Cadmium solution vacuum evaporation circulating cooling impregnation feeding device

Abstract

The application discloses a kind of cadmium liquid vacuum volatilization circulating cooling impregnation feeding devices, including molten pool type gasification furnace, molten iron liquid is loaded in molten pool type gasification furnace, annular apron is equipped on molten pool type gasification furnace, the lower end of annular apron extends into molten iron liquid, the upper end of annular apron is equipped with main jet oxygen lance, the annular area between the radial inner side surface of annular apron and radial outer side surface is equipped with cooling cavity, double-sided microporous liquid cadmium passage is equipped in cooling cavity, the upper end of microporous liquid cadmium passage is stretched out in cooling cavity and is equipped with liquid cadmium inlet, and liquid cadmium micropore is equipped on double-sided microporous liquid cadmium passage;The upper end of cooling cavity is equipped with gaseous cadmium outlet, and cooling backflow system is equipped between liquid cadmium inlet and gaseous cadmium outlet.In the application, metal cadmium is used as circulating coolant to cool annular apron, and explosion accidents caused by cooling water leakage are avoided.

Description

Technical Field

[0001] This invention relates to the field of energy technology, and in particular to a cadmium liquid vacuum evaporation circulating cooling impregnation feeding device. Background Technology

[0002] In the energy utilization of organic solid waste and biomass waste, molten iron bath gasification is a more advanced process for converting hazardous waste into low-carbon energy compared to traditional methods. Molten iron bath gasification involves high-speed injection of organic solid waste particles into molten iron, along with the introduction of a gasifying agent such as pure oxygen, for thorough treatment and conversion. This process transforms hydrocarbon elements into clean synthesis gas (carbon monoxide and hydrogen), which can be used as fuel gas or in chemical synthesis, such as methanation to produce natural gas and Fischer-Tropsch synthesis to produce gasoline and diesel. Most of the inorganic matter remains in the slag floating on the surface, achieving reduction, harmlessness, and resource recovery.

[0003] Using a molten iron gasifier to treat organic solid waste and generate syngas or further produce hydrogen is an emerging energy technology. This involves pre-filling the gasifier with molten iron, then feeding the organic solid waste into the molten iron through various methods while simultaneously introducing oxygen. The organic solid waste pyrolysis-gasification process is completed rapidly in a liquid environment above 1500 degrees Celsius. This high-temperature, rapid pyrolysis-gasification process does not produce dioxins; heavy metals and their oxides (which are reduced) either enter the molten iron or sink to the lower layer for recovery. The entire organic solid waste treatment process only requires the introduction of oxygen (the incomplete combustion of carbon and oxygen is an exothermic reaction), eliminating the need for additional reheating. This low-cost, low-carbon emission method produces hydrogen-rich energy.

[0004] Traditional molten pool gasifiers are equipped with oxygen lances, through which organic solid waste and oxygen are introduced into the gasifier. However, because the nozzle temperature of the oxygen lance is very high, typically around 1500-1600 degrees Celsius, cooling is required to ensure its proper operation. Traditional cooling methods involve circulating cooling water. If the cooling water leaks, its contact with the high-temperature molten iron will instantly generate a large amount of water vapor. Furthermore, the molten iron reacts chemically with the water to produce hydrogen gas, resulting in a rapid and violent expansion that could lead to an explosion. Therefore, traditional cooling methods pose significant safety hazards. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cadmium liquid vacuum evaporation circulating cooling impregnation feeding device.

[0006] The objective of this invention is achieved through the following technical solution: a cadmium liquid vacuum evaporation circulating cooling impregnation feeding device, comprising a molten pool gasifier containing molten iron, an annular skirt on the molten pool gasifier, the lower end of the annular skirt extending into the molten iron, a main jet oxygen lance at the upper end of the annular skirt, a cooling chamber in the annular region between the radial inner and radial outer surfaces of the annular skirt, a double-sided microporous liquid cadmium channel in the cooling chamber, the upper end of the double-sided microporous liquid cadmium channel extending out of the cooling chamber and having a liquid cadmium inlet, and liquid cadmium micropores on the double-sided microporous liquid cadmium channel; a gaseous cadmium outlet at the upper end of the cooling chamber, and a cooling reflux system between the liquid cadmium inlet and the gaseous cadmium outlet; liquid cadmium enters the double-sided microporous liquid cadmium channel from the liquid cadmium inlet and is ejected into the cooling chamber through the liquid cadmium micropores, the liquid cadmium vaporizes in the cooling chamber and is discharged from the gaseous cadmium outlet.

[0007] Preferably, the cooling reflux system includes a circulation pipe, one end of which is connected to the liquid cadmium inlet at the upper end of the microporous liquid cadmium channel, and the other end is connected to the gaseous cadmium outlet. A vacuum pump, a cooler, a constant temperature storage tank, and a high pressure pump are sequentially arranged on the circulation pipe from the gaseous cadmium outlet to the liquid cadmium inlet.

[0008] Preferably, the annular skirt includes an inner wall panel and an outer wall panel, both of which are cylindrical. A bottom wall panel is provided before the bottom of the inner and outer wall panels. A partition is provided between the inner and outer wall panels, dividing the space between the inner and outer wall panels into several cooling chambers. A fixed mounting plate is provided at the upper end of the inner wall panel, and the main jet oxygen lance is mounted on the fixed mounting plate.

[0009] Preferably, the inner wall panel, outer wall panel and bottom wall panel are all made of steel.

[0010] Preferably, the inner wall panel, outer wall panel, and bottom wall panel are all provided with refractory material on the side surface facing away from the cooling cavity.

[0011] Preferably, the annular skirt is provided with four cooling chambers arranged in a circular array on the annular skirt, and the cross-section of the cooling chambers is fan-shaped.

[0012] Preferably, the vacuum level in the cooling chamber is maintained at 133-1333 Pa.

[0013] Preferably, the main jet oxygen lance includes a feed pipe, a main oxygen injection pipe located outside the feed pipe, and an accompanying oxygen pipe located outside the main oxygen injection pipe. A main oxygen injection channel is formed between the feed pipe and the main oxygen injection pipe, and an accompanying oxygen channel is formed between the accompanying oxygen pipe and the main oxygen injection pipe. A main oxygen injection inlet pipe is connected to the main oxygen injection pipe, and an accompanying oxygen inlet pipe is connected to the accompanying oxygen pipe. The lower part of the main oxygen injection pipe is provided with a constriction section, a throat, an expansion section, and a parallel section from top to bottom. The lower end of the feed pipe is located at the position of the constriction section.

[0014] The beneficial effects of this invention are: In this invention, cadmium metal is used as a circulating coolant to cool the annular skirt and the main jet oxygen lance set on the annular skirt, which avoids explosion accidents caused by cooling water leakage, and the cooling efficiency is much higher than that of traditional cooling water. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the main jet oxygen lance.

[0017] Figure 3 This is a cross-sectional view of the structure of the ring-shaped skirt.

[0018] In the diagram: 1. Carbon dioxide and organic solid waste particle inlet; 2. Main jet oxygen lance; 3. Accompanying oxygen jet inlet; 4. High-pressure pump; 5. Constant temperature storage tank; 6. Cooler; 7. Vacuum pump; 8. Molten cadmium liquid; 9. Liquid cadmium inlet; 10. First gaseous cadmium outlet; 11. Second gaseous cadmium outlet; 12. Syngas outlet; 13. Molten pool gasifier; 14. Molten slag; 15. Molten iron; 16. External wall panel. 7. Double-sided microporous liquid cadmium channel; 18. Bottom wall panel; 19. Inner wall panel; 20. High-speed jet of oxygen-carbon dioxide-solid waste particles; 25. Molten pool gasifier cover; 28. Annular skirt; 35. Main oxygen jet inlet; 36. Circulation pipe; 37. Accompanying oxygen pipe; 38. Main oxygen jet pipe; 40. Feeding pipe; 41. Accompanying oxygen inlet pipe; 42. Main oxygen inlet pipe; 43. Cooling chamber; 44. Baffle. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0020] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0022] like Figure 1-3 As shown, a cadmium liquid vacuum evaporation circulating cooling impregnation feeding device includes a molten pool gasifier 13 containing molten iron 15. A syngas outlet 12 is located above the molten pool gasifier 13. An annular skirt 28 is provided on the molten pool gasifier 13, with its lower end extending into the molten iron 15. A cooling chamber 43 is provided in the annular region between the radially inner and radially outer surfaces of the annular skirt 28.

[0023] Specifically, the annular skirt 28 includes an inner wall panel 19 and an outer wall panel 16, both of which are cylindrical. A bottom wall panel 18 is provided between the bottoms of the inner wall panel 19 and the outer wall panel 16. The bottom wall panel 18 is annular and seals the bottom of the annular skirt 28. A partition 44 is provided between the inner wall panel 19 and the outer wall panel 16, dividing the space between the inner wall panel 19 and the outer wall panel 16 into several cooling chambers 43. In this application, there are four partitions 44, which divide the space between the inner wall panel 19 and the outer wall panel 16 into four cooling chambers 43. The four cooling chambers 43 are arranged in a circular array on the annular skirt 28, and the cross-section of each cooling chamber 43 is fan-shaped. The inner wall panel 19, outer wall panel 16, and bottom wall panel 18 are all made of steel, and the outer sides of the inner wall panel 19, outer wall panel 16, and bottom wall panel 18 are all provided with refractory material. The surface of the inner wall panel 19, outer wall panel 16, and bottom wall panel 18 facing away from the cooling chamber is also provided with refractory material.

[0024] The cooling chamber 43 is equipped with a double-sided microporous liquid cadmium channel 17. The upper end of the microporous liquid cadmium channel 17 extends out of the cooling chamber and is equipped with a liquid cadmium inlet 9. The double-sided microporous liquid cadmium channel 17 is equipped with liquid cadmium micropores, which are densely distributed on both sides of the double-sided microporous liquid cadmium channel 17. The upper end of the cooling chamber 43 is equipped with a gaseous cadmium outlet. Specifically, each cooling chamber 43 has two gaseous cadmium outlets at its upper end, namely a first gaseous cadmium outlet 10 and a second gaseous cadmium outlet 11. A cooling reflux system is provided between the liquid cadmium inlet 9 and the gaseous cadmium outlet. Liquid cadmium enters the double-sided microporous liquid cadmium channel 17 from the liquid cadmium inlet 9 and is sprayed into the cooling chamber 43 through the liquid cadmium micropores. The liquid cadmium vaporizes in the cooling chamber 43 and is discharged from the gaseous cadmium outlet.

[0025] Specifically, the cooling reflux system includes a circulation pipe 36, one end of which is connected to the liquid cadmium inlet 9 at the upper end of the microporous liquid cadmium channel, and the other end is connected to the gaseous cadmium outlet. A vacuum pump 7, a cooler 6, a constant-temperature storage tank 5, and a high-pressure pump 4 are sequentially installed on the circulation pipe from the gaseous cadmium outlet to the liquid cadmium inlet.

[0026] A fixed mounting plate is provided at the upper end of the inner wall panel 19, and a main jet oxygen lance 2 is provided at the upper end of the fixed mounting plate. The main jet oxygen lance 2 is vertically mounted on the fixed mounting plate. The main jet oxygen lance 2 includes a feed pipe 40, a main oxygen injection pipe 38 located outside the feed pipe 40, and an accompanying oxygen pipe 37 located outside the main oxygen injection pipe 38. A main oxygen injection channel is formed between the feed pipe 40 and the main oxygen injection pipe 38, and an accompanying oxygen channel is formed between the main oxygen injection pipe 38 and the accompanying oxygen pipe 37. A main oxygen injection inlet pipe 42 is connected to the main oxygen injection pipe 38, and an accompanying oxygen inlet pipe 41 is connected to the accompanying oxygen pipe 37. The main oxygen injection inlet pipe 42 passes through the accompanying oxygen pipe 37, and the position where the main oxygen injection inlet pipe 41 passes through the accompanying oxygen pipe is sealed. The lower part of the main oxygen injection pipe has a constriction section, a throat, an expansion section, and a parallel section from top to bottom, and the lower end of the feed pipe is located at the position of the constriction section. The upper end of the feeding pipe 40 is the carbon dioxide and organic solid waste particle inlet 1, one end of the accompanying oxygen inlet pipe 41 is the accompanying oxygen jet inlet 3, and one end of the main oxygen jet inlet pipe 42 is the main oxygen jet inlet 35. During feeding, a mixed gas flow of carbon dioxide and organic solid waste particles is introduced into the carbon dioxide and organic solid waste particle inlet 1 on the feed pipe 40. At the same time, injection flow oxygen and accompanying flow oxygen are introduced into the main oxygen jet inlet 35 and the accompanying oxygen jet inlet 3, respectively. When the main flow oxygen passes through the constriction section, it forms a supersonic oxygen jet after passing through the constriction section-throat-expansion section, and meets with the mixed gas flow of carbon dioxide and organic solid waste particles to form a high-speed oxygen-CO2-solid waste particle jet 20. The accompanying flow oxygen is located on the periphery of the high-speed oxygen-CO2-solid waste particle jet 20. With the accompaniment of the accompanying flow oxygen on the periphery, the attenuation of the central high-speed jet is greatly reduced. The high-speed jet impacts the molten slag and iron, impacting into the interior of the molten iron. The organic solid waste is cracked and gasified in the molten iron to produce syngas, which is discharged from the syngas outlet 12.

[0027] In this invention, the traditional single oxygen lance feeding is replaced by a main jet oxygen lance 2 combined with an annular skirt 28. The lower end of the annular skirt 28 is inserted into the molten iron 15, and the main jet oxygen lance 2 is placed on top of the annular skirt 28 and completely outside the molten iron pool gasifier, away from the molten iron. The entire production process only requires effective cooling of the annular skirt 28. During the cooling of the annular skirt 28, metallic cadmium is used as the circulating coolant. Liquid cadmium enters the double-sided microporous liquid cadmium channel 17 from the liquid cadmium inlet 9 and is ejected into the cooling chamber through the micropores. The ejected liquid cadmium falls onto the inner wall of the cooling chamber and exchanges heat with the annular skirt 28. After being heated and evaporated, the liquid cadmium forms gaseous cadmium, which is discharged from the gaseous cadmium outlet. A vacuum pump simultaneously evacuates the cooling chamber, maintaining the vacuum level in the cooling chamber at 133-1333. Pa; On the other hand, gaseous cadmium flows in the circulation pipe 36 under the action of vacuum pump 7. After passing through cooler 6, gaseous cadmium is transformed into liquid cadmium. Then, liquid cadmium enters constant temperature storage tank 5. The temperature in constant temperature storage tank 5 is maintained at about 400ºC, so that metallic cadmium is kept in a liquid state. Liquid cadmium re-enters the double-sided microporous liquid cadmium channel 17 under the action of high pressure pump 4, and finally re-enters the cooling chamber to cool down the annular skirt 28. This cycle is repeated to continuously cool the annular skirt 28.

[0028] Cadmium is a low-melting-point, volatile metal with a melting point of 321°C and a boiling point of 767°C at normal pressure. Under vacuum conditions, the boiling point of cadmium decreases. The latent heat of vaporization of liquid cadmium is approximately 100 kJ / mol, or about 889 kJ / kg. If the temperature is increased by 200°C, the heat absorbed by cadmium is 46 kJ / kg. After evaporation, the heat absorbed is approximately 935 MJ per ton of liquid cadmium. In this invention, a vacuum pump 7 maintains the vacuum level in the cooling chamber at 133-1333 Pa. Under this vacuum level, the boiling point of cadmium (Cd) is between 400°C and 500°C.

[0029] Based on a heat flux intensity of 1 MW per square meter, the required heat exchange per square meter of surface area is 1 MW. 3600s = 3600MJ / hr, so the amount of cadmium liquid needed to circulate per hour is 4 tons, with a volume of less than 0.6 cubic meters, which is far less than the volumetric flow rate required for cooling water heat exchange. Therefore, using cadmium as a circulating coolant, under the premise of achieving the same cooling effect, the volume of cadmium required is far less than the volume of cooling water, and the cooling efficiency of cadmium is far higher than that of water.

[0030] Furthermore, liquid cadmium does not dissolve iron, so the annular skirt containing liquid cadmium will not be corroded by metallic cadmium, thus avoiding damage to the annular skirt and ensuring its service life.

[0031] In this invention, cadmium is used as a low-melting-point and low-boiling-point metal. It has the characteristic of easily volatilizing and absorbing heat in a vacuum. The liquid cadmium is evaporated in a vacuum and then condensed back into a liquid state before re-entering the high-temperature zone to be cooled. The liquid cadmium is used as a circulating coolant to cool the annular skirt immersed in the high-temperature environment of the molten iron bath. This avoids explosion accidents caused by cooling water leakage, and the cooling efficiency is much higher than that of traditional cooling water.

[0032] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A cadmium liquid vacuum evaporation circulating cooling immersion charging device comprising a molten bath type gasification furnace in which molten iron liquid is contained, characterized by, The molten pool gasifier is equipped with an annular skirt, the lower end of which extends into the molten iron. The upper end of the annular skirt is equipped with a main jet oxygen lance. A cooling chamber is located in the annular region between the radially inner and radially outer surfaces of the annular skirt. The cooling chamber contains a double-sided microporous liquid cadmium channel with liquid cadmium micropores densely distributed on both sides. The upper end of the double-sided microporous liquid cadmium channel extends out of the cooling chamber and has a liquid cadmium inlet. A gaseous cadmium outlet is located at the upper end of the cooling chamber, and a cooling reflux system is provided between the liquid cadmium inlet and the gaseous cadmium outlet. Liquid cadmium enters the double-sided microporous liquid cadmium channel from the liquid cadmium inlet and is ejected into the cooling chamber through the liquid cadmium micropores. The liquid cadmium vaporizes in the cooling chamber and is discharged from the gaseous cadmium outlet.

2. The cadmium solution vacuum evaporation circulating cooling immersion charging device according to claim 1, characterized in that, The cooling reflux system includes a circulation pipe. One end of the circulation pipe is connected to the liquid cadmium inlet at the upper end of the microporous liquid cadmium channel, and the other end is connected to the gaseous cadmium outlet. A vacuum pump, a cooler, a constant temperature storage tank, and a high pressure pump are sequentially installed on the circulation pipe from the gaseous cadmium outlet to the liquid cadmium inlet.

3. The cadmium solution vacuum evaporation circulating cooling immersion charging device according to claim 1, characterized in that, The annular skirt includes an inner wall panel and an outer wall panel, both of which are cylindrical. A bottom wall panel is provided between the bottom of the inner wall panel and the outer wall panel. A partition is provided between the inner wall panel and the outer wall panel, dividing the space between the inner wall panel and the outer wall panel into several cooling chambers. A fixed mounting plate is provided at the upper end of the inner wall panel, and the main jet oxygen lance is mounted on the fixed mounting plate.

4. The cadmium solution vacuum evaporation circulating cooling immersion charging device according to claim 3, characterized in that, The inner wall panel, outer wall panel, and bottom wall panel are all made of steel.

5. The cadmium solution vacuum evaporation circulating cooling immersion charging device according to claim 4, characterized in that, The inner wall panel, outer wall panel, and bottom wall panel are all provided with refractory material on the side surface away from the cooling cavity.

6. The cadmium solution vacuum evaporation circulating cooling immersion charging device according to claim 3, characterized in that, The annular skirt is provided with four cooling chambers, which are arranged in a circular array on the annular skirt. The cross-section of the cooling chambers is fan-shaped.

7. The cadmium liquid vacuum evaporation circulating cooling impregnation feeding device according to claim 1, characterized in that, The vacuum level in the cooling chamber is maintained at 133-1333 Pa.

8. A cadmium liquid vacuum evaporation circulating cooling impregnation feeding device according to any one of claims 1-7, characterized in that, The main jet oxygen lance includes a feed pipe, a main oxygen injection pipe located outside the feed pipe, and an accompanying oxygen pipe located outside the main oxygen injection pipe. A main oxygen injection channel is formed between the feed pipe and the main oxygen injection pipe, and an accompanying oxygen channel is formed between the accompanying oxygen pipe and the main oxygen injection pipe. A main oxygen injection inlet pipe is connected to the main oxygen injection pipe, and an accompanying oxygen inlet pipe is connected to the accompanying oxygen pipe. The lower part of the main oxygen injection pipe is provided with a constriction section, a throat, an expansion section, and a parallel section from top to bottom. The lower end of the feed pipe is located at the position of the constriction section.

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