Yellow phosphorus electric furnace gas treatment equipment

Abstract

The utility model discloses a kind of yellow phosphorus electric furnace furnace gas treatment equipment, solve the technical problems of high temperature dust removal efficiency not high and the high processing cost of cooling water after use in existing yellow phosphorus electric furnace furnace gas treatment process. Including: high temperature dust removal part, spraying cooling part and cooling water circulation processing part;The high temperature dust removal part is configured to be able to make the dust content in the dust-removing gas less than 10mg / Nm 3 ;The cooling water circulation processing part includes first cooling water circulation processing route, and the first cooling water circulation processing route is used to cool the supernatant in the cooling water after use of the spraying cooling part directly through cooler and return the spraying cooling part for reuse after cooling. Avoid the technical bottleneck that must be carried out complex depth purification to all cooling water in traditional process, simplify the treatment process of phosphorus-containing wastewater, greatly reduce the energy consumption and operating cost of water treatment.

Description

Technical Field

[0001] This utility model relates to a furnace gas treatment device for yellow phosphorus electric furnaces. Background Technology

[0002] Yellow phosphorus (P4) is an important basic chemical raw material with wide applications in many fields. Its industrial production mainly adopts the pyrometallurgical process, which involves the high-temperature reduction of phosphate rock in a yellow phosphorus electric furnace. However, the pyrometallurgical production process of yellow phosphorus emits high-temperature furnace gas containing gaseous yellow phosphorus, carbon monoxide, a large amount of dust and other impurities, and generates phosphorus-containing wastewater containing harmful substances such as phosphorus, arsenic, and fluorine.

[0003] Existing yellow phosphorus electric arc furnace gas treatment processes typically include two main stages: high-temperature dust removal and spray cooling. High-temperature dust removal aims to remove solid dust from the furnace gas above the dew point temperature of yellow phosphorus; spray cooling utilizes cooling water to condense and recover gaseous yellow phosphorus. Regarding high-temperature dust removal, traditional technologies struggle to effectively capture ultrafine dust in the furnace gas, resulting in high dust content in the removed gas. This not only reduces the purity of the final yellow phosphorus product and increases the burden of subsequent refining but also generates large amounts of phosphorus sludge, leading to severe environmental pollution. As for spray cooling, the cooling water used in the spray cooling section (often called phosphorus sludge water or phosphorus-containing wastewater) contains a large amount of suspended solids, incompletely condensed trace amounts of yellow phosphorus, and other dissolved impurities. Therefore, it requires complex deep wastewater purification treatment before partially recycling. The high energy consumption and operating costs of deep wastewater purification treatment also limit the recycling rate of water resources. Utility Model Content

[0004] The purpose of this invention is to provide a gas treatment device for yellow phosphorus electric furnaces, which solves the technical problems of low high-temperature dust removal efficiency and high treatment cost of cooling water after use in the existing yellow phosphorus electric furnace gas treatment process.

[0005] A gas treatment device for a yellow phosphorus electric furnace includes: a high-temperature dust removal section for treating the furnace gas emitted from the yellow phosphorus electric furnace above the dew point temperature of yellow phosphorus, resulting in dust-removed gas; a spray cooling section for spraying and cooling the dust-removed gas with cooling water, thereby condensing and recovering the yellow phosphorus in the dust-removed gas into a phosphorus receiving tank; and a cooling water circulation section for treating the cooling water used by the spray cooling section and returning it to the spray cooling section for reuse; the high-temperature dust removal section is configured to reduce the dust content in the dust-removed gas to below 10 mg / Nm³. 3The cooling water circulation treatment section includes a first cooling water circulation treatment route, which is used to directly cool the clear liquid in the cooling water after use in the spray cooling section through a cooler and then return it to the spray cooling section for reuse.

[0006] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the high-temperature dust removal section includes a high-temperature flue gas filter dust collector, which adopts a metal flue gas filter element or a ceramic flue gas filter element.

[0007] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, the high-temperature dust removal section further includes a pre-dust collector located between the high-temperature flue gas filter and the yellow phosphorus electric furnace.

[0008] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the pre-dust collector adopts a gravity dust collector or a cyclone dust collector.

[0009] As an optimization and / or instantiation of the aforementioned yellow phosphorus electric furnace gas treatment equipment, furthermore: the dust removal efficiency of the high-temperature flue gas filter dust collector is such that the dust content in the dust-removed gas is below 5 mg / Nm³. 3 .

[0010] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the cooling water circulation treatment section includes a second cooling water circulation treatment route, which is used to purify a portion of the cooling water after use in the spray cooling section and return it to the spray cooling section for reuse.

[0011] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the first cooling water circulation treatment route and the second cooling water circulation treatment route are connected in parallel after the cooling water membrane filtration device. The cooling water membrane filtration device is used to perform membrane filtration treatment on the cooling water after the spray cooling section, and inputs the clear liquid generated by the membrane filtration treatment into the first cooling water circulation treatment route, while inputting the concentrated liquid generated by the membrane filtration treatment into the second cooling water circulation treatment route.

[0012] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the cooling water film filtration device is configured as a liquid film filtration device capable of achieving a recovery rate of ≥60% for the clarified liquid.

[0013] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the liquid membrane filtration device adopts a microfiltration device.

[0014] As an optimization and / or instantiation of the above-mentioned yellow phosphorus electric furnace gas treatment equipment, further: the microfiltration device adopts a metal liquid filter element or a ceramic liquid filter element.

[0015] The high-temperature dust removal section of this invention is configured to reduce the dust content in the removed gas to below 10 mg / Nm³. 3 This significantly reduces the amount of solid dust entering the spray cooling section at the source. This directly leads to a substantial reduction in suspended solids in the cooling water after use, fundamentally improving water quality and creating a crucial prerequisite for simplified subsequent cooling water treatment. Based on this, the cooling water circulation treatment section of this invention, particularly its first cooling water circulation treatment route, innovatively allows the purified liquid in the significantly improved cooling water to be directly cooled by a cooler and then returned to the spray cooling section for reuse. The synergistic effect of these two improvements avoids the technical bottleneck of requiring complex deep purification of all cooling water in traditional processes. As a result, it simplifies the treatment process for phosphorus-containing wastewater, significantly reduces energy consumption and operating costs in water treatment, and significantly improves the recycling rate of water resources, reducing the amount of fresh water replenishment. This effectively alleviates the operational burden of the entire cooling water circulation treatment section, demonstrating significant economic and environmental value.

[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 yellow phosphorus electric furnace gas treatment equipment according to an embodiment of the present invention.

[0018] The following are labeled in the diagram: 1. Yellow phosphorus electric furnace; 2. Pre-dust collector; 3. High-temperature flue gas filter dust collector; 4. Spray cooling tower; 5. Phosphorus receiving tank; 6. Cooling water film filter device; 7. Cooler; 8. Pump. Detailed Implementation

[0019] 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:

[0020] 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, the yellow phosphorus electric furnace gas treatment equipment of this utility model embodiment includes a high-temperature dust removal section, a spray cooling section, and a cooling water circulation treatment section. The high-temperature dust removal section includes a pre-dust collector 2 and a high-temperature flue gas filter dust collector 3; the spray cooling section includes a spray cooling tower 4 and a phosphorus receiving tank 5; the cooling water circulation treatment section includes a cooling water film filter 6, a first cooling water circulation treatment route, and a second cooling water circulation treatment route.

[0024] The high-temperature dust removal section is used to treat the furnace gas emitted from the yellow phosphorus electric furnace 1 above the dew point temperature of yellow phosphorus, resulting in dust-removed gas. The temperature of the furnace gas emitted from the yellow phosphorus electric furnace 1 is typically higher than 500°C, far exceeding the dew point temperature of yellow phosphorus (approximately 280°C). The furnace gas first enters the pre-dust collector 2 for preliminary dust removal, removing most of the coarse dust particles. In this embodiment, the pre-dust collector 2 is a cyclone dust collector, which has a simple structure, is easy to operate and maintain, and can effectively remove larger dust particles.

[0025] The furnace gas, after preliminary dust removal by the pre-dust collector 2, enters the high-temperature flue gas filter dust collector 3 for further dust removal. In this embodiment, the high-temperature flue gas filter dust collector 3 uses a metal flue gas filter element, which can efficiently capture fine dust under high-temperature conditions (>300℃). The high-temperature flue gas filter dust collector 3 is configured to reduce the dust content in the removed gas to below 5 mg / Nm³. 3 This technology is far superior to existing technologies. By achieving efficient dust removal above the yellow phosphorus dew point temperature, the problem of dust mixing with liquid yellow phosphorus to form mud phosphorus is avoided, laying the foundation for subsequent treatment.

[0026] The dust-removed gas, after being treated by the high-temperature dust removal section, enters the spray cooling section. The spray cooling section uses cooling water to spray and cool the dust-removed gas, thereby condensing and recovering the yellow phosphorus from the gas into the phosphorus receiving tank 5. The spray cooling tower 4 uses a multi-layer spray system to ensure sufficient contact between the cooling water and the hot gas, achieving effective heat exchange and yellow phosphorus condensation. Because the high-temperature dust removal section has already efficiently removed dust, the condensed yellow phosphorus has higher purity, and the quality of the yellow phosphorus collected in the phosphorus receiving tank 5 is significantly improved.

[0027] The cooling water circulation treatment section is used to treat the cooling water used by the spray cooling section and return it to the spray cooling section for reuse. In this embodiment, the cooling water circulation treatment section includes a cooling water membrane filter device 6, a first cooling water circulation treatment route, and a second cooling water circulation treatment route.

[0028] After use, the cooling water from the spray cooling section first enters the cooling water membrane filtration device 6 for membrane filtration. In this embodiment, the cooling water membrane filtration device 6 is a microfiltration device using a metal liquid filter element. This microfiltration device is configured to achieve a clarified liquid recovery rate of ≥70%, meaning at least 70% of the influent water can be recycled as clarified liquid. The clarified liquid produced by membrane filtration enters the first cooling water circulation treatment route, while the concentrated liquid enters the second cooling water circulation treatment route.

[0029] The first cooling water circulation treatment route is one of the key innovations of this invention. This route directly sends the clarified liquid produced by membrane filtration to the cooler 7 via pump 8 for cooling, and then returns it to the spray cooling section for reuse, eliminating the need for additional deep purification treatment. This design greatly simplifies the processing flow and reduces energy consumption and operating costs. Since the high-temperature dust removal section has already efficiently removed dust, the dust content in the gas entering the spray cooling section is extremely low, thus significantly reducing the impurity content in the cooling water, making this simplified treatment possible.

[0030] The second cooling water circulation treatment route is used to purify the concentrate produced by membrane filtration and then return it to the spray cooling section for reuse. Water purification includes processes such as coagulation, sedimentation, and filtration to remove impurities from the concentrate. Since only a small portion of the water requires purification, the overall treatment cost is significantly reduced.

[0031] This utility model's yellow phosphorus electric furnace gas treatment equipment solves the technical problems of low high-temperature dust removal efficiency and high cooling water treatment costs after the use of the spray cooling section in existing technologies through the synergistic effect of the high-temperature dust removal section and the cooling water circulation treatment section. The high-temperature dust removal section is configured to reduce the dust content in the removed gas to below 10 mg / Nm³. 3 It can even reach below 5 mg / Nm 3 This reduces the amount of dust entering the spray cooling section at the source. The cooling water circulation treatment section directly cools the clear liquid through the first cooling water circulation treatment route and then recycles it, simplifying the treatment process and reducing energy consumption and operating costs.

[0032] This invention also has the following advantages: it improves the purity of yellow phosphorus products and reduces the burden of subsequent refining; it reduces the amount of phosphorus mud produced and lowers the risk of environmental pollution; it improves the recycling rate of water resources and reduces the amount of fresh water to be replenished; it reduces the operating burden of related equipment in the second cooling water circulation treatment route and extends the service life of the equipment.

[0033] 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. Yellow phosphorus electric furnace gas treatment equipment, including: The high-temperature dust removal section is used to remove dust from the furnace gas emitted by the yellow phosphorus electric furnace above the dew point temperature of yellow phosphorus, so as to obtain dust-removed gas. The spray cooling section uses cooling water to spray and cool the dust-removed gas, thereby condensing and recovering the yellow phosphorus in the dust-removed gas into the phosphorus receiving tank. The cooling water circulation and treatment section is used to process the cooling water used by the spray cooling section and return it to the spray cooling section for reuse. Its features are: The high-temperature dust removal section is configured to reduce the dust content in the removed gas to below 10 mg / Nm³. 3 ; The cooling water circulation treatment section includes a first cooling water circulation treatment route, which is used to directly cool the clear liquid in the cooling water after use in the spray cooling section through a cooler and then return it to the spray cooling section for reuse.

2. The yellow phosphorus electric furnace gas treatment equipment as described in claim 1, characterized in that: The high-temperature dust removal section includes a high-temperature flue gas filter dust collector, which uses a metal flue gas filter element or a ceramic flue gas filter element.

3. The yellow phosphorus electric furnace gas treatment equipment as described in claim 2, characterized in that: The high-temperature dust removal section also includes a pre-dust collector located between the high-temperature flue gas filter and the yellow phosphorus electric furnace.

4. The yellow phosphorus electric furnace gas treatment equipment as described in claim 3, characterized in that: The pre-dust collector is either a gravity dust collector or a cyclone dust collector.

5. The yellow phosphorus electric furnace gas treatment equipment as described in claim 2, characterized in that: The dust removal efficiency of the high-temperature flue gas filter dust collector is such that the dust content in the filtered gas is below 5 mg / Nm³. 3 .

6. The yellow phosphorus electric furnace gas treatment equipment as described in any one of claims 1-5, characterized in that: The cooling water circulation treatment section includes a second cooling water circulation treatment route, which is used to purify a portion of the cooling water after use by the spray cooling section and return it to the spray cooling section for reuse.

7. The yellow phosphorus electric furnace gas treatment equipment as described in claim 6, characterized in that: The first cooling water circulation treatment route and the second cooling water circulation treatment route are connected in parallel after the cooling water membrane filtration device. The cooling water membrane filtration device is used to perform membrane filtration treatment on the cooling water after the spray cooling section, and inputs the clear liquid produced by the membrane filtration treatment into the first cooling water circulation treatment route, while inputting the concentrated liquid produced by the membrane filtration treatment into the second cooling water circulation treatment route.

8. The yellow phosphorus electric furnace gas treatment equipment as described in claim 7, characterized in that: The cooling water membrane filtration device is configured as a liquid membrane filtration device capable of achieving a recovery rate of ≥60% for the clarified liquid.

9. The yellow phosphorus electric furnace gas treatment equipment as described in claim 8, characterized in that: The liquid membrane filtration device is a microfiltration device.

10. The yellow phosphorus electric furnace gas treatment equipment as described in claim 9, characterized in that: The microfiltration device uses a metal liquid filter element or a ceramic liquid filter element.

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