Dual-purpose oil-rich steam heating system

Abstract

The invention discloses a dual-purpose rich oil steam heating system which comprises a first rich oil heat exchanger, a second rich oil heat exchanger and a filter box, the second rich oil heat exchanger is additionally arranged at the right end of the first rich oil heat exchanger, and a part of pipelines are added to achieve dual purposes of the system. One of an original first rich oil heat exchanger and an original second rich oil heat exchanger is changed into the rich oil preheater, the preheater and the heat exchanger are connected in series, the filter box is connected with the first rich oil heat exchanger, and the positioning assembly drives the filter screen to form a detachable structure in the filter box. The dual-purpose rich oil steam heating system can filter rich oil, can meet chemical production debenzolization requirements when steam produced by an ascending pipe waste heat system is insufficient due to the fact that the yield of a coke oven is greatly reduced, guarantees the coke oven gas quality, improves the crude benzene yield, increases economic benefits, only adds several valves and part of pipelines, and is low in cost and easy to popularize. The low-pressure steam system and the medium-pressure steam system do not interfere with each other and are stable, and the two working conditions can be switched at any time.

Description

Technical Field

[0001] The present invention relates to the technical field related to oil-rich steam heating, and in particular to a dual-purpose oil-rich steam heating system. Background Art

[0002] Rich oil refers to oil that is rich in hydrocarbons or benzenes absorbed during the chemical absorption process. As the coking industry is a major energy consumer, it is urgent to achieve capacity upgrades, energy conservation, environmental protection, and green manufacturing. The coke oven riser waste heat recovery system technology has become the standard for new coke ovens and coke oven renovations in the coking industry. In addition, because the tubular furnaces used for ammonia steaming and debenzenization have major safety hazards, pollute the environment, and waste gas resources, it is inevitable to use the steam generated by the coke oven riser waste heat recovery technology to replace the tubular furnaces.

[0003] Through heat exchange, medium-pressure saturated steam of 1.2-1.6MPa is produced. Part of it is decompressed and enters the deaerator of this system for deoxygenation; part of it enters the oil-rich heat exchanger to heat the rich oil to 180℃; part of it enters the riser for secondary superheating to produce superheated steam above 400℃, which enters the oil wash regenerator to regenerate the wash oil; the remaining saturated steam is merged into the external pipeline network, completing the effect of completely replacing the tubular furnace. In the current system process, after the steam entering the oil-rich heat exchanger undergoes heat exchange, the cooled condensate enters the oil-rich condensate tank and is pumped back to the steam drum for reuse by a condensate pump. This not only saves desalted water, but also recovers the heat of the condensate, thereby improving the steam production rate of the riser waste heat system.

[0004] For example, announcement number CN112280587A discloses an oil-rich debenzenization heating system, comprising a heat exchanger, wherein the heat exchanger's heated fluid inlet is connected to an oil-rich inlet pipe, the heat exchanger's heated fluid outlet is connected to an oil-rich outlet pipe, the other end of the oil-rich outlet pipe is connected to a debenzenization tower, a temperature sensor is provided on the oil-rich outlet pipe, the heat transfer fluid inlet of the heat exchanger is connected to a superheated steam pipe, the other end of the superheated steam pipe is connected to a steam boiler, the heat transfer fluid outlet of the heat exchanger is connected to a condensate pipe, the other end of the condensate pipe is connected to a low-pressure flash tank. This heating system occupies a small area, is safe and environmentally friendly, does not produce sulfur, nitrogen oxides and other harmful gases, avoids the dangers of burning coal gas, saves costs and improves economic benefits;

[0005] For example, announcement number CN218916052U discloses a system for heating rich oil with saturated steam instead of a traditional tubular furnace, including an oil-rich heat exchanger, a flash tank, an oil circulation pipeline, a PLC controller, and a regulating unit. The heat exchange inlet of the oil-rich heat exchanger is connected to a steam pipeline, and the heat exchange outlet of the oil-rich heat exchanger is connected to a flash tank. The oil circuit of the oil-rich heat exchanger is connected to the oil circulation pipeline. The regulating unit is set on the steam pipeline to regulate the steam flow. The regulating unit is connected to the PLC controller. By setting up temperature and pressure acquisition modules, precise temperature and pressure control is achieved when using saturated steam instead of a tubular furnace to heat rich oil, avoiding the low precision of manual operation and improving the safety and intelligence of the entire system.

[0006] However, the existing oil-rich steam heating system still has the following shortcomings:

[0007] It is inconvenient to carry out preliminary treatment of rich oil. Rich oil contains impurities and dirt. After a long period of coking time, the steam produced cannot meet the requirements of superheated steam and rich oil heating at the same time. The rich oil outlet temperature is low, the debenzenization effect is poor, the crude benzene yield decreases, the benzene content in the coke oven gas increases, and it is easy to clog the orifice plate or pipeline, which increases the difficulty of cleaning benzene impurities in the subsequent process.

[0008] Therefore, we propose a dual-purpose oil-rich steam heating system to solve the above problems. Summary of the Invention

[0009] The object of the present invention is to provide a dual-purpose oil-rich steam heating system to solve the problem raised in the above-mentioned background technology that it is inconvenient to perform preliminary treatment of the rich oil, the rich oil contains impurities and dirt, and after a long period of coking time, the steam produced cannot simultaneously meet the requirements of superheated steam volume and rich oil heating. The rich oil outlet temperature is low, the debenzenization effect is poor, the crude benzene yield decreases, the benzene content in the coke oven gas increases, and the orifice plate or pipeline is easily blocked, which increases the difficulty of cleaning benzene impurities in the subsequent process.

[0010] To achieve the above object, the present invention provides the following technical solution: a dual-purpose oil-rich steam heating system, comprising a first oil-rich heat exchanger, a second oil-rich heat exchanger and a filter box;

[0011] Also includes:

[0012] A second oil-rich heat exchanger is installed at the right end of the first oil-rich heat exchanger. At the same time, an oil-rich valve, a steam valve, and a dedicated steam trap are added, and part of the pipeline is added to realize dual-use of the system. By opening and closing the valve, one of the original first oil-rich heat exchanger and the second oil-rich heat exchanger is converted into an oil-rich preheater, and the preheater and the heat exchanger are connected in series.

[0013] The filter box is connected to the first oil-rich heat exchanger, and a filter screen for filtering the rich oil is installed in the middle of the filter box, and positioning components are provided on the front and rear sides of the upper end of the filter screen. The positioning components include fixed connecting plates fixed to the front and rear sides of the upper end of the filter box, a movable connecting plate telescopically connected to the fixed connecting plate, and a movable cover plate rotatably connected to the upper end of the movable connecting plate;

[0014] The positioning assembly drives the filter screen to form a disassembly structure in the filter box.

[0015] Preferably, a sealing gasket is provided between the upper end of the filter screen and the filter box.

[0016] Preferably, a reduction motor is installed on the left side of the filter box, and the output end of the reduction motor is fixedly connected to a cleaning brush through a mechanical seal, and the reduction motor drives the cleaning brush to rotate slowly in the filter box.

[0017] Preferably, the cleaning brush is arranged on the left side of the filter screen, and the cleaning brush scrapes off dirt and impurities attached to the filter screen.

[0018] Preferably, the movable cover is respectively engaged with the front and rear sides of the upper end of the filter, and the middle portion of the movable cover is plug-connected with the fixed protrusion fixed to the upper end of the filter.

[0019] Preferably, a movable connecting rod is fixedly connected to the outer side of the fixed connecting plate, and the movable connecting rod and the fixed connecting plate are connected by a slot, an up and down sliding structure is formed between the movable connecting rod and the fixed connecting plate, and the outer surface of the movable connecting rod is threadedly connected to a fixed connecting cap.

[0020] Preferably, the fixed connecting cap is fitted with a fixed baffle with an "L" structure near a section of the fixed connecting plate, and a forward and backward sliding structure is formed between the fixed baffle and the movable connecting rod, and the lower end of the fixed baffle is fitted with the bottom of the fixed connecting plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the dual-purpose oil-rich steam heating system can filter the rich oil by setting the filter screen, and combined with the setting of the positioning component, the filter screen can be disassembled and cleaned to prevent the filter screen from being blocked during long-term use. By using the low-pressure steam on site, without adding a heat exchanger, the system can be transformed into a dual-purpose oil-rich heating system by adding a small number of valves and pipes. When the self-produced steam output is sufficient, it can be used normally. When the self-produced steam output is insufficient after the coke oven production is greatly reduced, the low-pressure steam can be used first by switching the valve. Steam first heats the cold rich oil from about 120℃ to 140-150℃, and then uses self-produced medium-pressure steam to heat the rich oil to about 180℃, meeting the requirements for debenzenization of the rich oil, ensuring the crude benzene yield and efficiency, and realizing dual-use of one system. When the coke oven production is greatly reduced and the steam production of the riser waste heat system is insufficient, the requirements for debenzenization of chemical products can be met, which not only ensures the quality of coke oven gas, but also improves the crude benzene yield and increases economic benefits. Only a few valves and some pipelines are added, which is low-cost. The low-pressure and medium-pressure steam systems do not interfere with each other, the system is stable, and the two working conditions can be switched at any time.

[0022] 1. Equipped with a filter box and a filter screen. The filter screen is plugged into the filter box. Through the setting of the filter screen, the dirt in the rich oil can be filtered. In addition, the sealing gasket is fitted between the filter screen and the filter box to improve the sealing of the connection.

[0023] 2. A positioning assembly is provided. The positioning assembly is symmetrically arranged on the front and rear sides of the upper end of the filter box. The positioning assembly includes a fixed connecting plate, a movable connecting plate and a movable cover. The arrangement of the positioning assembly facilitates the removal, cleaning and replacement of the filter screen, preventing the filter screen from being blocked during long-term use.

[0024] 3. A first oil-rich heat exchanger and a second oil-rich heat exchanger are provided. The second oil-rich heat exchanger is installed on the right end of the first oil-rich heat exchanger. One of the original first oil-rich heat exchanger and the second oil-rich heat exchanger is changed into an oil-rich preheater. The preheater and the heat exchanger are connected in series, and part of the pipeline is added to realize dual use of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the process structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the front view structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall structure of the filter box and filter screen of the present invention;

[0028] Figure 4 This is a schematic diagram of the front view and cross-section structure of the filter box, filter screen, reduction motor and cleaning brush of the present invention;

[0029] Figure 5 This is a schematic diagram of the overall structure of the filter screen, reduction motor and cleaning brush of the present invention;

[0030] Figure 6 For the present invention Figure 3 A in the middle is an enlarged structural diagram;

[0031] Figure 7 This is a structural diagram of the filter screen and filter box of the present invention in a disassembled state;

[0032] Figure 8 It is a bottom view structural diagram of the fixed connecting plate, movable connecting plate, movable cover plate and fixed baffle of the present invention.

[0033] In the figure: 1. First oil-rich heat exchanger; 2. Second oil-rich heat exchanger; 3. Filter box; 4. Filter screen; 5. Sealing gasket; 6. Reducer motor; 7. Cleaning brush; 8. Fixed protrusion; 9. Fixed connecting plate; 10. Movable connecting plate; 11. Movable cover; 12. Movable connecting rod; 13. Fixed connecting cap; 14. Fixed baffle. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figures 1-8 , the present invention provides the following technical solutions:

[0036] In order to solve the problem in the prior art that it is inconvenient to perform preliminary treatment on rich oil, rich oil contains impurities and dirt, and after a long period of coking time, the steam produced cannot meet the requirements of superheated steam and rich oil heating at the same time, the rich oil outlet temperature is low, the debenzenization effect is poor, the crude benzene yield decreases, the benzene content in the coke oven gas increases, and it is easy to clog the orifice plate or pipeline, which increases the difficulty of cleaning benzene impurities in the subsequent process. Therefore, the present invention adopts the following technical scheme, a dual-purpose rich oil steam heating system, which is provided with a first rich oil heat exchanger 1, a second rich oil heat exchanger 2 and a filter box 3, and the second rich oil heat exchanger 2 is installed at the right end of the first rich oil heat exchanger 1, and at the same time, rich oil valves, steam valves and special dredging are added. A water valve and part of the pipeline realize dual use of the system. By opening and closing the valve, one of the original first oil-rich heat exchanger 1 and the second oil-rich heat exchanger 2 is converted into an oil-rich preheater, and the preheater and the heat exchanger are connected in series. The filter box 3 is connected to the first oil-rich heat exchanger 1, and a filter screen 4 for filtering the rich oil is installed in the middle of the filter box 3. Positioning components are provided on both the front and rear sides of the upper end of the filter screen 4. The positioning components include fixed connecting plates 9 fixed to the front and rear sides of the upper end of the filter box 3, a movable connecting plate 10 telescopically connected to the fixed connecting plate 9, and a movable cover plate 11 rotatably connected to the upper end of the movable connecting plate 10. The positioning component drives the filter screen 4 to form a disassembly structure in the filter box 3;

[0037] like Figure 1 、 Figure 2 and Figure 3 As shown, the rich oil enters the filter box 3, and a filter screen 4 is installed in the filter box 3. The rich oil is processed by the filter screen 4, and a sealing gasket 5 is provided between the upper end of the filter screen 4 and the filter box 3. The setting of the sealing gasket 5 ensures the sealing effect of the connection. In addition, during the filtering process, the cleaning brush 7 is driven to rotate slowly in the filter box 3 by starting the reduction motor 6. The cleaning brush 7 is fitted at the left end of the filter screen 4 to scrape off the dirt and impurities attached to the filter screen 4, thereby keeping the entire filtration unobstructed and increasing Valves and some pipelines, under normal circumstances, the heat exchanger directly uses medium-pressure steam to heat the rich oil, and the two heat exchangers are one open and one standby; when the medium-pressure steam volume is insufficient and preheating is required, the two heat exchangers are used at the same time, and the original first rich oil heat exchanger 1 becomes a preheater, the following ①- Both indicate valves.

[0038] Direct heating with medium-pressure steam: When the first oil-rich heat exchanger 1 is in use, the valve opening and closing states are as follows:

[0039] Open: ①②③ ⑥; ⑦⑧ ⑨⑩

[0040] close: ④⑤;

[0041] When preheating is required: first use low-pressure steam to heat the rich oil from 120℃ to 140-150℃ in a preheater, and then use medium-pressure steam to heat the rich oil to 180℃ through a rich oil heat exchanger.

[0042] The valve status is as follows:

[0043] Open: ①②③⑥; ⑦⑧⑨⑩

[0044] close:

[0045] Rich oil path: Rich oil at about 120℃ from the outside enters through main valve ①, first passes through ② to enter the rich oil preheater, and is heated to 140-150℃, then passes through ④, and is heated to 180℃ in the rich oil heat exchanger, and then passes through ⑤ and the outlet main valve ⑥ to go to the debenzene tower.

[0046] Steam path: Note that low-pressure steam and high-pressure steam cannot be mixed.

[0047] Low-pressure steam: Low-pressure steam produced by chemical industry, passes through valve Then it enters the oil-rich waste heat tank through valve ⑨, and after heating the oil, the cooled condensed water passes through valve ⑩. and steam traps Then take out.

[0048] Medium pressure steam: The medium pressure steam from the riser waste heat passes through valve ⑦ and regulating valve ⑧ and then passes through valve Entering the oil-rich heat exchanger, after heating the rich oil, the cooled condensed water passes through the valve and steam traps It enters the condensate tank and is then pumped back to the steam drum of the riser waste heat system through the condensate pump.

[0049] In addition, after use, if Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, by rotating the fixed connecting cap 13 threadedly connected to the outer surface of the movable connecting rod 12, the fixed connecting cap 13 is disengaged from the fixed baffle 14, thereby releasing the limit between the fixed baffle 14 and the movable connecting rod 12, and then pulling the fixed baffle 14 outward to slide between the fixed baffle 14 and the movable connecting rod 12, the fixed baffle 14 is disengaged from the fixed connecting plate 9, thereby releasing the limit between the movable connecting rod 12 and the fixed connecting plate 9, and then pulling the movable connecting rod 12 upward, the movable connecting rod 12 and the fixed connecting plate 9 are released. The movable cover 11 is disengaged from the fixed protrusion 8, thereby releasing the limit on the filter screen 4, and then rotating the movable cover 11. The movable cover 11 is rotated at the upper end of the movable connecting plate 10 and moves away from above the filter screen 4 without interfering with the filter screen 4, and then the filter screen 4 is moved out upward, thereby facilitating the disassembly, cleaning and replacement of the filter screen 4.

[0050] The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field. The standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connections adopt conventional connection methods in the existing technology, which will not be described in detail here.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual-purpose oil-rich steam heating system, comprising a first oil-rich heat exchanger (1), a second oil-rich heat exchanger (2) and a filter box (3); It is characterized by: Also includes: A second oil-rich heat exchanger (2) is installed at the right end of the first oil-rich heat exchanger (1), and an oil-rich valve, a steam valve and a special steam trap are added, and part of the pipeline is added to realize dual-use of the system. By opening and closing the valve, one of the original first oil-rich heat exchanger (1) and the second oil-rich heat exchanger (2) is converted into an oil-rich preheater, and the preheater and the heat exchanger are connected in series; The filter box (3) is connected to the first oil-rich heat exchanger (1), and a filter screen (4) for filtering the rich oil is installed in the middle of the filter box (3), and positioning components are provided on both the front and rear sides of the upper end of the filter screen (4), and the positioning components include a fixed connecting plate (9) fixed to the front and rear sides of the upper end of the filter box (3), a movable connecting plate (10) telescopically connected to the fixed connecting plate (9), and a movable cover plate (11) rotatably connected to the upper end of the movable connecting plate (10); The positioning assembly drives the filter screen (4) to form a disassembly structure in the filter box (3).

2. A dual-purpose oil-rich steam heating system according to claim 1, characterized in that: A sealing gasket (5) is provided between the upper end of the filter screen (4) and the filter box (3).

3. The dual-purpose oil-rich steam heating system according to claim 1, characterized in that: A reduction motor (6) is installed on the left side of the filter box (3), and the output end of the reduction motor (6) is fixedly connected to a cleaning brush (7) through a mechanical seal, and the reduction motor (6) drives the cleaning brush (7) to rotate slowly in the filter box (3).

4. A dual-purpose oil-rich steam heating system according to claim 3, characterized in that: The cleaning brush (7) is arranged on the left side of the filter screen (4), and the cleaning brush (7) scrapes off dirt and impurities attached to the filter screen (4).

5. The dual-purpose oil-rich steam heating system according to claim 1, characterized in that: The movable cover plate (11) is respectively engaged with the front and rear sides of the upper end of the filter screen (4), and the middle portion of the movable cover plate (11) is plug-connected with the fixed protrusion (8) fixed to the upper end of the filter screen (4).

6. The dual-purpose oil-rich steam heating system according to claim 1, characterized in that: The outer side of the fixed connecting plate (9) is fixedly connected with a movable connecting rod (12), and the movable connecting rod (12) and the fixed connecting plate (9) are connected by a slot, and an up and down sliding structure is formed between the movable connecting rod (12) and the fixed connecting plate (9), and the outer surface of the movable connecting rod (12) is threadedly connected with a fixed connecting cap (13).

7. The dual-purpose oil-rich steam heating system according to claim 6, characterized in that: A fixed baffle (14) with an L-shaped structure is provided on a section of the fixed connection cap (13) close to the fixed connection plate (9), and a front-to-back sliding structure is formed between the fixed baffle (14) and the movable connection rod (12), and the lower end of the fixed baffle (14) is in contact with the bottom of the fixed connection plate (9).

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