Supercritical Water Oxidation Slag Discharge System for Radioactive Organic Waste

Abstract

The present invention relates to the technical field of supercritical water oxidation reaction equipment, specifically a supercritical water oxidation slag discharge system for radioactive organic waste, which includes a supercritical water oxidizer, a slag discharge valve pipe II for discharging solid-liquid waste, and a slag discharge valve pipe I for discharging gas waste; it further includes: an interconnection pipe, horizontally and threadedly installed at one end of the slag discharge valve pipe I, and an air extraction connection port is formed on the top wall of the upper shell; a refrigeration sheet, arranged inside the interconnection pipe below the air extraction connection port, for condensing the flowing hot gas; a sponge, closely arranged inside the interconnection pipe between the scraping ring and the air extraction connection port, for adsorbing the hot gas waste flowing through the interconnection pipe to the air extraction connection port. Through the setting of the above structure, the sponge in the present invention can adsorb and dry the flowing hot steam, so that the salted water vapor is absorbed by the sponge, and the relatively dry gas waste is discharged and treated through the air extraction connection port, reducing the salted hot steam being transported to the gas treatment equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of supercritical water oxidation reaction equipment, and specifically to a supercritical water oxidation slag discharge system for radioactive organic waste. Background Art

[0002] Supercritical water is an excellent solvent for radioactive organic waste and oxygen. By heating and pressurizing the organic fluid in vapor-liquid equilibrium, the organic waste is oxidized into harmless small molecule compounds such as carbon dioxide, water, nitrogen, and salts at an appropriate temperature, pressure, and a certain retention time. After the reaction is completed, the organic waste will form solid-liquid-gas waste, which will be pumped away for further treatment.

[0003] During the formation of salt waste, due to the high temperature and high pressure inside the equipment, some salts will evaporate and saltify in the water vapor as the liquid evaporates, forming a hot gas stream. When the hot gas stream waste is directly pumped into the gas treatment equipment without treatment, the water vapor containing salts will form salt crystals during the treatment and be retained and fall off into the equipment, affecting the use, clogging, and damage of the equipment. Moreover, the hot water vapor will adhere to the inner wall of the conveying pipe during the conveying process, and the salt-containing steam on the inner wall of the pipe will cause the pipe wall to stick and clog after drying. Summary of the Invention

[0004] The purpose of the present invention is to provide a supercritical water oxidation slag discharge system for radioactive organic waste to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A supercritical water oxidation slag discharge system for radioactive organic waste, including a supercritical water oxidizer, a slag discharge valve pipe two for discharging solid-liquid waste, and a slag discharge valve pipe one for discharging gas waste; further including: an interconnection pipe, horizontally and threadedly installed at one end of the slag discharge valve pipe one, the interconnection pipe includes a detachable upper shell and a lower shell, a ventilation connection port is formed on the top wall of the upper shell, and the ventilation connection port penetrates through the wall thickness of the interconnection pipe;

[0006] A Peltier element, arranged inside the interconnection pipe below the ventilation connection port, for condensing the flowing hot gas stream.

[0007] A sponge, fittingly arranged inside the interconnection pipe between the scraping ring and the ventilation connection port, for adsorbing the hot gas stream waste flowing through the interconnection pipe to the ventilation connection port.

[0008] A scraping ring, arranged inside the interconnection pipe, the scraping ring fits the inner wall of the interconnection pipe and reciprocates along the pipe length direction of the interconnection pipe, for scraping the slag adhered to the inner wall of the interconnection pipe.

[0009] Preferably, a first metal sheet is attached to the outer wall of one side of the Peltier element adjacent to the scraping ring, and a second metal sheet is attached to the outer wall of the other side. The first metal sheet and the second metal sheet are in fit with the inner diameter of the interconnection pipe.

[0010] Preferably, a motor is installed at one end of the interconnection pipe away from the first slag discharge valve pipe. The output end of the motor is sleeved with a hollow drive rod that passes through the second metal sheet, the first metal sheet, and the sponge. A water vapor flow channel is formed between the first slag discharge valve pipe, the central through hole of the first metal sheet, and the air extraction connection port; a double-threaded groove is formed on the outer wall of the hollow drive rod between the air extraction connection port and the first slag discharge valve pipe. A slider that cooperates with the double-threaded groove is sleeved on the hollow drive rod. The scraping ring is installed on the outer wall of the slider through a plate. A limiting scraping block is vertically installed at the bottom end of the scraping ring. A chute is formed through the wall thickness at the bottom end of the interconnection pipe from the first metal sheet to the first slag discharge valve pipe, and the limiting scraping block slides and is stuck in the chute.

[0011] Preferably, the outer wall of the hollow drive rod is in fit with the inside of the sponge. The sponge is located on the moving path of the scraping ring, and the two form an extrusion fit.

[0012] Preferably, a long groove is provided on the outer wall of the hollow drive rod on the side of the second metal sheet away from the Peltier element. The long groove runs through the wall thickness of the hollow drive rod; circular holes are evenly distributed on the outer wall of the hollow drive rod between the first metal sheet and the first slag discharge valve pipe. The circular holes are located outside the double-threaded groove and run through the wall thickness direction of the hollow drive rod; multiple groups of circular holes are arranged radially along the hollow drive rod inside the sponge.

[0013] Preferably, a baffle that fits the inner wall of the interconnection pipe is slidably sleeved on the surface of the hollow drive rod on one side of the long groove. A heat storage area is formed between the baffle and the second metal sheet.

[0014] Preferably, a spring strut that passes through the second metal sheet, the first metal sheet, and the sponge is installed parallel to the outer wall of the baffle. The spring strut is used to limit and support the sponge; one end of the spring strut is located on the moving path of the scraping ring.

[0015] Preferably, a liquid collection box corresponding to the chute is installed at the bottom end of the interconnection pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By setting the scraping ring in the present invention, the reciprocating movement of the scraping ring can continuously scrape off the salted water droplets adhering to the inner wall of the interconnection pipe, avoiding the formation of solid adhesions on the inner wall of the interconnection pipe after long-term use, and reducing the blockage of the pipeline and gas treatment equipment caused by solid adhesions.

[0018] 2. By setting the sponge in the present invention, the flowing hot steam can be adsorbed and dried, so that the salted water vapor is absorbed by the sponge, and the relatively dry gas waste is discharged through the air extraction connection port for treatment, reducing the transportation of salted hot steam to the gas treatment equipment.

[0019] 3. By providing a Peltier cooler and using it in conjunction with the first metal sheet, the hot gas flowing through the first metal sheet can be condensed into water droplets, further drying the gas and reducing the discharge of salinized water vapor from the exhaust connection port. Moreover, the squeezing contact between the scraping ring, the sponge, and the first metal sheet can squeeze the saturated liquid inside the sponge. At the same time, the sponge can reduce the water droplets on the surface of the first metal sheet and prevent the formation of a water droplet film layer on the surface of the first metal sheet, improving the contact between the first metal sheet and the hot steam and further enhancing the condensation and collection efficiency of the water droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is an enlarged schematic diagram of the communication pipe of the present invention;

[0022] Figure 3 is a schematic diagram of the internal structure of the communication pipe of the present invention;

[0023] Figure 4 is a schematic cross-sectional structure diagram of the sponge of the present invention;

[0024] Figure 5 is a schematic bottom view structure diagram of the communication pipe of the present invention;

[0025] Figure 6 is a schematic diagram of the movement state of the scraping ring of the present invention;

[0026] Figure 7 is a schematic side view structure diagram of the first metal sheet of the present invention.

[0027] In the figure: 1. Supercritical water oxidizer; 101. First slag discharge valve pipe; 102. Second slag discharge valve pipe;

[0028] 2. Communication pipe; 201. Exhaust connection port; 202. Slide groove;

[0029] 3. Scraping ring; 301. Slide block; 302. Limiting scraping block; 303. Hollow drive rod; 304. Motor;

[0030] 4. Sponge;

[0031] 5. Peltier cooler; 501. First metal sheet; 502. Second metal sheet;

[0032] 6. Baffle; 601. Spring strut; 602. Long groove; 6021. Round hole. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] Embodiment:

[0037] As Figures 1 to 7 shown, the present embodiment provides a supercritical water oxidation slag discharge system for radioactive organic waste, which includes a supercritical water oxidizer 1, a slag discharge valve pipe two 102 for discharging solid and liquid waste, and a slag discharge valve pipe one 101 for discharging gas waste; the supercritical water oxidizer 1 is a prior art, and reference can be made to the authorized announcement number: CN208292727U, which will not be elaborated here; it further includes an interconnection pipe 2, which is horizontally threadedly installed at one end of the slag discharge valve pipe one 101, and a gasket is also provided between the connection of the two. The interconnection pipe 2 includes an upper shell and a lower shell that can be connected by bolts and are detachable. A gasket is attached between the upper and lower objects to ensure the sealing between the two shells. An air extraction connection port 201 is formed on the top wall of the upper shell, and the air extraction connection port 201 penetrates along the wall thickness of the interconnection pipe 2. The air extraction connection port 201 is communicated with an external gas treatment device;

[0038] As Figure 3As shown, one end of the interconnection pipe 2 away from the slag discharge valve pipe 101 is installed with a motor 304. The motor 304 is connected and started through external electric control components. The output end of the motor 304 is sleeved with a hollow transmission rod 303 that passes through the metal sheet two 502, the metal sheet one 501, and the sponge 4. A water vapor flow channel is formed between the slag discharge valve pipe 101, the middle through hole of the metal sheet one 501, and the air extraction connection port 201; a double-threaded groove is formed on the outer wall of the hollow transmission rod 303 between the air extraction connection port 201 and the slag discharge valve pipe 101. A slider 301 that cooperates with the double-threaded groove is sleeved on the hollow transmission rod 303. The scraping ring 3 is installed on the outer wall of the slider 301 through a plate. A limiting scraping block 302 is vertically installed at the bottom end of the scraping ring 3. A chute 202 is formed through the wall along the thickness from the metal sheet one 501 to the bottom end of the interconnection pipe 2 of the slag discharge valve pipe 101. The limiting scraping block 302 slides and is stuck in the chute 202; that is, the rotation of the motor 304 drives the hollow transmission rod 303 to rotate synchronously. The hollow transmission rod 303 drives the scraping ring 3 with external thread cooperation to reciprocate along the double-threaded groove on the surface of the hollow transmission rod 303. The scraping ring 3 is arranged inside the interconnection pipe 2. The scraping ring 3 fits the inner wall of the interconnection pipe 2 and reciprocates along the pipe length direction of the interconnection pipe 2. A liquid collection box corresponding to the chute 202 is installed at the bottom end of the interconnection pipe 2. The reciprocating movement of the scraping ring 3 can reciprocally scrape and clean the inner wall of the interconnection pipe 2, which is used to scrape the slag adhered to the inner wall of the interconnection pipe 2, reduce the accumulation of hot steam water droplets on the inner wall, the problem of drying and crystallization, and the saltified water droplets removed can drip through the chute 202 and flow into the collection box for treatment together with the solid-liquid waste, such as Figure 5 As shown, it is to prevent saltified water vapor from entering the gas treatment equipment, achieve the separate treatment of solid-liquid-gas waste, and reduce environmental pollution.

[0039] such as Figure 3 and Figure 4As shown, the Peltier cooler 5 is arranged inside the interconnection pipe 2 below the air extraction connection port 201 and is used to condense the flowing hot gas. After the Peltier cooler 5 is powered on, the heat at the cold end is transferred to the hot end, resulting in a decrease in the temperature of the cold end and an increase in the temperature of the hot end. It has stable performance and is suitable for use in harsh environments such as high temperature, high cold, and humidity. The Peltier cooler 5 is a prior art and will not be elaborated here. On one outer wall of the Peltier cooler 5 adjacent to the scraping ring 3, there is a first metal sheet 501 attached, and on the other outer wall, there is a second metal sheet 502 attached. The first metal sheet 501 and the second metal sheet 502 fit the inner diameter of the interconnection pipe 2. The first metal sheet 501 is the cold end, and the second metal sheet 502 is the hot end. After the supercritical water oxidation reaction inside the supercritical water oxidizer 1, the gas inside the supercritical water oxidizer 1 can be discharged by opening the solenoid valve inside the slag discharge valve pipe 101. The hot steam inside the supercritical water oxidizer 1 will pass through the slag discharge valve pipe 101, the central through hole of the first metal sheet 501, and the air extraction connection port 201 and be discharged. Since the first metal sheet 501 is the cold end, the flowing hot air will contact the surface of the first metal sheet 501. After the hot and cold contact, the hot steam will condense into water droplets, so that the salted hot steam forms water droplets and slides down the outer wall of the first metal sheet 501 to the bottom of the interconnection pipe 2 and is discharged into the collection box through the chute 202 formed at the bottom of the interconnection pipe 2, as Figure 5 shown, and is treated together with the solid-liquid waste; by contacting the first metal sheet 501 with the salted hot steam, the humidity of the flowing air is reduced, and the entry of salt-containing water vapor into the gas treatment equipment is avoided, reducing the problem of salt drying and crystallization blockage in the gas treatment equipment.

[0040] As Figure 3 and Figure 4 shown, the sponge 4 is attached and arranged inside the interconnection pipe 2 between the scraping ring 3 and the air extraction connection port 201. When the sponge 4 needs to be replaced, only the interconnection pipe 2 and the fan blade threadedly connected to one end of the hollow transmission rod 303 need to be removed, and the new sponge 4 can be sleeved into one end of the hollow transmission rod 303; on the basis that the hot steam inside the supercritical water oxidizer 1 will pass through the slag discharge valve pipe 101, the central through hole of the first metal sheet 501, and the air extraction connection port 201 and be discharged, the hot steam will pass through the inside of the sponge 4. Physical dehumidification can be formed through the sponge 4 to reduce the discharge of the hot steam with higher humidity inside the interconnection pipe 2, and it is used to adsorb the hot gas waste flowing through the interconnection pipe 2 to the air extraction connection port 201. The hot gas waste mainly includes the salt compounds salted in the hot steam; a spring is also arranged between the sponge 4 and the first metal sheet 501, and a certain distance is formed between the sponge 4 and the first metal sheet 501 through the spring to improve the contact between the flowing gas and the surface of the first metal sheet 501; because the outer wall of the hollow transmission rod 303 fits the inside of the sponge 4 and the sponge 4 is located on the moving path of the scraping ring 3, the two form an extrusion fit, and can be as Figure 6As shown, while the scraping ring 3 reciprocates to clean the inner wall of the interconnection pipe 2, the scraping ring 3 can also squeeze the sponge 4, causing the sponge 4 to move towards the first metal sheet 501 and come into contact with it as the scraping ring 3 moves, making the sponge 4 fit on the outer wall of the first metal sheet 501, facilitating the extrusion of the water flow steam water droplets absorbed inside the sponge 4. The extruded liquid is discharged through the chute 202 into the collection box for treatment. When the scraping ring 3 pushes the sponge 4 into extrusion contact with the first metal sheet 501, it can also adsorb the condensed water droplets on the outer wall of the first metal sheet 501 through the sponge 4, reducing the formation of the water droplet film layer on the surface of the first metal sheet 501, enhancing the contact between the first metal sheet 501 and the heat flow steam, and further improving the condensation and collection efficiency of the water droplets.

[0041] As Figure 4 and Figure 7 shown, on the outer wall of the hollow drive rod 303 on one side of the second metal sheet 502 away from the refrigeration sheet 5, there is a long groove 602 that runs through the wall thickness of the hollow drive rod 303; the second metal sheet 502 is connected to the hot end of the refrigeration sheet 5, the second metal sheet 502 fits on the inner wall of the interconnection pipe 2 and forms a nearly closed interval with the inner wall of the other end of the interconnection pipe 2. Also, because the long groove 602 is on one side of the second metal sheet 502, the heat generated by the second metal sheet 502 can enter the interior of the hollow drive rod 303 through the long groove 602. Circular holes 6021 are evenly distributed on the outer wall of the hollow drive rod 303 between the first metal sheet 501 and the first slag discharge valve pipe 101. The circular holes 6021 are located outside the double-threaded groove and run through the wall thickness direction of the hollow drive rod 303; multiple groups of circular holes 6021 are arranged radially along the hollow drive rod 303 inside the sponge 4. Therefore, the hot air entering the interior of the hollow drive rod 303 can dry the sponge 4 sleeved outside the hollow drive rod 303, further enhancing the dehumidification of the sponge 4 for the heat flow gas flowing through the interior of the interconnection pipe 2 and removing the water droplet film layer on the surface of the first metal sheet 501, improving the drying of the sponge 4 and the first metal sheet 501 for the heat flow gas, reducing the entry of salt vapor into the air treatment equipment, and reducing the blockage of the equipment.

[0042] As Figure 4 and Figure 7 shown, a baffle 6 that fits on the inner wall of the interconnection pipe 2 is slidably sleeved on the surface of the hollow drive rod 303 on one side of the long groove 602. A heat storage interval is formed between the baffle 6 and the second metal sheet 502. The interval formed among the baffle 6, the second metal sheet 502, and the inner wall of the interconnection pipe 2 can accelerate the entry of the heat dissipated by the second metal sheet 502 from the long groove 602 into the interior of the hollow drive rod 303, improving the utilization rate of the heat.

[0043] As Figure 7 and Figure 6As shown in the figure, a spring strut 601 that traverses the second metal sheet 502, the first metal sheet 501, and the sponge 4 is installed parallel to the outer wall of the baffle 6. The spring strut 601 is used to limit and support the sponge 4. One end of the spring strut 601 is located on the moving path of the scraping ring 3. The spring strut 601 can support the sponge 4 so that it can fit against the inner wall of the interconnection pipe 2 and be well accommodated inside the interconnection pipe 2, improving the drying effect of the sponge 4 on the hot steam flowing through the inside of the interconnection pipe 2. One end of the spring strut 601 can also come into contact with the scraping ring 3 when the scraping ring 3 moves. The scraping ring 3 pushes the spring strut 601 and the baffle 6 to move to one side. When the spring strut 601 and the baffle 6 lose the extrusion of the scraping ring 3, they can also be reset through the spring on the surface of the spring strut 601, so that the baffle 6 forms a reciprocating movement effect. The reciprocating movement of the baffle 6 can accelerate the heat dissipated by the second metal sheet 502 to enter through the long groove 602, accelerate the heat transfer to the position of the sponge 4, and dry the sponge 4. While reducing heat waste, it can also improve the drying effect of the sponge 4 and further improve the drying and adsorption effect of the sponge 4.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A supercritical water oxidation slag discharging system for radioactive organic waste, comprising a supercritical water oxidizer (1), a second slag discharging valve pipe (102) for discharging solid-liquid waste, and a first slag discharging valve pipe (101) for discharging gas waste; It is characterized in that, It further comprises: An intercommunication pipe (2), which is horizontally threadedly installed at one end of the first slag discharging valve pipe (101). The intercommunication pipe (2) comprises a detachable upper shell and a lower shell. An air extraction connection port (201) is formed on the top wall of the upper shell, and the air extraction connection port (201) penetrates through the wall thickness of the intercommunication pipe (2); A Peltier element (5), which is arranged inside the intercommunication pipe (2) below the air extraction connection port (201) and is used for condensing the flowing hot gas; A sponge (4), which is fitted inside the intercommunication pipe (2) between the scraping ring (3) and the air extraction connection port (201) and is used for adsorbing the hot gas waste flowing to the air extraction connection port (201) through the intercommunication pipe (2); A scraping ring (3), which is arranged inside the intercommunication pipe (2). The scraping ring (3) fits the inner wall of the intercommunication pipe (2) and reciprocates along the pipe length direction of the intercommunication pipe (2) for scraping the slag adhered to the inner wall of the intercommunication pipe (2); One outer wall of the Peltier element (5) adjacent to the scraping ring (3) is fitted with a first metal sheet (501), and the other outer wall is fitted with a second metal sheet (502). The first metal sheet (501) and the second metal sheet (502) fit the inner diameter of the intercommunication pipe (2); One end of the intercommunication pipe (2) far from the first slag discharging valve pipe (101) is installed with a motor (304). The output end of the motor (304) is sleeved with a hollow transmission rod (303) that passes through the second metal sheet (502), the first metal sheet (501), and the sponge (4). A water vapor flow channel is formed between the first slag discharging valve pipe (101), the middle through hole of the first metal sheet (501), and the air extraction connection port (201); A bidirectional thread groove is formed on the outer wall of the hollow transmission rod (303) between the air extraction connection port (201) and the first slag discharging valve pipe (101). A slider (301) that cooperates with the bidirectional thread groove is sleeved on the hollow transmission rod (303). The scraping ring (3) is installed on the outer wall of the slider (301) through a plate. A limiting scraping block (302) is vertically installed at the bottom end of the scraping ring (3). A sliding groove (202) is formed through the wall thickness at the bottom end of the intercommunication pipe (2) from the first metal sheet (501) to the first slag discharging valve pipe (101), and the limiting scraping block (302) slides and is stuck in the sliding groove (202); The outer wall of the hollow transmission rod (303) fits the inside of the sponge (4). The sponge (4) is located on the moving path of the scraping ring (3), and the two form an extrusion fit; On one side of the second metal sheet (502) away from the thermoelectric cooler (5), a long groove (602) is provided on the outer wall of the hollow drive rod (303), and the long groove (602) penetrates along the wall thickness of the hollow drive rod (303); circular holes (6021) are evenly distributed on the outer wall of the hollow drive rod (303) between the first metal sheet (501) and the first slag discharge valve pipe (101), the circular holes (6021) are located outside the double-threaded groove and penetrate along the wall thickness direction of the hollow drive rod (303); multiple groups of circular holes (6021) located inside the sponge (4) are arranged radially along the hollow drive rod (303).

2. The supercritical water oxidation slag discharge system for radioactive organic waste according to claim 1, characterized in that: A baffle (6) that fits the inner wall of the interconnection pipe (2) is slidably sleeved on the surface of the hollow drive rod (303) on one side of the long groove (602), and a heat storage interval is formed between the baffle (6) and the second metal sheet (502).

3. The supercritical water oxidation slag discharge system for radioactive organic waste according to claim 2, characterized in that: A spring strut (601) that transversely penetrates the second metal sheet (502), the first metal sheet (501), and the sponge (4) is parallelly installed on the outer wall of the baffle (6), and the spring strut (601) is used to limit and support the sponge (4); one end of the spring strut (601) is located on the moving path of the scraping ring (3).

4. The supercritical water oxidation slag discharge system for radioactive organic waste according to claim 3, characterized in that: A liquid collection box corresponding to the chute (202) is installed at the bottom end of the interconnection pipe (2).

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