Flue gas purification device for heating furnace

Abstract

The utility model relates to a flue gas purification device for a heating furnace, which comprises a support frame fixed in a smoke box of the heating furnace; the filtering box is located on the supporting frame, a filtering object is contained in the filtering box, smoke entering the smoke box passes through the filtering box and is purified by the filtering object, and the gas quality of exhausted gas can be improved; the filter box is arranged in the smoke box, the cover plate is arranged on the side face of the smoke box, and when the cover plate is opened, the filter box is placed in or taken out of the smoke box, the space structure of the smoke box in an existing heating furnace is utilized, and the filter box in the smoke box can be placed, replaced and maintained by disassembling the cover plate on the side face of the smoke box; technical improvement is achieved under the condition that the whole heating furnace structure is not changed, and using benefits of the heating furnace are improved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas heating technology in oil and gas field operations, and particularly to a heating furnace flue gas purification device. Background Technology

[0002] The heating furnace is a tube-type indirect heating furnace, a specialized heating device for oil and gas fields, using water as the heat transfer medium. The furnace mainly consists of a cylinder, fire tubes, a gas coil, and other accessories. The gas coil is sealed to the inlet and outlet pipes of the cylinder with sealing packing, allowing the cylinder to communicate with the atmosphere. Natural gas, fuel, is drawn in at a certain ratio and mixed with air by the burner nozzles before being injected into the fire tubes for combustion. The high-temperature flame directly heats the fire tubes and the flue gas outlet pipe. Water near the fire tubes and flue gas outlet rises due to its decreased density after being heated, then cools and sinks after heat transfer with the gas coil, returning to the fire tubes and being heated again. This cycle continues, with the natural gas flowing through the gas coil continuously gaining heat and increasing in temperature, thus completing the heating process. The flue gas from the fire tubes and flue gas outlet enters the smoke box and is discharged into the atmosphere through the chimney. However, some polluting gases are also released with the flue gas and require purification.

[0003] Therefore, it is necessary to design a purification device to solve the above problems. Utility Model Content

[0004] This utility model provides a flue gas purification device for a heating furnace, including a support frame fixed inside the flue gas box of the heating furnace; a filter box located on the support frame, the filter box containing filter material, the flue gas entering the flue gas box passes through the filter box and is purified by the filter material; and a cover plate disposed on the side of the flue gas box, the filter box being placed into or removed from the flue gas box when the cover plate is opened.

[0005] In one embodiment, the filter box includes at least a first filter box and a second filter box. One first filter box is provided and is centrally located at the top of the cigarette box. Two second filter boxes are provided and are located below the first filter box, with the two second filter boxes spaced apart.

[0006] In one embodiment, in the connection direction of the two second filter boxes, the distance between the two second filter boxes is less than the length of the first filter box.

[0007] In one embodiment, an airflow channel is formed between the two second filter boxes, and an adjustment component is provided in the airflow channel, which can selectively open or close the airflow channel.

[0008] When the regulating component is adjusted to open the airflow channel, the flue gas passes through the airflow channel and is discharged after being filtered by the first filter box.

[0009] When the regulating component is adjusted to close the airflow channel, the flue gas is filtered by the second filter box, then filtered by the first filter box, and then discharged.

[0010] In one embodiment, the regulating assembly includes a partition located between the two second filter boxes, a valve stem connected to the partition and extending through the smoke box, and a handle connected to the valve stem, wherein rotating the handle rotates the partition to open or close the airflow passage.

[0011] In one embodiment, two third filter boxes are located below the second filter box, the third filter boxes being disposed corresponding to the second filter box, and the airflow channel extending between the two third filter boxes.

[0012] In one embodiment, the filtration accuracy of the filtered materials in the third filter box, the second filter box, and the first filter box increases sequentially.

[0013] In one embodiment, the first filter box, the second filter box, and the third filter box are filled with filter media of different properties.

[0014] In one embodiment, the surface of the filter box is a screen, and the pores of the screen are smaller than the diameter of the filter material being filled.

[0015] In one embodiment, a chimney is connected to the top of the smoke box, a burner is provided at the bottom of the smoke box, the burner is connected to a flue gas outlet pipe via a fire tube, the flue gas outlet pipe is connected to the smoke box, and a cover plate is provided at the end of the smoke box away from the flue gas outlet pipe.

[0016] Compared with existing technologies, the advantages of this invention are that a support frame is installed inside the smoke box of the heating furnace, and the filter box is placed on the support frame. The filter box contains filter material, which can purify the flue gas after combustion in the heating furnace, thus improving the quality of the exhaust gas. Furthermore, this invention utilizes the spatial structure of the existing smoke box in heating furnaces. The internal filter box can be placed, replaced, and maintained by removing the cover plate on the side of the smoke box, achieving technological improvement without altering the overall structure of the heating furnace and enhancing its operational efficiency. Attached Figure Description

[0017] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the side cross-section structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the filter box of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the adjustment component of this utility model;

[0022] Figure label:

[0023] 1. Filter box; 101. First filter box; 102. Second filter box; 103. Third filter box; 2. Support frame; 3. Adjustment assembly; 301. Partition plate; 302. Valve stem; 303. Handle; 4. Cylinder; 5. Water tank; 6. Gas coil; 7. Fire tube; 8. Flue gas outlet pipe; 9. Smoke box; 10. Burner; 11. Damper regulator; 12. Chimney; 13. Cover plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0027] like Figure 1 As shown, the heating furnace of this utility model includes a cylindrical body 4, a water tank 5 and a gas coil 6 are provided inside the cylindrical body 4, a smoke box 9 is located on one side of the cylindrical body 4, a chimney 12 is connected to the top of the smoke box 9, a burner 10 is provided at the bottom of the smoke box 9, a damper regulator 11 is provided at one end of the burner 10, the damper regulator 11 is located outside the smoke box 9, the other end of the burner 10 is connected to the flue gas outlet pipe 8 through a fire pipe 7, the flue gas outlet pipe 8 is connected to the smoke box 9, and a detachable cover plate 13 is provided at the end of the smoke box 9 away from the flue gas outlet pipe 8.

[0028] This utility model relates to a flue gas purification device for a heating furnace, comprising a support frame 2 fixed inside a flue gas chamber 9, and a filter box 1 located on the support frame 2. The filter box 1 contains filter media, and the flue gas entering the flue gas chamber 9 passes through the filter box 1 and is purified by the filter media. The filter box 1 is used to adsorb and filter the flue gas generated after the combustion of natural gas in the burner 10, such as sulfur dioxide, nitrogen oxides, dust, and particulate matter. Through the purification effect of the filter box 1, the quality of the emitted gas is improved, which is environmentally friendly.

[0029] Preferably, the surface of the filter box 1 is a screen, and the pores of the screen are smaller than the diameter of the filter material. The filter material is generally a large-particle solid adsorbent. When the filter box 1 is filled with adsorbent, the flue gas can pass through the gaps between the adsorbent particles, and the harmful gases or impurities are adsorbed and purified by the adsorbent. The purified flue gas is then discharged into the atmosphere. The four sides of the filter box 1 are all screens, thus increasing the adsorption area of ​​the filter material. In this embodiment, the screen is made of stainless steel. Since the flue gas has a high temperature, using a stainless steel screen can increase the service life of the filter box 1.

[0030] like Figure 1 As shown, a removable cover plate 13 is provided on the side of the smoke box 9. When the cover plate 13 is removed and opened, the filter box 1 can be placed into the support frame 2 inside the smoke box 9, or the filter box 1 can be taken out from the smoke box 9 for replacement or repair. This utility model utilizes the spatial structure of the smoke box 9 in the existing heating furnace. By removing the cover plate 13 on the side of the smoke box 9, the internal filter box 1 can be placed, replaced, and repaired. This achieves a technical improvement without changing the overall structure of the heating furnace, thereby improving the efficiency of the heating furnace.

[0031] Example 1

[0032] The filter box 1 includes a first filter box 101 and a second filter box 102. One first filter box 101 is centrally located at the top of the smoke box 9. Two second filter boxes 102 are located below the first filter box 101, spaced apart. The filter boxes 1 are arranged in two layers, with the upper layer centrally located and the lower layer symmetrically arranged, ensuring that each layer of filter box 1 can independently adsorb and filter the flue gas. In the connection direction of the two second filter boxes 102, the distance between the two second filter boxes 102 is less than the length of the first filter box 101. Therefore, when the flue gas passes through the channel between the two second filter boxes 102, it will at least pass through the first filter box 101 and be purified by it. The first filter box 101, as the final step in purification, can be filled with a high-quality adsorbent.

[0033] An airflow channel is formed between the two second filter boxes 102. An adjustment component 3 is provided in the airflow channel, which can selectively open or close the airflow channel. When the adjustment component 3 is adjusted to open the airflow channel, the flue gas passes through the airflow channel and is filtered by the first filter box 101 before being discharged. When the adjustment component 3 is adjusted to close the airflow channel, the flue gas is filtered by the second filter box 102 and then by the first filter box 101 before being discharged.

[0034] like Figure 4 As shown, the regulating component 3 includes a partition 301 located between the two second filter boxes 102, a valve stem 302 connected to the partition 301 and extending out of the flue gas box 9, and a handle 303 connected to the valve stem 302. Rotating the handle 303 rotates the partition 301 to open or close the airflow passage. Before starting the furnace, the partition 301 is opened to ensure unobstructed airflow, allowing cold air to flow along the airflow passage to the chimney 12. When the burner in the furnace begins operation, hot gas flows along the airflow passage through the first filter box 101 to the chimney and is discharged into the atmosphere. Once the temperature stabilizes, the partition 301 is closed, forcing the hot gas to pass through the second filter box 102 and the first filter box 101, where the filter media is adsorbed and filtered, completing the flue gas purification and improving the quality of the emitted gas.

[0035] The support frame 2 is fixed inside the smoke box 9. In this embodiment, the support frame 2 is welded to the side wall of the smoke box 9 or fixed to the side wall of the smoke box 9 by bolts. According to the structure of the smoke box 9, the support frame 2 is also set in two layers, supporting the first filter box 101 and the second filter box 102 respectively. In this embodiment, the support frame 2 is a steel frame, which can be angle steel, bar steel or steel frame, etc., which can not only stably support the filter box, but also withstand high-temperature flue gas and ensure service life.

[0036] like Figure 3 As shown, in this embodiment, the first filter box 101 and the two second filter boxes 102 are the same in shape and size. In other embodiments, the second filter boxes 102 with different sizes and shapes than the first filter box 101 can also be set according to the size of the cigarette box 9.

[0037] Example 2

[0038] like Figure 2As shown, the filter box 1 is configured with three layers, including a first filter box 101, a second filter box 102, and a third filter box 103 arranged sequentially from top to bottom within the smoke box 9. There is one first filter box 101, centrally located at the top of the smoke box 9. There are two second filter boxes 102, located below the first filter box 101, spaced apart, in the middle of the smoke box 9. There are also two third filter boxes 103, located at the bottom of the smoke box 9, corresponding to the second filter boxes 102. The three layers of filter boxes are configured with appropriate shape and size according to the shape of the heating furnace smoke box. The upper layer uses a centrally located first filter box 101 to isolate the chimney, ensuring that the flue gas can only be purified by the filter material in the first filter box 101 before being discharged into the atmosphere, thus guaranteeing the purification effect. The arrangement of the three layers of filter boxes 1 meets the treatment conditions of the heating furnace combustion exhaust gas and is beneficial to improving the quality of the exhaust gas.

[0039] like Figure 1 and Figure 2 As shown, the support frame 2 is fixed inside the smoke box 9. In Embodiment 2, the support frame 2 is welded to the side wall of the smoke box 9, or fixed to the side wall of the smoke box 9 by bolts. According to the structure of the smoke box 9, the support frame 2 is also set in three layers, supporting the first filter box 101, the second filter box 102, and the third filter box 103 respectively. In this embodiment, the support frame 2 is a steel frame, which can be angle steel, bar steel, or steel frame, etc., which can not only stably support the filter box, but also withstand high-temperature flue gas and ensure service life.

[0040] like Figure 3 As shown, in this embodiment, the first filter box 101, the second filter box 102, and the third filter box 103 are all the same in shape and size. In other embodiments, the second filter box 102 and the third filter box 103 may be set to different sizes and shapes from the first filter box 101, depending on the size of the cigarette box 9.

[0041] like Figure 2 As shown, an airflow channel is formed between the two second filter boxes 102 and the two third filter boxes 103. An adjustment component 3 is provided in the airflow channel, which can selectively open or close the airflow channel. When the adjustment component 3 is adjusted to open the airflow channel, the flue gas passes through the airflow channel and is filtered by the first filter box 101 before being discharged. When the adjustment component 3 is adjusted to close the airflow channel, the flue gas is filtered sequentially by the third filter box 103, the second filter box 102, and then filtered by the first filter box 101 before being discharged.

[0042] like Figure 4As shown, the regulating component 3 includes a partition 301 located between two second filter boxes 102 or two third filter boxes 103, a valve stem 302 connected to the partition 301 and extending out of the flue gas chamber 9, and a handle 303 connected to the valve stem 302. Rotating the handle 303 rotates the partition 301 to open or close the airflow passage. Before starting the furnace, the partition 301 is opened to ensure unobstructed airflow, allowing cold air to flow along the airflow passage to the chimney 12. When the burner in the furnace begins operation, hot gas flows along the airflow passage through the first filter box 101 to the chimney and is discharged into the atmosphere. Once the temperature stabilizes, the partition 301 is closed, forcing the hot gas to pass through the third filter box 103, the second filter box 102, and the first filter box 101. The filtered material is adsorbed and filtered, completing the flue gas purification and improving the quality of the emitted gas.

[0043] Different types of filter media can be filled into filter box 1. In one embodiment, the filtration precision of the filter media filled into the third filter box 103, the second filter box 102, and the first filter box 101 increases sequentially. For example, activated carbon adsorbents of different precision are placed. Therefore, when the flue gas passes through the third filter box 103, the second filter box 102, and the first filter box 101 in sequence, it undergoes a process from coarse filtration to fine filtration, purifying as many harmful gases and impurities in the flue gas as possible and enhancing the purification effect. In another embodiment, the first filter box 101, the second filter box 102, and the third filter box 103 are filled with filter media with different properties. For example, the third filter box 103 is filled with an adsorbent that can remove dust and particulate matter, while the second filter box 102 and / or the first filter box 101 are filled with an adsorbent that removes gases such as sulfur dioxide and nitrogen oxides. By selecting different filter media to fill the filter boxes according to the properties of the combustion gases, the applicability is improved.

[0044] Before the heating furnace is started, the first filter box 101 is installed below the chimney 12. The first filter box 101 is filled with large-particle adsorbent, allowing airflow to pass smoothly through the gaps in the adsorbent. At this time, the regulating component 3 is adjusted to open the baffle 301, opening the airflow channel and connecting it with the smoke and fire outlet pipe 8. During startup, due to the poor flow of cold air, the natural gas flow in the burner 10 is slow, affecting combustion efficiency. Opening the regulating component 3 can create an unobstructed channel for cold air, accelerating the flow of natural gas and improving combustion efficiency.

[0045] When the heating furnace starts up, fuel natural gas enters the fire tube 7 from the burner 10. The damper regulator 11 brings in outside air to mix with the burner 10, and the mixture burns in the fire tube 7. On one hand, the heat from combustion is transferred to the water in the water tank 5 through the flue gas outlet pipe 8 and the fire tube 7. The water nearby rises due to its decreased density after being heated, and sinks after heat transfer with the gas coil 6, and is heated again upon contact with the flue gas outlet pipe 8 and the fire tube 7. This cycle continues. At the same time, the natural gas flowing through the gas coil 6 continuously gains heat from the gas coil 6 and its temperature rises, completing the heating of the natural gas. On the other hand, the flue gas temperature rises after combustion and flows through the fire tube 7 and the flue gas outlet pipe 8 to the smoke box 9. It then enters the first filter box 101 through the airflow channel opened by the partition 301 and is discharged into the atmosphere through the chimney 12. During this process, the flue gas passes through the adsorption and filtration of the first filter box 101, but the exhaust quality still needs improvement.

[0046] Therefore, after the heating furnace has been running for a period of time and the water temperature in the water tank 5 and the overall temperature of the heating furnace have stabilized, the partition 301 between the third filter box 103 and the partition 301 between the second filter box 102 are closed in sequence, so that the flue gas can be adsorbed and filtered through the third filter box 103 and the second filter box 102. The flue gas that has been fully adsorbed and filtered then passes through the first filter box 101 and reaches the chimney 12 to be discharged into the atmosphere, thereby improving the quality of the flue gas from the heating furnace.

[0047] This utility model of flue gas purification device improves the quality of emitted flue gas by appropriately adding a support frame 2 and a filter box 1 within the space of the flue gas chamber 9 without altering the main structure of the heating furnace, thus being environmentally friendly. Furthermore, the box-type filter box 1 facilitates later replacement and maintenance, improving the efficiency of the heating furnace. The multi-layer filter box design, allowing for the placement of different adsorbents or filter elements according to different conditions, further enhances the quality of the exhaust gas.

[0048] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flue gas purification device for a heating furnace, characterized in that, include: The support frame is fixed inside the smoke box of the heating furnace; A filter box is located on the support frame. The filter box contains filter material. The flue gas entering the smoke box passes through the filter box and is purified by the filter material. A cover plate is provided on the side of the cigarette box. When the cover plate is opened, the filter box is placed into or removed from the cigarette box.

2. The furnace flue gas purification device according to claim 1, characterized in that, The filter box includes at least a first filter box and a second filter box. One first filter box is provided, which is centrally located at the top of the cigarette box. Two second filter boxes are provided, which are located below the first filter box and are spaced apart.

3. The furnace flue gas purification device according to claim 2, characterized in that: In the connection direction of the two second filter boxes, the distance between the two second filter boxes is less than the length of the first filter box.

4. The furnace flue gas purification device according to claim 2 or 3, characterized in that: An airflow channel is formed between the two second filter boxes, and an adjustment component is provided in the airflow channel, which can selectively open or close the airflow channel. When the regulating component is adjusted to open the airflow channel, the flue gas passes through the airflow channel and is discharged after being filtered by the first filter box. When the regulating component is adjusted to close the airflow channel, the flue gas is filtered by the second filter box, then filtered by the first filter box, and then discharged.

5. The furnace flue gas purification device according to claim 4, characterized in that: The regulating assembly includes a partition located between the two second filter boxes, a valve stem connected to the partition and extending out of the smoke box, and a handle connected to the valve stem. The partition is rotated by turning the handle to open or close the airflow passage.

6. The furnace flue gas purification device according to claim 4, characterized in that: It also includes two third filter boxes located below the second filter box, the third filter boxes being arranged corresponding to the second filter box, and the airflow channel extending between the two third filter boxes.

7. The furnace flue gas purification device according to claim 6, characterized in that: The filtration precision of the filtered materials in the third filter box, the second filter box, and the first filter box increases sequentially.

8. The furnace flue gas purification device according to claim 6, characterized in that: The first filter box, the second filter box, and the third filter box are filled with filter media of different properties.

9. The furnace flue gas purification device according to claim 1, characterized in that: The surface of the filter box is a screen, and the pores of the screen are smaller than the diameter of the filter material being filled.

10. The furnace flue gas purification device according to claim 1, characterized in that: The top of the smoke box is connected to a chimney, and the bottom of the smoke box is equipped with a burner. The burner is connected to a flue gas outlet pipe through a fire pipe. The flue gas outlet pipe is connected to the smoke box, and the cover plate is located at the end of the smoke box away from the flue gas outlet pipe.

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