Oil gas condensing treatment device after oil-rich coal pyrolysis

Abstract

A kind of oil-rich coal pyrolysis oil gas condensation treatment device after, including high-temperature pyrolysis furnace, it is characterized by further comprising: spray tower, the oil gas inlet of the spray tower is connected with the oil gas outlet of high-temperature pyrolysis furnace by oil gas pipeline, the spray tower is used to receive the oil gas mixture generated by high-temperature pyrolysis furnace and spray to the high-temperature oil gas, to form oil-water mixture;By spraying high-concentration sodium hydroxide solution in spray tower as spray medium, it is evenly sprayed in oil gas mixture, due to sodium hydroxide solution and sulfur-containing acidic substance in oil gas neutralization, effectively reduce the emission of acid gas.And the strong alkaline and higher operating temperature of sodium hydroxide solution make the evaporation rate of the sodium hydroxide solution low, help to form stable spray curtain, improve the contact efficiency of oil gas and spray liquid, enhance the trapping effect of oil gas, and sodium hydroxide solution can promote the coalescence of oil droplets, it is beneficial to subsequent oil-water separation.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, and in particular to a device for treating oil and gas condensation after pyrolysis of oil-rich coal. Background Technology

[0002] Oil-rich coal, as an important energy resource, can generate large amounts of oil and gas during high-temperature anaerobic pyrolysis. This oil and gas is not only rich in organic matter and can be used as chemical raw materials, but it also contains sulfur-containing acidic gases, dust, and other impurities. To effectively recover and utilize these oil and gas resources while reducing environmental pollution, oil and gas condensation treatment units are particularly important.

[0003] Currently, the technology for treating oil and gas condensation uses water spray washing, but this water spray method has the following problems:

[0004] (1) Difficulty in oil-water separation: When treating oil and gas from pyrolysis of oil-rich coal using traditional water spraying methods, the high organic matter content in the oil and gas leads to the formation of a stable emulsion system, making oil-water separation extremely difficult. The stability of the emulsion system means that a large amount of energy is required during the separation process, increasing the processing cost.

[0005] (2) The treatment of sulfur-containing acidic substances is not up to standard:

[0006] The oil and gas from the pyrolysis of oil-rich coal contain a certain amount of sulfur-containing acidic gases. These gases dissolve in the water during the water spraying process, forming acidic wastewater. However, water spraying cannot effectively neutralize the acidic substances in the wastewater, resulting in the treated wastewater having a pH value that does not meet the standards, thus burdening subsequent wastewater treatment processes.

[0007] (3) Wastewater with extremely high oil concentration is difficult to purify:

[0008] Due to the difficulty of separating oil and water, wastewater treated by traditional water spraying methods often contains a high concentration of oil. High-oil-content wastewater is not only difficult to purify, but may also cause serious pollution to the aquatic environment. Utility Model Content

[0009] The purpose of this invention is to provide an oil and gas condensation treatment device after the pyrolysis of oil-rich coal. It utilizes the waste heat flue gas generated by the pyrolysis furnace to heat the sprayed mixture, increasing its temperature and chemical reaction rate. Furthermore, it fully utilizes the waste heat generated during pyrolysis for recycling, achieving energy conservation and environmental protection. After the heated mixture enters the stratification tank, due to the density difference between the two components, they will naturally separate under gravity. The boiling point of the sodium hydroxide solution is above 100℃, further improving the efficiency of oil-water stratification. By coagulating the oily wastewater in the coagulation sedimentation tank, residual oil and dust can be effectively removed. The resulting sludge and supernatant, after purification, can meet emission standards or reuse requirements, avoiding ecological pollution.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A device for condensing oil and gas after pyrolysis of oil-rich coal, comprising a high-temperature pyrolysis furnace, characterized in that it further comprises:

[0012] A spray tower is provided with an oil and gas inlet, which is connected to the oil and gas outlet of a high-temperature pyrolysis furnace through an oil and gas pipeline. The spray tower is used to receive the oil and gas mixture generated by the high-temperature pyrolysis furnace and spray the high-temperature oil and gas mixture to form an oil-water mixture.

[0013] The waste heat exchanger is provided with a flue gas inlet, which is connected to the flue gas outlet of the high-temperature pyrolysis furnace through a flue gas pipe. The waste heat exchanger is also connected to the bottom of the spray tower through a spray tower mixed liquid outlet pipe. The waste heat exchanger is used to receive the high-temperature flue gas generated by the high-temperature pyrolysis furnace and to use the high-temperature flue gas to exchange heat with the oil-water mixture entering the waste heat exchanger, thereby raising the temperature of the oil-water mixture.

[0014] A stratification tank, which is connected to the waste heat exchanger via an oil-water mixture inlet pipe, is used to receive a high-temperature oil-water mixture and separate out oil and oily wastewater.

[0015] A coagulation sedimentation tank, which is connected to the stratification tank via a coagulation sedimentation tank inlet pipe, is used to receive oily wastewater and separate clean water from the oily wastewater;

[0016] A solution preparation tank, which is connected to the coagulation and sedimentation tank via a coagulation and sedimentation tank outlet pipe, is used to receive clean water to prepare sodium hydroxide solution;

[0017] A cooling heat exchanger is provided, the inlet of which is connected to the liquid preparation tank via the liquid preparation tank outlet pipe. The cooling heat exchanger is used to reduce the temperature of the sodium hydroxide solution. The outlet of the cooling heat exchanger is connected to the spray tower via the cooling heat exchanger outlet pipe.

[0018] Furthermore, the stratification tank is equipped with an oil phase outlet, which is connected to an oil pump via an oil pipeline for outputting the separated oil products.

[0019] Furthermore, a water pump is also installed on the inlet pipe of the coagulation sedimentation tank between the stratification tank and the coagulation sedimentation tank.

[0020] Furthermore, an alkali pump is installed on the outlet pipe of the liquid preparation tank between the liquid preparation tank and the cooling heat exchanger.

[0021] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0022] 1. By spraying a high-concentration sodium hydroxide solution into the spray tower as the spraying medium, it is evenly sprayed into the oil-gas mixture. Since the sodium hydroxide solution neutralizes the sulfuric acid-containing substances in the oil and gas, the emission of acidic gases is effectively reduced. Furthermore, the strong alkalinity and high operating temperature of the sodium hydroxide solution result in a low evaporation rate, which helps to form a stable spray curtain, improves the contact efficiency between oil and gas and the spray liquid, enhances the oil and gas capture effect, and promotes the aggregation of oil droplets, which is beneficial for subsequent oil-water separation.

[0023] 2. The waste heat flue gas generated by the pyrolysis furnace is used to heat the sprayed mixture, which increases the temperature of the mixture, increases the chemical reaction rate, and makes full use of the waste heat in the pyrolysis process for recycling, thus achieving energy saving and environmental protection.

[0024] 3. After the heated mixture enters the separation tank, it will naturally separate into layers under the action of gravity due to the density difference between the two. Furthermore, since the boiling point of the sodium hydroxide solution is higher than 100℃, the efficiency of oil-water separation is improved.

[0025] 4. By coagulating oily wastewater in a coagulation sedimentation tank, residual oil and dust in the wastewater can be effectively removed. The sludge and supernatant formed after coagulation can be purified to meet discharge standards or reuse requirements, thus avoiding ecological pollution. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of an oil-rich coal pyrolysis post-oil gas condensation treatment device according to an embodiment of the present invention is shown.

[0027] The attached diagram is labeled as follows: 1. High-temperature pyrolysis furnace; 2. Waste heat exchanger; 3. Spray tower; 4. Layered tank; 5. Water pump; 6. Oil pump; 7. Coagulation sedimentation tank; 8. Liquid mixing tank; 9. Cooling heat exchanger; 10. Flue gas outlet; 11. Oil and gas pipeline; 12. Flue gas pipeline; 13. Mixed liquid outlet pipeline from spray tower; 14. Oil-water mixture inlet pipeline; 15. Coagulation sedimentation tank inlet pipeline; 16. Coagulation sedimentation tank outlet pipeline; 17. Liquid mixing tank outlet pipeline; 18. Oil pipeline; 19. Cooling heat exchanger outlet pipeline; 20. Alkali pump; 21. Oil and gas outlet; 22. Nozzle. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of the oil and gas condensation treatment device after pyrolysis of oil-rich coal, in conjunction with the accompanying drawings and specific embodiments, will further illustrate the present utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, used only to facilitate and clearly illustrate the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0029] Please refer to Figure 1 This utility model provides an oil and gas condensation treatment device after the pyrolysis of oil-rich coal, comprising:

[0030] A device for condensing oil and gas after pyrolysis of oil-rich coal, comprising a high-temperature pyrolysis furnace 1, characterized in that: it further comprises:

[0031] The spray tower 3 is provided with an oil and gas inlet, which is connected to the oil and gas outlet 21 of the high-temperature pyrolysis furnace 1 through an oil and gas pipeline 11. The spray tower 3 is used to receive the oil and gas mixture generated by the high-temperature pyrolysis furnace and spray the high-temperature oil and gas mixture to form an oil-water mixture.

[0032] Waste heat exchanger 2 is provided with a flue gas inlet, which is connected to the flue gas outlet 10 of the high-temperature pyrolysis furnace 1 through a flue gas pipe 12; the waste heat exchanger 2 is connected to the bottom of the spray tower 3 through a spray tower mixed liquid outlet pipe 13. The waste heat exchanger 2 is used to receive the high-temperature flue gas generated by the high-temperature pyrolysis furnace and to use the high-temperature flue gas to exchange heat with the oil-water mixture entering the waste heat exchanger 2, thereby raising the temperature of the oil-water mixture;

[0033] The stratification tank 4 is connected to the waste heat exchanger 2 via an oil-water mixture inlet pipe 14, and is used to receive high-temperature oil-water mixture and separate out oil and oily wastewater.

[0034] A coagulation sedimentation tank 7 is connected to the stratification tank 4 via a coagulation sedimentation tank inlet pipe 15, and is used to receive oily wastewater and separate clean water from the oily wastewater;

[0035] The solution preparation tank 8 is connected to the coagulation sedimentation tank 7 via the coagulation sedimentation tank outlet pipe 16, and is used to receive clean water to prepare sodium hydroxide solution.

[0036] Cooling heat exchanger 9, the inlet of which is connected to the liquid preparation tank 8 through the liquid preparation tank outlet pipe 17, the cooling heat exchanger 9 is used to reduce the temperature of sodium hydroxide solution, and the outlet of the cooling heat exchanger 9 is connected to the spray tower 3 through the cooling heat exchanger outlet pipe 19.

[0037] Furthermore, the stratification tank 4 is provided with an oil phase outlet, which is connected to the oil pump 6 via an oil pipeline 18 for outputting the separated oil products.

[0038] Furthermore, a water pump 5 is also installed on the inlet pipe 15 of the coagulation sedimentation tank between the stratification tank 4 and the coagulation sedimentation tank 7.

[0039] Furthermore, an alkali pump 20 is also installed on the liquid distribution tank outlet pipe 17 between the liquid distribution tank 8 and the cooling heat exchanger 9.

[0040] The spray tower 3 and the high-temperature pyrolysis furnace 1 transmit an oil-gas mixture into the spray tower 3 through the oil-gas pipeline 11. The nozzles 22 inside the spray tower 3 use a pre-prepared high-concentration sodium hydroxide solution as the spraying medium to uniformly spray the oil-gas mixture. The sodium hydroxide solution neutralizes the sulfuric acid-containing substances in the oil-gas, effectively reducing the emission of acidic gases. Furthermore, the strong alkalinity and high operating temperature of the sodium hydroxide solution result in a low evaporation rate, which helps to form a stable spray curtain, improves the contact efficiency between the oil-gas and the spray liquid, enhances the oil-gas capture effect, and promotes the aggregation of oil droplets, which is beneficial for subsequent oil-water separation. At the same time, the non-condensable gases generated by the spraying are discharged from the top of the spray tower 3.

[0041] For further information, please refer to the following: Figure 1 It also includes a waste heat exchanger 2, which has a flue gas inlet and is connected to the flue gas outlet 10 of the high-temperature pyrolysis furnace 1 via a flue gas pipe 12 for introducing high-temperature flue gas into the waste heat exchanger 2. The waste heat exchanger 2 also has a mixed liquid inlet and is connected to the spray tower 3 via a mixed liquid outlet pipe 13. The mixed liquid enters the waste heat exchanger 2 through the mixed liquid outlet pipe 13 and exchanges heat with the high-temperature waste heat flue gas generated by the high-temperature pyrolysis furnace 1, ensuring that the mixed liquid can fully absorb the heat of the waste heat flue gas, thereby increasing the temperature of the mixed liquid. By increasing the temperature of the mixed liquid, it helps to increase the chemical reaction rate of the mixed liquid, which is convenient for subsequent separation and processing.

[0042] For further information, please refer to the following: Figure 1 It also includes a stratification tank 4. The oil-water mixture inlet of the stratification tank 4 is connected to the outlet of the waste heat exchanger 2 through an oil-water mixture inlet pipe 14. The mixture after being heated enters the stratification tank 4 through the oil-water mixture inlet pipe 14. Due to the density difference between oil and water, they naturally separate into layers under the action of gravity. The upper layer of the stratification tank 4 is the oil phase, and the lower layer is the water phase. Since the boiling point of sodium hydroxide solution is higher than 100℃, the efficiency of oil-water separation is effectively improved.

[0043] For further information, please refer to the following: Figure 1 It also includes a coagulation sedimentation tank 7, which is connected to the water phase outlet of the stratification tank 4 via a coagulation sedimentation tank inlet pipe 15. The coagulation sedimentation tank 7 is used to receive oily wastewater and separate clean water from the oily wastewater. Specifically, a water pump 5 is also installed on the coagulation sedimentation tank inlet pipe 15, which is used to transport wastewater.

[0044] Furthermore, the aforementioned layered tank 4 also has an oil phase outlet, which is connected to the oil pump 6 via an oil pipeline 18, and the oil is output by the oil pump 6.

[0045] Furthermore, an appropriate amount of coagulant, such as aluminum chloride or iron salt, is added to the coagulation sedimentation tank 7 to cause suspended solids and colloidal substances in the oily wastewater to aggregate into larger particles. Coagulation removes residual substances and dust from the wastewater, thereby improving the clarity of the wastewater. The coagulated wastewater settles in the coagulation sedimentation tank 7 and remains there for a sufficient time, allowing the particulate matter to fall to the bottom of the sedimentation tank under gravity to form sludge. The supernatant is then used as effluent to form clear water, which enters the lower distribution tank 8.

[0046] Please continue to refer to this. Figure 1The outlet of the coagulation sedimentation tank 7 is also connected to a solution preparation tank 8 via a coagulation sedimentation tank outlet pipe 16. The solution preparation tank 8 is used to receive clean water and prepare sodium hydroxide solution. The outlet of the solution preparation tank 8 is connected to the inlet of the alkali pump 20 via a solution preparation tank outlet pipe 17. The outlet of the alkali pump 20 is connected to the inlet of the cooling heat exchanger 9 via the solution preparation tank outlet pipe 17. The alkali pump 20 outputs the prepared high-concentration sodium hydroxide solution to the cooling heat exchanger 9, where the sodium hydroxide solution is circulated and heat exchanged with the cooling water. Then, it is sent to the spray tower 3 through the cooling heat exchanger outlet pipe 19 and sprayed out from the nozzle 22.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for condensing oil and gas after pyrolysis of oil-rich coal, comprising a high-temperature pyrolysis furnace (1), characterized in that: Also includes: The spray tower (3) is provided with an oil and gas inlet, which is connected to the oil and gas outlet (21) of the high-temperature pyrolysis furnace (1) through an oil and gas pipeline (11). Waste heat exchanger (2), the waste heat exchanger (2) is provided with a flue gas inlet, the flue gas inlet is connected to the flue gas outlet (10) of the high temperature pyrolysis furnace (1) through a flue gas pipe (12); the waste heat exchanger (2) is connected to the bottom of the spray tower (3) through a spray tower mixed liquid pipe (13). A stratified tank (4) is connected to the waste heat exchanger (2) via an oil-water mixture inlet pipe (14). A coagulation sedimentation tank (7) is connected to the stratification tank (4) via a coagulation sedimentation tank inlet pipe (15). A liquid preparation tank (8) is connected to the coagulation sedimentation tank (7) via a coagulation sedimentation tank outlet pipe (16). The inlet of the cooling heat exchanger (9) is connected to the liquid distribution tank (8) through the liquid distribution tank outlet pipe (17), and the outlet of the cooling heat exchanger (9) is connected to the spray tower (3) through the cooling heat exchanger outlet pipe (19).

2. The oil and gas condensation treatment device after oil-rich coal pyrolysis as described in claim 1, characterized in that: The layered tank (4) is provided with an oil phase outlet, which is connected to the oil pump (6) through an oil pipeline (18).

3. The oil and gas condensation treatment device after oil-rich coal pyrolysis as described in claim 1, characterized in that: A water pump (5) is also installed on the inlet pipe (15) of the coagulation sedimentation tank between the stratification tank (4) and the coagulation sedimentation tank (7).

4. The oil and gas condensation treatment device after oil-rich coal pyrolysis as described in claim 1, characterized in that: An alkali pump (20) is also installed on the outlet pipe (17) of the liquid preparation tank (8) between the liquid preparation tank (8) and the cooling heat exchanger (9).

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