored. It has become.

  A part of the left side surface of the lower box 300 forming the drain tank 310 is formed of a transparent member, which acts as a liquid level gauge 340 as shown in FIG. 3 and is stored in the drain tank 310 from the outside. The height of the surface of the water that is being made can be visually confirmed.

  In addition, a drain valve 350 having a larger diameter than the conventional one is attached to the lower part of the left side surface of the lower box 300, and the drainage of the drain tank 310 can be improved compared to the conventional one. As a result, there is an effect that the maintenance work time of the denitration catalyst performance test device cooler 100 can be shortened. The drain valve 350 is not particularly limited, but a ball valve type is preferable.

  As described above, by providing the denitration catalyst performance test apparatus cooler 100, a denitration catalyst performance test apparatus cooler that can easily remove acidic ammonium sulfate produced when the process gas is cooled is provided. can do.

(Other embodiments)
In the first embodiment, as described above, the cooling water storage tanks 221 and 222 are provided on both end portions inside the upper box body 200, and between the cooling water storage tank 221 and the cooling water storage tank 222, Although a plurality of pipes 240 arranged in the horizontal direction so as to cross the processing gas flow path 230 are provided, the configuration of the cooler for a denitration catalyst performance test apparatus according to the present invention is not limited to this.

  For example, you may comprise the cooler for denitration catalyst performance test apparatuses as shown in FIG. Specifically, the denitration catalyst performance test device cooler 100A according to the present embodiment includes a pipe 240A formed in a U-shape in which only the cooling water storage tank 221 is provided at the right end of the upper box body 200. The cooling water intake unit 221A and the cooling water discharge unit 221B are connected to each other. That is, in the denitration catalyst performance test device cooler 100A according to the present embodiment, the cooling water sent from the cooling water intake unit 221A passes through the U-shaped pipe 240A disposed in the processing gas flow path 230A. It is comprised so that it may flow into the cooling water discharge part 221B. In addition, the same code | symbol is attached | subjected about the component similar to the cooler 100 for denitration catalyst performance test apparatuses which concerns on Embodiment 1, and description is abbreviate | omitted.

  Thus, even if the denitration catalyst performance test device cooler 100A according to the present embodiment is configured, the same effect as the denitration catalyst performance test device cooler 100 according to the first embodiment can be obtained.

1 is a schematic system diagram of a denitration catalyst performance test apparatus according to Embodiment 1. FIG. 1 is a schematic cross-sectional view of a cooler for a denitration catalyst performance test apparatus according to Embodiment 1. FIG. 1 is a schematic left side view of a cooler for a denitration catalyst performance test device according to Embodiment 1. FIG. 1 is a schematic right side view of a cooler for a denitration catalyst performance test apparatus according to Embodiment 1. FIG. It is a schematic sectional drawing of the cooler for denitration catalyst performance test apparatuses which concerns on other embodiment. It is a schematic sectional drawing of the cooler for the conventional denitration catalyst performance test apparatus. It is a left side schematic side view of the cooler for conventional denitration catalyst performance test equipment. It is a right side schematic side view of the conventional cooler for a denitration catalyst performance test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Denitration catalyst performance test apparatus 10 Gas production part 20 Test part 30 Analysis part 40 Cooling part 100,100A Cooler for denitration catalyst performance test apparatus 110 Box body 120 Volt 200 Upper box body 201 Right side part 211 Process gas inlet 212 Process gas Discharge port 213 Cooling water intake port 214 Cooling water discharge port 221, 222 Cooling water storage tank 221 A Cooling water intake unit 221 B Cooling water discharge unit 230, 230 A Processing gas flow path 231 Rectifier plate 232 Partition plate 240, 240 A Piping 300 Lower box Body 310 Drain tank 340 Level gauge 350 Drain valve

Claims (4)

Denitration catalyst performance for testing the performance of a catalyst that decomposes nitrogen oxides contained in exhaust gas by contacting a mixed gas, which is a mixture of exhaust gas containing nitrogen oxides and a reducing gas composed of ammonia gas, under heating conditions A cooler for a denitration catalyst performance test device that is provided on the discharge side of the test device and cools the processing gas,
In the openable and closable box, a pipe through which cooling water flows is arranged, and a processing gas flow path for flowing the processing gas is provided outside the pipe,
The box is
A first cooling water reservoir having a cooling water intake portion provided with a cooling water intake port for taking in cooling water and a cooling water discharge portion provided with a cooling water discharge port for discharging the cooling water at one end portion A tank is provided, and a second cooling water storage tank connected to the cooling water intake part and the cooling water discharge part via the plurality of pipes is provided at the other end, and the first cooling water storage is provided. A processing gas intake port for taking in the processing gas and a processing gas discharge port for discharging the processing gas are provided at an upper portion between the tank and the second cooling water storage tank, and the first cooling water storage tank and the The processing gas flow path having a rectifying plate extending in a lower vertical direction from an upper portion between the processing gas intake port and the processing gas discharge port is formed between the second cooling water storage tank. An upper box,
A lower box provided with a storage unit for storing water generated by condensation of the processing gas,
The flow path for flowing the processing gas outside the pipe of the upper box is continuous through the space in the lower box,
A cooler for a denitration catalyst performance test apparatus, which opens and closes the box by separating and connecting the upper box and the lower box . Denitration catalyst performance for testing the performance of a catalyst that decomposes nitrogen oxides contained in exhaust gas by contacting a mixed gas, which is a mixture of exhaust gas containing nitrogen oxides and a reducing gas composed of ammonia gas, under heating conditions A cooler for a denitration catalyst performance test device that is provided on the discharge side of the test device and cools the processing gas,
In the openable and closable box, a pipe through which cooling water flows is arranged, and a processing gas flow path for flowing the processing gas is provided outside the pipe,
The box is
One end has a cooling water intake portion provided with a cooling water intake port for taking in the cooling water and a cooling water discharge portion provided with a cooling water discharge port for discharging the cooling water, and is U-shaped. A cooling water storage tank in which the cooling water intake part and the cooling discharge part are connected via the plurality of formed pipes is provided, and the upper part between the cooling water storage tank and the other end is A process gas intake port for taking in the process gas and a process gas discharge port for discharging the process gas are provided, and the process gas intake port and the process gas discharge port are provided between the cooling water storage tank and the other end. An upper box body that forms the processing gas flow path having a rectifying plate extending in the lower vertical direction from the upper part between,
A lower box provided with a storage unit for storing water generated by condensation of the processing gas,
The flow path for flowing the processing gas outside the pipe of the upper box is continuous through the space in the lower box,
Denitration catalyst testing apparatus cooler characterized by opening and closing the box body by separating and coupling the lower box body and said upper box body. Denitration catalyst testing apparatus cooler according to claim 1 or 2, wherein a portion of the side surface of the lower box body is formed of a transparent member. A denitration catalyst performance test apparatus comprising the cooler for a denitration catalyst performance test apparatus according to any one of claims 1 to 3 .

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