A front-end phosphorus fixation incineration method and system for treating radioactive organic phosphorus waste liquid

Abstract

The present application relates to a kind of front-end phosphorus fixation incineration method and system for treating radioactive organic phosphorus waste liquid, comprising the following steps: (1) organic phosphorus waste liquid treatment: radioactive organic phosphorus waste liquid is treated, and the feed liquid satisfying the delivery demand and incineration heat value demand is prepared;(2) feed liquid incineration and phosphorus fixation: the feed liquid is incinerated in the combustion chamber, and phosphorus fixation is carried out;(3) high-temperature flue gas filtration: dust-containing flue gas flowing out of the combustion chamber is filtered by sedimentation chamber, cyclone filter and other equipment.Relative to the method of phosphorus removal by leaching, the present application does not generate radioactive secondary waste liquid, reduces the corrosion of flue gas on pipeline, and removes most of the salt and part of radioactive smoke dust at the front end.

Description

Technical Field

[0001] This invention belongs to the field of radioactive waste treatment technology, specifically relating to a front-end phosphorus solidification incineration method and system for treating radioactive organophosphorus waste liquid. Background Technology

[0002] The extraction process in nuclear chemical engineering generates radioactive organic waste liquid. During long-term operation, the extractant deteriorates due to acidolysis and radiolysis, reducing extraction efficiency. To ensure extraction efficiency, the extractant needs to be distilled and purified. However, the distillation residue produced in this process contains the vast majority of the radioactive elements from the extractant and is therefore radioactive organic waste liquid that requires treatment.

[0003] The treatment of radioactive organophosphorus wastewater presents challenges. Organophosphorus extractants (such as TBP, TRPO, and CMPO) are commonly used in nuclear chemical processes, and the resulting radioactive organic wastewater also contains organophosphorus components. Existing treatment methods include pyrolysis incineration, wet oxidation, and direct incineration. However, pyrolysis incineration suffers from difficulties in emulsion preparation and is ill-suited for treating other types of organophosphorus wastewater; wet oxidation generates secondary radioactive wastewater; and direct incineration is problematic due to corrosion caused by phosphorus oxides and the generation of secondary wastewater from alkaline leaching for phosphorus removal.

[0004] This invention reduces pipeline corrosion during the incineration of radioactive organophosphorus waste liquid by fixing phosphorus at the front end. Radioactive organophosphorus waste liquid produces a large amount of phosphorus oxides during incineration, and phosphoric acid is generated as the flue gas cools, leading to pipeline corrosion. This invention fixes phosphorus by directly adding alkali powder / alkali solution into the incineration chamber during the incineration process, thereby reducing the corrosion of pipelines by phosphorus oxides. Summary of the Invention

[0005] To address the corrosion problem in the incineration treatment of radioactive organophosphorus waste liquid, the present invention aims to provide a front-end phosphorus solidification incineration method and system for treating radioactive organophosphorus waste liquid. Compared with phosphorus removal methods by rinsing, the present invention does not generate radioactive secondary waste liquid, reduces the corrosion of pipelines by flue gas, and removes most of the salt and some radioactive dust at the front end.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A front-end phosphorus fixation incineration method for treating radioactive organophosphorus waste liquid, the method comprising the following steps:

[0008] (1) Treatment of organophosphorus waste liquid: Radioactive organophosphorus waste liquid is treated to obtain a liquid that meets the requirements for transportation and incineration calorific value.

[0009] (2) Liquid incineration and phosphorus fixation: The liquid is incinerated and phosphorus is fixed in the combustion chamber;

[0010] (3) High-temperature flue gas filtration: The dust-laden flue gas flowing out of the combustion chamber is filtered through equipment such as settling chambers and cyclone filters.

[0011] Furthermore, in the aforementioned method for front-end phosphorus fixation and incineration of radioactive organophosphorus waste liquid, step (1) includes:

[0012] (1.1) Mixing and viscosity adjustment: The viscosity and overall calorific value of the liquid are adjusted by adding kerosene to the radioactive organophosphorus waste liquid;

[0013] (1.2) Liquid filtration: The particulate matter in the liquid is filtered through a liquid filter.

[0014] Furthermore, in the aforementioned method for front-end phosphorus fixation and incineration of radioactive organophosphorus waste liquid, step (2) includes:

[0015] (2.1) Liquid combustion: Liquid is sprayed into the small furnace from the combustion nozzle, and is initially mixed and burned with primary air, and then enters the main furnace for further high-temperature combustion;

[0016] (2.2) The front-end phosphorus fixation method is to add alkali powder or alkali solution for phosphorus fixation;

[0017] (2.3) Front-end alkali powder fixation of phosphorus: Alkali powder is added to the secondary air and enters the combustion furnace with the secondary air. The alkali powder directly reacts with the phosphorus oxides generated by combustion at high temperature to generate phosphate / pyrophosphate.

[0018] (2.4) Front-end alkaline solution for phosphorus fixation: Alkaline solution is sprayed into the incinerator through an alkaline solution nozzle. The alkaline solution directly reacts with the phosphorus oxides generated during incineration at high temperature to produce phosphate / pyrophosphate.

[0019] (2.5) The operation process of the combustion chamber is as follows: the furnace temperature of the combustion chamber is preheated to 850°C by burning fuel oil; then alkali powder (or alkali solution) is introduced into the combustion chamber, and then the feed pipeline is switched so that the combustion nozzle sprays the liquid material to burn the liquid material.

[0020] Step (2) also includes:

[0021] Fuel oil is injected during the preheating stage using the same combustion nozzle, while liquid feed is injected during the liquid feed combustion stage. A valve is provided to switch between the two liquid feeds.

[0022] Preferably, the incineration nozzle is a dual-flow atomizing nozzle.

[0023] Preferably, the combustion chamber is a vertical refractory furnace structure.

[0024] Preferably, the combustion chamber furnace body consists of refractory material, insulation material, and steel shell from the inside out, and can withstand long-term use at 1300℃.

[0025] Preferably, the alkali powder is lime powder.

[0026] Preferably, the alkali powder is stored in an alkali powder storage tank, which is located above the secondary air duct and enters the secondary air duct by gravity. The alkali powder is fully carried by the secondary air through the Venturi structure.

[0027] Preferably, the alkaline solution is a sodium carbonate solution.

[0028] Preferably, the alkali solution is injected into the combustion chamber through a pipeline with a water-cooled jacket.

[0029] Furthermore, in the aforementioned method for front-end phosphorus fixation and incineration of radioactive organophosphorus waste liquid, step (3) includes:

[0030] (3.1) Smoke settling: The flue gas produced by incineration contains a large amount of phosphate. In the settling chamber, large particles of phosphate / pyrophosphate are settling by reducing the flue gas velocity, and other radioactive dust is carried in the process.

[0031] (3.2) Cyclone dust removal: After settling, the dust-laden flue gas passes through a cyclone dust collector, where the centrifugal force generated by the rotation of the dust-laden airflow is used to further separate the salt and radioactive dust.

[0032] Step (3) also includes:

[0033] Preferably, the settling chamber is located below the secondary combustion chamber to prevent the deposition of soot in the secondary combustion chamber.

[0034] Preferably, the inlet of the settling chamber is provided with a narrow opening, which allows the salt particles to fully collide with the radioactive dust at this point, further improving the carrying capacity of the salt particles for the radioactive dust.

[0035] Preferably, the settling chamber and cyclone dust collector are equipped with an insulation layer to ensure that the temperature of the outer surface of the equipment is below 60°C.

[0036] This invention also discloses a front-end phosphorus fixation incineration system for treating radioactive organophosphorus waste liquid, including a batching station 1, a combustion chamber 2, and a high-temperature flue gas filtration device 3. The batching station 1 includes a liquid mixing tank 11, a liquid filtration and separation device 12, a liquid buffer tank 13, and a transfer pump 14. Radioactive organophosphorus waste liquid and kerosene are added to the liquid mixing tank 11 in proportion via a metering pump to prepare a liquid with a viscosity suitable for conveying and a calorific value suitable for combustion. Since the radioactive organophosphorus waste liquid contains a large number of solid particles, the prepared liquid is filtered through the liquid filtration and separation device 12. After filtration, the liquid is stored in the liquid buffer tank 13. During incineration, the liquid is sent to the combustion chamber 2 by the transfer pump 14. The combustion chamber 2 provides high-temperature combustion for the flue gas and performs front-end phosphorus fixation. Its main function is to realize the combustion of fuel oil and liquid, as well as phosphorus fixation using alkali powder / alkali solution.

[0037] Furthermore, the combustion chamber 2 is a vertical refractory furnace structure, including a small furnace 21, a main furnace 22, refractory material 23, insulation material 24, a steel shell 25, a secondary air mixing inlet 26, an alkali powder storage tank 27, an alkali powder valve 28, and a venturi 29. From the inside out, the furnace body of the combustion chamber 2 consists of refractory material 23, insulation material 24, and a steel shell 25. The small furnace 21 includes a combustion nozzle 211, an igniter 212, and a primary air mixing inlet 213. The main furnace 22 is located inside the combustion chamber 2, where the material is fully combusted in a high-temperature environment of 850–1100°C with excess air, and the flue gas remains... The time is no less than 2 seconds; the alkali powder storage tank 27 is located above the secondary air mixing port 26, and the alkali powder valve 28 is located between the alkali powder storage tank 27 and the secondary air mixing port 26. After the alkali powder valve 28 is opened, the alkali powder falls into the venturi 29 by gravity; the secondary air mixing port 26 is connected from the outside of the combustion chamber 2 to the main furnace 22, supplying secondary air to the main furnace 22; a venturi 29 is provided in the pipeline, through which the alkali powder is fully mixed into the secondary air; the combustion nozzle 211 uses compressed air to atomize fuel oil or liquid feed to ensure complete combustion; the feed of the combustion nozzle 211 is controlled by a valve, which can switch between fuel oil and liquid feed.

[0038] The beneficial effects of this invention are as follows: The front-end phosphorus fixation incineration method and system for treating radioactive organophosphorus waste liquid, as described in this invention, directly adds alkali to the incineration chamber to neutralize and fix the phosphorus oxides generated during incineration, reducing the corrosion of pipelines by phosphorus oxides and phosphoric acid. The flue gas after incineration is filtered using a filtration device to remove most of the phosphate / pyrophosphate, and in this process, some radioactive dust is also removed through the collision and carry-over effect of salts. This organophosphorus waste liquid incineration method does not generate radioactive secondary waste liquid, reduces the corrosion of pipelines by flue gas, and removes most of the salts and some radioactive dust at the front end, demonstrating good inventiveness and practicality. Attached Figure Description

[0039] Figure 1 A schematic flowchart of a front-end phosphorus solidification incineration method for treating radioactive organophosphorus waste liquid provided by the present invention.

[0040] Figure 2 A schematic diagram of the combustion chamber operation process of a front-end phosphorus solidification incineration method for treating radioactive organophosphorus waste liquid provided by the present invention.

[0041] Figure 3 This is a schematic diagram of the structure and working process of a front-end phosphorus solidification incineration system for treating radioactive organophosphorus waste liquid provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the combustion chamber provided in an embodiment of the present invention.

[0043] Attached image annotations:

[0044] 1. Batching station; 11. Liquid mixing tank; 12. Liquid filtration and separation equipment; 13. Liquid buffer tank; 14. Conveying pump; 2. Combustion chamber; 21. Small furnace; 211. Incineration nozzle; 212. Ignition device; 213. Primary air mixing vent; 22. Main furnace; 23. Refractory material; 24. Thermal insulation material; 25. Steel shell; 26. Secondary air mixing vent; 27. Alkali powder storage tank; 28. Alkali powder valve; 29. ​​Venturi; 3. High-temperature flue gas filtration equipment; 31. Settling chamber; 32. Cyclone dust collector. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0046] like Figure 1 , Figure 2 As shown, this embodiment also discloses a front-end phosphorus fixation incineration method for treating radioactive organophosphorus waste liquid, including the following steps:

[0047] (1) Treatment of organophosphorus waste liquid: Radioactive organophosphorus waste liquid is treated to obtain a liquid that meets the requirements for transportation and incineration calorific value.

[0048] (2) Liquid incineration and phosphorus fixation: The liquid is incinerated and phosphorus is fixed in the combustion chamber;

[0049] (3) High-temperature flue gas filtration: The dust-laden flue gas flowing out of the combustion chamber is filtered through equipment such as settling chambers and cyclone filters.

[0050] In this embodiment, step (1) includes:

[0051] (1.1) Mixing and viscosity adjustment: The viscosity and overall calorific value of the liquid are adjusted by adding kerosene to the radioactive organophosphorus waste liquid;

[0052] (1.2) Liquid filtration: The particulate matter in the liquid is filtered through a liquid filter.

[0053] Step (2) includes:

[0054] (2.1) Liquid combustion: Liquid is sprayed into the small furnace from the combustion nozzle, and is initially mixed and burned with primary air, and then enters the main furnace for further high-temperature combustion;

[0055] (2.2) The front-end phosphorus fixation method is to add alkali powder or alkali solution for phosphorus fixation;

[0056] (2.3) Front-end alkali powder phosphorus fixation: Alkali powder is added to the secondary air and enters the combustion furnace with the secondary air. The alkali powder directly reacts with the phosphorus oxides generated during combustion at high temperature to produce phosphate / pyrophosphate;

[0057] (2.4) Front-end alkaline solution for phosphorus fixation: Alkaline solution is sprayed into the incinerator through an alkaline solution nozzle. The alkaline solution directly reacts with the phosphorus oxides generated during incineration at high temperature to produce phosphate / pyrophosphate.

[0058] (2.5) The operation process of the combustion chamber is as follows: First, use fuel oil / gas to ignite and inject fuel oil into the combustion nozzle. The furnace temperature of the combustion chamber is preheated to 850°C by burning the fuel oil. Then, alkali powder (or alkali solution) is introduced into the combustion chamber. Then, the feed pipeline is switched so that the combustion nozzle injects liquid material to burn the liquid material.

[0059] In step (2), fuel oil is injected during the preheating stage using the same combustion nozzle, while liquid feed is injected during the liquid feed combustion stage. A valve is provided to switch between the two liquid feeds.

[0060] In step (2), the combustion nozzle is a dual-flow atomizing nozzle made of Hastelloy alloy; the combustion chamber is a vertical refractory furnace structure, and the furnace body of the combustion chamber consists of refractory material, insulation material, and steel shell from the inside out, which can withstand long-term use at 1300℃.

[0061] In step (2), the alkali powder is lime powder, which is stored in an alkali powder storage tank located above the secondary air duct. It enters the secondary air duct by gravity, and the alkali powder is fully carried by the secondary air through the Venturi structure. The alkali solution is a sodium carbonate solution, which is sprayed into the combustion chamber through a pipeline with a water-cooled jacket.

[0062] Step (3) includes:

[0063] (3.1) Smoke settling: The flue gas produced by incineration contains a large amount of phosphate. In the settling chamber, the large particles of phosphate / pyrophosphate are settled by reducing the flue gas velocity, and other radioactive dust is carried in the process.

[0064] (3.2) Cyclone dust removal: After settling, the dust-laden flue gas passes through a cyclone dust collector, where the centrifugal force generated by the rotation of the dust-laden airflow is used to further separate the salt and radioactive dust.

[0065] In step (3), the settling chamber is located below the secondary combustion chamber to prevent the deposition of soot in the secondary combustion chamber.

[0066] In step (3), a narrow opening is provided at the entrance of the settling chamber, so that the salt particles can fully collide with the radioactive dust at this point, further improving the carrying capacity of the salt particles for the radioactive dust.

[0067] In step (3), the settling chamber and cyclone dust collector are equipped with a heat insulation layer to ensure that the temperature of the outer surface of the equipment is below 60°C.

[0068] like Figure 3 , Figure 4 As shown in the figure, this embodiment also discloses an improved pyrolysis incineration system for combustible radioactive waste, including a batching station 1, a combustion chamber 2, and a high-temperature flue gas filtration device 3.

[0069] In this embodiment, the batching station 1 includes a liquid mixing tank 11, a liquid filtration and separation device 12, a liquid buffer tank 13, and a transfer pump 14. Radioactive organophosphorus waste liquid and kerosene are added to the liquid mixing tank 11 in proportion via a metering pump to prepare a liquid with a viscosity suitable for conveying and a calorific value suitable for combustion. Since the radioactive organophosphorus waste liquid contains a large number of solid particles, the prepared liquid is filtered through the liquid filtration and separation device 12. After filtration, the liquid is stored in the liquid buffer tank 13 and then pumped into the combustion chamber 2 by the transfer pump 14 during incineration.

[0070] Combustion chamber 2 provides high-temperature combustion for flue gas and performs front-end phosphorus fixation. Its main functions are to achieve fuel oil and liquid feed combustion, as well as phosphorus fixation using alkali powder / alkali solution. The combustion and phosphorus fixation effects of the liquid feed are the main factors that directly affect the normal operation of subsequent process equipment.

[0071] Combustion chamber 2 is a vertical refractory furnace structure, including a small furnace 21, a main furnace 22, refractory material 23, insulation material 24, a steel shell 25, a secondary air mixing inlet 26, an alkali powder storage tank 27, an alkali powder valve 28, and a venturi 29. From the inside out, the furnace body of combustion chamber 2 consists of refractory material 23, insulation material 24, and a steel shell 25. The small furnace 21 includes a combustion nozzle 211, an igniter 212, and a primary air mixing inlet 213. The main furnace 22 is located inside combustion chamber 2, where the material is fully combusted in a high-temperature environment of 850–1100℃ with excess air, and the flue gas residence time is no less than 2 seconds. The alkali powder storage tank 27 is located above the secondary air mixing inlet 26, and the alkali powder valve 28 is located between the alkali powder storage tank 27 and the secondary air mixing inlet 26. After opening the alkali powder valve 28, the alkali powder falls into the venturi 29 by gravity. Secondary air mixing inlet 26 connects to the main furnace 22 from the outside of combustion chamber 2, supplying secondary air to the main furnace 22. A venturi 29 is installed in the pipeline, through which alkali powder is fully mixed into the secondary air. Combustion nozzle 211 uses compressed air to atomize fuel oil or liquid feedstock to ensure complete combustion. The feed to combustion nozzle 211 is controlled by a valve, allowing switching between fuel oil and liquid feedstock.

[0072] During the incineration of the liquid feedstock, the liquid feedstock is injected into the small furnace 21 through the incineration nozzle 211, where it is initially mixed and combusted with the primary air supplied through the primary air mixing port 213. It then enters the main furnace 22, where it mixes with the secondary air supplied through the secondary air mixing port 26 and is further incinerated at high temperatures. The secondary air contains alkali powder, which directly reacts with the phosphorus oxides generated from the incineration of organophosphorus waste at high temperatures to form phosphates / pyrophosphates.

[0073] To ensure complete combustion, combustion chamber 2 needs to be preheated. The preheating process is as follows: fuel oil is supplied through the combustion nozzle 211 pipeline and ignited using igniter 212, thus igniting the fuel oil injected through the combustion nozzle 211. The combustion of fuel oil preheats the furnace temperature of the main furnace 22 to 850°C. Once the temperature of the main furnace 22 stabilizes at 850°C, the alkali powder valve 28 is opened, and alkali powder falls into the venturi 29, where it is carried by secondary air and introduced into combustion chamber 2. Subsequently, the feed pipeline is switched, and liquid feed is injected through the combustion nozzle 211 for combustion and phosphorus fixation treatment.

[0074] The high-temperature flue gas filtration device 3 includes a settling chamber 31 and a cyclone dust collector 32.

[0075] Below the combustion chamber 2 is a settling chamber 31, where a large amount of phosphate produced by phosphorus fixation during combustion is directly deposited. The interface between the settling chamber 31 and the combustion chamber has a constriction made of refractory brick, where the phosphate produced by combustion mainly collides with radioactive dust, thus removing phosphate while carrying away some radioactive dust. The outlet of the settling chamber 31 is connected to a cyclone dust collector 32, which uses the centrifugal force generated by the rotation of the dust-laden airflow to further separate the salt and radioactive dust.

[0076] Those skilled in the art should understand that the method described in this invention is not limited to the embodiments shown in the specific implementation details. The above detailed description is merely for illustrative purposes and is not intended to limit the invention. Other implementation methods derived by those skilled in the art based on the technical solution of this invention also fall within the scope of this invention's technical innovation. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. A front-end phosphorus fixation incineration method for treating radioactive organophosphorus waste liquid, comprising the following steps: (1) Treatment of organophosphorus waste liquid: Radioactive organophosphorus waste liquid is treated to obtain a liquid that meets the requirements for transportation and incineration calorific value; (2) Incineration and phosphorus fixation of the liquid feed: The liquid feed is incinerated and phosphorus fixation is performed in the combustion chamber, specifically including: (2.1) Liquid combustion: Liquid is injected into the small furnace through the combustion nozzle, and is initially mixed and burned with primary air, and then enters the main furnace for further high-temperature combustion; (2.2) The front-end phosphorus fixation method is to add alkali powder or alkali solution for phosphorus fixation; (2.3) Front-end alkali powder fixation of phosphorus: Alkali powder is added to the secondary air and enters the combustion furnace with the secondary air. The alkali powder directly reacts with the phosphorus oxides generated by combustion at high temperature to generate phosphate / pyrophosphate. (2.4) Front-end alkaline solution for phosphorus fixation: Alkaline solution is sprayed into the incinerator through an alkaline solution nozzle. The alkaline solution directly reacts with the phosphorus oxides generated during incineration at high temperature to produce phosphate / pyrophosphate. (2.5) The operation process of the combustion chamber is as follows: the furnace temperature of the combustion chamber is preheated to 850°C by burning fuel oil; then alkali powder or alkali solution is introduced into the combustion chamber, and then the feed pipeline is switched so that the combustion nozzle sprays the liquid material to burn the liquid material. (3) High-temperature flue gas filtration: The dust-laden flue gas flowing out of the combustion chamber is filtered through a settling chamber and a cyclone filter.

2. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 1, characterized in that, Step (1) includes: (1.1) Mixing and viscosity adjustment: The viscosity and overall calorific value of the liquid are adjusted by adding kerosene to the radioactive organophosphorus waste liquid; (1.2) Liquid filtration: The particulate matter in the liquid is filtered through a liquid filter.

3. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 1, characterized in that, In step (2), fuel oil is injected during the preheating stage using the same combustion nozzle, while liquid feed is injected during the liquid feed combustion stage. A valve is provided to switch between the two liquid feeds.

4. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 1, characterized in that, In step (2), the combustion nozzle is a dual-flow atomizing nozzle; the combustion chamber is a vertical refractory furnace structure furnace, and the furnace body of the combustion chamber consists of refractory material, heat insulation material and steel shell from the inside to the outside, which can withstand long-term use at 1300℃.

5. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 1, characterized in that, In step (2), the alkali powder is lime powder, which is stored in an alkali powder storage tank located above the secondary air duct. It enters the secondary air duct by gravity, and the alkali powder is fully carried by the secondary air through the Venturi structure. The alkali solution is a sodium carbonate solution, which is sprayed into the combustion chamber through a pipeline with a water-cooled jacket.

6. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 1, characterized in that, Step (3) includes: (3.1) Smoke settling: The flue gas produced by incineration contains a large amount of phosphate. In the settling chamber, the large particles of phosphate / pyrophosphate are settled by reducing the flue gas velocity, and other radioactive dust is carried in the process. (3.2) Cyclone dust removal: After settling, the dust-laden flue gas passes through a cyclone dust collector, where the centrifugal force generated by the rotation of the dust-laden airflow is used to further separate the salt and radioactive dust.

7. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 6, characterized in that, In step (3), the settling chamber is located below the combustion chamber to prevent the deposition of soot in the combustion chamber.

8. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 7, characterized in that, In step (3), a narrow opening is provided at the entrance of the settling chamber, so that the salt particles can fully collide with the radioactive dust at this point, further improving the carrying capacity of the salt particles for the radioactive dust.

9. The front-end phosphorus fixation and incineration method for treating radioactive organophosphorus waste liquid as described in claim 8, characterized in that, In step (3), the settling chamber and cyclone dust collector are equipped with a heat insulation layer to ensure that the temperature of the outer surface of the equipment is below 60°C.

10. A front-end phosphorus fixation incineration system for treating radioactive organophosphorus waste liquid, comprising a batching station (1), a combustion chamber (2), and a high-temperature flue gas filtration device (3), characterized in that: The batching station (1) includes a liquid mixing tank (11), a liquid filtration and separation device (12), a liquid buffer tank (13), and a conveying pump (14). Radioactive organophosphorus waste liquid and kerosene are added to the liquid mixing tank (11) in proportion by a metering pump to prepare a liquid with a viscosity that meets the conveying requirements and a calorific value that meets the combustion requirements. Since the radioactive organophosphorus waste liquid contains a large number of solid particles, the prepared liquid is filtered by the liquid filtration and separation device (12). After filtration, the liquid is stored in the liquid buffer tank (13). When the liquid is incinerated, it is sent to the combustion chamber (2) by the conveying pump (14). The combustion chamber (2) is a device that provides high-temperature combustion for flue gas and performs front-end phosphorus fixation. Its main function is to realize the combustion of fuel oil and liquid, as well as the fixation of phosphorus by alkali powder / alkali solution. The combustion chamber (2) is a vertical refractory furnace structure, including a small furnace (21), a main furnace (22), refractory material (23), insulation material (24), a steel shell (25), a secondary air mixing inlet (26), an alkali powder storage tank (27), an alkali powder valve (28), and a venturi (29). From the inside out, the combustion chamber (2) consists of refractory material (23), insulation material (24), and a steel shell (25). The small furnace (21) includes a combustion nozzle (211), an igniter (212), and a primary air mixing inlet (213). The main furnace (22) is located inside the combustion chamber (2), where the material is fully combusted in a high-temperature environment of 850-1100℃ and with excess air. The flue gas residence time is not less than 2 seconds; the alkali powder storage tank (27) is located above the secondary air mixing port (26), and the alkali powder valve (28) is located between the alkali powder storage tank (27) and the secondary air mixing port (26). After the alkali powder valve (28) is opened, the alkali powder falls into the venturi (29) by gravity; the secondary air mixing port (26) is connected from the outside of the combustion chamber (2) to the main furnace (22) to supply secondary air to the main furnace (22); a venturi (29) is provided in the pipeline so that the alkali powder is fully mixed into the secondary air; the combustion nozzle (211) uses compressed air to atomize fuel oil or liquid feed to ensure complete combustion; the feed of the combustion nozzle (211) is controlled by a valve and can be switched between fuel oil and liquid feed.

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