Wastewater treatment mechanism of steam thermal cracking furnace

Abstract

The utility model discloses a wastewater treatment mechanism of a steam thermal cracking furnace, which comprises a bottom plate, and the bottom plate is provided with a coagulation tank, a settling tank, a clear water tank I, a sand filter tower, a carbon filter tower, a softening machine and a clear water tank II which are sequentially connected through liquid guide pipes; the coagulation tank is connected with a liquid inlet pipe; the liquid inlet pipe is used for conveying wastewater generated after oil-water separation into the coagulation tank; the coagulation box is connected with a flocculating agent adding mechanism and a first PH adjusting mechanism, and the flocculating agent adding mechanism is used for adding a flocculating agent into the coagulation box; the first PH adjusting mechanism is used for increasing the PH value of the wastewater, so that the wastewater is weakly alkaline; the clear water tank I is connected with a second PH adjusting mechanism, and the second PH adjusting mechanism is used for reducing the PH value in the wastewater; the device further comprises a controller, and the flocculant adding mechanism, the first PH adjusting mechanism and the second PH adjusting mechanism are all electrically connected with the controller. According to the utility model, the wastewater subjected to oil-water separation is subjected to coagulating sedimentation, filtration, softening and PH regulation, so that the wastewater reaches the discharge standard, and the environmental pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment mechanism for a steam pyrolysis furnace. Background Technology

[0002] Steam cracking furnaces are crucial equipment in the petrochemical industry, primarily used for the thermal cracking of petroleum hydrocarbons. Through the synergistic effect of high temperature and steam, they facilitate complex chemical reactions in hydrocarbon feedstocks with relatively large molecular weights and high boiling points, transforming them into smaller molecule products such as olefins with relatively small molecular weights and low boiling points.

[0003] During the operation of a steam pyrolysis furnace, gas is generated. The pyrolysis gas is condensed through a gas condensation system, and the condensation produces an oil-water mixture. The oil and water are separated by an oil skimmer. The separated oil can be used as fuel oil for power generation. However, the separated water contains a large number of impurities and does not meet the wastewater discharge standards. Direct discharge of the wastewater will cause environmental pollution. Therefore, in order to solve the above problems, this application proposes a wastewater treatment mechanism for steam pyrolysis furnaces. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a steam pyrolysis furnace wastewater treatment device for coagulating, settling, filtering, softening, and pH adjusting the wastewater after oil-water separation, so that the wastewater meets the discharge standards and avoids environmental pollution.

[0005] This utility model provides a wastewater treatment mechanism for a steam pyrolysis furnace, including a base plate, on which a coagulation tank, a sedimentation tank, a first clear water tank, a sand filter tower, a carbon filter tower, a softener, and a second clear water tank are sequentially connected by a liquid guide pipe.

[0006] The coagulation tank is connected to a liquid inlet pipe, which is used to transport the wastewater generated after oil-water separation into the coagulation tank.

[0007] The coagulation tank is connected to a flocculant dosing mechanism and a first pH adjustment mechanism. The flocculant dosing mechanism is used to add flocculant into the coagulation tank. After the flocculant is mixed with the wastewater, it enters the sedimentation tank for sedimentation. The first pH adjustment mechanism is used to increase the pH value of the wastewater, making the wastewater weakly alkaline.

[0008] The clean water tank is connected to a second pH adjustment mechanism, which is used to reduce the pH value of the wastewater.

[0009] It also includes a controller, and the flocculant dosing mechanism, the first pH adjustment mechanism and the second pH adjustment mechanism are all electrically connected to the controller.

[0010] Furthermore, the flocculant dosing mechanism includes a flocculant storage tank, which is connected to the coagulation tank via a first dosing pipe. A first dosing pump is installed on the first dosing pipe, and the first dosing pump is electrically connected to the controller.

[0011] Furthermore, the first pH adjustment mechanism includes a first storage tank containing sodium hydroxide solution. The first storage tank is connected to the coagulation tank via a second dosing pipe, and a second dosing pump is installed on the second dosing pipe. The second dosing pump is electrically connected to the controller.

[0012] Furthermore, the second pH adjustment mechanism includes a second storage tank containing hydrochloric acid solution. The second storage tank is connected to the clean water tank via a third dosing pipe. A third dosing pump is installed on the third dosing pipe and is electrically connected to the controller.

[0013] Furthermore, an overflow port 1 is provided on the upper side wall of the first clear water tank, and an overflow port 2 is provided on the upper side wall of the second clear water tank. The overflow port 1 is connected to the sand filter tower through a liquid guide pipe. A liquid level sensor 1 is provided on the inner wall of the first clear water tank above the overflow port 1, and a liquid level sensor 2 is provided on the inner wall of the second clear water tank above the overflow port 2. Both the liquid level sensor 1 and the liquid level sensor 2 are electrically connected to the controller.

[0014] Furthermore, both the first and second clean water tanks are connected to an inlet pipe, and a valve is installed on the inlet pipe. The valve is electrically connected to the controller and is used to deliver clean water into the first or second clean water tank.

[0015] Furthermore, the coagulation tank is also equipped with a stirring mechanism, which includes a stirring shaft arranged vertically inside the coagulation tank. Multiple sets of stirring blades are evenly arranged on the outer wall of the stirring shaft along its circumference. One end of the stirring shaft is connected to a motor that drives its rotation.

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

[0017] (1) This utility model adds flocculant to the coagulation tank through a flocculant dosing mechanism. After the flocculant is fully mixed with the wastewater, it enters the sedimentation tank for sedimentation to remove micro-toxic substances and heavy metal ions from the wastewater. A sodium hydroxide solution is delivered to the coagulation tank through a first pH adjustment mechanism to neutralize the acidic wastewater. A hydrochloric acid solution is added to the first clear water tank through a second pH adjustment mechanism to neutralize the slightly alkaline wastewater after the first pH adjustment, so as to avoid the pH value being too high and to make the wastewater meet the discharge standards. The wastewater is filtered through a sand filter tower and a carbon filter tower to further remove oxidizing substances, suspended solids and other fine particles from the wastewater. The wastewater is softened by a softener to reduce the hardness of the wastewater. The wastewater is purified to avoid direct discharge of wastewater and pollution of the environment. The wastewater that meets the discharge standards enters the second clear water tank and can be discharged externally or re-enter the steam cracking furnace.

[0018] (2) In addition to adding flocculant to the coagulation tank, this utility model also adds sodium hydroxide solution to the coagulation tank. Sodium hydroxide can be used as an adjuvant of coagulator. By adjusting the pH value of wastewater, the coagulation effect is enhanced, so that the flocculant can play its role in the optimal pH range, further improving the coagulation effect and effectively adsorbing suspended solids, colloids and other impurities in wastewater.

[0019] (3) This utility model adds a stirring mechanism to the coagulation tank, which makes the flocculant and wastewater fully mixed and improves the coagulation effect.

[0020] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a perspective view of the present utility model;

[0023] Figure 2 This is a partial top view of the structure of this utility model;

[0024] Figure 3 This is a process flow diagram of the present invention;

[0025] The diagram is labeled as follows: 1. Base plate; 2. Coagulation tank; 3. Sedimentation tank; 4. Clear water tank one; 5. Sand filter tower; 6. Carbon filter tower; 7. Softener; 8. Clear water tank two; 9. Flocculant dosing mechanism; 10. First pH adjustment mechanism; 11. Second pH adjustment mechanism; 12. Stirring mechanism;

[0026] 201. Liquid inlet pipe;

[0027] 401. Overflow port 1; 402. Liquid level sensor 1; 403. Inlet pipe;

[0028] 801. Overflow port two; 802. Liquid level sensor two;

[0029] 901. Flocculant storage tank; 902. First dosing pipe; 903. First dosing pump;

[0030] 1001. First drug storage tank; 1002. Second drug dosing pipe; 1003. Second drug dosing pump;

[0031] 1101. Second drug storage tank; 1102. Third drug dosing pipe; 1103. Third drug dosing pump;

[0032] 1201. Agitator blades; 1202. Motor. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0034] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Please refer to Figures 1-3 The present invention provides a wastewater treatment mechanism for a steam pyrolysis furnace, including a base plate 1, on which a coagulation tank 2, a sedimentation tank 3, a first clear water tank 4, a sand filter tower 5, a carbon filter tower 6, a softener 7, and a second clear water tank 8 are arranged in sequence via liquid guide pipes.

[0036] The coagulation tank 2 is connected to an inlet pipe 201, which is used to transport the wastewater generated after oil-water separation into the coagulation tank 2. Specifically, the coagulation tank 2 is connected to a collection tank through the inlet pipe 201. The collection tank contains an oil-water mixture generated after the waste gas is condensed. An oil skimming device is installed in the collection tank. Based on the density difference between oil and water, the oil skimming device separates the oil and water. The separated oil is collected, and the separated wastewater enters the coagulation tank 2.

[0037] The coagulation tank 2 is connected to a flocculant dosing mechanism 9 and a first pH adjustment mechanism 10. The flocculant dosing mechanism 9 is used to add flocculant into the coagulation tank 2. After the flocculant is mixed with the wastewater, it enters the sedimentation tank 3 for sedimentation. The first pH adjustment mechanism 10 is used to raise the pH value of the wastewater to make the wastewater weakly alkaline. Specifically, PAC or PAM solution is selected as the flocculant to adsorb colloids and particulate matter in the wastewater and remove micro-toxic substances and heavy metal ions from the wastewater.

[0038] The clean water tank 4 is connected to a second pH adjustment mechanism 11, which is used to lower the pH value of the wastewater.

[0039] It also includes a controller, a flocculant dosing mechanism 9, a first pH adjustment mechanism 10, and a second pH adjustment mechanism 12, all of which are electrically connected to the controller.

[0040] In this embodiment, the wastewater obtained after oil-water separation enters the coagulation tank 2 through the inlet pipe 201. Flocculant (PAC or PAM solution) is added to the coagulation tank 2 through the flocculant dosing mechanism 9. After the flocculant is fully mixed with the wastewater, it adsorbs suspended solids, colloids, and other impurities in the wastewater. While the flocculant is mixing with the wastewater, the first pH adjustment mechanism 10 delivers sodium hydroxide solution to the coagulation tank 2 to neutralize the acidic wastewater. The sodium hydroxide solution also acts as an adjuvant to the coagulation agent, enhancing the coagulation effect by adjusting the pH value of the wastewater, allowing the flocculant to function within the optimal pH range, further improving the coagulation effect. After the flocculant and wastewater are fully mixed, the mixture enters the sedimentation tank 3 for sedimentation, removing trace toxic substances and heavy metal ions from the wastewater. After sedimentation for a period of time, the supernatant in the sedimentation tank 3 enters the first clear water tank 4. Hydrochloric acid solution is added to the second clear water tank 4 through the second pH adjustment mechanism 11. This system is used to neutralize wastewater that is weakly alkaline after the initial pH adjustment, preventing the pH value from becoming too high and ensuring that the wastewater meets the discharge pH standard. After pH adjustment, the wastewater sequentially enters sand filter tower 5 and carbon filter tower 6, where it is filtered to further remove oxidizing substances, suspended solids, and other fine particles. The wastewater after filtration in carbon filter tower 6 enters softener 7, which contains softening resin. The sodium ions in the softening resin can react with the calcium and magnesium ions in the wastewater, displacing them and reducing the hardness of the water, thus softening the wastewater. The softened wastewater then enters clear water tank 2. This application achieves wastewater purification through coagulation sedimentation, pH adjustment, filtration, and softening, preventing direct discharge of wastewater and environmental pollution. The water in clear water tank 2 can be discharged externally or re-enter the steam cracking furnace.

[0041] Furthermore, the flocculant dosing mechanism 9, the first pH adjustment mechanism 10, and the second pH adjustment mechanism 11 of this application are all electrically connected to the controller, which automatically realizes the flocculant dosing and pH adjustment process, thereby improving the convenience of sewage treatment in sewage treatment facilities.

[0042] In a preferred embodiment, such as Figure 2 As shown, the flocculant dosing mechanism 9 includes a flocculant storage tank 901, which is connected to the coagulation tank 2 via a first dosing pipe 902. A first dosing pump 903 is installed on the first dosing pipe 902 and is electrically connected to the controller. Specifically, the first dosing pump 903 enables automatic dosing of flocculant.

[0043] In a preferred embodiment, such as Figure 2 As shown, the first pH adjustment mechanism 10 includes a first storage tank 1001 containing sodium hydroxide solution. The first storage tank 1001 is connected to the coagulation tank 2 via a second dosing pipe 1002. A second dosing pump 1003 is installed on the second dosing pipe 1002 and is electrically connected to a controller. Specifically, the second dosing pump 1003 automatically adds sodium hydroxide solution to adjust the pH of the wastewater in the coagulation tank 2, making the wastewater weakly alkaline. The sodium hydroxide solution can also act as an additive to the coagulant, enhancing the coagulation effect by adjusting the pH of the wastewater, allowing the flocculant to function within the optimal pH range, and further improving the coagulation effect.

[0044] In a preferred embodiment, such as Figure 2 As shown, the second pH adjustment mechanism 11 includes a second storage tank 1101, which stores hydrochloric acid solution. The second storage tank 1101 is connected to the clean water tank 4 via a third dosing pipe 1102. A third dosing pump 1103 is installed on the third dosing pipe 1102 and is electrically connected to the controller. Specifically, the third dosing pump 1102 automatically adds hydrochloric acid solution to further adjust the pH value of the wastewater to meet the discharge standards.

[0045] In a preferred embodiment, such as Figure 2As shown, an overflow port 401 is provided on the upper side wall of the first water tank 4, and an overflow port 801 is provided on the upper side wall of the second water tank 8. The overflow port 401 is connected to the sand filter tower 5 through a liquid guide pipe. A liquid level sensor 402 is provided on the inner wall of the first water tank 4 above the overflow port 401, and a liquid level sensor 802 is provided on the inner wall of the second water tank 8 above the overflow port 801. Both the liquid level sensor 402 and the liquid level sensor 802 are electrically connected to the controller. Specifically, the wastewater in the first clean water tank 4 is mixed with hydrochloric acid solution and flows from the overflow port 401 into the sand filter tower 5 for filtration. After filtration in the sand filter tower 5, the wastewater passes through the carbon filter tower 6 and the softener 7 in sequence, and then enters the second clean water tank 8 for storage. The overflow port 801 can be connected to the guide pipe to discharge the treated wastewater that meets the standards or to re-enter the steam cracking furnace. The wastewater flows out automatically through the overflow port 401 or the overflow port 801, avoiding the use of a water pump, simplifying the equipment structure and reducing equipment costs. Moreover, the overflow ports 401 and 801 are both located above the side wall of the corresponding cleaning tank, which allows the residual sediment in the wastewater to settle better at the bottom of the cleaning tank 4 or the cleaning tank 8, improving the sewage treatment effect.

[0046] In a preferred embodiment, such as Figure 2 As shown, both clean water tank 4 and clean water tank 8 are connected to inlet pipes 403. Valves are installed on the inlet pipes 403, and these valves are electrically connected to the controller to deliver clean water into clean water tank 4 and clean water tank 8. Specifically, when wastewater in cleaning tank 4 or cleaning tank 8 needs to be discharged, the water level in cleaning tank 4 is detected by level sensor 402, and the water level in cleaning tank 8 is detected by level sensor 802. When the water level is lower than the overflow port 401, the controller controls the inlet pipe 403 connected to clean water tank 4 to introduce water, replenishing cleaning tank 4 and causing the wastewater level to rise and be discharged through overflow port 401. When the water level is lower than the overflow port 801, the controller controls the inlet pipe 403 connected to clean water tank 8 to introduce water, replenishing cleaning tank 8 and causing the wastewater level to rise and be discharged through overflow port 801.

[0047] In a preferred embodiment, such as Figure 2 As shown, the coagulation tank 2 is also equipped with a stirring mechanism 12. The stirring mechanism 12 includes a stirring shaft arranged vertically inside the coagulation tank 2. Multiple sets of stirring blades 1201 are evenly arranged along the circumference of the outer wall of the stirring shaft. One end of the stirring shaft is connected to a motor 1202 that drives its rotation. Specifically, the stirring mechanism 12 stirs the wastewater and flocculant in the coagulation tank 2, so that the wastewater and flocculant are fully mixed, thereby improving the coagulation effect.

[0048] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A steam thermal cracking furnace wastewater treatment mechanism, characterized by, The base plate includes a coagulation tank, a sedimentation tank, a clear water tank 1, a sand filter tower, a carbon filter tower, a softener, and a clear water tank 2, which are connected in sequence by liquid guide pipes. The coagulation tank is connected to a liquid inlet pipe, which is used to transport the wastewater generated after oil-water separation into the coagulation tank. The coagulation tank is connected to a flocculant dosing mechanism and a first pH adjustment mechanism. The flocculant dosing mechanism is used to add flocculant into the coagulation tank. After the flocculant is mixed with the wastewater, it enters the sedimentation tank for sedimentation. The first pH adjustment mechanism is used to increase the pH value of the wastewater, making the wastewater weakly alkaline. The clean water tank is connected to a second pH adjustment mechanism, which is used to lower the pH value of the wastewater. It also includes a controller, and the flocculant dosing mechanism, the first pH adjustment mechanism and the second pH adjustment mechanism are all electrically connected to the controller.

2. A steam pyrolysis furnace wastewater treatment mechanism according to claim 1, characterized in that, The flocculant dosing mechanism includes a flocculant storage tank, which is connected to the coagulation tank via a first dosing pipe. A first dosing pump is installed on the first dosing pipe, and the first dosing pump is electrically connected to the controller.

3. A steam pyrolysis furnace wastewater treatment mechanism according to claim 1, characterized in that, The first pH adjustment mechanism includes a first storage tank containing sodium hydroxide solution. The first storage tank is connected to the coagulation tank via a second dosing pipe. A second dosing pump is installed on the second dosing pipe and is electrically connected to the controller.

4. The steam pyrolysis furnace wastewater treatment mechanism according to claim 1, characterized in that, The second pH adjustment mechanism includes a second storage tank containing hydrochloric acid solution. The second storage tank is connected to the clean water tank via a third dosing pipe. A third dosing pump is installed on the third dosing pipe and is electrically connected to the controller.

5. A steam pyrolysis furnace wastewater treatment mechanism according to claim 4, characterized in that, The first clear water tank has an overflow port at the upper end of its side wall, and the second clear water tank has an overflow port at the upper end of its side wall. The first overflow port is connected to the sand filter tower through a liquid guide pipe. A liquid level sensor is installed on the inner wall of the first clear water tank above the first overflow port, and a liquid level sensor is installed on the inner wall of the second clear water tank above the second overflow port. Both the first liquid level sensor and the second liquid level sensor are electrically connected to the controller.

6. A steam pyrolysis furnace wastewater treatment mechanism according to claim 5, characterized in that, Both the first and second clean water tanks are connected to inlet pipes, and valves are installed on the inlet pipes. The valves are electrically connected to the controller and are used to deliver clean water into the first or second clean water tank.

7. A steam pyrolysis furnace wastewater treatment mechanism according to claim 1, characterized in that, The coagulation tank is also equipped with a stirring mechanism, which includes a stirring shaft arranged vertically inside the coagulation tank. Multiple sets of stirring blades are evenly arranged on the outer wall of the stirring shaft along its circumference. One end of the stirring shaft is connected to a motor that drives its rotation.

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