Phosphorus-coal co-production pressurized gasification furnace gas treatment equipment

Abstract

The utility model discloses phosphorus - coal co-production pressurized gasification furnace furnace gas treatment equipment is applicable to the recovery yellow phosphorus from phosphorus - coal co-production pressurized gasification furnace furnace gas and produces CO product. Including: primary waste heat recovery device is used to carry out primary waste heat recovery treatment to phosphorus - coal co-production pressurized gasification furnace output furnace gas, and exports primary waste heat recovery after flue gas, mechanical dust collector is used to carry out mechanical dust removal treatment to primary waste heat recovery after flue gas, and exports mechanical dust removal after flue gas, secondary waste heat recovery device is used to carry out secondary waste heat recovery treatment to mechanical dust removal after flue gas, and exports secondary waste heat recovery after flue gas, flue gas filter dust remover is used to carry out filtration dust removal treatment to secondary waste heat recovery after flue gas, and exports filtration dust removal after flue gas, flue gas condensation and collect phosphorus treatment is used to carry out condensation to filtration dust removal after flue gas to make the yellow phosphorus in filtration dust removal after flue gas separate out, and the yellow phosphorus that separates out is recovered, and exports condensation and collect phosphorus after flue gas, and the tail gas purification treatment device of excess pressure power generation device.

Description

Technical Field

[0001] This utility model relates to the field of phosphorus-coal cogeneration technology, specifically to a gas treatment device for a pressurized gasifier in phosphorus-coal cogeneration. Background Technology

[0002] The phosphate-coal co-production pressurized gasifier is an innovative reaction device that revolutionizes the traditional electric arc furnace method for producing yellow phosphorus. Its core principle lies in coupling the efficient gasification of coal with the reduction reaction of phosphate rock within a single, closed pressurized system. Inside the phosphate-coal co-production pressurized gasifier, powdered coal, phosphate rock, and flux react with gasifying agents (such as oxygen and steam) under high pressure. The coal first gasifies at high temperature, generating a large amount of heat energy and a highly reducing gas rich in carbon monoxide. Then, this high-temperature gas and heat directly act as a reducing agent and energy source, reducing the phosphate rock (mainly composed of phosphorus pentoxide) in situ into gaseous yellow phosphorus (P4 vapor). Therefore, this process not only replaces expensive electricity with lower-cost coal but also integrates the co-production of yellow phosphorus vapor and a large amount of high-value-added CO syngas. The entire process is carried out under pressure, resulting in exhaust gas with high pressure energy, creating conditions for subsequent energy recovery and utilization.

[0003] Currently, there is a lack of furnace gas treatment equipment suitable for recovering yellow phosphorus from the furnace gas of a pressurized gasifier for phosphorus-coal co-production and producing CO products. Summary of the Invention

[0004] The purpose of this invention is to provide a gas treatment device for a pressurized gasifier used in a phosphorus-coal co-production process, which is suitable for recovering yellow phosphorus from the gas of the pressurized gasifier and producing CO products.

[0005] A flue gas treatment system for a pressurized gasifier producing phosphorus and coal co-production includes: a primary waste heat recovery device for treating the flue gas output from the pressurized gasifier to recover primary waste heat, and outputting flue gas after primary waste heat recovery; a mechanical dust collector for treating the flue gas after primary waste heat recovery to remove dust, and outputting flue gas after mechanical dust removal; a secondary waste heat recovery device for treating the flue gas after mechanical dust removal to recover secondary waste heat, and outputting flue gas after secondary waste heat recovery; and a flue gas filter dust collector for treating the flue gas after secondary waste heat recovery to remove dust, and outputting flue gas after filter dust removal. The system includes a condensation and phosphorus recovery treatment, used to condense the filtered and dust-removed flue gas to precipitate yellow phosphorus, recover the precipitated yellow phosphorus, and output the condensed and phosphorus-removed flue gas; a waste pressure power generation device, used to generate electricity using the condensed and phosphorus-removed flue gas, and output the waste pressure power generation tail gas; and a tail gas purification treatment device, used to purify the waste pressure power generation tail gas and output carbon monoxide product; wherein the primary waste heat recovery treatment, the mechanical dust removal treatment, the secondary waste heat recovery treatment, and the filtration and dust removal treatment all occur above the yellow phosphorus dew point temperature.

[0006] As an optimization and / or instantiation of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: the mechanical dust collector includes a gravity dust collector and / or a cyclone dust collector.

[0007] As an optimization and / or instance of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: the flue gas filter dust collector is a flue gas filter dust collector using metal filter elements.

[0008] As an optimization and / or instance of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal co-production, further: the dust content in the filtered and dust-removed flue gas output by the flue gas filter dust collector is ≤10mg / Nm³. 3 .

[0009] As an optimization and / or instance of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal co-production, the flue gas condensation and phosphorus collection treatment further includes: a phosphorus collection tower, used to condense the filtered and dust-removed flue gas using water washing or refrigerant, so that yellow phosphorus condenses and precipitates; and a phosphorus collection tank, used to collect and precipitate the condensed yellow phosphorus.

[0010] As an optimization and / or instantiation of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: an alkaline scrubbing tower is connected in series between the phosphorus collection tower and the residual pressure power generation device.

[0011] As an optimization and / or instance of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal co-production, further: the carbon monoxide product output by the tail gas purification treatment device meets the technical requirements for use as a raw material for C1 chemicals.

[0012] As an optimization and / or instance of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: the primary waste heat recovery device and / or the secondary waste heat recovery device adopt waste heat boilers.

[0013] As an optimization and / or instantiation of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: the shell of the waste heat boiler used in the primary waste heat recovery device is connected to the shell of the waste heat boiler used in the secondary waste heat recovery device as a whole.

[0014] As an optimization and / or instantiation of the above-mentioned pressurized gasification furnace gas treatment equipment for phosphorus-coal cogeneration, further: the water vapor generated by the evaporator in the waste heat boiler of the secondary waste heat recovery device and the water vapor generated by the evaporator in the waste heat boiler of the primary waste heat recovery device are both superheated by the superheater in the waste heat boiler of the primary waste heat recovery device and then output.

[0015] The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal provides this invention sequentially performs primary waste heat recovery, mechanical dust removal, secondary waste heat recovery, and filtration dust removal above the yellow phosphorus dew point temperature. This ensures thorough waste heat recovery and dust removal before yellow phosphorus precipitation, achieving not only efficient utilization of the gas heat from the pressurized gasifier but also, through the use of a phosphorus collection tower and collection tank for flue gas condensation and phosphorus collection after filtration and dust removal, relatively pure yellow phosphorus is obtained, significantly reducing the mud phosphorus generated during flue gas condensation and phosphorus collection. Furthermore, by integrating a waste pressure power generation device to recover and utilize the pressure energy of the condensed and phosphorus-collected flue gas, and finally outputting carbon monoxide as a product through a tail gas purification treatment device, the rational use of the gas pressure in the pressurized gasifier for co-production of phosphorus and coal is further realized. This equipment offers significant advantages such as energy cascade utilization, equipment integration, and environmental emission reduction.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the pressurized gas treatment equipment for the phosphorus-coal cogeneration pressurized gasifier according to an embodiment of this application.

[0018] Figure 2 for Figure 1 A schematic diagram of the structure for flue gas condensation and phosphorus recovery treatment.

[0019] The components are labeled as follows: 1. Primary waste heat recovery device; 2. Mechanical dust collector; 3. Secondary waste heat recovery device; 4. Furnace gas filtration dust collector; 5. Furnace gas condensation and phosphorus collection treatment device; 6. Phosphorus collection tower; 7. Phosphorus collection tank; 8. Residual pressure power generation device; 9. Tail gas purification treatment device. Detailed Implementation

[0020] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that: The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0021] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0022] The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0023] like Figure 1 As shown, this embodiment provides a gas treatment device for a pressurized gasifier for co-production of phosphorus and coal, including a primary waste heat recovery device 1, a mechanical dust collector 2, a secondary waste heat recovery device 3, a flue gas filter dust collector 4, a flue gas condensation and phosphorus collection treatment device 5, a waste pressure power generation device 6, and a tail gas purification treatment device 7, which are connected in series along the treatment process.

[0024] The primary waste heat recovery device 1 is used to perform primary waste heat recovery treatment on the high-temperature furnace gas output from the phosphorus-coal co-production pressurized gasifier 8, and outputs flue gas after primary waste heat recovery. In this embodiment, the primary waste heat recovery device 1 adopts a waste heat boiler, which has a superheater, an evaporator, and an economizer. Since the furnace gas output from the phosphorus-coal co-production pressurized gasifier 8 has a furnace gas temperature as high as 1200℃-1500℃ and contains a large amount of sensible heat, the primary waste heat recovery device 1 can reduce the furnace gas temperature to 800℃-900℃, while generating high-pressure superheated steam, which can be used for power generation.

[0025] Mechanical dust collector 2 is used to mechanically remove dust from the flue gas after primary waste heat recovery and outputs the mechanically dust-removed flue gas. In this embodiment, mechanical dust collector 2 includes a cyclone dust collector, which uses the principle of centrifugal force to remove larger dust particles from the flue gas. The cyclone dust collector can achieve a removal efficiency of over 90% for particles with a diameter of 50 micrometers or larger, effectively reducing the load on subsequent dust removal equipment.

[0026] The secondary waste heat recovery device 3 is used to perform secondary waste heat recovery treatment on the flue gas after mechanical dust removal and output the flue gas after secondary waste heat recovery. In this embodiment, the secondary waste heat recovery device 3 also adopts a waste heat boiler to further reduce the temperature of the flue gas after mechanical dust removal from 800℃-900℃ to 300℃-500℃. In order to save equipment investment, the shell of the waste heat boiler used in the secondary waste heat recovery device 3 is connected to the shell of the waste heat boiler used in the primary waste heat recovery device 1, forming an integrated waste heat boiler system. In addition, the water vapor generated by the evaporator in the waste heat boiler used in the secondary waste heat recovery device 3 and the water vapor generated by the evaporator in the waste heat boiler used in the primary waste heat recovery device 1 are superheated together through the superheater in the waste heat boiler used in the primary waste heat recovery device 1 before being output, realizing the integration of the water vapor system.

[0027] The flue gas filter dust collector 4 is used to filter and remove dust from the flue gas after secondary waste heat recovery, and outputs filtered and dust-removed flue gas. In this embodiment, the flue gas filter dust collector 4 uses metal filter elements, which can operate stably under high temperature conditions (300℃-500℃) and has high dust removal efficiency. The dust content in the filtered and dust-removed flue gas output by the flue gas filter dust collector 4 is ≤10mg / Nm³, meeting the purity requirements for subsequent yellow phosphorus condensation and recovery.

[0028] The flue gas condensation and phosphorus recovery device 5 is used to condense the filtered and dust-removed flue gas to precipitate yellow phosphorus, recover the precipitated yellow phosphorus, and output the condensed and phosphorus-recovered flue gas. Figure 2 As shown, in this embodiment, the flue gas condensation and phosphorus collection device 5 includes a phosphorus collection tower 51 and a phosphorus collection tank 52. The phosphorus collection tower 51 uses water washing to condense the filtered and dust-removed flue gas, causing yellow phosphorus to condense and precipitate. When the water washing cools to 50-60°C, the gaseous yellow phosphorus rapidly condenses into a liquid state, forming yellow phosphorus droplets in the water. The phosphorus collection tank 52 is used to collect and precipitate the condensed yellow phosphorus. Because the density of yellow phosphorus is greater than that of water, the yellow phosphorus droplets settle to the bottom of the phosphorus collection tank 52, achieving separation from the water, facilitating subsequent extraction and utilization.

[0029] In this embodiment, an alkaline scrubbing tower 53 is connected in series between the phosphorus collection tower 51 and the residual pressure power generation device 6 to remove residual acidic substances in the flue gas and protect downstream equipment. The alkaline scrubbing tower 53 uses sodium hydroxide solution as the scrubbing liquid to absorb and neutralize acidic gases (such as H2S, COS, etc.) in the flue gas.

[0030] The waste pressure power generation device 6 is used to generate electricity from the condensed and phosphorus-recovered flue gas, and outputs the exhaust gas after waste pressure power generation. In this embodiment, the waste pressure power generation device 6 adopts a turbine generator set, which uses the pressure energy (typically 1.5MPa-2.5MPa) of the condensed and phosphorus-recovered flue gas to drive the turbine to rotate and generate electricity. The outlet pressure of the turbine is approximately atmospheric pressure, realizing the efficient conversion of pressure energy into electrical energy.

[0031] The exhaust gas purification device 7 is used to purify the exhaust gas after waste pressure power generation and output carbon monoxide as a product. In this embodiment, the exhaust gas purification device 7 includes a desulfurization unit and a low-temperature methanol washing unit, used to remove impurities such as sulfides and carbon dioxide from the exhaust gas after waste pressure power generation and purify carbon monoxide. After purification, the purity of the output carbon monoxide product meets the technical requirements for use as a raw material in C1 chemicals and can be used to produce high value-added chemical products such as methanol and acetic acid.

[0032] It is important to note that in this embodiment, the entire process of primary waste heat recovery, mechanical dust removal, secondary waste heat recovery, and filtration dust removal all occurs above the yellow phosphorus dew point. This design aims to prevent premature condensation of yellow phosphorus in high-temperature pipelines and equipment, which could lead to equipment blockage and ensure long-term stable operation of the system. Only after the flue gas has undergone sufficient dust removal treatment is the yellow phosphorus condensed and precipitated in a controlled manner in the phosphorus collection tower 51. This not only improves the purity of the recovered yellow phosphorus but also extends the service life of the equipment.

[0033] The working process of this embodiment is as follows: The high-temperature furnace gas (1200-1500℃) generated by the phosphorus-coal cogeneration pressurized gasifier 8 first enters the primary waste heat recovery device 1 for heat recovery. After the temperature drops to 800℃-900℃, it enters the mechanical dust collector 2 for preliminary dust removal. The flue gas after mechanical dust removal then enters the secondary waste heat recovery device 3 for further heat recovery. After the temperature drops to 300℃-500℃, it enters the flue gas filter dust collector 4 for fine dust removal. The flue gas after filtration and dust removal (dust content ≤10mg / Nm³) 3 The flue gas enters the phosphorus collection tower 51, where it is washed and condensed by water to precipitate yellow phosphorus and collect it in the phosphorus collection tank 52. After condensation, the flue gas is treated by the alkaline washing tower 53 and then enters the residual pressure power generation device 6 to generate electricity. Finally, the exhaust gas after residual pressure power generation is purified by the exhaust gas purification treatment device 7 to obtain a high-purity carbon monoxide product.

[0034] The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal provides this invention sequentially performs primary waste heat recovery, mechanical dust removal, secondary waste heat recovery, and filtration dust removal above the yellow phosphorus dew point temperature. This ensures thorough waste heat recovery and dust removal before yellow phosphorus precipitation, achieving not only efficient utilization of the gas heat from the pressurized gasifier but also, through the use of a phosphorus collection tower and collection tank for flue gas condensation and phosphorus collection after filtration and dust removal, relatively pure yellow phosphorus is obtained, significantly reducing the mud phosphorus generated during flue gas condensation and phosphorus collection. Furthermore, by integrating a waste pressure power generation device to recover and utilize the pressure energy of the condensed and phosphorus-collected flue gas, and finally outputting carbon monoxide as a product through a tail gas purification treatment device, the rational use of the gas pressure in the pressurized gasifier for co-production of phosphorus and coal is further realized. This equipment offers significant advantages such as energy cascade utilization, equipment integration, and environmental emission reduction.

[0035] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of this utility model.

Claims

1. A gas treatment system for a pressurized gasifier used in a phosphorus-coal co-production process, characterized in that: include: The primary waste heat recovery device is used to perform primary waste heat recovery treatment on the furnace gas output from the phosphorus-coal co-production pressurized gasifier, and output the flue gas after primary waste heat recovery. A mechanical dust collector is used to mechanically remove dust from the flue gas after the primary waste heat recovery and to output the mechanically dust-removed flue gas. A secondary waste heat recovery device is used to perform secondary waste heat recovery treatment on the flue gas after mechanical dust removal and output the flue gas after secondary waste heat recovery. A flue gas filter dust collector is used to filter and remove dust from the flue gas after the secondary waste heat recovery, and outputs the filtered and dust-removed flue gas. Flue gas condensation and phosphorus recovery treatment is used to condense the filtered and dust-removed flue gas to precipitate yellow phosphorus in the filtered and dust-removed flue gas, recover the precipitated yellow phosphorus, and output the condensed and phosphorus-recovered flue gas. The waste pressure power generation device is used to generate electricity using the condensed and phosphorus-recovered flue gas, and outputs the waste pressure power generation tail gas. The exhaust gas purification and treatment device is used to purify the exhaust gas after the residual pressure power generation and output carbon monoxide product. The processes of primary waste heat recovery treatment, mechanical dust removal treatment, secondary waste heat recovery treatment, and filtration dust removal treatment occur above the yellow phosphorus dew point temperature.

2. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The mechanical dust collector includes a gravity dust collector and / or a cyclone dust collector.

3. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The flue gas filter dust collector is a flue gas filter dust collector that uses metal filter elements.

4. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The dust content in the filtered flue gas output by the flue gas filter dust collector is ≤10mg / Nm³. 3 .

5. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The flue gas condensation and phosphorus recovery treatment includes: A phosphorus collection tower is used to condense the filtered and dust-removed flue gas using water washing or refrigerant, so that yellow phosphorus is condensed and precipitated. The phosphorus collection tank is used to collect and precipitate the yellow phosphorus that has condensed and precipitated.

6. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 5, characterized in that: An alkaline washing tower is connected in series between the phosphorus collection tower and the residual pressure power generation device.

7. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The carbon monoxide product output by the exhaust gas purification and treatment device meets the technical requirements for use as a raw material in C1 chemistry.

8. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 1, characterized in that: The primary waste heat recovery device and / or the secondary waste heat recovery device employ waste heat boilers.

9. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 8, characterized in that: The shell of the waste heat boiler used in the primary waste heat recovery device is connected to the shell of the waste heat boiler used in the secondary waste heat recovery device as a whole.

10. The gas treatment equipment for a pressurized gasifier used in the co-production of phosphorus and coal as described in claim 8, characterized in that: The steam generated by the evaporator in the waste heat boiler used in the secondary waste heat recovery device and the steam generated by the evaporator in the waste heat boiler used in the primary waste heat recovery device are superheated together by the superheater in the waste heat boiler used in the primary waste heat recovery device before being output.

Images