CN115259340A

CN115259340A - Salt discharging device for supercritical water oxidation system

Info

Publication number: CN115259340A
Application number: CN202211031133.6A
Authority: CN
Inventors: 边柳
Original assignee: Beijing Xinfeng Aerospace Equipment Co Ltd
Current assignee: Beijing Xinfeng Aerospace Equipment Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2022-11-01

Abstract

The invention relates to a salt discharging device for a supercritical water oxidation system, which comprises a reaction kettle (1) and is characterized in that a salt discharging slope (3) is arranged above a bottom outlet (9) of the reaction kettle (1), a plurality of stirring paddles (4) are also arranged on the salt discharging slope (3), the bottom outlet (9) of the reaction kettle (1) is connected with a salt storage tank (5), a spiral salt discharging device (6) is arranged in the salt storage tank (5), a rotating motor (10) is arranged in the salt storage tank (5), and the rotating motor (10) is connected with the spiral salt discharging device (6) in the salt storage tank (5); the side surface of the lower part of the salt storage tank (5) is also connected with a salt discharge pipe (8), and the middle part of the salt discharge pipe (8) is provided with an electromagnetic high-pressure valve (7); according to the invention, the spiral salt discharger is added, and deposited salt generated by supercritical water oxidation or deposited salt in non-supercritical water can be mechanically discharged to the outside, so that salt blockage is reduced.

Description

Salt discharging device for supercritical water oxidation system

Technical Field

The invention relates to a salt discharge device for a supercritical water oxidation system, which is used for smoothly discharging salt in the supercritical water oxidation system.

Technical Field

Supercritical water oxidation is a promising technology, and the supercritical water oxidation is the most promising waste treatment technology in "energy and environment". One of the biggest problems with this technique, however, is clogging with deposited salt. Researchers have divided the salts into two categories depending on the nature of the brine mixture: the diluted aqueous solution of the first type of salt forms a saturated liquid and saturated vapor of the salt in supercritical water; the diluted aqueous solution of the second salt forms a supercritical water phase and a solid salt phase. Supercritical water oxidation (SCWO) is an effective water treatment technology. Commercialization of SCWO processes has been hindered by corrosion and fouling/scaling problems that must be addressed through system design and/or operating procedures. Salts are formed in SCWO processes when the acidic solution is neutralized to reduce corrosion, and may also be present in the waste stream. Because of the low solubility of salts in supercritical water, salts precipitate. The precipitated salts generally form agglomerates and cover the inner surface, thereby inhibiting heat transfer from the outer surface to the outer surface. When fouling is uncontrolled, plugging of the transfer lines and/or the reactor may occur. In the SCWO process, the required cleaning may result in a large and expensive down time.

Disclosure of Invention

The invention aims to provide a salt discharging device for a supercritical water oxidation system, so that salt can be smoothly discharged in supercritical water.

A salt discharging device for a supercritical water oxidation system comprises a reaction kettle 1 and is characterized in that a salt discharging slope 3 is arranged above an outlet 9 at the bottom of the reaction kettle 1, a plurality of stirring paddles 4 are further arranged on the salt discharging slope 3, the outlet 9 at the bottom of the reaction kettle 1 is connected with a salt storage tank 5, a spiral salt discharging device 6 is arranged in the salt storage tank 5, a rotating motor 10 is arranged in the salt storage tank 5, and the rotating motor 10 is connected with the spiral salt discharging device 6 in the salt storage tank 5; the side surface of the lower part of the salt storage tank 5 is also connected with a salt discharge pipe 8, and the middle part of the salt discharge pipe 8 is provided with an electromagnetic high-pressure valve 7;

a cooling coil 2 is arranged outside the lower part of the reaction kettle 1 at the upper part of the salt discharge slope 3, and cooling water is filled in the cooling coil 2.

The included angle of the salt discharging slope 3 is less than 135 degrees.

The cooling coil 2 is made of a high temperature resistant metal material.

The stirring paddle 4 and the rotating motor 10 are internally provided with a heat insulation assembly.

The invention has the technical advantages that:

1. the active cooling system of the invention enables the deposited salt in the supercritical water to be dissolved in the region without supercritical water;

2. according to the invention, the stirring paddle is added, so that the deposited salt at the slope falls into the salt storage tank after being disturbed.

3. According to the spiral salt discharger, the deposited salt generated by supercritical water oxidation or deposited salt in non-supercritical water can be discharged outside mechanically, so that salt blockage is reduced.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Wherein, 1 is reation kettle, 2 is cooling coil, 3 is the salt discharge slope, 4 is the stirring rake, 5 is the salt storage tank, 6 is the spiral salt discharging ware, 7 is the electromagnetism high-pressure valve, 8 is the salt discharge mouth, 9 is the bottom export, 10 is the rotating electrical machines.

Detailed Description

The included angle of the salt discharging slope 3 is less than 135 degrees.

The cooling coil 2 is made of a high temperature resistant metal material.

Reaction kettle 1: and the reaction vessel is used for raising the temperature and the pressure to a supercritical state and carrying out supercritical water oxidation reaction.

Cooling coil 2: the position is at the lower end of the reaction kettle, a cooling pipe is coiled outside the reaction kettle, and cooling water is introduced into the cooling pipe. Used for actively cooling and reducing the temperature in the reaction kettle to below 374 ℃. Become supercritical water non-supercritical water with supercritical water, salt can be dissolved in non-supercritical water like this, reduces and avoids blockking up. And a heat preservation layer is added outside the coil pipe for heat preservation. The coil is made of metal material 316 or 304 stainless steel and is high temperature resistant.

Salt discharge slope 3: and a salt discharge slope is arranged on the lower side of the position of the cooling water pipe, so that the outward discharge of some salts insoluble in supercritical water and non-supercritical water is enhanced. The included angle of the slopes at the two sides is less than 135 degrees. The spiral stirring discharge device is beneficial to the sliding of the salt to the lower side.

And (4) stirring paddle: the salt discharging device comprises a stirring paddle and a driving motor, wherein the paddle is arranged on a salt discharging slope, and the driving motor is arranged outside the slope. The peer location is installed 2. Electrically driven and opened when the salt needs to be discharged. The stirring paddle and the motor need to be provided with a heat insulation component. The device is used for the disturbance and discharge of deposited salt at the slope.

A salt storage tank 5: the reactor is positioned at the bottom end of the reaction kettle and is a cylinder and a pressure-bearing container. Used for temporarily storing the deposited salt in the supercritical water oxidation process.

Spiral salt discharger 6: mainly comprises a shaft, a helical blade and a motor, and is positioned in the salt storage tank, and the motor is arranged at the bottommost part. The shaft and the helical blade are made of metal materials, are resistant to high temperature and salt corrosion, the bottom motor also has high temperature resistance, and a heat insulation assembly is installed to insulate heat by similar aerogel and other materials. Generally used for the salt elimination process when the supercritical water oxidation system is cooled to the room temperature after shutdown. The spiral blade of the motor is turned on to rotate, and the deposited salt is driven to be discharged to the salt outlet.

Electromagnetic high-pressure valve 7: electromagnetic relay control's high-pressure valve can open and shut under the high-pressure condition, and this condition is not used when the high temperature under, needs under the special condition, when opening under the condition of supercritical water, opens the cooling water and can make the temperature cool off to below 100 ℃, and it is outer to open the back salt water and arrange. Generally, when the salt content is low, the salt generated by the reaction is stored in a salt storage tank, and after a period of time, the maintenance process is stopped to discharge the salt water. If the operation lasts, when supercritical water needs the online salt of discharging, can briefly open the electromagnetism high-pressure valve, discharge some salt.

Salt discharge pipe 8: used for discharging brine.

Particularly, the metal material connected with the reaction kettle is selected from the same material as the reaction kettle, such as nickel-based alloy and the like. Particularly, the motor is in contact with the reaction kettle and the salt storage tank, and a transmission rod is required to be added to ensure that a certain distance is kept between the motor and a heat source in space, so that overheating failure is avoided.

A salt discharging device for a supercritical water oxidation system is characterized by mainly comprising a reaction kettle, a cooling coil, a stirring paddle, a salt discharging slope, a stirring paddle, a salt storage tank, a spiral salt discharging device, an electromagnetic high-pressure valve, a salt discharging port and the like, and related electric drives. According to the reaction process, one of the salts generated in the supercritical water oxidation is actively cooled to improve the solubility of the salts, and the other is actively rotated to discharge the salts, so that the salt blockage is prevented.

Claims

1. A salt discharging device for a supercritical water oxidation system comprises a reaction kettle (1) and is characterized in that a salt discharging slope (3) is arranged above a bottom outlet (9) of the reaction kettle (1), a plurality of stirring paddles (4) are further arranged on the salt discharging slope (3), the bottom outlet (9) of the reaction kettle (1) is connected with a salt storage tank (5), a spiral salt discharging device (6) is arranged in the salt storage tank (5), a rotating motor (10) is arranged in the salt storage tank (5), and the rotating motor (10) is connected with the spiral salt discharging device (6) in the salt storage tank (5); the side surface of the lower part of the salt storage tank (5) is also connected with a salt discharge pipe (8), and the middle part of the salt discharge pipe (8) is provided with an electromagnetic high-pressure valve (7);

a cooling coil (2) is arranged outside the lower part of the reaction kettle (1) at the upper part of the salt discharge slope (3), and cooling water is introduced into the cooling coil (2).

2. The salt elimination device for supercritical water oxidation system according to claim 1, characterized by that the included angle of the salt elimination slope (3) is less than 135 °.

3. A salt discharging device for supercritical water oxidation system according to claim 1 or 2, characterized in that the cooling coil (2) is made of high temperature resistant metal material.

4. The salt discharging device for the supercritical water oxidation system according to claim 1 or 2, wherein the stirring paddle (4) and the rotating electrical machine (10) are internally provided with heat insulation components.