Yellow phosphorus furnace gas treatment system

Abstract

The utility model discloses a yellow phosphorus furnace gas treatment system which comprises a heating device, a mixing device, a filtering device and a condensing device, wherein a hot gas outlet of the heating device is connected with the mixing device; the mixing device is used for mixing yellow phosphorus furnace gas and hot gas and outputting mixed gas; the filtering device is used for carrying out dust removal treatment on the mixed gas and outputting clean gas; the condensing device is used for condensing the clean gas and outputting non-condensable tail gas; and a cold gas inlet of the mixing device is connected with the gas flowing pipeline behind the filtering device. The heating device is used for heating the dedusted clean gas or non-condensable tail gas, the yellow phosphorus furnace gas is heated by the heated hot gas in a mixing manner, and the dedusted clean gas or non-condensable tail gas hardly contains dust, so that the heating device is not abraded, the heating efficiency can be obviously improved, and the yellow phosphorus furnace gas is heated by the heated hot gas in a mixing manner. Therefore, the service life of the heating device can be obviously prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of yellow phosphorus production, in particular to a yellow phosphorus furnace gas treatment system. Background Art

[0002] Yellow phosphorus furnace gas refers to the furnace gas produced in the yellow phosphorus production process, which mainly contains phosphorus vapor, CO, H2, N2, CO2, O2, SO2 and dust. The traditional phosphorus recovery process is the direct condensation recovery method, and its main process is to directly send the 130-170℃ furnace gas from the yellow phosphorus electric furnace into the spray tower, cool it to 35-40℃ in the spray tower, so that the yellow phosphorus vapor is transformed from gas phase to liquid phase.

[0003] During the condensation and washing process of the spray tower, yellow phosphorus and most of the dust (dust content is 50-150g / Nm 3 ) are washed off at the same time. Therefore, the liquid-solid mixture in the phosphorus collection tank needs to go through multiple stages of phosphorus collection and washing to obtain the yellow phosphorus product. This process will form a large amount of mud phosphorus. Mud phosphorus is a hazardous waste. So far, mud phosphorus treatment has always been the most difficult task for yellow phosphorus enterprises. The generation of mud phosphorus not only pollutes the environment, but also reduces the production efficiency of yellow phosphorus enterprises.

[0004] Chinese utility model patent CN211896044U discloses a circulation device for spraying yellow phosphorus furnace gas and a yellow phosphorus furnace gas condensation system, which sequentially heats, dry-dusts and sprays the yellow phosphorus furnace gas, prevents the yellow phosphorus vapor from condensing before spraying by heating, removes dust before spraying, and significantly improves the purity of the sprayed yellow phosphorus. However, directly heating the yellow phosphorus furnace gas causes serious wear of the heating device. Utility Model Content

[0005] The main purpose of the utility model is to provide a yellow phosphorus furnace gas treatment system to solve the technical problem of serious wear of the heating device in the prior art.

[0006] In order to achieve the above purpose, the utility model provides a yellow phosphorus furnace gas treatment system, the technical scheme is as follows:

[0007] A yellow phosphorus furnace gas treatment system comprises a heating device, a mixing device, a filtering device and a condensing device; wherein the hot gas outlet of the heating device is connected to the mixing device; the mixing device mixes the yellow phosphorus furnace gas and the hot gas and outputs the mixed gas; the filtering device performs dust removal on the mixed gas and outputs clean gas; the condensing device condenses the clean gas and outputs non-condensable tail gas; and the cold gas inlet of the mixing device is connected to the gas flow pipeline after the filtering device.

[0008] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: it also includes a buffer tank arranged between the mixing device and the filtering device.

[0009] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: a first valve is provided between the yellow phosphorus electric furnace and the condensing device, and a second valve is provided between the yellow phosphorus electric furnace and the mixing device.

[0010] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model, it also includes a desulfurization device for desulfurizing the non-condensable tail gas and outputting the desulfurized tail gas.

[0011] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: the cold gas inlet of the mixing device is connected to the clean gas flow pipeline, the non-condensable tail gas flow pipeline or the desulfurized tail gas flow pipeline.

[0012] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: a first induced draft fan is provided on the clean gas flow duct; or a second induced draft fan is provided on the non-condensable tail gas flow duct; or a third induced draft fan is provided on the desulfurized tail gas flow duct.

[0013] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: a third valve and a first flow indicating regulating instrument are provided between the first induced draft fan and the condensing device, and a fourth valve and a second flow indicating regulating instrument are provided between the first induced draft fan and the heating device.

[0014] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: a fifth valve and a third flow indicating regulating instrument are provided between the second induced draft fan and the desulfurization device, and a sixth valve and a fourth flow indicating regulating instrument are provided between the second induced draft fan and the heating device.

[0015] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: it also includes a vacuum pump connected to the desulfurization tail gas outlet of the desulfurization device, a seventh valve and a fifth flow indicating and regulating instrument are provided between the third induced draft fan and the vacuum pump, and an eighth valve and a sixth flow indicating and regulating instrument are provided between the third induced draft fan and the heating device.

[0016] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: the heating device is an electric heater.

[0017] As a further improvement of the yellow phosphorus furnace gas treatment system of the utility model: the filtering device includes a cyclone dust collector and a metal film dust collector connected in sequence.

[0018] The advantages of the yellow phosphorus furnace gas treatment system of the utility model are as follows: the heating device of the utility model heats the clean gas or non-condensable tail gas after dust removal, and the heated hot gas heats the yellow phosphorus furnace gas by mixing. Since the clean gas or non-condensable tail gas after dust removal contains almost no dust, the heating device will not be worn, and the heating efficiency can be significantly improved, thereby significantly improving the service life of the heating device. The yellow phosphorus furnace gas treatment system of the utility model has a simple structure, small changes to the existing system, low transformation cost, and strong practicality.

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present invention are used to assist the understanding of the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of Example 1 of the utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of Example 2 of the utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of Example 3 of the utility model.

[0025] The relevant marks in the above drawings are:

[0026] 100-yellow phosphorus electric furnace, 110-first valve, 120-second valve, 130-third valve, 140-fourth valve, 150-fifth valve, 160-sixth valve, 170-seventh valve, 180-eighth valve, 200-heating device, 300-mixing device, 310-buffer tank, 410-cyclone dust collector, 420-metal film dust collector, 500-condensing device, 600-desulfurization device, 700-vacuum pump, 810-first induced draft fan, 820-second induced draft fan, 830-third induced draft fan, 910-first flow indicating and regulating instrument, 920-second flow indicating and regulating instrument, 930-third flow indicating and regulating instrument, 940-fourth flow indicating and regulating instrument, 950-fifth flow indicating and regulating instrument, 960-sixth flow indicating and regulating instrument. DETAILED DESCRIPTION

[0027] The utility model is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly noted that:

[0028] The technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other if there is no conflict.

[0029] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] About the terms and units in the present invention: The terms "include", "have" and any variations thereof in the specification and claims of the present invention and related parts are intended to cover non-exclusive inclusions.

[0031] Example 1

[0032] Figure 1 Schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of this embodiment.

[0033] like Figure 1 As shown, the yellow phosphorus furnace gas treatment system includes a heating device 200, a mixing device 300, a filtering device, a condensing device 500, a desulfurization device 600 and a vacuum pump 700.

[0034] The hot gas outlet of the heating device 200 is connected to the mixing device 300; the heating device 200 is an electric heater.

[0035] The mixing device 300 mixes the yellow phosphorus furnace gas and the hot gas and outputs the mixed gas. The yellow phosphorus furnace gas is generated by the reaction of phosphate ore in the yellow phosphorus electric furnace 100.

[0036] The buffer tank 310 between the mixing device 300 and the filtering device is used for the mixed gas to be buffered in the buffer tank 310 before flowing into the filtering device, which helps to stabilize the gas pressure of the system.

[0037] The filtering device performs dust removal on the mixed gas and outputs clean gas.

[0038] The condensing device 500 condenses the clean gas and outputs non-condensable tail gas; the condensing device 500 is preferably, but not limited to, a spray tower.

[0039] The desulfurization device 600 is used to desulfurize the non-condensable tail gas. The desulfurization device 600 can be any one of a wet desulfurization device 600, a dry desulfurization device 600, and a semi-dry desulfurization device 600.

[0040] The vacuum pump 700 is connected to the desulfurized tail gas outlet of the desulfurization device 600 and is used to send the desulfurized tail gas to a downstream section. The downstream section may be, but is not limited to, recovering CO in the desulfurized tail gas.

[0041] A first valve 110 is provided between the yellow phosphorus furnace 100 and the condensing device 500, and a second valve 120 is provided between the yellow phosphorus furnace 100 and the mixing device 300. The first valve 110 is used as a backup branch and can be activated when a failure occurs in the flow path where the second valve 120 is located or when the system is debugged.

[0042] In this embodiment, the cold gas inlet of the mixing device 300 is connected to the gas flow pipeline after the filtering device. Specifically, the cold gas inlet of the mixing device 300 is connected to the clean gas flow pipeline, and a first induced draft fan 810 is provided on the clean gas flow pipeline. A third valve 130 and a first flow indicating regulating instrument 910 are provided between the first induced draft fan 810 and the condensing device 500, and a fourth valve 140 and a second flow indicating regulating instrument 920 are provided between the first induced draft fan 810 and the heating device 200. In this way, the gas flow of the clean gas diverted into the condensing device 500 and the heating device 200 can be adjusted, which helps to maintain the system pressure stability.

[0043] The filtering device includes a cyclone dust collector 410 and a metal film dust collector 420 connected in sequence, and combines gravity dust removal with precision dust removal, so that a better dust removal effect can be achieved with lower energy consumption. The filter element of the metal film dust collector 420 is preferably, but not limited to, made of sintered metal porous film material.

[0044] Example 2

[0045] Figure 2 Schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of this embodiment.

[0046] Compared with Example 1, the yellow phosphorus furnace gas treatment system of this embodiment has the following differences: Figure 2As shown, the cold gas inlet of the mixing device 300 is connected to the non-condensable tail gas flow pipeline, a second induced draft fan 820 is provided on the non-condensable tail gas flow pipeline, a fifth valve 150 and a third flow indicating regulating instrument 930 are provided between the second induced draft fan 820 and the desulfurization device 600, and a sixth valve 160 and a fourth flow indicating regulating instrument 940 are provided between the second induced draft fan 820 and the heating device 200. In this way, the gas flow of the non-condensable tail gas diverted into the desulfurization device 600 and the heating device 200 can be adjusted, which helps to maintain the system pressure stability.

[0047] Example 3

[0048] Figure 3 Schematic diagram of the structure of the yellow phosphorus furnace gas treatment system of this embodiment.

[0049] Compared with Example 1, the yellow phosphorus furnace gas treatment system of this embodiment has the following differences: Figure 3 As shown, the cold gas inlet of the mixing device 300 is connected to the desulfurized tail gas flow pipeline, a third induced draft fan 830 is provided on the desulfurized tail gas flow pipeline, a seventh valve 170 and a fifth flow indicating regulating instrument 950 are provided between the third induced draft fan 830 and the vacuum pump 700, and an eighth valve 180 and a sixth flow indicating regulating instrument 960 are provided between the third induced draft fan 830 and the heating device 200. In this way, the gas flow of the desulfurized tail gas diverted into the vacuum pump 700 and the heating device 200 can be adjusted, which helps to maintain the system pressure stability.

[0050] The above is an explanation of the relevant contents of the utility model. A person skilled in the art will be able to implement the utility model based on these explanations. Based on the above contents of the utility model, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the utility model.

Claims

1. Yellow phosphorus furnace gas treatment system, characterized by: It comprises a heating device (200), a mixing device (300), a filtering device and a condensing device (500); wherein: The hot gas outlet of the heating device (200) is connected to the mixing device (300); The mixing device (300) mixes the yellow phosphorus furnace gas and the hot gas and outputs the mixed gas; The filtering device performs dust removal on the mixed gas and outputs clean gas; The condensing device (500) condenses the clean gas and outputs non-condensable tail gas; The cold gas inlet of the mixing device (300) is connected to the gas flow pipeline after the filtering device.

2. The yellow phosphorus furnace gas treatment system according to claim 1, characterized in that: It also includes a buffer tank (310) disposed between the mixing device (300) and the filtering device.

3. The yellow phosphorus furnace gas treatment system according to claim 1, characterized in that: A first valve (110) is provided between the yellow phosphorus electric furnace (100) and the condensing device (500), and a second valve (120) is provided between the yellow phosphorus electric furnace (100) and the mixing device (300).

4. The yellow phosphorus furnace gas treatment system according to claim 1, characterized in that: It also includes a desulfurization device (600) for desulfurizing the non-condensable tail gas and outputting the desulfurized tail gas.

5. The yellow phosphorus furnace gas treatment system according to claim 4, characterized in that: The cold gas inlet of the mixing device (300) is connected to a clean gas flow pipeline, a non-condensable tail gas flow pipeline, or a desulfurized tail gas flow pipeline.

6. The yellow phosphorus furnace gas treatment system according to claim 1, characterized in that: A first induced draft fan (810) is provided on the clean gas flow pipeline; or a second induced draft fan (820) is provided on the non-condensable tail gas flow pipeline; or a third induced draft fan (830) is provided on the desulfurized tail gas flow pipeline.

7. The yellow phosphorus furnace gas treatment system according to claim 6, characterized in that: A third valve (130) and a first flow indicating regulating instrument (910) are provided between the first induced draft fan (810) and the condensing device (500), and a fourth valve (140) and a second flow indicating regulating instrument (920) are provided between the first induced draft fan (810) and the heating device (200).

8. The yellow phosphorus furnace gas treatment system according to claim 6, characterized in that: A fifth valve (150) and a third flow indicating regulating instrument (930) are provided between the second induced draft fan (820) and the desulfurization device (600), and a sixth valve (160) and a fourth flow indicating regulating instrument (940) are provided between the second induced draft fan (820) and the heating device (200).

9. The yellow phosphorus furnace gas treatment system according to claim 6, characterized in that: The invention also includes a vacuum pump (700) connected to the desulfurized tail gas outlet of the desulfurization device (600), a seventh valve (170) and a fifth flow indicating and regulating instrument (950) are provided between the third induced draft fan (830) and the vacuum pump (700), and an eighth valve (180) and a sixth flow indicating and regulating instrument (960) are provided between the third induced draft fan (830) and the heating device (200).

10. The yellow phosphorus furnace gas treatment system according to claim 1, characterized in that: The heating device (200) is an electric heater; the filtering device comprises a cyclone dust collector (410) and a metal film dust collector (420) which are connected in sequence.

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