Vertical thermal deaerator

Abstract

The utility model relates to the technical field of deaerators, in particular to a vertical thermal deaerator which comprises a deaerating head, a water tank and a separating device used for reducing shaking of liquid in the water tank, the water tank is arranged below the deaerating head, the separating device is arranged in the water tank, and the end portion of the separating device is connected or connected with the inner wall of the water tank in an abutting mode. The utility model aims to overcome the defects in the prior art, and provides a vertical thermal deaerator, which can ensure that the vertical thermal deaerator does not occupy too much space on a ship with limited space, simultaneously achieves a good deaeration effect, and further has the advantages of simple structure and low cost. The separating device for separating liquid in the water tank is arranged for solving the problems that the inner wall of the water tank is damaged and the liquid level cannot be accurately detected due to liquid level surging in the water tank possibly caused in the ship running process.

Description

Technical Field

[0001] The utility model relates to the technical field of deaerators, and more specifically, to a vertical thermal deaerator. Background Art

[0002] Corrosion of the thermal equipment of ship boilers will cause tube burst and leakage accidents of the thermal equipment, and shorten the service life of the equipment. The main reason for the corrosion of boiler thermal equipment is that the water contains dissolved gases such as oxygen. Therefore, deaerating the feed water to prevent the corrosion of thermal equipment is an essential and important link to ensure the safe and economical navigation of ships. In order to prevent chemical corrosion in the boiler due to dissolved oxygen and other gases in the feed water, it is necessary to deaerate the feed water to remove most of the corrosive gases in the water. The main deaeration methods include thermal deaeration, chemical deaeration, membrane deaeration, electro-chemical deaeration, etc.

[0003] Thermal deaeration mainly uses the extraction steam of the steam turbine as the heating steam source, and directly transfers heat and mass between the steam and the condensate water. The boiler feed water is quickly heated to the saturation temperature under the working pressure. According to the theory of thermal deaeration, all the dissolved gases in the water are separated from the water at this time, and the separated gases are collected in the top exhaust pipe and discharged outside the deaerator, thus ensuring the quality of the feed water and preventing equipment corrosion. Moreover, whether it is the oxygen dissolved in the water or a small part of other corrosive gases, they can all be removed in thermal deaeration.

[0004] Conventional onshore external deaerators all adopt a horizontal structure layout, which is large in volume and usually requires a large horizontal space and sufficient installation space. Due to the limited installation height and space on ships, horizontal structure deaerators are not applicable. At the same time, since the water tank of conventional onshore external deaerators is installed on land and the land is stable, the probability of liquid level agitation in the water tank is small, and there is no need to set a liquid level anti-slosh partition device in the water tank. However, when a ship is sailing on the water surface, affected by wind waves and water waves, the liquid level in the water tank of the deaerator is prone to liquid level agitation, which interferes with the water level monitoring and is likely to cause irreversible damage to the inner wall of the water tank due to frequent liquid level agitation. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art that the horizontal structure deaerator occupies too large a volume and is not applicable to ships, and chemical deaeration will produce by-products, making it difficult to clean the water tank. The utility model provides a vertical thermal deaerator, which can ensure that it does not occupy too much limited space on the ship and can remove oxygen and other corrosive gases in the water at the same time. At the same time, aiming at the problem that the liquid level in the water tank of the deaerator is prone to liquid level agitation affected by wind waves and water waves during ship navigation, a partition device is set in the water tank to reduce liquid level agitation, ensure normal water level monitoring and prevent damage to the inner wall of the water tank.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] Provided is a vertical thermal deaerator, including a deaeration head, a water tank, and a partitioning device for reducing the liquid sloshing in the water tank. The water tank is installed below the deaeration head, and the partitioning device is installed in the water tank, with the ends of the partitioning device connected to or abutting against the inner wall of the water tank.

[0008] The partitioning device of the present utility model includes multiple partitioning plates, and the multiple partitioning plates are arranged in a crossed or parallel manner to divide the interior of the water tank into multiple independent regions; during the operation of the boiler thermal equipment on the ship, the deaeration head deaerates the incoming water. The water flows into the water tank after being deaerated by the deaeration head, and the partitioning device ensures that the water inside the water tank will not be disturbed by the liquid level agitation caused by the wind and waves during the ship's navigation on the water surface, and at the same time reduces the frequent liquid level agitation and prevents irreversible damage to the inner wall of the water tank.

[0009] Preferably, both ends of the partitioning plate are connected to the inner wall of the water tank, or one end of the partitioning plate is connected to or abuts against the inner wall of the water tank, and the other end is connected to an adjacent partitioning plate.

[0010] Preferably, the deaeration head includes a wall cylinder, a heat source, an exhaust device, a deaeration device, and a water inlet separation device. The heat source is installed inside or outside the wall cylinder and acts on the gas inside the wall cylinder. The deaeration device is installed inside the wall cylinder. There is a water inlet on the side wall of the wall cylinder and an exhaust port on the top. The water inlet is communicated with the water inlet separation device, and the exhaust port is communicated with the exhaust device.

[0011] Preferably, the heat source is a steam source. There are a first heating steam inlet and a second heating steam inlet on the wall cylinder. The first heating steam inlet and the second heating steam inlet are arranged in a circumferential direction misalignment and / or a height direction misalignment on the wall cylinder, and both the first heating steam inlet and the second heating steam inlet are communicated with the heat source.

[0012] Preferably, a baffle is further installed inside the wall cylinder. The baffle is located at the second heating steam inlet, and there is an air inlet channel left between the baffle and the second heating steam inlet.

[0013] Preferably, the water inlet separation device includes a main pipe and branch pipes for flow splitting. The end of the main pipe is communicated with the water inlet, and several branch pipes are all communicated with the main pipe. Multiple nozzles are respectively arranged at the bottoms of the main pipe and the branch pipes.

[0014] Preferably, the exhaust device includes an exhaust pipe and an exhaust separation device. The exhaust pipe is installed outside the wall cylinder and is communicated with the exhaust port. The exhaust separation device is installed inside the wall cylinder and is communicated with the exhaust port. The deaeration device includes several cooling layers arranged from top to bottom and packing laid on the cooling layers.

[0015] Preferably, a safety valve, a pressure gauge, and a maintenance hole are further installed on the wall cylinder of the deaerator head.

[0016] Preferably, a fixed support part is further installed outside the water tank. The fixed support part includes a fixing member and a supporting member. The fixing member is of an annular structure, surrounds the water tank for one week, and is connected to the supporting member at the lower end. The supporting member is connected to the ship surface.

[0017] Preferably, it further includes a liquid level height detection instrument installed outside the water tank and an electric steam trap connected to the water outlet at the bottom of the water tank.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] (1) The vertical thermal deaerator of the present utility model can not only remove oxygen and other gases in water, and the deaeration effect is stable and reliable, but also does not increase the salt content or other chemical substances in the water after deaeration.

[0020] (2) The vertical thermal deaerator of the present utility model is provided with a partition device for reducing the agitation of the liquid level in the water tank, avoiding the interference of the agitation of the liquid level in the water tank on the water level monitoring and the damage to the inner wall of the water tank caused by the influence of wind and waves during the ship's navigation.

[0021] (3) The vertical thermal deaerator of the present utility model occupies a relatively small volume and is suitable for ships with limited space. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a vertical thermal deaerator of the present utility model from a first perspective;

[0023] Figure 2 is a schematic structural diagram of a vertical thermal deaerator of the present utility model from a second perspective;

[0024] Figure 3 is Figure 2 the A-A sectional view of;

[0025] Figure 4 is a schematic structural diagram of components such as the water tank and the partition device of a vertical thermal deaerator of the present utility model;

[0026] Figure 5 is a schematic structural diagram of the partition device of a vertical thermal deaerator of the present utility model;

[0027] Figure 6 is a schematic structural diagram of the packing of a vertical thermal deaerator of the present utility model.

[0028] The illustration marks are explained as follows:

[0029] 1. Deaerator head; 11. Wall cylinder; 111. Water inlet; 112. Exhaust port; 113. Baffle; 12. Heat source; 121. First heating steam inlet; 122. Second heating steam inlet; 13. Exhaust device; 131. Exhaust pipe; 132. Exhaust separation device; 14. Deaeration device; 141. Cooling layer; 142. Packing; 15. Water inlet separation device; 151. Main pipe; 152. Branch pipe; 153. Nozzle; 2. Water tank; 3. Partition device; 31. Partition board; 4. Safety valve; 5. Pressure gauge; 6. Inspection hole; 7. Fixed support part; 71. Fixing part; 72. Support part; 8. Liquid level height detection instrument; 9. Electric steam trap. Detailed implementation mode

[0030] The present utility model will be further described below in conjunction with the detailed implementation mode. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0031] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Embodiment 1

[0033] As Figures 1 to 6 shown in the first embodiment of a vertical thermal deaerator of the present utility model, it includes a deaerator head 1, a water tank 2, and a partition device 3 for reducing the liquid sloshing in the water tank 2. The water tank 2 is installed below the deaerator head 1, the partition device 3 is installed in the water tank 2, and the end of the partition device 3 is connected or abutted against the inner wall of the water tank 2.

[0034] The deaerator head 1 of the present utility model deaerates the incoming water. The water tank 2 is installed below the deaerator head 1. The water is deaerated by the deaerator head 1 and flows into the water tank 2. The separation device 3 ensures that during the process of the ship traveling on the water surface, the liquid level inside the water tank 2 will not be agitated by the influence of wind waves and water waves, thus generating a false liquid level and interfering with the water level monitoring. At the same time, it reduces the frequent liquid level agitation and prevents irreversible damage to the inner wall of the water tank 2. The material of the water tank 2 of the present utility model is selected as Q245R steel plate, which has good corrosion resistance and processing performance. However, it does not mean that only Q245R steel plate can be selected. Various factors should also be considered, including pressure resistance, corrosion resistance, heat conduction performance, and cost, etc., to select a suitable material to meet the engineering requirements.

[0035] As an implementation manner of the present utility model, the separation device 3 includes multiple separation plates 31. Four separation plates 31 can be selected. The four separation plates 31 are arranged crosswise to divide the inside of the water tank 2 into five independent areas, which can reduce the free liquid surface area, equivalent to lowering the center of gravity of the ship, and enhancing the stability of the ship to a certain extent. The setting of the independent areas can also prevent large liquid level agitation when the ship tilts and sways during traveling. Selecting four separation plates 31 in this embodiment does not mean that only four can be selected. It should be determined according to the size of the water tank 2, budget, durability, and specific environment requirements, etc. One end of the separation plate 31 is connected or abutted to the inner wall of the water tank 2, and the other end is connected to another adjacent separation plate 31.

[0036] The deaerator head 1 of the present utility model includes a wall cylinder 11, a heat source 12, a deaeration device 14, an exhaust device 13, and a water inlet separation device 15. The heat source 12 is installed inside or outside the wall cylinder 11 and acts on the gas inside the wall cylinder 11. The deaeration device 14 is installed inside the wall cylinder 11. There is a water inlet 111 on the side wall of the wall cylinder 11 and an exhaust port 112 on the top. The water inlet 111 communicates with a connecting pipe outside the wall cylinder 11, and inside the wall cylinder 11, the water inlet 111 is connected to the water inlet separation device 15. The exhaust port 112 is connected to the exhaust device 13. The material of the wall cylinder 11 of the deaerator head 1 of the present utility model is selected as Q245R steel plate, which has good corrosion resistance and processing performance. However, it does not mean that only Q245R steel plate can be selected. Various factors should also be considered, including pressure resistance, corrosion resistance, heat conduction performance, and cost, etc., to select a suitable material to meet the engineering requirements. The heat source 12 is a steam source. There are a first heating steam inlet 121 and a second heating steam inlet 122 on the wall cylinder 11. The first heating steam inlet 121 and the second heating steam inlet 122 are arranged in a circumferential direction offset on the wall cylinder 11 and / or in a height direction offset on the wall cylinder 11. In this embodiment, the first heating steam inlet 121 and the second heating steam inlet 122 are arranged opposite to each other in the circumferential direction on the wall cylinder 11 and are offset in the height direction of the wall cylinder 11. Both the first heating steam inlet 121 and the second heating steam inlet 122 are connected to the heat source 12 through a connecting pipe. And a baffle 113 is also installed inside the wall cylinder 11. The baffle 113 is located at the second heating steam inlet 122. There is an air inlet channel left between the baffle 113 and the second heating steam inlet 122. The baffle 113 can change the flow direction of the secondary heating steam, making the steam enter the inside of the wall cylinder 11 more evenly to achieve a better mixing and temperature rising effect. The secondary heating steam inlet heats the atomized water to the boiling point temperature under the working pressure, discharging oxygen for preliminary deaeration. The first heating steam inlet 121 is arranged below the deaeration device 14. This setting method can achieve the effect of deep deaeration.

[0037] The deaeration device of the present utility model includes a plurality of cooling layers 141 arranged successively from top to bottom and a packing 142 laid on the cooling layer 141. The cooling layer 141 is arranged below the second heating steam inlet 122. The cooling layer 141 is a central disk, and a large number of through holes are drilled in the cooling layer 141. The edge of the cooling layer 141 is a very short cylindrical baffle, so that water forms a certain water level in the disk. Due to the action of gravity, the water forms a small cylindrical shape with the water level height as the head and flows downward from the through holes. The large number of through holes makes the water flow disperse into a large number of cylindrical thin streams to form a heat transfer area. At the same time, the number of through holes in the cooling layer 141 is determined by the rated output; a packing 142 is laid on each cooling layer 141. The packing 142 can increase the gas-liquid contact area to achieve a better deaeration effect. In this embodiment, the packing 142 is a metal Pall ring. The Pall ring belongs to a special Raschig ring. On the basis of the Raschig ring with a circular short section, wing surfaces are punched inward to increase the gas-liquid contact area. The materials of the Pall rings on the market are roughly divided into three types: ceramic, plastic, and metal. The metal Pall ring has the advantages of not being easily broken, having a moderate weight, and having moderate heat resistance and acid resistance. Therefore, the material of the Pall ring of the present utility model is selected as ferritic stainless steel, but it does not mean that the material of the Pall ring can only be ferritic stainless steel.

[0038] The exhaust device 13 of the present utility model includes an exhaust pipe 131 and an exhaust separation device 132. The exhaust port 112 is opened at the top of the wall cylinder 11. The exhaust pipe 131 is installed outside the wall cylinder 11 and is communicated with the exhaust port 112. The exhaust separation device 132 is installed inside the wall cylinder 11 and is communicated with the exhaust port 112. The exhaust separation device 132 can make the water vapor condense into small water droplets when it meets cold, separate the water vapor and waste gases such as oxygen, and prevent the water vapor from being discharged together with the waste gases. At the same time, the exhaust separation device 132 can also reduce the noise and air pollution caused by exhaust, and has an environmental protection effect. Further, the exhaust separation device 132 can be made of a metal material such as stainless steel with good corrosion resistance, high temperature resistance, and mechanical strength.

[0039] The water inlet separation device 15 of the present utility model includes a main pipe 151 for shunting and branch pipes 152. The end of the main pipe 151 is connected to the water inlet 111, and several branch pipes 152 are all connected to the main pipe 151. Multiple nozzles 153 are respectively provided at the bottoms of the main pipe 151 and the branch pipes 152. The water generally used on ships is desalted water. The desalted water flows from the water inlet 111 into the main pipe 151, then is shunted to several branch pipes 152, and then the desalted water is atomized and sprayed into the deaerator head 1 by the nozzles 153. The nozzles 153 of the present utility model are spring nozzles 153. The rated flow rate of a single nozzle 153 is 3 t / h, and the total number is 15. The parameters of the spring nozzles 153 are selected according to the maximum power required by the deaerator. The parameters of the nozzles 153: injection flow rate, injection angle, droplet distribution, injection force, droplet fineness, flow rate, pressure, injection angle, etc., are mainly selected according to the injection flow rate. The function of the spring nozzles 153 is to atomize the desalted water to form small droplets and increase the contact area between water and hot steam.

[0040] Embodiment 2

[0041] The following is the second embodiment of a vertical thermal deaerator of the present utility model. This embodiment is similar to Embodiment 1, but the difference is that the partition device 3 includes multiple partition plates 31. The multiple partition plates 31 are arranged longitudinally and parallelly to divide the inside of the water tank 2 into multiple independent areas. Both ends of the partition plates 31 are connected to the inner wall of the water tank 2 to reduce the width of the liquid level in each independent area inside the water tank 2. The influence of the scale of the free liquid surface in the transverse direction on stability is much greater than that in the longitudinal direction. Because when the ship rolls, the area moment of inertia of the free liquid surface is proportional to the cube of the width of the liquid tank. This embodiment sets a longitudinal isolation inside the water tank 2 to reduce the width of the liquid level in the independent area inside the water tank 2, or when the loading amount inside the water tank 2 exceeds 95% of the entire water tank 2 during the ship's voyage, the influence of the free liquid surface can be ignored.

[0042] Embodiment 3

[0043] By Figures 1 to 3The following shows the third embodiment of a vertical thermal deaerator of the present utility model. This embodiment is similar to Embodiment 1, but the difference is that a safety valve 4, a pressure gauge 5, and a maintenance hole 6 are further installed on the wall cylinder 11 of the deaerator head 1 of the present utility model. The pressure gauge 5 is used to observe the working pressure inside the deaerator head 1. The safety valve 4 is mainly used to control the pressure not to exceed the specified value. When the pressure exceeds the set value, the safety valve 4 will automatically open to release the pressure, preventing accidents caused by excessive pressure in the deaerator head 1. The discharge of the safety valve 4 can reduce equipment damage and potential safety risks caused by excessive pressure. The maintenance hole 6 is installed on the wall cylinder 11 between the water inlet shunt device and the deaeration device 14. The size of the maintenance hole 6 of the present utility model is selected as DN450. The diameter of the maintenance hole 6 is determined by factors such as the diameter of the container, the pressure grade, and the size of the removable parts inside the deaerator head 1. Its function is to facilitate the filling of the packing 142 inside the container in the early stage and the equipment maintenance inside the container in the later stage. The material of the pipe connection of the maintenance hole 6 and the cover of the maintenance hole 6 is selected as 20Ⅱ forgings, but it does not mean that only 20Ⅱ forgings can be selected. Various factors should also be considered to select a suitable material to meet the engineering requirements.

[0044] A fixed support part 7 is further installed outside the water tank 2 of the present utility model. The fixed support part 7 includes a fixing part 71 and a support part 72. The fixing part 71 is of an annular structure, surrounds the water tank 2 for one week and is connected to the support part 72 at the lower end. The support part 72 is connected to the ship deck and can be fixedly connected by steel beams and bolts to ensure that the water tank 2 will not shake, tilt or move during the ship's voyage, ensuring the stability of the system. At the same time, the support part 72 is made of I-beam, and the support part 72 separates the present utility model from the hull, reducing the contact between the present utility model and seawater and the wet ship deck, effectively improving the corrosion resistance of the present utility model and extending its service life.

[0045] The utility model further includes a liquid level height detection instrument 8 installed outside the water tank 2 and an electric steam trap 9 connected to the water outlet at the bottom of the water tank 2. If the liquid level height detection instrument 8 is not installed, it is difficult to observe the water level height in the water tank 2, and the water level monitoring cannot be carried out in a timely manner, and it cannot ensure that the water level in the water tank 2 is maintained within a predetermined operating range, thus affecting the normal operation of the vertical thermal deaerator. Moreover, both too high and too low water levels will have a negative impact on the performance of the vertical thermal deaerator. When the water level is too low, if the water source cannot be replenished in a timely manner, it will affect the safe operation of related equipment. When the water level is too high, it may lead to instability of the gas-liquid interface position. Secondly, the continuous change of the water level is difficult to monitor, which is not conducive to the operator to understand the working condition of the deaerator and is not conducive to optimizing the deaeration process, and it is difficult to guarantee the deaeration quality. The liquid level height detection instrument 8 and the electric steam trap 9 can jointly control the liquid level height in the water tank 2 and continuously monitor the water level in the water tank 2 to keep the liquid level height in the water tank 2 stable and ensure the continuity and efficiency of the gas separation process. In addition, the system of the electric steam trap 9 and the liquid level height detection instrument 8 equipped with the utility model can achieve automatic control and operate according to a preset water level range, which not only reduces the need for operator intervention, but also improves the convenience and consistency of operation and reduces the risk of operation errors.

[0046] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly explaining the present utility model and are not limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A vertical thermal deaerator, characterized in that, It includes a deaeration head (1), a water tank (2), and a partitioning device (3) for reducing the liquid sloshing in the water tank (2). The water tank (2) is installed below the deaeration head (1), and the partitioning device (3) is installed inside the water tank (2), with the ends of the partitioning device (3) connected to or abutted against the inner wall of the water tank (2).

2. The vertical thermal deaerator according to claim 1, characterized in that, The partitioning device (3) includes multiple partitioning plates (31), and the multiple partitioning plates (31) are arranged in a crossed or parallel manner to divide the inside of the water tank (2) into multiple independent areas.

3. The vertical thermal deaerator according to claim 2, characterized in that, Both ends of the partitioning plate (31) are connected to the inner wall of the water tank (2), or one end of the partitioning plate (31) is connected to or abutted against the inner wall of the water tank (2), and the other end is connected to an adjacent partitioning plate (31).

4. The vertical thermal deaerator according to claim 1, characterized in that, The deaeration head (1) includes a wall cylinder (11), a heat source (12), an exhaust device (13), a deaeration device (14), and a water inlet separation device (15). The heat source (12) is installed inside or outside the wall cylinder (11) and acts on the gas inside the wall cylinder (11). The deaeration device (14) is installed inside the wall cylinder (11). There is a water inlet (111) on the side wall of the wall cylinder (11) and an exhaust port (112) on the top. The water inlet (111) is communicated with the water inlet separation device (15), and the exhaust port (112) is communicated with the exhaust device (13).

5. The vertical thermal deaerator according to claim 4, characterized in that, The heat source (12) is a steam source. There are a first heating steam inlet (121) and a second heating steam inlet (122) on the wall cylinder (11). The first heating steam inlet (121) and the second heating steam inlet (122) are arranged in a circumferential direction offset on the wall cylinder (11) and / or in a height direction offset along the wall cylinder (11). Both the first heating steam inlet (121) and the second heating steam inlet (122) are communicated with the heat source (12).

6. The vertical thermal deaerator according to claim 5, characterized in that, A baffle (113) is also installed inside the wall cylinder (11). The baffle (113) is located at the second heating steam inlet (122), and there is an air inlet channel left between the baffle (113) and the second heating steam inlet (122).

7. The vertical thermal deaerator according to claim 4, characterized in that, The water inlet separation device (15) includes a main pipe (151) and branch pipes (152) for flow splitting. The end of the main pipe (151) is communicated with the water inlet (111). A number of the branch pipes (152) are all communicated with the main pipe (151). Multiple nozzles (153) are respectively arranged at the bottoms of the main pipe (151) and the branch pipes (152).

8. The vertical thermal deaerator according to claim 4, characterized in that, The exhaust device (13) includes an exhaust pipe (131) and an exhaust separation device (132). The exhaust pipe (131) is installed outside the wall cylinder (11) and is communicated with the exhaust port (112). The exhaust separation device (132) is installed inside the wall cylinder (11) and is communicated with the exhaust port (112). The deaeration device (14) includes a number of cooling layers (141) arranged in sequence from top to bottom and a filler (142) laid on the cooling layers (141).

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