KR20050005140A - Scale Remover on Gas-Gas Heater Heating Element in Desulfurization System and Method Therefor - Google Patents

Abstract

PURPOSE: Provided is a cleaning agent for removing scales attached on the heat exchange device of a gas-gas heater used in a desulfurization apparatus, which removes the scales efficiently without any damages on the enamel coating of the heat exchange device. CONSTITUTION: The cleaning agent for removing scales from the heat exchange device of a gas-gas heater(GGH) used in a desulfurization apparatus comprises glycolic acid, citric acid and sulfamic acid as active ingredients. The cleaning agent optionally further comprises at least one selected from the group consisting of 5-sulfosalicylic acid, salicylic acid, ascorbic acid and tartaric acid. The cleaning agent is diluted with water at a ratio of between 1:5 and 1:15 and poured into a tank. The GGH heat exchange device is dipped into the tank to which air and steam are supplied, so that the scales are removed from the device.

Description

Scale Remover on Gas-Gas Heater Heating Element in Desulfurization System and Method Therefor}

The present invention relates to a cleaning agent and a cleaning method for cleaning a heat exchange element of a gas-gas reheater (GGH) used in a desulfurization facility. More specifically, the cleaning agent removes the scale attached to the heat exchange element of the gas-gas reheater based on glycolic acid, citric acid and sulfamic acid, and the heat exchange element of the gas-gas reheater is separated and deposited using the cleaning agent. And a method of cleaning by injecting a cleaning agent using a cleaning agent spraying device at the top of the gas-gas reheater.

Thermal exhaust gas (Flue Gas) generated by the boiler, such as power plants the sulfur oxides (SO _x) such as not only material (Ash) that results from the reaction of oxygen in the fuel and air sulfur dioxide (SO ₂₎ or sulfur trioxide (SO ₃₎ It will be included. Since the sulfur oxides cause not only air pollution but also acid rain, it is common to install and operate a flue gas desulfurization (FGD) to remove sulfur oxides contained in exhaust gas.

The exhaust gas treated in the desulfurization facility absorption tower is directly discharged through stacks, but a reheating method is used to increase the temperature of the exhaust gas discharged after the desulfurization treatment by using waste heat of the exhaust gas before the desulfurization treatment. This reheating method not only saves fuel, but also prevents corrosion of the gas ducts due to moisture contained in the exhaust gas passing through the absorption tower of the desulfurization facility, and facilitates the diffusion of white smoke gas. Reduce environmental pollution from the side.

1A is a schematic diagram showing the flow of exhaust gas generated in a boiler such as a thermal power plant.

The exhaust gas generated from the boiler 10 passes through an electrostatic precipitator (EP, 12) to remove dust and ash contained in the exhaust gas and to remove sulfur oxides contained therein through a desulfurization facility such as an absorption tower 16. It is discharged to the outside via the removed rear stack 18. In this process, the exhaust gas passes through a gas-gas reheater 14 (hereinafter referred to as 'GGH') in which heat exchange is performed between the exhaust gas before desulfurization and the exhaust gas after desulfurization.

Absorption tower 16 is a facility for removing sulfur oxides in the exhaust gas by reacting limestone (CaCO ₃ ) and sulfur oxides (SO _x ) to produce gypsum (CaSO ₄ ). The upper part of the absorption tower 16 is provided with a droplet eliminator (ME) for removing the gypsum slurry (Slurry) contained in the exhaust gas.

As described above, the desulfurization efficiency is improved by heating the low-temperature exhaust gas passing through the absorption tower 16 using the sensible heat of the high-temperature exhaust gas in the step before passing through the absorption tower 16 using the GGH 14.

Typical examples of the GGH 14 for reheating the exhaust gas include a Ljungstrom method in which a heat element rotates and a fixed compact method in which the heat exchange element does not rotate.

The Jungstrom method is a method in which the high temperature exhaust gas before the desulfurization treatment and the low temperature exhaust gas flowing out after the desulfurization treatment are heat-exchanged before or after the GGH 14 through different flow paths. Heat exchange takes place by means of the GGH heat exchange element. The Jungstrom method is excellent in the heat exchange effect, whereas the exhaust gas before and after the desulfurization treatment easily mixes as the heat exchange element rotates, so the probability of generating scale is great.

On the other hand, the compact method has the disadvantage that the heat exchange element is fixed, there is no problem of leakage of the exhaust gas and the generation of scale is smaller than that of the Jungstrom method, while the installation is difficult and the installation cost is high.

In general, the configuration of the Jungstrom-type GGH 14, in which scale formation is a major problem, is as follows.

FIG. 1B is a view showing a part of the heat exchange element of the Jungstrom type GGH.

The GGH 14 is formed by combining a plurality of GGH heat exchange elements 20. Each of the GGH heat exchange elements 20 may be separated and includes a plurality of heat transfer plates therein for efficiently performing heat transfer.

On the other hand, in the Jungstrom method, since each GGH heat exchange element 20 contacts the desulfurized exhaust gas and the exhaust gas before the desulfurization treatment, there is a high risk of corrosion. Therefore, the heat transfer plate in the GGH heat exchange element 20 is generally enamel coated.

However, in the heat transfer plate inside the GGH heat exchange element 20, the gypsum slurry, which was not removed in the course of passing through the droplet remover in the absorption tower 16, and the ash which was not removed in the electrostatic precipitator 12 are combined and adhered to each other so that the scale is firmly fixed. The problem of forming occurs. This scale causes plugging to cause not only the heat transfer efficiency of the GGH 14 but also the desulfurization performance. In particular, in the flue gas desulfurization facility, the GGH 14 is located in the middle of the flow of exhaust gas, and when the GGH 14 is clogged by the scale or there is a problem such as drift in the flow path, the entire power generation facility has to be stopped. The economic loss and the stability loss of plant operation are considerable.

Therefore, when the scale is accumulated in the GGH heat exchange element 20 and the differential pressure exceeds a predetermined value, the scale in the heat exchange element 20 must be removed by a physical or chemical method.

As a physical method for descaling the GGH heat exchange element 20, during operation of the GGH 14, a high pressure cleaning device, a steam blowing device, or the like attached to a facility may be used. During the stopping of the GGH 14, high pressure water or high pressure steam was injected onto the surface of the heat exchange element using a jet cleaning device or the like. However, such a high pressure washer has a problem of damaging the enamel coating of the GGH heat exchange element 20 due to the use of high pressure water or high pressure steam.

On the other hand, the scale attached to the GGH heat exchange element 20 is a gypsum, limestone, ash, etc., the main component is a compound such as silicon (Si), aluminum (Al), calcium (Ca) and sulfur (S). Iron (Fe), sodium (Na), magnesium (Mg) and the like are included.

Unlike inorganic scales, scales composed of these elements are chemically stable, poorly soluble scales, and thus, there is a problem in that cleaning power is weak when using conventional chemical cleaners and cleaning methods. In addition, since the entire surface of the heat exchange element is enameled to prevent corrosion due to combustion gases, a cleaner and a cleaning method are required in which the enamel coating is not damaged during chemical cleaning.

In order to solve the above problems, the present invention, in the cleaning agent for removing the scale attached to the heat exchange element of the GGH in the desulfurization plant, it is possible to effectively remove the scale attached to the heat exchange element without damaging the enamel coating of the heat exchange element. It is an object to provide a cleaning agent which can be used.

In addition, the present invention is a method for cleaning the heat exchange element by heating the cleaning agent dissolved in a predetermined concentration of the cleaning agent after depositing the heat exchange element and using the air blowing method (Air Blowing) and cleaning method for cleaning the heat exchange element by spraying the cleaning agent And another object of the present invention is to provide a cleaning device.

1A is a schematic diagram showing a flow of exhaust gas generated in a boiler such as a thermal power plant,

Figure 1b is a view showing a part of the heat exchange element of the Jungstrom type GGH,

Figure 2 is a magnification of 5000 times the damage of the enamel coating of the GGH heat exchange element after cleaning using the cleaning agent according to the present invention,

3 is a view showing the piping configuration of the deposition cleaning apparatus according to a preferred embodiment of the present invention,

Figure 4a is a plan view of the thermal element deposition cradle of the deposition cleaning apparatus according to a preferred embodiment of the present invention,

Figure 4b is a front view of the thermal element deposition cradle of the deposition cleaning apparatus according to a preferred embodiment of the present invention,

5 is a plan view for explaining a cleaning apparatus of a GGH heat exchange element according to another preferred embodiment of the present invention;

6 is a view showing an embodiment in which the injection nozzle is disposed when the size of the center angle of the detergent injection device is 60 degrees,

It is a figure which shows the piping state of the detergent spraying device.

<Description of Symbols for Main Parts of Drawings>

10 boiler 12 electric dust collector

14 gas-gas heater (GGH) 16: absorption tower

18: stack 20: GGH heat exchange element

30: water supply pipe 32: air supply pipe

34: steam supply pipe 38: air / steam supply pipe

40: holder 42: seating part

44: support portion 50: detergent injection device

60: spray nozzle 70: nozzle header

74: nozzle branch pipe 76: nozzle header support

78: injection device frame 80: cleaning agent supply portion

In order to achieve the above object, the present invention provides a cleaning agent for descaling a GGH heat exchanger element comprising glycolic acid, citric acid and sulfamic acid in the cleaning agent for descaling a GGH heat exchanger element used in a desulfurization facility.

The present invention also provides a descaling method of a GGH heat exchange element used in a desulfurization plant, wherein the descaling agent comprising glycolic acid, citric acid and sulfamic acid as an active ingredient is water and 1: 5 to 1:15, preferably Is diluted to 1:10 and filled in the tank, and after depositing the GGH heat exchanger element in the tank, supplying air and steam to remove the scale attached to the GGH heat exchanger element descaling Provide a method.

In addition, the present invention, in the descaling method of the GGH heat exchange element used in the desulfurization equipment, comprising a cleaner spray device 50 having a plurality of spray nozzles 60 on the upper GGH, the spray nozzle 60 The GGH heat exchange element by spraying the cleaning agent diluted 1: 1: 5 to 1: 15, preferably 1: 10 with water and a scale removal cleaner having an active ingredient glycolic acid, citric acid, sulfamic acid on top of the GGH through It provides a GGH heat exchange element descaling method, characterized in that to remove the scale.

In addition, the present invention, the cleaning agent spray device for descaling the GGH heat exchange element, the nozzle header 70 receives the cleaning agent from the cleaning agent supply unit 80; A nozzle branch pipe (74) connected to the connector (72) provided in the nozzle header (70) to receive the cleaning agent from the nozzle header (70); An injection nozzle (60) provided in the nozzle branch pipe (74) to receive and spray the cleaning agent; A nozzle header support (76) for fixing the nozzle header (70); And an injector frame 78 to which the nozzle header support 76 is fixed and to form a frame of the detergent injector.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The cleaning agent according to the present invention is characterized in that the composition contains glycolic acid (Glycolic Acid), citric acid (Citric Acid) and sulfamic acid (Sulfamic Acid) as an active ingredient and further contains 5-SulphosalicylicAcid (Benzonic Acid).

Glycolic acid is the first part of α-Hydroxy Carboxylic Acid and is soluble in water, ethanol, methanol, acetone, acetic acid and ethyl acetate. Glycolic acid is non-volatile and biodegradable, so it is not only environmentally stable but also dissolves in water and shows excellent cleaning power.

However, only glycolic acid alone is difficult to remove the scale effectively, and must be used in combination with other components. If strong acids are mixed, the scale made of organic salts can be effectively removed. However, in the case of the GGH heat exchange element 20, as described above, since the enamel coating is provided on the surface to prevent corrosion, effective scale removal must be performed without damaging the enamel coating. Therefore, a mixed use of strong acids is not preferable. .

Therefore, a descaling agent is prepared by using glycolic acid, citric acid, and sulfamic acid as main components, which are effective for removing scales without being strongly acidic.

On the other hand, it is also possible to add salicylic acid or tartaric acid belonging to the oxycarboxylic acid, such as glycolic acid, and to add benzoic acid (Benzonic Acid: 5-Sulfosalicylic Acid) which is a complex of sulfamic acid and salicylic acid. It is also possible.

In addition to the above-described chemical composition, it is also possible to add hydrochloric acid (HCl) in order to maximize the cleaning power.

This chemical composition will be described with reference to a preferred embodiment of the present invention.

Detergent composition of the present invention is as shown in Table 1 as 40.0% by weight glycolic acid, 16.7% by weight citric acid, 13.3% by weight sulfamic acid and the like.

Chemical cleaning with a cleaning agent must not only dissolve the scale attached to the inner surface of the thermal element, but also not corrode the enamel coated on the thermal element.

According to the present invention, a mixture of glycolic acid, citric acid and sulfamic acid was found to be the most suitable cleaning agent when tested using various chemicals in consideration of cleaning power and base material stability. This detergent is prepared as a 20% by weight solution, diluted to about 10 times during washing, and then used by heating to 60 to 70 ℃.

Example

The cleaning agent according to the present invention was prepared as shown in Table 1 below and used to descale the GGH heat exchanger.

Composition Composition ratio (% by weight) Salicylic Acid 98% 8.0 Tartaric Acid 99.8% 4.7 3-Amino-1,2,4-Triazole-5-Caboxylic Acid 98% 0.7 Sulfamic Acid 99.5% 13.3 Glycolic Acid 99% 40.0 Citric Acid 98% 16.7 5-Sulfosalicylic Acid (Benzonoc Acid) 95% 98% 8.3 Hydrochloric Acid (HCL) 1.7 Ascorbic Acid 6.6 system 100

For descaling test of the GGH heat exchanger element 20 using the cleaning agent prepared as shown in Table 1, the GGH heat exchanger element 20 of the desulfurization facility was removed and deposited for 30 hours in a washing apparatus installed in a collection tank of a desulfurization wastewater treatment plant. Washed.

At this time, the amount of detergent was injected 10 m 3 and diluted 10 times so that the total solution amount is 100 m 3. Moreover, the washing | cleaning temperature was 60-70 degreeC, and air and steam were blown in the washing | cleaning agent in order to improve the washing | cleaning effect. On the other hand, in order to test the cleaning power and the stability of the base material, a separate specimen with a scale was put and tested together with the GGH heat exchange element.

Detergency test results of the cleaning agent according to the present invention under the above test conditions are shown in Table 2.

division Specimen weight before washing (g) (a) Specimen weight after cleaning (g) (b) Base weight (g) (c) Detergency result (%) {(a-c)-(b-c)} / (a-c) × 100 Remarks Psalm 1 62.4520 54.9713 54.7481 97.10 Psalm 2 61.9856 54.0575 53.8123 96.99 Psalm 3 138.5497 105.4925 104.3280 96.59 Psalm 4 152.5827 123.1543 122.2764 97.10 Average - - - 96.94

As shown in Table 2, when the cleaning agent according to the present invention was used, the cleaning power was 96.94% on average, indicating that most of the scale was removed. On the other hand, when using the cleaning agent according to the present invention look at the degree of corrosion of the metal base material and the drop off of the enamel coating as follows.

The stability test results of the metal base material are shown in Table 3. Specimens tested for substrate stability testing were carbon alloy steel (A-588).

division Surface area (㎠) Weight before cleaning (g) Weight after cleaning (g) Specimen (Carbon Alloy Steel) 27.6133 19.8343 19.8145

When the results according to Table 3 were evaluated as corrosion loss, the corrosion loss was 0.0239 mg / cm 2 · hr, which showed a very good value.

In addition, the corrosion depth was 28.891 Mils / year, and a good result corresponding to the S grade was obtained based on ASTM standards. For reference, the grade of corrosion depth for carbon alloy steels (A-588), based on ASTM standards, is rated E below 2 Mils / year, grade G below 20 Mils / year, grade S 50 Mils / year. X grade is below 50 Mils / year.

2 is an enlarged photograph of 5000 times the damage degree of the enamel coating of the GGH heat exchange element 20 after cleaning using the cleaning agent according to the present invention.

The initial enamel coating thickness of the GGH heat exchanger is about 500 μm, and as shown in FIG. 2, when the cleaning operation is performed using the cleaning agent according to the present invention, a phenomenon such as pitting corrosion, which is a sign of damage of chemical cleaning, is observed. This was not found and very good results were obtained with a corrosion depth of 5 μm or less.

Next, a deposition cleaning apparatus and a cleaning method for cleaning the GGH heat exchange element 20 using the cleaning agent according to the present invention will be described.

Methods for cleaning the GGH heat exchange element 20 can be largely divided into two. One is the deposition cleaning method in which the GGH heat exchange element 20 is separated from the GGH 14 and is separately deposited and cleaned in the deposition cleaning device. The other is the GGH heat exchange element 20 without separating the GGH heat exchange element 20 from the GGH 14. This is a spray cleaning method in which a cleaning agent is sprayed onto the GGH 14 while the GGH 14 is rotated or the cleaning agent spraying device is rotated.

First, the deposition cleaning apparatus and method will be described.

3 is a view showing the piping configuration of the deposition cleaning apparatus according to a preferred embodiment of the present invention. In addition, Figure 4a is a plan view of the thermal element deposition cradle of the deposition cleaning apparatus according to a preferred embodiment of the present invention, Figure 4b is a front view of the thermal element deposition cradle of the deposition cleaning apparatus according to a preferred embodiment of the present invention.

As a method for cleaning the GGH heat exchanger element, the GGH heat exchanger element 20 is mounted on the cradle 40 for the thermal element deposition of a water tank (not shown) containing the detergent according to the present invention and deposited with the detergent of the present invention.

The detergent is diluted 1: 5 to 1:15, preferably 1:10 in water of about 60 to 70 ℃ as described above, in order to maximize the cleaning effect by steam and air together give. At this time, steam also serves to maintain the temperature of the diluted detergent at a constant temperature.

The piping configuration shown in FIG. 3 is for supplying water to the water tank and for supplying air and steam during the cleaning of the GGH heat exchange element 14.

Place the GGH heat exchange element 14 in the water tank and supplies water to the water tank through the water supply pipe (30). When the water fills the tank to a certain degree, the water supply valve 36 is closed to stop the water supply.

Air and steam are supplied to the air / steam supply pipe 38 through separate air supply pipes 32 and steam supply pipes 34, respectively, and are delivered to the air / steam supply pipes 38a, 38b, and 38c in the tank.

3, a total of three air / steam supply pipes 38a, 38b, and 38c in the tank are shown, but in the preferred embodiment of the present invention, the air / steam supply pipes 38a, 38b and 38c in the tank are shown in FIG. It is not limited to what is shown in the figure, and may be more or less.

4A and 4B show the holder for mounting the GGH heat exchanger for effective cleaning of the GGH heat exchanger.

Since the GGH heat exchange element 20 has a weight of about 300 to 700 kg, it can be difficult to directly settle in the water tank, and the scale is limited between thin heat exchange plates in the GGH heat exchange element 20. So it is to be mounted on the cradle 40 for effective cleaning.

The cradle 40 is composed of a seating portion 42 for mounting the GGH heat exchange element 20, a support portion 44 for supporting the lower portion of the cradle 40, the air / steam in the tank below the seating portion 42 Supply pipes 38a, 38b, 38c are attached. The air / steam supply pipes 38a, 38b, and 38c in the tank supply air and steam to the seating part 42 so that air and steam can be supplied to the GGH heat exchange element 20 mounted on the seating part 42. . At this time, in order to allow sufficient air and steam to be supplied into the GGH heat exchange element 20, the upper portion of the seating portion 42 includes a plurality of holes, and the air in the tank attached to the lower portion of the seating portion 42. It is preferable that the steam supply pipes 38a, 38b, and 38c also have a plurality of holes. That is, the air and steam supplied from the holes of the air / steam supply pipes 38a, 38b, and 38c in the tank are transferred to the GGH heat exchange element 20 through the seating portion 42.

Next, a spray cleaning method for cleaning the GGH heat exchange element 20 in a state in which the GGH heat exchange element 20 is coupled to the GGH 14 without separation from the GGH 14 and an apparatus therefor will be described.

5 is a plan view illustrating a cleaning apparatus of a GGH heat exchange element according to still another preferred embodiment of the present invention.

If the size of the detergent injector 50 is the same as the size of the GGH 14, the detergent injector 50 may be sprayed to all the GGH heat exchange elements 20 coupled to the GGH 14 at one time. The cleaning agent may be sprayed without the need to rotate the GGH 14.

However, making the size of the cleaning agent spray device 50 the same as the size of the GGH 14 causes problems in manufacturing, installation, etc. due to the increase in the size of the cleaning agent spray device 50, and the amount of the cleaning agent to be supplied increases. Therefore, the size of the detergent injection device 50 is similar to the diameter of the GGH diameter, but the size of the center angle is preferably between 45 degrees and 90 degrees.

The detergent spray device 50 is positioned on top of the GGH 14. It is also possible to spray the cleaner on top of the GGH 14 while fixing the cleaner spray device 50 and rotating the GGH 14, but spraying the cleaner on the top of the GGH 14 while rotating the cleaner spray device 50. You can also When rotating the detergent spraying device 50, the rotating shaft of the cleaning spray device 50 is configured to be concentric with the rotating shaft of the GGH 14.

FIG. 6 is a diagram illustrating an embodiment of disposing spray nozzles when the central angle of the detergent spray apparatus is 60 degrees. FIG.

As shown in FIG. 6, the spray nozzles 60 are arranged at regular intervals in the cleaner spray device 50 so that the cleaner is evenly sprayed on the GGH heat exchange elements constituting the GGH. However, in the practice of the present invention, the arrangement of the spray nozzle 60 is not limited to the arrangement shape shown in FIG. 6, and in some cases, close to the detergent supply unit 80 according to the difference in the pressure supplied with the cleaner. The silver injection nozzle 60 can be arrange | positioned a little wide, and the side which is far from the cleaning agent supply part 80 can arrange | position the injection nozzle 60 closely.

The piping for arranging the injection nozzles 60 is described as follows.

It is a figure which shows the piping state of the detergent spraying device.

The nozzle header 70 is provided with a connector 72 to which a nozzle branch pipe 74 to which an injection nozzle 60 is attached is connected. The nozzle header 70 is connected to the cleaner supply unit 80 to receive the cleaner from the cleaner supply unit 80 and to supply the cleaner to the nozzle branch pipe 74 connected to the connector 72. One surface of the nozzle branch pipe 74 is provided with a plurality of injection nozzles 60, the cleaning agent is injected through the injection nozzle 60 to the top of the GGH (14).

The nozzle header 72 is coupled with the nozzle header support 76, and the nozzle header support 76 is fixed to the injector frame 78 to support the nozzle header 72. On the other hand, in the part where the nozzle header support 76 and the injector frame 78 are fixed, it is preferable to fix with a material such as rubber in order to cushion the vibration generated when the cleaning agent is injected from the injector nozzle 60.

In the method of cleaning the GGH heat exchange element 20 using the cleaner injection device 50, the GGH heat exchange element 20 is cleaned without separating the GGH heat exchange element 20 as described above.

When the GGH 14 is fixed and cleaned, the cleaner spray device 50 is fixed for a predetermined time, usually about 4-6 hours, to inject the cleaner and then move to the next position to spray the cleaner. Alternatively, the cleaning agent spraying device 50 is fixed, and when a predetermined time elapses, the cleaning agent is sprayed by rotating the GGH at an angle and stopping again.

On the other hand, in addition to the method of cleaning the GGH heat exchange element 20 of the next position after completing the cleaning of some of the GGH heat exchange element 20 of the GGH, each GGH heat exchange element 20 may be continuously washed.

That is, the method of fixing the detergent spraying device 50 and spraying the detergent while rotating the GGH 14 at a constant speed may be used. The rotational speed of the GGH 14 is preferably about 1 to 3 rpm as in a normal heat exchange process, but is not limited thereto. Conversely, the GGH 14 may be fixed and the cleaner spray device 50 may be rotated. In this case, the cleaning operation may be completed by spraying the cleaning agent for about 20 to 30 hours.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, it is possible to effectively remove the scale attached to the GGH heat exchanger without damaging the enamel coating of the GGH heat exchanger as a chemical cleaning method instead of the physical method.

In addition, by removing the GGH heat exchanger element and the scale is removed by mounting the GGH heat exchanger element in the cradle provided in the tank using air and steam together with the cleaning agent according to the present invention, it is possible to reduce the cleaning time. .

In addition, by removing the GGH heat exchanger element from the GGH, and by performing a cleaning operation by installing a detergent injection device in the upper portion of the GGH, it is possible to save the working time due to the removal of the GGH heat exchanger element, easily and effectively attached to the GGH heat exchanger element The scale can be removed.

Claims (15)

In the cleaning agent for descaling a GGH heat exchange element used in desulfurization equipment, Detergent for descaling GGH heat exchanger elements comprising glycolic acid, citric acid and sulfamic acid as active ingredients. The method of claim 1, The cleaner, GGH heat exchange element descaling cleaner, characterized in that it further comprises at least one of 5-Sulfosalicylic Acid, salicylic acid, ascorbic acid, tartaric acid as an active ingredient. The method of claim 2, The cleaning agent for removing the scale GGH heat exchange element, characterized in that further comprises hydrochloric acid. The method of claim 2 or 3, The cleaning agent for removing the scale GGH heat exchange element characterized in that it further comprises a chelate. The method of claim 4, wherein The chelate is 3-Amino-1,2,4-Triazole-5-carboxylic acid cleaning agent for removing the scale GGH heat exchange element. In the descaling method of the GGH heat exchange element used in the desulfurization equipment, A descaling detergent containing glycolic acid, citric acid, and sulfamic acid as an active ingredient was diluted with water and 1: 5 to 1:15, preferably 1:10, and filled in a tank, and the GGH heat exchange element was deposited in the tank. After, supplying air and steam to remove the scale attached to the GGH heat exchange element. The method of claim 6, The GGH heat exchange element, A water tank for supplying the air and the steam to the water tank is provided under the seating portion 42 for mounting the GGH heat exchange element, the support portion 44 for supporting the seating portion 42 and the seating portion 42 A method for descaling a GGH heat exchange element, characterized in that mounted on a cradle (40) comprising an air / steam supply pipe (38a, 38b, 38c). The method according to claim 6 or 7, The temperature of the mixed solution of the detergent and the water in the water tank is 50 to 80 ℃, preferably 60 to 70 ℃ descaling method of the GGH heat exchange element. In the descaling method of the GGH heat exchange element used in the desulfurization equipment, Cleaner spraying device (50) having a plurality of spray nozzles (60) on the top of the GGH, and descaling the glycolic acid, citric acid, sulfamic acid as an active ingredient on the top of the GGH through the spray nozzles (60) A method of removing a scale of a GGH heat exchange element, wherein the scale of the GGH heat exchange element is removed by spraying a solvent with a solvent diluted with water of 1: 5 to 1: 15, preferably 1: 10. The method of claim 9, Method for removing the scale GGH heat exchange element, characterized in that the temperature of the diluent of the detergent and the water is 50 to 80 ℃, preferably 60 to 70 ℃. The method according to claim 8 or 9, In the state where the GGH and the detergent spraying device 50 are fixed, the detergent spraying device 50 sprays the diluent of the detergent and the water on the upper portion of the GGH for a predetermined time, and after the predetermined time has elapsed, the spraying position is changed. And changing and spraying the diluent of the cleaning agent and the water again on the upper part of the GGH for a predetermined time. The method according to claim 8 or 9, The cleaning agent spraying device (50) is fixed and the GGH heat removal element descaling method, characterized in that for spraying the diluent of the cleaning agent and the water on top of the GGH in a state of rotating at a constant rotational speed. The method according to claim 8 or 9, The GGH heat exchange element descaling method, characterized in that for spraying the diluent of the cleaning agent and the water on top of the GGH in a state where the GGH is fixed and the cleaner spray device (50) rotates at a constant rotational speed. In the cleaning agent spray device for descaling GGH heat exchange element, A nozzle header 70 which receives a cleaning agent from the cleaning agent supply unit 80; A nozzle branch pipe (74) connected to the connector (72) provided in the nozzle header (70) to receive the cleaning agent from the nozzle header (70); An injection nozzle (60) provided in the nozzle branch pipe (74) to receive and spray the cleaning agent; A nozzle header support (76) for fixing the nozzle header (70); And Injector frame 78 where the nozzle header support 76 is fixed and forms the frame of the detergent injector GGH heat exchange element descaling detergent injection device comprising a. The method of claim 14, The radius of the detergent spraying device is 80 to 120% of the GGH radius, the size of the center angle of the detergent spraying device is GGH heat exchange element cleaning control device, characterized in that the scale of 45 degrees to 90 degrees.