Method and system for heating catalyst in different zones to prevent carbonate poisoning

Abstract

The present invention relates to the field of industrial catalyst application, namely, a method and system for heating catalysts in blocks to prevent carbonate poisoning. It is mainly used to prevent carbonate poisoning of catalysts. The steps are as follows: (1) The entire cross-section of the catalyst housing is divided into a plurality of blocks or dozens or hundreds of blocks. (2) A heating device is used to heat each block individually in a cycle. (3) The exhaust gas with the catalytic reaction is heated to a temperature suitable for instantaneous desorption of carbonates. The system is a heating device arranged on a horizontal track. The heating device includes a power cam driven by a motor and a frame, and the side of the power cam shaft is provided with a bow-shaped hanging arm, and the bow-shaped hanging arm connects the upper and lower ends of the unclosed heating barrel. The catalyst is heated in blocks and time periods, and only one or several heaters are used, which has low power consumption and is economical and reasonable.

Description

Technical Field

[0001] The present invention relates to the application field of industrial catalysts, namely, a method and system for heating catalysts in different blocks to prevent carbonate poisoning. In order to prevent carbonate poisoning of catalysts, a method and system for heating catalysts in different blocks and time periods are adopted. The method is not only applicable to garbage incineration boilers, biomass boilers, coal-fired boilers, catalyzing CO, CO2, and hydrocarbons to prevent carbonate poisoning of catalysts, but also applicable to chemical industry, fertilizer industry, and petroleum refining industry to remove carbonate poisoning of catalysts. Background Art

[0002] In the existing technology, since the second half of the 20th century, due to the rapid development of catalytic science and technology, various catalysts have been continuously infiltrated into many fields such as chemical industry, fertilizer industry, petroleum refining industry and environmental protection industry. Among them, when solid non-precious metal catalysts are used to catalyze reactions containing CO, CO2, one or more hydrocarbons and mixed gases of these gases, they will inevitably encounter carbonate poisoning problems when they are in low temperature reactions (below 350°C).

[0003] At present, the problem of carbonate poisoning of catalysts at home and abroad is solved from two aspects. One is to use precious metal catalysts. Because the desorption ability of precious metal catalysts for carbonates is much higher than that of non-precious metals. For example, Lu Junling of the University of Science and Technology of China led a scientific research team to successfully develop Fe(OH)3-Pt low-temperature catalysts in the world, solving the carbonate poisoning problem caused by low-temperature catalysis of CO in hydrogen fuel cell electrodes. The paper was published in the journal Nature on January 31, 2019. Pt metal elements cost several thousand yuan per gram. The cost is acceptable when used in hydrogen fuel cell electrodes, or in high-end automobile catalysts. However, most industrial catalysts are large-scale and the cost is unacceptable. The second is to increase the catalytic reaction temperature. For example, the temperature of a car engine is a little lower when it is just started, and it quickly reaches more than 700 or 800 degrees Celsius. Even if precious metal elements are not used, high temperature can easily desorb carbonates and will not cause carbonate poisoning. However, by increasing the reaction temperature, the electricity consumption is huge for catalyzing a large amount of gas, and the cost is unacceptable. The temperature of a 600-700 ton waste incineration boiler, biomass boiler or coal-fired boiler is above 300 degrees Celsius, or even 600-700 degrees Celsius. Such a temperature is completely enough to desorb carbonates. However, catalysis of carbon-containing exhaust gas from boilers that has not been desulfurized and dusted can easily lead to sulfur poisoning, arsenic poisoning and poisoning of many alkaline earth elements. If the exhaust gas is desulfurized and dusted first, the exhaust gas temperature will be reduced to 80-130°C. Reheating a huge amount of exhaust gas to about 350°C (usually the starting temperature for carbonate desorption) consumes a lot of electricity. Taking a 600-ton boiler as an example, the exhaust gas volume is nearly one million cubic meters per hour, and the electricity cost of heating from 120°C to 350°C is unacceptable. Numerous experts and scholars have published papers on the removal of toxic and harmful carbon-containing gases such as CO, dioxins, benzene, polycyclic aromatic hydrocarbons, and VOCs in boiler exhaust gas using catalysts in a short period of time. However, in the face of carbonate poisoning, the cost of using precious metal catalysts or increasing the reaction temperature is unacceptable. Although there are tens of thousands of papers, there is no real implementation in engineering. The fundamental problem is that no effective method has been found to prevent carbonate poisoning of catalysts. Summary of the invention

[0004] The object of the present invention is to provide a method and system for economically and effectively heating catalyst blocks to prevent carbonate poisoning in view of the above-mentioned shortcomings.

[0005] The technical solution of the present invention is: a method for heating the catalyst in blocks to prevent carbonate poisoning, characterized by the following steps:

[0006] (1) The entire cross-section of the catalyst housing is divided into multiple blocks or dozens or hundreds of blocks.

[0007] (2) A heating device is used to circulate heat each block individually (when the cross-sectional area of ​​the catalyst is particularly large, it can be divided into several large areas, each with a heating device to circulate heat the blocks in the respective area. The heating device carries a hydrogen tank and a steam tank, and sprays hydrogen and steam during heating to facilitate carbonate desorption).

[0008] (3) The exhaust gas that undergoes the catalytic reaction is heated to a temperature suitable for instantaneous desorption of carbonates.

[0009] In the above scheme,

[0010] In the case of no hydrogenation or steam addition, the heating temperature is about 350°C (300-350°C), and in the case of hydrogenation and steam addition in the system, the heating temperature is 200-300°C.

[0011] The heating device is an electric or electromagnetic heating device.

[0012] The heating barrel is divided into a plurality of blocks by metal plates which are surrounded in a grid shape vertically and horizontally.

[0013] The system of the method for heating catalyst blocks to prevent carbonate poisoning is characterized in that it includes at least one heating device that moves along the multiple blocks divided by the catalyst housing and heats each of them accordingly.

[0014] In the above system solution,

[0015] The heating device is arranged on a horizontal track and the heating device runs on the horizontal track (horizontal heating is not absolute, 0-44° and 134-180° should be regarded as horizontal heating. Movement within a certain slope is also within this range).

[0016] The heating device includes a power cam or gear and a frame driven by a motor, and a bow-shaped suspension arm is provided on the side of the power cam shaft, and the bow-shaped suspension arm connects the heating barrels which are not closed at the upper and lower ends (the unheated flue gas enters the upper barrel opening), and there is a heater in the barrel (the heated flue gas enters the heated barrel and the corresponding catalyst from the lower barrel opening. The embodiment of the present invention has only one heating system, but is not limited to this. In the face of a very large cross-sectional area of ​​the catalyst, it can be divided into several areas, and a separate running track, a separate heating device and system should be provided in a single area).

[0017] The power cam is an elliptical gear with horizontal teeth on the upper and lower parts.

[0018] The frame is provided with three air pipes connected to the hydrogen tank, steam tank or / and compressed air tank of the heating barrel. (Ensure that hydrogen, steam and compressed air can be sprayed. Hydrogenation and steaming of the catalyst are helpful for carbonate desorption, and compressed air is sprayed on the track to prevent particles from being compacted in the tooth groove of the toothed track by the power cam. For spraying hydrogen, steam and compressed air, there are not limited to three types, and they can be increased or reduced, but compressed air cannot be sprayed less, otherwise the horizontal toothed track will be filled with dust).

[0019] The track is a track rack (or toothed track). Two adjacent track racks are horizontally connected at 90 degrees through a flat steering gear. There are transfer teeth on the flat plane of the steering gear that are connected to the toothed track racks on both sides. The steering gear is meshed with a transmission rack that can push it to turn, thereby realizing left and right turns.

[0020] The steam tank is added with potassium nephrite, which not only has the function of removing carbonate, but also has the function of online repairing the catalyst with serious potassium loss, thereby extending the life of the original catalyst.

[0021] The poisoned catalyst is regenerated online by spraying a catalyst detoxifying solvent into the hydrogen tank.

[0022] The track is a toothed track, and there is a steering gear connected at the track bend. There are 32 teeth on the side of the steering gear, and 8 teeth (straight teeth) in the middle part of it. Because it is connected to the tracks on both sides, it can rotate, called the transfer gear. The cylinder drives the transmission rack, extends 8 teeth forward or retracts 8 teeth, and engages the side teeth of the steering gear to turn 90 degrees. It has two functions. One is to facilitate the transfer gear on the steering gear to connect with the toothed tracks in different directions, so that the power cam and the heating system can fall on the transfer gear. The second is that the steering gear can drive the power bald wheel and the heating system on the transfer gear to turn left or right.

[0023] There is a steering gear at the turning point of the toothed track; two toothed tracks at right angles are connected to the bearing sleeve, and the steering gear is placed flat in the bearing sleeve and can rotate. There are 8 teeth in the middle position on the steering gear, which are called transfer teeth 24. The side of the steering gear has 32 teeth around it, which are meshed with the transmission rack. The cylinder drives the transmission rack to extend or retract 8 teeth, and the steering gear and the transfer gear rotate 90°, so that the transfer gear can complete the docking with the toothed tracks in different directions. The power cam can run from the docked toothed track and drop the horizontal teeth on the transfer gear. The cylinder drives the transmission rack to rotate the steering gear 90°, and the power cam and the entire operating system it carries complete a 90° turn, ready to go to another toothed track. The transmission rack is not limited to extending and retracting 8 teeth, but can also be 16 teeth to realize the rotation of the steering gear, ushering in the power cam and heating system from one toothed track, and can also send the power cam and heating system to another toothed track to achieve a turn. This claim is the key technology for achieving turning of the horizontal heating system of the catalyst cross-section integral block.

[0024] To prevent catalyst carbonate poisoning, the catalyst block horizontal heating method and system is characterized by ensuring that the operating system runs smoothly when turning. The rotating bearing and guardrail can smoothly realize the hoisting heating barrel, which can also turn 90° without participating in the 90° rotation of the entire system.

[0025] The so-called block horizontal circulation heating system refers to the vertical layout of the catalyst box (see Figure 1 ), the boiler exhaust gas flows downward from the connecting flue at the top of the catalyst box and enters the catalyst box. The heated exhaust gas passes through the catalyst and is discharged from the connecting flue at the bottom of the catalyst box. The catalyst is arranged horizontally in its box, that is, the cross-sectional area of ​​the catalyst is upward. In order for the heating device to circulate and heat dozens or hundreds of blocks divided by the catalyst, it is necessary to set a horizontal circulation track above the horizontally arranged catalyst so that the heating device can heat the catalyst on the track, moving forward → heating → moving forward again → heating again, and repeating the cycle. The horizontal circulation heating system is not absolutely horizontal, and its angles cover 0°-45° and 135°-180°. A slight tilt should be regarded as horizontal circulation heating, while an angle of 45°-135° is regarded as a vertical circulation heating system, which falls within the scope of other patent applications.

[0026] The present application makes a breakthrough in the heating method, which can not only meet the temperature requirement of 200 to 350°C or above, but also reduce the cost to an acceptable level.

[0027] Catalyst carbonate poisoning is gradual or accumulates to a certain extent before it causes poisoning. Then there is no need to heat the entire cross-sectional area of ​​the catalyst box (the cross-sectional area of ​​the catalyst box of a large boiler is as high as one or two hundred square meters) uninterruptedly, and it can be heated in blocks and time periods. For example, a heater of 1000×1000mm, 500×500mm or 300×300mm (size can be designed at will) can be used to divide the cross-sectional area of ​​the catalyst box into dozens or hundreds of blocks with the same length and width as the heater, and circulate on the track according to a certain rule to heat each block one by one. From the starting point of operation, it takes 3-5 seconds to run to the first block, stop for 10-15 seconds to heat the exhaust gas participating in the catalytic reaction of the block to 350℃, and the carbonate is instantly desorbed, and then it takes 3-5 seconds to run to the next block for heating. Push on the track → stop heating → push again → stop heating again, and repeat the cycle over and over again. Heating is done in blocks and time periods, with only one or several heaters, and the electricity cost is almost one tenth or one hundredth of the traditional heating cost. One heater can heat more than 200 blocks in 60 minutes. The carbonate on the catalyst is removed before it accumulates to a certain extent, so it will not be poisoned. The heater can use electromagnetic heating, which has the advantages of faster heating speed and lower energy consumption, but it must use magnetic shielding technology or use magnetized catalysts. Cr20Ni80 resistance heaters can also be used, which are high temperature resistant and have a long service life.

[0028] The present invention can also use hydrogenation and steam desorption. Hydrogen and steam will turn carbonate into bicarbonate, which is easy to desorb. Under the conditions of hydrogenation and steaming, the temperature of carbonate desorption may drop even lower (above 200°C and below 300°C). If the catalyst is hydrogenated and steamed over the entire cross-sectional area for the entire period of time, the carbon material is distributed in a large amount of boiler exhaust gas. If less hydrogen is added, it is difficult to capture the carbon material, and if more hydrogen is added, the cost will be very high. On the heater that is cyclically operated in blocks and time periods, a polyfluoroethylene hose or a heat-resistant black rubber hose is carried to spray hydrogen and steam while heating the flue gas, and the cost of hydrogenation and steaming will be very low. Moreover, during the interval of cyclic heating, hydrogenation and steaming, the flue gas temperature is 80-120°C, and carbonate can only be adsorbed by the catalyst, and it is difficult to desorb. The catalyst becomes a trap for carbon material. When heating, hydrogenating and steaming, hydrogen will directly react with the carbonate on the catalyst, and there is no need to capture it in a large amount of flue gas.

[0029] A calculated amount of potassium pyroxene can also be added to the steam tank to slowly release low-concentration liquid potassium alkali under the action of steam, neutralize the acidity of carbonates, and accelerate their desorption. Adding potassium pyroxene can also replenish potassium for catalysts that have lost potassium seriously, and extend the life of the original catalyst.

[0030] In the face of arsenic poisoning of the catalyst, hydrogen carried by the heater is used. When heated by the heater, the arsenic will turn into trihydrogen arsenic and dissolve in water. It can be flushed away by spraying steam, thus achieving online regeneration of arsenic poisoning.

[0031] In the face of calcium and magnesium poisoning, the hydrogen tank is replaced with a hydroxyethylidene diphosphonic acid solution tank with a pH value of 2. The phosphonate ion has a chelating effect with calcium and magnesium. The injection of steam can flush and remove the chelate, thereby achieving online regeneration of calcium and magnesium poisoning.

[0032] In the face of potassium and sodium poisoning, the hydrogen tank is replaced with a 0.5 mol / L H2SO4 solution tank to neutralize the alkaline components and spray steam to flush and remove them, so as to achieve online regeneration of potassium and sodium poisoning. Advantages of online regeneration: 1. The boiler does not stop production and does not affect economic benefits. 2. Save a lot of manpower and material resources for disassembly and installation of catalysts. Catalyst poisoning, online regeneration is not limited to the above types.

[0033] The present invention can not only remove carbonate poisoning caused by the use of catalysts in garbage incineration boilers, biomass boilers, and coal-fired boilers, but also remove carbonate poisoning caused by catalyzing CO, CO2 or various hydrocarbons in the fields of chemical industry, fertilizer industry, petroleum refining industry, etc., and can also include potassium supplementation for potassium-deficient catalysts to extend the life of the catalyst.

[0034] Description: There are generally two layouts for catalyst reaction boxes of large boilers. One is that the flue gas is sent into the catalyst reaction box through a horizontal flue, and the catalyzed flue gas is discharged through the horizontal flue. The cross section of the catalyst is vertically arranged. If it is heated, a vertical heating system suitable for this layout is required. Catalyst cross sections of 45°-135° should be classified as vertical heating methods and systems. Another layout, in order to prevent smoke from being retained in the catalyst pores, uses flue gas to pass through a vertical flue, enter the catalyst box from the top, and the catalyzed flue gas is discharged from the bottom of the box. The cross section of the catalyst is horizontal, and a horizontal heating system suitable for this layout is required. Catalyst cross sections of 0°-44° and 134°-180° should be classified as horizontal heating methods and systems, which are exactly what this patent involves.

[0035] The advantages of the present invention are: 1. According to the traditional heating method, a huge amount of flue gas discharged from the boiler is heated, that is, a catalyst with a large or very large cross-sectional area is heated continuously for the whole time period, and the power consumption cost is unacceptable. The biggest advantage of this patent is that, in view of the characteristics that the carbonate poisoning of the catalyst is gradual and the carbonate will not be poisoned until it accumulates to a certain extent, the block-by-block horizontal heating is adopted, and one or several heaters are used, which has low power consumption and is economical and reasonable. Its cost is a few tenths or even a few hundredths of that of heating the entire cross-section of the catalyst. 2. According to the traditional method, the huge amount of exhaust gas discharged from the boiler and the whole cross-sectional area of ​​a large or very large catalyst are continuously hydrogenated and steamed, and the cost is unbearable. When hydrogenating and steaming are performed in blocks and time periods, carbonates can be desorbed as bicarbonates above 200°C, and during the time when no hydrogenation and steaming are performed, 80-120°C will not desorb carbonates, and the catalyst plays the role of a carbonate trap, and is removed together with heating, hydrogenation and steaming. 3. In particular, adding potassium pyroxene to the steam tank will not only remove carbonates more effectively, but also replenish potassium for potassium-deficient catalysts and extend the life of the original catalyst. 4. The catalyst is heated in blocks and time periods, and only one or several heaters are used, which has low power consumption and is economical and reasonable. 5. The cam structure or elliptical structure is adopted. When the power wheel stops running, the horizontal teeth on the cam fall on the toothed track. The radius of the horizontal teeth is smaller than the arc teeth and the center of the power cam. Therefore, the heating barrel sinks, and the gap with the heated barrel becomes smaller, which can reduce the overflow of the heated gas from the gap. Moreover, the hydrogen tank and steam tank on the heating barrel are sprayed with hydrogen and steam under high pressure, and the system has a slight shaking. The horizontal teeth have a large contact area, good stability, and reduce shaking. 6. A steering gear is designed during track operation. The side of the steering gear engages the transmission rack and turns 90 degrees, which is very accurate. 7. Replacing the gas or solution carried in the hydrogen tank can realize online regeneration of catalysts poisoned by arsenic, calcium and magnesium, potassium and sodium, etc. The online regeneration boiler does not stop production and does not affect economic benefits. It saves a lot of manpower and material resources for disassembling and installing catalysts. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a simplified structural diagram of the system heating device of the present invention.

[0037] Figure 2 It is a top view of the track arrangement structure of the system of the present invention.

[0038] Figure 3 It is a simplified diagram of the structure of the system of the present invention arranged in a catalyst reaction tower.

[0039] Figure 4 It is a simplified structural diagram of the power cam of the system of the present invention.

[0040] Figure 5 It is a top view of the steering gear and transfer gear of the system of the present invention.

[0041] Figure 6 It is a schematic diagram of the short track transmission rack and cylinder structure of the system of the present invention.

[0042] Figure 7 It is the side view of the middle track

[0043] Figure 8 It is a simplified structural diagram of the heating barrel of the system of the present invention.

[0044] Fig. 9 It is a schematic diagram of the plan layout structure of the heating barrel guardrail of the system of the present invention.

[0045] Fig.10 It is a side view of the steering gear and the transfer gear of the system of the present invention. DETAILED DESCRIPTION

[0046] See also Figure 1 -10, the names of the parts are as follows: motor 1, power cam 2, power cam shaft sleeve 3, frame 4, hydrogen stainless steel pipe 5, steam stainless steel pipe 6, bow-shaped suspension arm 7, rotating bearing 8, metal sling 9, heating barrel 10, hydrogen tank 13, compressed air tank 12, steam tank 11, support plate 14, steam hose 15, compressed air stainless steel nozzle 16, hydrogen hose 17, catalyst box 18, long track 19, short track with vacancy 20, middle track 21, short track without vacancy Track 22, steering gear 23, transfer gear 24, upper long transmission rack 25, lower long transmission rack 26, short track transmission rack 27, No. 1 cylinder 28, empty space 29, short track transmission rack roller 30, track support column 31, heating device return starting point channel 32, heating device starting point 33, heating barrel guardrail 34, catalyst 35, heating barrel 36, closing bevel 37, No. 2 cylinder 38, No. 3 cylinder 39, power cam horizontal gear 40, maintenance door 41.

[0047] See also Figure 1 -10, a method for heating the catalyst in blocks to prevent carbonate poisoning, the steps are as follows:

[0048] (1) The entire cross-section of the catalyst housing 18 is divided into a plurality of blocks ( Figure 2 , Figure 3 The catalyst 35 is divided into 16 blocks, but not limited thereto). The catalyst 35 is divided into 16 blocks by metal plates that surround the heating barrels 36 in a grid shape. The heating barrel 10 driven by the power cam 2 heats each heating barrel 36 and transmits the heat to the catalyst 35 corresponding to the block of the heating barrel 36, thereby achieving local heating of the catalyst 35.

[0049] (2) A heating device that moves along a track is used to heat each block individually. The heating device is an electric heating device or an electromagnetic heating device.

[0050] (3) The exhaust gas from the catalytic reaction is heated to a temperature suitable for instantaneous desorption of carbonates. The temperature is about 350°C without adding hydrogen or steam, and 200 to 300°C with hydrogen and steam, which is conducive to the desorption of carbonates.

[0051] See also Figure 1 -10. A system for heating catalyst blocks to prevent carbonate poisoning, comprising a heating device that moves sequentially along the sixteen blocks divided into the catalyst housing 18 and heats the corresponding catalyst. Figure 2 , Figure 3 The flue gas enters the catalyst box 18 from the top, enters the barrel from the upper opening of the heating barrel 10 suspended on the track, and the heated flue gas enters the heating barrel 36 from the lower barrel opening of the heating barrel 10, and then enters the catalyst 35, and is discharged from the flue from the bottom of the catalyst box 18. The flue gas runs from top to bottom. The catalyst 35 and the corresponding heating barrel 36 and the running track are all arranged horizontally, and the heating device circulates on the horizontal track, so it is called a horizontal heating method and system in blocks and time periods.

[0052] See also Figure 1 The heating device includes a power cam 2 driven by a motor 1 and a frame 4. The side of the power cam shaft sleeve 3 is provided with a bow-shaped suspension arm 7 (which is conducive to clearing the track). The lower end of the bow-shaped suspension arm 7 is connected to a heating barrel 10 with open ends. The unheated flue gas enters the upper barrel mouth, and the heated flue gas is sent to the heating barrel 36 at the lower barrel mouth, and then enters the catalyst 35. The frame 4 and the support plate 14 carry a hydrogen tank 13, a compressed air tank 12, and a steam tank 11 for allowing the air pipe to pass into the heating barrel 10. The hydrogen tank 13, the compressed air tank 12, and the steam tank 11 are controlled by electromagnetic valves. Hydrogen and steam are sprayed in while heating. The heating time for each heated barrel can be determined as needed. The compressed air is controlled by a solenoid valve and is used to blow off the dust on the toothed track. Although the exhaust gas is dust-removed in the catalyst housing, a small amount of residual particles will fall on the horizontally arranged toothed track. The power cam 2 runs on the track all year round, and the particles will be pressed into the track tooth grooves, which will easily fill up the tooth grooves over time. The compressed air stainless steel pipe 16 points to the toothed track. As long as the power cam 2 moves forward, the compressed air will be sprayed (designed for 5 seconds), and the power cam 2 stops (designed for 15 seconds), and the compressed air will be turned off. There is an electric or electromagnetic heating device in the heating barrel 3.

[0053] See also Figure 1 , 3When the potassium content of pyroxene in the steam tank 11 is insufficient, the steam tank 11 needs to be replaced with a new one. The power cam 2 drives the heating system to run to the heating device return starting point channel 32P just above the heating barrel 36. The maintenance personnel open the maintenance door 41 on the catalyst housing 18 from the outside, find the steam tank 11 on the support plate 14, open the quick card nearby to remove the old steam tank 11, connect the quick card to the new steam tank 11, and continue the cycle heating after online replacement.

[0054] See also Figure 2 , 6 9, the catalyst housing 18 is divided into sixteen blocks (not limited thereto). The track of the heating cycle is set on the sixteen blocks divided into the catalyst housing 18 (top view). The track is a toothed track, and the track includes a long track 19, a short track with vacancies 20, a middle track 21, and a short track without vacancies 22. Figure 2 There are three transmission racks, namely, the upper long transmission rack 25 (driven by the No. 1 cylinder 28), the lower long transmission rack 26 (driven by the No. 2 cylinder 38) and the short track transmission rack 27 (driven by the No. 3 cylinder 39, see Figure 6 ), No. 3 cylinder 39, arranged below the short track transmission rack 27 (see Figure 6 ). At the track bend (90 degrees), there are steering gears 23, a total of 8 (see Figure 2 ). The side of the steering gear 23 has 32 teeth around it, which mesh with the teeth of the transmission rack. The transmission rack extends or retracts 8 teeth, driving the steering gear 23 to rotate 90 degrees. The transport teeth 24 on the steering gear 23 can be connected with the track teeth in different directions, so that the power cam 2 can fall on the transport teeth 24. At the same time, the steering gear 23 can drive the power cam 2 on the transport teeth 24 to achieve a 90-degree left or right turn. When the power cam 2 turns, the empty space 29 is used to accommodate the bow-shaped boom 7. See Figure 5 , 10 , L1=80 mm, L2=25 mm, L3=30 mm, L4=25 mm, L5=40 mm.

[0055] See also Figure 3 , 7, flue gas passes from bottom to top. The catalyst is divided into multiple blocks by heated barrels 36 that are surrounded by metal plates in a grid shape. A heating barrel 10 driven by the power cam 2 performs cyclic heating on each heating barrel 36, and the heat is transferred to the heating barrel 36 corresponding to the catalyst 35 of the block, so as to achieve local heating of the catalyst 35. When the horizontal teeth 40 of the power cam 2 contact the toothed track, the heating barrel 10 drops 9.73mm and matches the heating barrel 36 (this is the advantage of the power cam 2 using elliptical gears, which reduces the gap, reduces air leakage, and increases stability.). There are sixteen heating barrels 36 in total, corresponding to the sixteen blocks divided by the cross section of the catalyst. The upper opening of the heating barrel 36 (length 300×width 300×height 150mm) has a closing bevel 37 with a width of 50mm, a slope of 20 degrees, and a high inside and a low outside (see Figure 8 ), the length and width of the closing part are 200mm respectively. During heating, the heating barrel 10 (length 200×width 200×height 350mm) matches with the heating barrel 36 (the inner convex bevel around the opening of the heating barrel 36 reduces the overflow of hot air). After heating, the heating device moves to the heating barrel 36 of the next block, heats again, and then moves forward, repeating the cycle.

[0056] See also Fig. 9 , is a top view. A heating barrel guardrail 34 is provided 10 cm above the heating barrel 36 ( Fig. 9 The heating barrel guardrail 34 is set along both sides of the running track of the heating barrel 10, so that the heating barrel 10 runs within the heating barrel guardrail 34 to prevent the heating barrel 10 from swinging. L6 = 220mm. L6 is the width of the guardrail. Figure 1 There is a rotating bearing 8 in it, and the heating operation system is on the steering gear 23. When it is necessary to turn left or right, the part above the rotating bearing 8 is on the steering gear 23 and rotates 90° on the spot to achieve a smooth turn. If the part below the rotating bearing 8, including the metal sling 9 and the heating barrel 10, also rotates 90°, not only a larger space is required, but the centrifugal force of rotation will inevitably cause the barrel body to shake. The function of the rotating bearing 8 is that the heating barrel does not need to be rotated 90°. When it is necessary to turn left, the barrel board originally belonging to the left side becomes the barrel board facing forward; when it is necessary to turn right, the barrel board originally belonging to the right side becomes the barrel board facing forward. With the cooperation of the guardrail 34, the rotating bearing 8 enables the heating barrel 10 to turn without rotating.

[0057] Catalyst horizontal heating system operating process parameters description:

[0058] See also Figure 2 , the heating device is placed on the steering gear 23 in the track, at this time, the horizontal tooth 40 of the power cam is meshed with the transport tooth 24 of the steering gear. Start the No. 1 cylinder 28 to drive the upper long transmission rack 25 to extend forward 8 teeth, and the two steering gears 23 meshed with the upper long transmission rack 25 rotate 90 degrees, ( Figure 2The middle steering gear transfer tooth 24 changes from horizontal to vertical), in preparation for the system operation. The sixteen heated barrels 36 waiting for heating under the track are numbered as follows: No. 1 heated barrel A, No. 2 heated barrel B, until No. 16 heated barrel P, see Figure 2 .

[0059] Heat the No. 1 heated barrel A. Start the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300 mm long, the power cam horizontal tooth 40 falls on the long track 19 above the No. 1 heated barrel A, stop, heat for 15 seconds, the solenoid valve controls the spraying of hydrogen and steam. Heat to 200 to 300 ° C, the carbonate on the catalyst 35 in this part is instantly desorbed, the same below.

[0060] Heat the No. 2 heated barrel B. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0061] Heat the No. 3 heating barrel C. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0062] While the No. 3 heating barrel C is being heated, the No. 2 cylinder 38 extends forward 8 teeth, and the four steering gears 23 meshing with the lower long transmission rack 26 rotate 90 degrees to prepare for the power cam 2 to fall (during the conversion process between the arc teeth and the straight teeth of the power cam 2, the heating barrel 10 falls down 9.73 mm).

[0063] Heat the No. 4 heated barrel D. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the power cam horizontal tooth 40 falls on the steering gear 23, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0064] While the No. 4 heated barrel D is being heated, the No. 2 cylinder 38 is retracted 8 teeth backwards, and the steering gear 23 is rotated 90 degrees to prepare for the system to turn left.

[0065] Heat the No. 5 heated barrel E. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the power cam horizontal tooth 40 falls on the next steering gear 23, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0066] While the No. 5 heated barrel E is being heated, the No. 2 cylinder 38 is further retracted by 8 teeth, and the steering gear 23 is rotated 90 degrees to prepare for the system to turn left.

[0067] Heat the No. 6 heated barrel F. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0068] Heat the No. 7 heating barrel G. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0069] While the No. 7 heat barrel G is being heated, the No. 3 cylinder 39 drives the short track transmission rack 27 to extend forward 8 teeth, and the two steering gears 23 there rotate 90 degrees to prepare for the power cam 2 to fall.

[0070] Heat the No. 8 heating barrel H. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the power cam horizontal tooth 40 falls on the steering gear 23, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0071] While the No. 8 heated barrel H is being heated, the No. 3 cylinder 39 drives the short track transmission rack 27 to retract 8 teeth backwards, and the steering gear 23 rotates 90 degrees to prepare for the system to turn right.

[0072] Heat the No. 9 heating barrel I. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the steering gear 23, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0073] While the No. 9 heated barrel 1 is heating, the No. 3 cylinder 39 drives the short track transmission rack 27 to retract 8 teeth, and the steering gear 23 rotates 90 degrees to prepare for the system to turn right.

[0074] Heat No. 10 heating barrel J. Turn on motor 1, power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, power cam horizontal tooth 40 falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0075] Heat the eleventh heating barrel K. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0076] While the No. 11 heat barrel K is being heated, the No. 2 cylinder 38 drives the lower long transmission rack 26 to extend forward 16 teeth, and the steering gear 23 rotates 180 degrees, preparing for the power cam horizontal tooth 40 to fall on the steering gear 23.

[0077] Heat the No. 12 heated barrel L. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the power cam horizontal tooth 40 falls on the steering gear 23, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0078] While the No. 12 heated barrel L is being heated, the No. 2 cylinder 38 drives the lower long transmission rack 26 to retract 8 teeth backwards, and the steering gear 23 rotates 90 degrees to prepare for the system to turn left.

[0079] Heat the No. 13 heated barrel M. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the power cam horizontal tooth 40 falls on the steering gear 23, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0080] While the 13th heated barrel M is being heated, the 2nd cylinder 38 drives the lower long transmission rack 26 to retract 8 teeth, and the steering gear 23 rotates 90 degrees, preparing for the system to turn left again.

[0081] Heat No. 14 heating barrel N. Turn on motor 1, power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, power cam horizontal tooth 40 falls on the track, stop, heat for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0082] Heat the No. 15 heated barrel O. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0083] Heat the No. 16 heating barrel P. Turn on the motor 1, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the track, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam.

[0084] While the No. 16 heat barrel P is being heated, the No. 1 cylinder 28 drives the upper long transmission rack 25 to contract 16 teeth, and the steering gear 23 rotates 90 degrees, preparing for the power cam horizontal tooth 40 to fall on the steering gear 23.

[0085] Turn on the power cam 2 and run for 5 seconds, run 30 teeth, 300mm, and the horizontal tooth 40 of the power cam falls on the steering gear 23.

[0086] The No. 1 cylinder 28 of the upper transmission rack 25 extends forward 8 teeth, runs for 15 seconds, 900mm, and the horizontal tooth 40 of the power cam falls on the steering gear 23 and rotates back to the starting point.

[0087] The No. 1 cylinder 28 of the upper transmission rack 25 extends forward 8 teeth, the motor 1 is turned on, the power cam 2 runs for 5 seconds, runs 30 teeth, 300mm, the horizontal tooth 40 of the power cam falls on the middle track 21 above the No. 1 heating barrel A, stops, heats for 15 seconds, and the solenoid valve controls the spraying of hydrogen and steam. At this point, a complete closed loop of cyclic heating is realized.

[0088] After the second cycle, the operation of the steering gear 23 and the transmission rack is different from the first cycle in two points; in the C heating barrel, the No. 2 transmission rack originally extended 8 teeth forward, and after the second cycle including countless cycles, it was changed to extend 16 teeth forward; in the G heating barrel, the No. 3 transmission rack originally extended 8 teeth forward, and was changed to extend 16 teeth forward, and the rest did not change.

[0089] The heating cycle continues in this way and the carbonate on the catalyst is desorbed.

[0090] The above description is only a specific implementation mode of the present invention, and various examples do not constitute a limitation on the essential content of the present invention.

Claims

1. A system for heating catalyst in different zones to prevent carbonate poisoning, characterized in that It comprises at least one heating device which moves along a plurality of blocks divided into a catalyst housing (18) and heats the blocks accordingly; The heating device is arranged on a horizontal track, and the heating device runs on the horizontal track; The heating device comprises a power cam (2) driven by a motor (1) and a frame (4); a side of the power cam sleeve (3) is provided with a bow-shaped suspension arm (7); the bow-shaped suspension arm (7) is connected to a heating barrel (10) which is not closed at the upper and lower ends; the power cam (2) is an elliptical gear having horizontal teeth at the upper and lower ends; The track is a toothed track. Two adjacent toothed tracks are horizontally connected at 90 degrees through a horizontally placed steering gear (23). The horizontally placed plane of the steering gear (23) is provided with a transfer tooth (24) connected with the racks of the toothed tracks on both sides. The steering gear (23) is meshedly connected with a transmission rack capable of driving the steering gear, and the transmission rack is connected to a cylinder.

2. A system for heating catalyst in different zones to prevent carbonate poisoning according to claim 1, characterized in that The frame (4) is provided with three gas pipes connected to the hydrogen tank (13), the steam tank (11) and / or the compressed air tank (12) of the heating barrel.

3. A system for heating catalyst in different zones to prevent carbonate poisoning according to claim 2, characterized in that The steam tank (11) is charged with potassium pyroxene.

4. A system for heating catalyst in different zones to prevent carbonate poisoning according to claim 2, characterized in that The catalyst detoxification solvent is sprayed into the hydrogen tank (13) to achieve online regeneration of the poisoned catalyst.

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