A gas-liquid separator for producing melamine based on a one-step process

Abstract

The invention discloses a gas-liquid separator for producing melamine based on a one-step method, and relates to the field of chemical industry. The separator body comprises a separator body, and support legs are installed around the bottom of the separator body. A cavity is opened inside the separator body, and a heat preservation steam inlet is connected to the top of the separator body. By providing a filter layer, a gas collecting pipe, a gas distribution pipe, a gas distribution port, a collection port, a heat preservation steam inlet and a condensed water outlet, when separating gas and liquid, the gas and liquid pass through the air inlet pipe, and the gas and liquid are filtered in the filter layer under the shunting effect of the gas distribution pipe, and the gas and liquid are separated by the slow flow rate of the gas and the adsorption effect of the filter material. At the same time, by arranging multiple filter layers in the filter, the gas passes through the filter layer in a parallel form, the gas flow rate is slow, and the gas is fully in contact with the filter medium, so that the gas and liquid are separated thoroughly, and it is not easy to form secondary mist entrainment of the gas, which can effectively avoid the blockage caused by the decrease of the surface temperature of the pipeline after the gas separation.

Description

Technical Field

[0001] The invention relates to the field of chemical industry, in particular to a gas-liquid separator for producing melamine based on a one-step process. Background Art

[0002] In the production process of melamine by gas phase quenching one-step method, the reaction gas enters the urea washing tower after quenching, cooling, precipitation and separation and crystallization. In the tower, the high-temperature gas is washed and cooled by molten urea to become the "cold air" with a lower temperature required for the melamine crystallization process. Due to the large gas flow rate and fast flow rate, the gas and liquid are in direct contact for mass transfer and heat transfer, resulting in a small amount of liquid urea and uncleanly separated muddy melamine and liquid urine mixture entrained in the mist in the tower gas. These gas entrainments adhere to the inner wall due to the low wall temperature of the pipeline and equipment, which is easy to block the gas channel. In particular, when the gas enters the crystallizer, it will affect the product quality, so they must be removed to the maximum extent.

[0003] When the existing gas-liquid separators are in use, the bag-type and membrane-type methods of high-efficiency gas-liquid separation are not suitable because the separated mud blocks the filter micropores. The electrostatic collector has a high working pressure and a large gas flow, which makes the equipment cost too high. The use of mesh filters and sand filters is too small in filtering area, and the gas flow is large and the flow rate is fast, which easily causes secondary entrainment. At the same time, when the existing gas-liquid separators are separating, the gas forms a vortex in the separator, and the liquid (solid) droplets splash onto the wall of the device by gravity, gather and flow to the lower liquid outlet. The separated gas is led out from the central tube. However, this method is limited by the principle, and the degree of gas-liquid separation is limited. A small amount of mist urea and mud is still entrained in the outlet gas. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a gas-liquid separator for producing melamine based on a one-step process, so as to solve the problem that entrained gas adheres to the inner wall due to the low wall temperature of the pipeline and the equipment and easily blocks the gas channel.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a gas-liquid separator for producing melamine based on a one-step process, comprising a separator body, supporting legs are installed around the bottom of the separator body, a cavity is opened inside the separator body, a thermal insulation steam inlet is connected to the top of the separator body, a condensate outlet is connected to one side of the bottom of the separator body, a separation chamber is installed inside the cavity, a filter layer is installed inside the separation chamber, an air inlet is connected to one side of the separation chamber, an air inlet is connected to one end of the air inlet pipe, an air distribution pipe is connected to the bottom of the air distribution pipe, an air distribution port is opened, an air outlet is connected to the other side of the separation chamber, an air outlet is connected to one end of the air outlet pipe, a collecting pipe is connected to the top of the collecting pipe, a collecting port is opened, a filter material addition port is installed on the top of the filter layer, and separation liquid outlets are installed on both sides of the bottom of the separation chamber.

[0006] Preferably, seven filter layers are provided, and the seven filter layers are equidistantly distributed inside the separation chamber.

[0007] Preferably, one end of the gas distribution pipe and the other end of the gas collection pipe both penetrate the filter layer.

[0008] Preferably, three gas distribution ports are provided, and the three gas distribution ports are equidistantly distributed at the bottom of the gas distribution pipe.

[0009] Preferably, three collecting ports are provided, and the three collecting ports are equidistantly distributed on the top of the gas collecting pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a filter layer, an air collecting pipe, an air distribution pipe, an air distribution port, a collecting port, an insulation steam inlet and a condensate outlet, when separating the gas and the liquid, the staff first allows the gas and the liquid to pass through the air inlet pipe, and then the gas and the liquid are filtered in the filter layer under the diversion effect of the air distribution pipe, and the gas and liquid are separated by the slow flow rate of the gas and the adsorption effect of the filter material. At the same time, by arranging multiple filter layers in the filter, the gas passes through the filter layer in parallel, the gas flow rate is slow, and the contact with the filter medium is sufficient, so that the gas and liquid are separated thoroughly, and it is not easy to form secondary mist entrainment of the gas, which can effectively avoid the blockage of the pipeline caused by the decrease in surface temperature after gas separation, and at the same time reduce the negative impact of the operating equipment on the pipeline on the gas transmission due to wall sticking and vibration, reduce the contamination of the product by mist urea when the cold air is used for crystallization, and improve the safe and stable operation level of the crystallizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the front structure of the separator body of the present invention;

[0012] Figure 2 It is a schematic diagram of the front cross-sectional structure of the separator body of the present invention;

[0013] Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle;

[0014] Figure 4 For the present invention Figure 2 Enlarged view of point B in the middle.

[0015] In the figure: 1. separator body; 2. air inlet pipe; 3. air outlet pipe; 4. separation chamber; 5. insulation steam inlet; 6. separation liquid outlet; 7. filter layer; 8. filter material inlet; 9. condensate outlet; 10. support leg; 11. air distribution pipe; 12. air collecting pipe; 13. cavity; 14. air distribution port; 15. collecting port. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0018] See also Figure 1-4 A gas-liquid separator for producing melamine based on a one-step method, comprising a separator body 1, an air inlet pipe 2, an air outlet pipe 3, a separation chamber 4, a heat preservation steam inlet 5, a separation liquid outlet 6, a filter layer 7, a filter material addition inlet 8, a condensate outlet 9, a support leg 10, a gas distribution pipe 11, a gas collecting pipe 12, a cavity 13, a gas distribution port 14 and a collection port 15; the separator body 1 is provided with support legs 10 around the bottom, the separator body 1 is provided with a cavity 13 inside, the top of the separator body 1 is connected with a heat preservation steam inlet 5, the separator body 1 A condensate outlet 9 is connected to one side of the bottom, a separation chamber 4 is installed inside the cavity 13, a filter layer 7 is installed inside the separation chamber 4, an air inlet pipe 2 is connected to one side of the separation chamber 4, one end of the air inlet pipe 2 is connected to an air distribution pipe 11, an air distribution port 14 is provided at the bottom of the air distribution pipe 11, an air outlet pipe 3 is connected to the other side of the separation chamber 4, one end of the air outlet pipe 3 is connected to an air collecting pipe 12, a collecting port 15 is provided at the top of the air collecting pipe 12, a filter material addition port 8 is installed at the top of the filter layer 7, and separation liquid outlets 6 are installed on both sides of the bottom of the separation chamber 4.

[0019] For details, please refer to Figure 2There are seven filter layers 7 , which are evenly distributed inside the separation chamber 4 ; one end of the gas distribution pipe 11 and the other end of the gas collection pipe 12 both penetrate the filter layer 7 .

[0020] By adopting the above technical scheme, gas and liquid can be effectively separated through the filter layer 7, so that the gas passes through the filter layer 7 in parallel, the gas flow rate is slow, the contact with the filter medium is sufficient, the gas and liquid are separated thoroughly, and it is not easy to form secondary mist entrainment of the gas; so that the gas distribution pipe 11 and the gas collecting pipe 12 can guide the airflow.

[0021] For details, please refer to Figure 2-4 There are three gas distribution ports 14 equidistantly distributed at the bottom of the gas distribution pipe 11 ; there are three collecting ports 15 equidistantly distributed at the top of the gas collecting pipe 12 .

[0022] By adopting the above technical solution, the airflow flows in the air distribution pipe 11 and is then discharged from the air distribution port 14 for filtration; the airflow flows in the air collection pipe 12 and is then collected by the collection port 15 .

[0023] Working principle: First, the staff can introduce air flow into the separator body 1 through the air inlet pipe 2, and then make the air flow be diverted under the action of the air distribution pipe 11, so that the air flow is separated from the air distribution port 14, and the air flow is filtered and separated under the action of the filter layer 7, and then the air flow enters the collecting pipe 12 through the collecting port 15, and passes through 7 filter layers, and 4 staggered distributed air distribution chambers and 4 collecting chambers appear. When the gas containing misty liquid urea and muddy mixture at 136°C enters the air distribution chamber separated by 4 filter layers 7 through the air inlet pipe 2 through the air distribution pipe 11, it evenly passes through the 7 filter layers to complete gas-liquid separation, and then enters the 4 collecting chambers, the purified gas is discharged from the air outlet pipe 3 through the air collecting pipe 12, so that the separated liquid is discharged through the separation liquid outlet 6, and at the same time, the staff can inject insulation steam into the separator body 1 through the insulation steam inlet 5 to prevent the separated liquid from crystallizing on the inner wall of the separation chamber 4 due to low temperature.

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A gas-liquid separator for producing melamine based on a one-step process, comprising a separator body (1), characterized in that: Support legs (10) are installed around the bottom of the separator body (1), a cavity (13) is opened inside the separator body (1), a heat preservation steam inlet (5) is connected to the top of the separator body (1), and a condensate outlet (9) is connected to one side of the bottom of the separator body (1), a separation chamber (4) is installed inside the cavity (13), and a filter layer (7) is installed inside the separation chamber (4), and seven filter layers (7) are arranged, and the seven filter layers (7) are evenly distributed inside the separation chamber (4). By arranging seven filter layers, four gas separation chambers and four gas separation chambers are arranged in an alternating manner. A gas collecting chamber is provided, one side of the separation chamber (4) is connected to an air inlet pipe (2), one end of the air inlet pipe (2) is connected to an air distribution pipe (11), a bottom of the air distribution pipe (11) is provided with an air distribution port (14), three of the air distribution ports (14) are provided, and the three air distribution ports (14) are equidistantly distributed at the bottom of the air distribution pipe (11), one end of the air distribution pipe (11) and the other end of the air collection pipe (12) both penetrate the filter layer (7), the other side of the separation chamber (4) is connected to an air outlet pipe (3), one end of the air outlet pipe (3) is connected to the air collection pipe (12), a top of the air collection pipe (12) is provided with a collection port (15), three of the collection ports (15) are provided, and the three collection ports (15) are equidistantly distributed at the top of the air collection pipe (12), a filter material addition port (8) is provided at the top of the filter layer (7), and separation liquid outlets (6) are provided on both sides of the bottom of the separation chamber (4).

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