Titanium-stainless steel composite embedded ceramic corrosion and wear resistant high pressure jet pump and use method thereof

Abstract

The application discloses a titanium-stainless steel composite embedded ceramic corrosion and wear resistant high-pressure jet pump, which comprises a material mixing chamber, a high-pressure nozzle is inserted into the front end of the material mixing chamber, the hole in the high-pressure nozzle is trumpet-shaped at both ends and is narrowed in the middle to be a straight hole, a high-pressure steam source is connected to the end of the high-pressure nozzle outside the material mixing chamber through a stainless steel pipe, a connecting pipe which is communicated with the material mixing chamber is connected to the lower end of the material mixing chamber, the connecting pipe is connected to a nitric acid source, a throat pipe is inserted into the rear end of the material mixing chamber, the hole in the throat pipe is trumpet-shaped in the middle and is narrowed in the middle to be a straight hole, a ceramic pipe is embedded in the center of the hole in the throat pipe, and a reaction equipment is connected to the end of the throat pipe outside the material mixing chamber through a titanium alloy pipeline. The jet pump is manufactured by welding titanium-stainless steel composite embedded ceramic-titanium alloy materials, has the advantages of convenient cleaning, good sealing performance, full play of the characteristics of various materials, prolonged service life of the high-pressure jet system and reduced manufacturing cost of the system, and is suitable for the fields of petroleum chemical industry and nuclear chemical industry.

Description

Technical Field

[0001] This invention belongs to the technical field of corrosion-resistant and wear-resistant high-pressure jet pumps, specifically relating to a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump and its application method. Background Technology

[0002] A jet pump is a type of fluid power pump. Fluid power pumps have no mechanical transmission or working components; they use the energy of a working fluid as their power source to transport low-energy liquids. They offer good safety when used to pump flammable and explosive materials. High-pressure jet pumps, in particular, use a high-speed jet through a nozzle to remove liquid from a container to dilute the material. The working fluid of a jet pump can be gas (air or steam) or liquid; common types include steam jet pumps, air jet pumps, and water jet pumps.

[0003] In existing technologies, jet pumps are often made from a single material, which cannot adequately meet the requirements of high pressure and the abrasion-resistant working environment of nuclear chemical equipment (which requires resistance to nitric acid (or cationic nitric acid)). Furthermore, existing jet pumps often use flange connections between different parts, which cannot meet the cleaning requirements of petrochemical and nuclear chemical equipment.

[0004] Therefore, it is very urgent to design a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump and its application method. Summary of the Invention

[0005] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump. This high-pressure jet pump provides a sealed cavity environment through a material mixing chamber, facilitating the installation of the high-pressure nozzle, connecting pipe, and throat. This allows for thorough mixing of high-pressure steam entering through the high-pressure nozzle and nitric acid entering through the connecting pipe, followed by high-pressure jetting through the throat. Furthermore, the use of an overfitting ceramic tube embedded in the throat solves both the problem of high-pressure, high-temperature gas resistance and the problem of wear-resistant materials. It offers advantages such as easy cleaning, good sealing, economic efficiency, and extended service life, making it suitable for the petrochemical and nuclear chemical industries.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump, characterized in that the high-pressure jet pump includes a material mixing chamber, a high-pressure nozzle is inserted into the front end of the material mixing chamber, the internal channel of the high-pressure nozzle is flared at both ends and narrowed to a straight hole in the middle, one end of the high-pressure nozzle outside the material mixing chamber is connected to a high-pressure steam source through a stainless steel pipe, the lower end of the material mixing chamber is connected to a connecting pipe communicating with the material mixing chamber, the connecting pipe is connected to a nitric acid source, a throat is inserted into the rear end of the material mixing chamber, the internal channel of the throat is flared and narrowed to a straight hole in the middle, a ceramic tube is embedded in the center of the internal channel of the throat, and the one end of the throat outside the material mixing chamber is connected to a reaction device through a titanium alloy pipeline.

[0007] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the material mixing chamber is formed by explosive composite welding of the stainless steel end of the mixing chamber and the titanium alloy end of the mixing chamber.

[0008] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the material mixing chamber and the high-pressure nozzle are interference-fitted through a stepped hole, and the material mixing chamber and the high-pressure nozzle are fixed by welding.

[0009] The aforementioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the opening angle of the high-pressure nozzle at the end outside the material mixing chamber is 2 to 2.5 times the opening angle at the end inside the material mixing chamber; the length of the high-pressure nozzle at the end outside the material mixing chamber is 3 to 3.5 times the length of the end inside the material mixing chamber; the diameter of the narrowed straight hole in the middle of the high-pressure nozzle is 5 mm to 10 mm, and the length is 5 mm to 20 mm; the material of the high-pressure nozzle is austenitic stainless steel.

[0010] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that one end of the high-pressure nozzle in the material mixing chamber extends into the throat tube, and the length of the extension is 5mm~15mm.

[0011] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the connecting pipe is made of titanium alloy and the connecting pipe is connected to the material mixing chamber by welding.

[0012] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the opening angle of the channel inside the end of the throat tube connected to the material mixing chamber is 1°~5° greater than the opening angle of the channel inside the end away from the material mixing chamber.

[0013] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the throat includes an input end welded to the material mixing chamber and an output end circumferentially welded to the input end. The length of the input end is 0.5 to 0.8 times the length of the output end. The opening of the input end is rounded and chamfered. The wall thickness of the ceramic tube is 3.5 mm to 5 mm. The length of the straight hole section of the ceramic tube is 1 / 26 to 1 / 24 of the overall length of the throat. The ceramic tube and the output end are transitionally fitted.

[0014] The above-mentioned titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump is characterized in that the throat is made of titanium alloy and the throat is connected to the material mixing chamber by welding.

[0015] In addition, the present invention also provides a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump and its method of use, characterized in that the method includes the following steps: Step 1: Turn on the high-pressure steam source and deliver the high-pressure steam through a stainless steel pipe to the high-pressure nozzle and into the material mixing chamber; Step 2: The high-pressure steam introduced in Step 1 generates negative pressure in the material mixing chamber. Nitric acid from the nitric acid source is drawn into the material mixing chamber through the pipe and mixed with the high-pressure steam to form a mixed steam. The nitric acid is concentrated nitric acid or concentrated nitric acid containing cations. Step 3: The mixed vapor generated in Step 2 is driven by high-pressure steam and output to the reaction equipment through the throat and the titanium alloy pipeline connected to the throat.

[0016] In this invention, high-pressure steam enters a stainless steel high-pressure nozzle through a stainless steel pipe. From the inlet of the stainless steel high-pressure nozzle, it flows through a constriction port to increase the gas velocity. After passing through the straight hole of the high-pressure nozzle, it flows out through the diffuser. The high-pressure steam with increased flow velocity generates negative pressure in the titanium-stainless steel material mixing chamber. The inlet end of the material mixing chamber is connected to a titanium alloy connecting pipe. High-concentration nitric acid containing cations enters the material mixing chamber through the connecting pipe due to the negative pressure in the material mixing chamber and mixes with the high-pressure steam. The high-pressure steam mixed with the material passes through the constriction port of the throat tube. Because the high-pressure nozzle extends into the constriction port of the throat tube, the high-pressure airflow increases the flow rate of the mixed high-pressure concentrated nitric acid into the throat tube. In the ceramic-embedded straight hole section of the throat tube, the flow rate of the mixed high-pressure concentrated nitric acid is increased by compression. It then flows out at the flare end of the throat tube and enters the titanium alloy pipeline system.

[0017] Compared with the prior art, the present invention has the following advantages: 1. This invention provides a sealed cavity environment by setting up a material mixing chamber, which facilitates the installation of high-pressure nozzles, connecting pipes, and throat pipes. This allows high-pressure steam entering through the high-pressure nozzles and nitric acid entering through the connecting pipes to be fully mixed and output through the throat pipe, achieving high-pressure injection. Furthermore, the use of an overfitting method to embed ceramic tubes in the throat pipe solves the problems of high-pressure and high-temperature gas resistant materials and wear-resistant materials. It is easy to clean, has good sealing performance, and also takes into account the economy of the injection pump, extending the service life of the injection pump. It is suitable for petrochemical and nuclear chemical industries.

[0018] 2. The ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump of the present invention uses a power unit to drive high-temperature and high-pressure gas through a high-pressure nozzle, then mixes it in a material mixing chamber, diffuses it through a diffusion chamber, and finally sprays it out through the discharge port of the ceramic-embedded titanium alloy throat, thereby achieving the effect of efficiently extracting materials using negative pressure.

[0019] 3. In this invention, high-pressure steam enters a stainless steel high-pressure nozzle through a stainless steel pipe. From the inlet of the stainless steel high-pressure nozzle, it flows through a constriction port to increase the gas flow rate. After passing through the straight hole of the high-pressure nozzle, it flows out through the diffuser. The high-pressure steam with increased flow rate generates negative pressure in the titanium-stainless steel material mixing chamber. The inlet end of the material mixing chamber is connected to a titanium alloy connecting pipe. High-concentration nitric acid containing cations enters the material mixing chamber through the connecting pipe due to the negative pressure in the material mixing chamber and mixes with the high-pressure steam. The high-pressure steam mixed with the material passes through the constriction port of the throat tube. Because the high-pressure nozzle extends into the constriction port of the throat tube, the high-pressure airflow increases the flow rate of the mixed high-pressure concentrated nitric acid into the throat tube. In the straight hole section of the throat tube embedded with ceramic, the flow rate of the mixed high-pressure concentrated nitric acid is increased by compression. It then flows out at the flare end of the throat tube and enters the titanium alloy pipeline system.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump of the present invention.

[0022] Figure 2 This is a schematic diagram showing the connection relationship between the material mixing chamber, high-pressure nozzle, connecting pipe, and throat in the high-pressure jet pump of the present invention.

[0023] Figure 3 yes Figure 2 Enlarged view of point A.

[0024] Figure 4 yes Figure 2 Enlarged view of point B.

[0025] Figure 5This is a schematic diagram of the material mixing chamber in the high-pressure jet pump of the present invention.

[0026] Figure 6 This is a schematic diagram of the ceramic tube structure in the high-pressure jet pump of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1—Material mixing chamber; 1-1—Stainless steel end of mixing chamber; 1-2—Titanium alloy end of mixing chamber; 2—High-pressure nozzle; 3—Connector; 4—Throat; 4-1—Input end; 4-2—Output end; 4-3—Ceramic tube. Detailed Implementation

[0028] The present invention provides a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump, which is described in detail through Example 1.

[0029] Example 1 like Figure 1 and Figure 2 As shown, the titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump of this embodiment includes a material mixing chamber 1. A high-pressure nozzle 2 is inserted into the front end of the material mixing chamber 1. The channels inside the high-pressure nozzle 2 are funnel-shaped at both ends and narrow to straight holes in the middle. One end of the high-pressure nozzle 2 outside the material mixing chamber 1 is connected to a high-pressure steam source through a stainless steel pipe. A connecting pipe 3 communicating with the material mixing chamber 1 is connected to the lower end of the material mixing chamber 1. The connecting pipe 3 is connected to a nitric acid source. A throat 4 is inserted into the rear end of the material mixing chamber 1. The channels inside the throat 4 are funnel-shaped and narrow to straight holes in the middle. A ceramic tube 4-3 is embedded in the center of the channels inside the throat 4. The end of the throat 4 outside the material mixing chamber 1 is connected to the reaction equipment through a titanium alloy pipeline.

[0030] It should be noted that by setting up the material mixing chamber 1 to provide a sealed cavity environment, it is convenient to install the high-pressure nozzle 2, the connecting pipe 3 and the throat 4, so that the high-pressure steam entering through the high-pressure nozzle 2 and the nitric acid entering through the connecting pipe 3 can be fully mixed and output through the throat 4 to achieve high-pressure injection.

[0031] It should be noted that by setting the internal orifice of the high-pressure nozzle 2 to be funnel-shaped at both ends and narrowed to a straight orifice in the middle, the gas flow rate increases as the high-pressure steam passes through the smaller orifice of the internal orifice of the high-pressure nozzle 2. This is equivalent to further pressurizing the high-pressure steam and creating a negative pressure in the material mixing chamber 1, which facilitates the intake of nitric acid. Similarly, by setting the internal orifice of the throat pipe 4 to be funnel-shaped at both ends and narrowed to a straight orifice in the middle, the flow rate of the mixed steam increases as the mixed steam passes through the smaller orifice of the internal orifice of the throat pipe 4. This is equivalent to further pressurizing the mixed steam and achieving high-pressure injection.

[0032] It should be noted that a ceramic tube 4-3 is embedded in the center of the channel inside the throat tube 4. Because ceramic has the characteristics of high temperature resistance, wear resistance, resistance to nitric acid corrosion, and economic practicality, the narrowest part is made of ceramic. If the throat tube 4 were made of titanium alloy, it would be unsuitable for high-pressure steam passage due to its softness and poor wear resistance. Therefore, the embedded ceramic tube 4-3 is chosen to solve the problem of high-pressure and high-temperature gas materials, as well as the problem of wear-resistant materials. At the same time, it also takes into account the economy of the jet pump and extends the service life of the jet pump.

[0033] It should be noted that the length of the ceramic tube 4-3 is greater than the length of the throat tube 4, which narrows into a straight hole in the middle.

[0034] like Figures 3-5 As shown, in this embodiment, the material mixing chamber 1 is formed by explosive composite welding of the stainless steel end 1-1 and the titanium alloy end 1-2. The mixing chamber structure is obtained by machining, with the left end being made of stainless steel and the right end of titanium alloy. Stainless steel is resistant to high temperatures and high pressures, while titanium alloy is resistant to concentrated nitric acid. This design fully utilizes the advantages of each material.

[0035] like Figure 2 and Figure 3 As shown, in this embodiment, the material mixing chamber 1 and the high-pressure nozzle 2 are interference-fitted through a stepped hole, and the material mixing chamber 1 and the high-pressure nozzle 2 are fixed by welding. By using an interference fit between the austenitic stainless steel high-pressure nozzle 2 and the titanium alloy section in the titanium-austenitic stainless steel material mixing chamber 1, with a preferred fitting accuracy of H7 / p6, and by using this hole to guide the high-pressure nozzle 2, the interference fit ensures that there is no gap at the shaft-hole fit, preventing concentrated nitric acid medium from entering the gap between the two metals and preventing electrochemical corrosion.

[0036] like Figure 2As shown, in this embodiment, the opening angle of the end of the high-pressure nozzle 2 outside the material mixing chamber 1 is 2 to 2.5 times the opening angle of the end inside the material mixing chamber 1. The length of the end of the high-pressure nozzle 2 outside the material mixing chamber 1 is 3 to 3.5 times the length of the end inside the material mixing chamber 1. The diameter of the narrowed straight hole in the middle of the high-pressure nozzle 2 is 5 mm to 10 mm, and the length is 5 mm to 20 mm. The material of the high-pressure nozzle 2 is austenitic stainless steel. The purpose of controlling the structural parameters of the high-pressure nozzle 2 is to increase the flow rate of high-pressure steam through a smaller through-hole, thereby forming higher-pressure steam that enters the material mixing chamber 1 and creates a negative pressure within the chamber. The high-pressure nozzle 2 is made of austenitic stainless steel, which has high temperature and high pressure resistance. The length of the end of the high-pressure nozzle 2 outside the material mixing chamber 1 is 3 to 3.5 times the length of the end inside the chamber 1, preferably 3, 3.2, or 3.5 times. The diameter of the narrowed straight hole in the middle of the high-pressure nozzle 2 is 5 mm to 10 mm, preferably 5 mm, 8 mm, or 10 mm, and the length is 5 mm to 20 mm, preferably 5 mm, 10 mm, or 20 mm. like Figure 2 As shown, in this embodiment, one end of the high-pressure nozzle 2, located inside the material mixing chamber 1, extends into the throat 4, with a penetration length of 5mm to 15mm. By extending the outlet of the high-pressure nozzle 2 into the inlet of the throat 4, high-pressure steam can quickly enter the throat 4, and this facilitates the formation of a higher negative pressure at the interface between the throat 4 and the mixing chamber, allowing concentrated nitric acid to quickly enter the throat 4. If the penetration is too long, the negative pressure energy will be weakened; if the penetration is too short, turbulence can easily form in the mixing chamber, which is not conducive to the rapid absorption of concentrated nitric acid. The penetration length is 5mm to 15mm, preferably 5mm, 10mm, or 15mm.

[0037] In this embodiment, the connecting pipe 3 is made of titanium alloy, and the connecting pipe 3 is connected to the material mixing chamber 1 by welding. The titanium alloy material of the connecting pipe 3 is used to prevent corrosion by nitric acid.

[0038] It should be noted that the titanium alloy end of the connecting pipe 3 and the material mixing chamber 1 is connected by welding. After welding, non-destructive testing is performed. Welding can improve the reliability of the connection between the parts and further determine the quality of the weld through non-destructive testing, thus ensuring the quality of the welding.

[0039] like Figure 2 As shown, in this embodiment, the opening angle of the channel inside the end of the throat 4 connected to the material mixing chamber 1 is 1°~5° greater than the opening angle of the channel inside the end away from the material mixing chamber 1. By controlling the opening angle, more of the mixture enters the inlet of the throat 4, is squeezed and mixed again at the inlet, and then pressurized and sprayed out at high speed through the straight pipe section.

[0040] like Figure 2and Figure 6 As shown, in this embodiment, the throat 4 includes an input end 4-1 welded to the material mixing chamber 1 and an output end 4-2 circumferentially welded to the input end 4-1. The length of the input end 4-1 is 0.5 to 0.8 times the length of the output end 4-2. The opening of the input end 4-1 is rounded and chamfered. The wall thickness of the ceramic tube 4-3 is 3.5 mm to 5 mm. The length of the straight hole section of the ceramic tube 4-3 is 1 / 26 to 1 / 24 of the overall length of the throat 4. The ceramic tube 4-3 and the output end 4-2 are transitionally fitted. By designing the throat 4 into two parts, an input end 4-1 and an output end 4-2, it is easier to embed the ceramic tube 4-3 into the output end 4-2, reducing the manufacturing difficulty. The purpose of the parameters of the throat 4 is to increase the flow rate of the mixed gas through the narrowed through-hole, forming a higher pressure mixed gas that enters the reaction equipment. The rounded chamfer allows the mixed materials to be delivered to the throat 4 more quickly. By setting the ceramic tube 4-3 and controlling its parameters, where the length of the ceramic tube 4-3 is greater than the length of the straight hole that narrows in the middle of the throat 4, the problems of high-pressure and high-temperature gas-resistant materials and wear-resistant materials are solved, while also taking into account the jetting. The pump is economical and extends the service life of the jet pump. By transitioning the ceramic tube 4-3 to the output end 4-2, a small gap is maintained between the ceramic tube 4-3 and the titanium alloy material to accommodate the thermal expansion and contraction of materials with different expansion coefficients. The length of the input end 4-1 is 0.5 to 0.8 times the length of the output end 4-2, preferably 0.5, 0.6, or 0.8 times. The wall thickness of the ceramic tube 4-3 is 3.5 mm to 5 mm, preferably 3.5 mm, 4 mm, or 5 mm. The length of the straight hole section of the ceramic tube 4-3 is 1 / 26 to 1 / 24 of the overall length of the throat tube 4, preferably 1 / 26, 1 / 25, or 1 / 24.

[0041] It should be noted that the fitting accuracy between the ceramic tube 4-3 and the titanium alloy structure is K7 / h6.

[0042] It should be noted that the ceramic tube 4-3 is obtained by machining, and is embedded in the titanium alloy by welding between the input end 4-1 of the throat tube 4 and the output end 4-2 of the throat tube 4.

[0043] In this embodiment, the throat 4 is made of titanium alloy, and the throat 4 is connected to the material mixing chamber 1 by welding.

[0044] It should be noted that the throat 4 and the titanium alloy end of the material mixing chamber 1 are connected by welding, and non-destructive testing is performed after welding.

[0045] The method of using a titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump of the present invention is described in detail through Examples 2 to 4.

[0046] Example 2 This embodiment includes the following steps: Step 1: Turn on the high-pressure steam source and deliver the high-pressure steam to the high-pressure nozzle 2 through the stainless steel pipe, and then into the material mixing chamber 1; Step 2: The high-pressure steam introduced in Step 1 generates negative pressure in the material mixing chamber 1, and nitric acid from the nitric acid source is drawn into the material mixing chamber 1 through the pipe 3 and mixed with the high-pressure steam to form a mixed steam; the nitric acid is concentrated nitric acid. Step 3: The mixed vapor generated in Step 2 is driven by high-pressure steam and output to the reaction equipment through throat 4 and the titanium alloy pipeline connected to throat 4.

[0047] Example 3 This embodiment includes the following steps: Step 1: Turn on the high-pressure steam source and deliver the high-pressure steam to the high-pressure nozzle 2 through the stainless steel pipe, and then into the material mixing chamber 1; Step 2: The high-pressure steam introduced in Step 1 generates negative pressure in the material mixing chamber 1. Through pipe 3, nitric acid from the nitric acid source is drawn into the material mixing chamber 1 and mixed with the high-pressure steam to form a mixed vapor. The nitric acid is Na-containing... + Concentrated nitric acid with cations; Step 3: The mixed vapor generated in Step 2 is driven by high-pressure steam and output to the reaction equipment through throat 4 and the titanium alloy pipeline connected to throat 4.

[0048] Example 4 This embodiment includes the following steps: Step 1: Turn on the high-pressure steam source and deliver the high-pressure steam to the high-pressure nozzle 2 through the stainless steel pipe, and then into the material mixing chamber 1; Step 2: The high-pressure steam introduced in Step 1 generates negative pressure in the material mixing chamber 1. Through pipe 3, nitric acid from the nitric acid source is drawn into the material mixing chamber 1 and mixed with the high-pressure steam to form a mixed vapor. The nitric acid is Ca-containing... 2+ Concentrated nitric acid with cations; Step 3: The mixed vapor generated in Step 2 is driven by high-pressure steam and output to the reaction equipment through throat 4 and the titanium alloy pipeline connected to throat 4.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump, characterized in that, The high-pressure jet pump includes a material mixing chamber (1), with a high-pressure nozzle (2) inserted at the front end of the material mixing chamber (1). The internal channel of the high-pressure nozzle (2) is funnel-shaped at both ends and narrows to a straight hole in the middle. One end of the high-pressure nozzle (2) outside the material mixing chamber (1) is connected to a high-pressure steam source via a stainless steel pipe. The lower end of the material mixing chamber (1) is connected to a connecting pipe (3) that communicates with the material mixing chamber (1). The connecting pipe (3) is connected to a nitric acid source. A throat (4) is inserted at the rear end of the material mixing chamber (1). The internal channel of the throat (4) is funnel-shaped and narrows to a straight hole in the middle. A ceramic tube (4-3) is embedded in the center of the channel inside the throat tube (4). The end of the throat tube (4) outside the material mixing chamber (1) is connected to the reaction equipment through a titanium alloy pipeline. The material mixing chamber (1) is formed by explosive composite welding of the stainless steel end (1-1) and the titanium alloy end (1-2) of the mixing chamber. The opening angle of the end of the high-pressure nozzle (2) outside the material mixing chamber (1) is 2 to 2.5 times the opening angle of the end inside the material mixing chamber (1). The length of the end of the high-pressure nozzle (2) outside the material mixing chamber (1) is equal to the length of the end inside the material mixing chamber (1). The length of the inner end is 3 to 3.5 times that of the outer end. The diameter of the narrowed straight hole in the middle of the high-pressure nozzle (2) is 5 mm to 10 mm, and the length is 5 mm to 20 mm. The material of the high-pressure nozzle (2) is austenitic stainless steel. The end of the high-pressure nozzle (2) in the material mixing chamber (1) extends into the throat tube (4) by 5 mm to 15 mm. The wall thickness of the ceramic tube (4-3) is 3.5 mm to 5 mm. The length of the straight hole section of the ceramic tube (4-3) is 1 / 26 to 1 / 24 of the overall length of the throat tube (4). The ceramic tube (4-3) and the output end (4-2) Transition fit; The throat (4) includes an input end (4-1) welded to the material mixing chamber (1) and an output end (4-2) circumferentially welded to the input end (4-1). The length of the input end (4-1) is 0.5 to 0.8 times the length of the output end (4-2). The opening of the input end (4-1) is rounded and chamfered. The material of the connecting pipe (3) is titanium alloy. The connecting pipe (3) is connected to the material mixing chamber (1) by welding. The throat (4) is made of titanium alloy. The throat (4) is connected to the material mixing chamber (1) by welding. The method of using the titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump includes the following steps: Step 1: Turn on the high-pressure steam source and deliver the high-pressure steam to the high-pressure nozzle (2) through the stainless steel pipe, and then enter the material mixing chamber (1); Step 2: The high-pressure steam entering in Step 1 generates negative pressure in the material mixing chamber (1), and through the pipe (3) it draws nitric acid from the nitric acid source into the material mixing chamber (1) and mixes it with the high-pressure steam to form a mixed steam; the nitric acid is concentrated nitric acid; Step 3: The mixed vapor generated in Step 2 is driven by high-pressure steam and output to the reaction equipment through the throat (4) and the titanium alloy pipeline connected to the throat (4).

2. The titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump according to claim 1, characterized in that, The material mixing chamber (1) and the high-pressure nozzle (2) are interference-fitted through a stepped hole, and the material mixing chamber (1) and the high-pressure nozzle (2) are fixed by welding.

3. The titanium-stainless steel composite ceramic-embedded corrosion-resistant and wear-resistant high-pressure jet pump according to claim 1, characterized in that, The opening angle of the channel inside the throat (4) connected to the material mixing chamber (1) is 1°~5° greater than the opening angle of the channel inside the end away from the material mixing chamber (1).

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