Coke oven riser normal-temperature membrane deoxidization waste heat recovery device

Abstract

The utility model discloses a coke oven riser normal temperature membrane deoxidization waste heat recovery device, which relates to the technical field of waste heat recovery and comprises a water deoxidization component and a waste heat recovery component. The water deoxidizing part comprises a normal-temperature membrane deaerator for deoxidizing at normal temperature, a steam pocket for collecting deoxidized water and a water feeding pump for conveying the deoxidized water into the steam pocket; the waste heat recovery component comprises an ascending pipe and a circulating pump which extracts deoxygenated water in the steam pocket and conveys the deoxygenated water into the ascending pipe, the deoxygenated water exchanges heat with a heat source in the ascending pipe and returns to the steam pocket again, and the steam pocket is further connected with a steam conveying pipe network used for conveying steam. According to the utility model, the existing system process can be optimized, the system heat exchange effect is improved, the system engineering cost is reduced, the field operation is simpler and more convenient, and the system operation power consumption and energy consumption are saved; a good deoxidizing effect can be achieved, the power consumption and the energy consumption of the system are reduced, and the operation safety of the system is enhanced; and emission and steam loss of the original system can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a coke oven riser normal temperature membrane deoxidation waste heat recovery device. Background Art

[0002] In the current riser waste heat recovery system, the deoxidation method usually adopts thermal deaerator, but the system using thermal deaerator is relatively complex, with many process equipment and high requirements for automatic control. In addition, it cannot achieve good deoxidation effect in some operations, which increases the danger of system operation.

[0003] The deaerator removes dissolved oxygen from the water. Its principle is to heat the feed water to the saturation temperature corresponding to the working pressure of the deaerator to remove the oxygen and other gases dissolved in the feed water. Although the deaerator heats the water and separates the oxygen, the specific gravity of oxygen is greater than that of the heating steam. Part of the oxygen is brought into the water tank by the downstream water, which will affect the deoxygenation effect. In addition, this method uses steam heating, which consumes a lot of energy.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The utility model aims to provide a coke oven riser normal temperature membrane deoxidation waste heat recovery device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides a coke oven riser normal temperature membrane deoxidation waste heat recovery device, comprising a water deoxidation component and a waste heat recovery component;

[0007] The water deoxygenation component includes a normal temperature membrane deaerator for normal temperature deoxygenation, a steam drum for collecting deoxygenated water, and a feed water pump for conveying the deoxygenated water to the steam drum;

[0008] The waste heat recovery component includes a riser and a circulating pump for extracting deoxygenated water from the steam drum and transporting it to the riser. The deoxygenated water exchanges heat with the heat source in the riser and returns to the steam drum. The steam drum is also connected to a steam transport network for transporting steam.

[0009] Furthermore, the normal temperature membrane deaerator includes a box with a rectangular structure, a membrane assembly is installed inside the box, an upper liquid inlet pipe is arranged on the left side wall of the box, a lower liquid discharge pipe is arranged on the right side wall of the box, and an exhaust pipe connected with its inner cavity is arranged on the top wall of the box.

[0010] Furthermore, the membrane assembly includes a hollow cylinder and a plurality of microporous polypropylene hollow fiber air pipes, the hollow cylinder is fixedly installed inside the box, and the plurality of microporous polypropylene hollow fiber air pipes are arranged in a surrounding manner inside the hollow cylinder to form a unit with water inlet and outlet and air inlet and outlet.

[0011] Furthermore, a vacuum and nitrogen purge pump is fixedly installed on the side wall of the box body, and an output end of the vacuum and nitrogen purge pump is fixedly connected to a connecting pipe, and the other end of the connecting pipe is connected to the membrane assembly.

[0012] Furthermore, the box body includes an upper box body and a lower box body, and the upper box body and the lower box body are fixed by multiple groups of bolts.

[0013] Furthermore, the liquid inlet pipe includes a tube body fixedly mounted on the upper part of the outer wall of the lower box body, a plurality of drainage holes are equidistantly opened on the outer wall of the tube body, a mounting seat is fixedly mounted on the outer wall of the tube body, a mounting shaft is fixedly mounted on the mounting seat, a spoiler blade is rotatably mounted on the outer wall of the mounting shaft, and the spoiler blade is arranged corresponding to the drainage hole.

[0014] Furthermore, the tube body is a hollow tube structure with one end open and the other end sealed, and the material of the tube body is stainless steel.

[0015] Furthermore, a filter filler is fixedly installed inside the upper box body, the filter filler is located above the membrane assembly, and the drain pipe is located below the filter filler.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model adopts a normal temperature membrane deaerator, simplifies the process flow of the waste heat recovery device, enhances the safety of the system operation, has a good deoxygenation effect, and can reach 1μg / L. When using normal temperature membrane deaerator, oxygen corrosion is prevented, the exhaust temperature of the system is reduced, the consumption of deoxygenation steam is saved, and the power consumption of the deoxygenation water pump is saved. Compared with thermal deaerator, it can save 20% of the operating cost to the greatest extent, reduce the power consumption and energy consumption of the system operation, and can achieve a good deoxygenation effect.

[0018] 2. The utility model transports desalted water from the outside to the interior of the normal temperature membrane deaerator through the liquid inlet pipe. The desalted water entering the liquid inlet pipe will flow out through the drainage hole. The inertial force of the water flowing into the water and falling on the spoiler blades will cause the spoiler blades to rotate automatically. The rotation of the spoiler blades can disturb the water, thereby improving the uniformity of the distribution of the desalted water inside the normal temperature membrane deaerator and improving the deoxygenation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the normal temperature membrane deaerator in the utility model;

[0021] Figure 3 It is a schematic cross-sectional structure diagram of the normal temperature membrane deaerator in the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the liquid inlet pipe in the normal temperature membrane deaerator.

[0023] In the figure:

[0024] 1. Normal temperature membrane deaerator; 11. Upper box; 12. Lower box; 13. Liquid inlet pipe; 131. Pipe body; 132. Drain hole; 133. Mounting seat; 134. Mounting shaft; 135. Turbine vane; 14. Drain pipe; 15. Vacuum nitrogen purge pump; 16. Connecting pipe; 17. Exhaust pipe; 18. Membrane assembly; 19. Filter packing; 2. Feed water pump; 3. Steam drum; 4. Circulation pump; 5. Riser; 6. Steam transport network. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] 1. The original system process is complicated

[0027] The original system uses a thermal deaerator, which requires the system to be equipped with a thermal deaerator, steam process pipeline, exhaust pipeline, deaerator feed water pump, liquid level control system, etc.

[0028] 2. Poor deoxygenation effect

[0029] Deoxygenation through the thermal deaerator mainly occurs at the deaerator head position. Usually, the deaerator head used in the system has poor performance and cannot achieve the ideal dissolved oxygen parameters. Once the dissolved oxygen parameter requirements cannot be met, it is easy to cause oxygen corrosion to the equipment during operation, posing a greater safety hazard to the thermal system.

[0030] 3. Emission of white gas and heat loss

[0031] After the thermal system deoxygenates, non-condensable gases such as oxygen must be discharged. Therefore, steam will inevitably be released in the process of discharging non-condensable gases. There will be white floating scenes in the process of steam release, which is particularly obvious during winter operation. Not only is there a waste, but it also affects the environment and aggravates the cause of haze.

[0032] The thermal deaeration system is an overall heating process, in which equipment, pipelines, etc. need to be insulated. The heat dissipation loss of the thermal system is inevitable, so additional steam consumption will be added to the thermal deaeration system.

[0033] See also Figure 1-4 The utility model provides a technical solution: it includes a water deoxygenation component and a waste heat recovery component; the water deoxygenation component includes a normal temperature membrane deaerator 1 for normal temperature deoxygenation, a steam drum 3 for collecting deoxygenated water, and a feed water pump 2 for conveying the deoxygenated water to the steam drum 3; the waste heat recovery component includes a riser 5 and a circulation pump 4 for extracting deoxygenated water from the steam drum 3 and conveying it to the riser 5, the deoxygenated water exchanges heat with the heat source in the riser 5 and returns to the steam drum 3, and the steam drum 3 is also connected to a steam conveying pipe network 6 for conveying steam.

[0034] See also Figure 2 and Figure 3 The normal temperature membrane deaerator 1 includes a box body with a rectangular structure, a membrane assembly 18 is installed inside the box body, an upper liquid inlet pipe 13 is arranged on the left side wall of the box body, a lower liquid discharge pipe 14 is arranged on the right side wall of the box body, and an exhaust pipe 17 connected with its inner cavity is arranged on the top wall of the box body. The membrane assembly 18 includes a hollow cylinder and a plurality of microporous polypropylene hollow fiber air pipes, the hollow cylinder is fixedly installed inside the box body, and the plurality of microporous polypropylene hollow fiber air pipes are arranged in a surrounding manner inside the hollow cylinder to form a unit with a water inlet and an outlet and an air inlet and an outlet. A vacuum and nitrogen purge pump 15 is fixedly installed on the side wall of the box body, and a connecting pipe 16 is fixedly connected to the output end of the vacuum and nitrogen purge pump 15, and the other end of the connecting pipe 16 is connected to the membrane assembly 18;

[0035] When the deionized water from outside the boundary area enters the membrane assembly 18 through the liquid inlet pipe 13, the membrane assembly 18 uses the hydrophobicity of the microporous polypropylene fiber and the structural characteristics of the fiber to make the aqueous solution flow in the microporous polypropylene fiber under the action of the water pressure difference and cannot overflow out of the fiber. At the same time, the water pressure inside the polypropylene microporous fiber and the gas partial pressure difference at the gas-liquid interface outside the polypropylene microporous fiber created by the vacuum nitrogen purge pump 15 make the dissolved oxygen in the water overflow the fiber. The transfer between liquid and gas is completely controlled by the gas partial pressure gradient inside and outside the fiber and the gas overflows. During the working process, there is no continuous liquid flow through the fiber micropores. The oxygen is discharged through the exhaust pipe 17, and the deoxygenated water falls and is then discharged through the discharge pipe 14.

[0036] See also Figure 4 The box body includes an upper box body 11 and a lower box body 12, and the upper box body 11 and the lower box body 12 are fixed by multiple groups of bolts.

[0037] See also Figure 3 and Figure 4The liquid inlet pipe 13 includes a tube body 131 fixedly mounted on the upper part of the outer wall of the lower box body 12, a plurality of drainage holes 132 are equidistantly opened on the outer wall of the tube body 131, a mounting seat 133 is fixedly mounted on the outer wall of the tube body 131, a mounting shaft 134 is fixedly mounted on the mounting seat 133, a spoiler blade 135 is rotatably mounted on the outer wall of the mounting shaft 134, and the spoiler blade 135 is arranged corresponding to the drainage hole 132;

[0038] During use, the desalted water from the outside is transported to the interior of the normal temperature membrane deaerator 1 through the liquid inlet pipe 13. The desalted water entering the liquid inlet pipe 13 will flow out through the drainage hole 132. The inertial force of the water flowing into the water and falling on the spoiler blade 135 will cause the spoiler blade 135 to rotate automatically. The rotation of the spoiler blade 135 can disturb the water, thereby improving the uniformity of the distribution of the desalted water inside the normal temperature membrane deaerator 1 and improving the deoxygenation efficiency.

[0039] See also Figure 4 The tube body 131 is a hollow tube structure with one end open and the other end sealed, and the material of the tube body 131 is stainless steel;

[0040] The stainless steel material has the advantages of corrosion resistance and high hardness, and can extend the service life of the liquid inlet pipe 13.

[0041] See also Figure 3 A filter filler 19 is fixedly installed inside the upper box body 11, the filter filler 19 is located above the membrane assembly 18, and the drain pipe 14 is located below the filter filler 19;

[0042] The membrane assembly 18 and the filter filler 19 can cooperate to perform double deoxygenation on the desalted water, thereby ensuring the deoxygenation effect.

[0043] Working principle: The deionized water from outside the boundary area passes through the normal temperature membrane deaerator 1, and after being deoxygenated at normal temperature, the deoxygenated water is pumped into the steam drum 3 by the water supply pump 2, and then the water in the steam drum 3 is pumped into the riser 5 by the circulating pump 4. The riser 5 is a heat exchange device. The deoxygenated water exchanges heat with the heat source in the riser 5. After producing a steam-water mixture, it returns to the steam drum 3. The steam-water mixture completes steam-water separation in the steam drum 3, and the steam enters the steam transmission pipeline 6. The water falls back to the bottom of the steam drum 3, thus completing the entire system circulation process.

Claims

1. A coke oven riser normal temperature membrane deoxidation waste heat recovery device, characterized in that: Including water deaeration components and waste heat recovery components; The water deoxygenation component comprises a normal temperature membrane deaerator (1) for normal temperature deoxygenation, a steam drum (3) for collecting deoxygenated water, and a feed water pump (2) for conveying the deoxygenated water to the interior of the steam drum (3); The waste heat recovery component comprises a riser (5) and a circulation pump (4) for extracting deoxygenated water from the steam drum (3) and transporting it to the riser (5); the deoxygenated water exchanges heat with a heat source in the riser (5) and returns to the steam drum (3); the steam drum (3) is also connected to a steam transport network (6) for transporting steam.

2. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 1, characterized in that: The normal temperature membrane deaerator (1) comprises a box body with a rectangular structure, a membrane assembly (18) is installed inside the box body, an upper liquid inlet pipe (13) is arranged on the left side wall of the box body, a lower liquid discharge pipe (14) is arranged on the right side wall of the box body, and an exhaust pipe (17) connected to its inner cavity is arranged on the top wall of the box body.

3. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 2, characterized in that: The membrane assembly (18) comprises a hollow cylinder and a plurality of microporous polypropylene hollow fiber air distribution tubes, wherein the hollow cylinder is fixedly installed inside the box, and the plurality of microporous polypropylene hollow fiber air distribution tubes are arranged in a surrounding manner inside the hollow cylinder to form a unit with a water inlet and an outlet and an air inlet and an outlet.

4. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 2, characterized in that: A vacuum and nitrogen purge pump (15) is fixedly installed on the side wall of the box body, and a connecting pipe (16) is fixedly connected to the output end of the vacuum and nitrogen purge pump (15), and the other end of the connecting pipe (16) is connected to the membrane assembly (18).

5. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 2, characterized in that: The box body comprises an upper box body (11) and a lower box body (12), and the upper box body (11) and the lower box body (12) are fixed by a plurality of sets of bolts.

6. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 2, characterized in that: The liquid inlet pipe (13) comprises a tube body (131) fixedly mounted on the upper part of the outer wall of the lower box body (12); a plurality of liquid discharge holes (132) are equidistantly provided on the outer wall of the tube body (131); a mounting seat (133) is fixedly mounted on the outer wall of the tube body (131); a mounting shaft (134) is fixedly mounted on the mounting seat (133); a flow spoiler (135) is rotatably mounted on the outer wall of the mounting shaft (134); the flow spoiler (135) is arranged corresponding to the liquid discharge hole (132).

7. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 6, characterized in that: The tube body (131) is a hollow tube structure with one end open and the other end sealed, and the material of the tube body (131) is stainless steel.

8. A coke oven riser normal temperature membrane deoxidation waste heat recovery device as claimed in claim 5, characterized in that: A filter filler (19) is fixedly installed inside the upper box body (11); the filter filler (19) is located above the membrane assembly (18), and the drain pipe (14) is located below the filter filler (19).

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