CN205182444U - A second grade filtration equipment for cleaning natural gas - Google Patents

Abstract

The utility model discloses a secondary filtering device for cleaning natural gas, wherein, the secondary filtering device includes a conical cylinder, and a dust collecting hopper for collecting dust is connected under the conical cylinder; The inside of the conical cylinder is provided with multi-stage cyclones for separating natural gas and dust. Through the utility model, the natural gas containing impurities passes through the conical cylinder, so that the gas rotates and moves downward in the cylinder. Due to the different particle sizes of the impurities, the centrifugal force is different, so that the impurities with larger particle sizes are separated. The theoretical efficiency of the secondary filtering equipment in the utility model for cleaning natural gas has reached more than 99%, and the filtering precision is 5um, which can make the natural gas meet the requirement of daily cleaning of natural gas, and has extremely high usability.

Description

A Secondary Filtration Equipment for Cleaning Natural Gas

technical field

The utility model relates to the field of natural gas pipeline cleaning, in particular to a secondary filtering device for cleaning natural gas.

Background technique

Before the detection operation in the natural gas sub-high pressure transmission and distribution system, it is necessary to clean up the impurities in the pipeline. Due to the long operation time and high gas supply load, there are a lot of impurities in the sub-high pressure main line pipeline. During the inspection and pigging operation, the large particles of impurities are taken out through the ball collection tube, but a large amount of fine particle dust also enters the pipe network with the airflow, and this kind of small particle dust is more harmful to the downstream measurement, pressure regulation and even the user's furnace equipment. For serious, it is necessary to filter the gas.

Although gas filtration equipment is widely used, there is no precedent for the application of high-density dusty gas and node-type filtration of pipeline networks. Moreover, the size of dust particles is different, the flow rate is uneven, and the concentration changes drastically, which gathers almost all the unfavorable conditions of the design of gas filtration equipment. The existing gas filtration equipment cannot meet the actual needs.

Therefore, prior art still needs further improvement.

Utility model content

In view of the deficiencies of the prior art above, the purpose of this utility model is to provide a secondary filtering device for cleaning natural gas, aiming at solving the problem that the prior art cannot effectively process high-density dusty gas in natural gas.

The technical scheme of the utility model is as follows:

A secondary filtering device for cleaning natural gas, wherein the secondary filtering device includes a conical cylinder; inside the conical cylinder is provided a multi-stage cyclone for separating natural gas and dust; the The interior of the tapered cylinder is also provided with multiple layers of hollow fiber filter cotton; the bottom of the tapered cylinder is connected with an ash collecting hopper for collecting dust.

In the secondary filtering equipment for cleaning natural gas, an exhaust pipe and an air inlet pipe are sequentially arranged in the middle of the tapered cylinder from top to bottom.

In the secondary filter equipment for cleaning natural gas, the cyclone is a swirling three-stage cyclone.

In the secondary filter equipment for cleaning natural gas, three layers of hollow fiber filter cotton are arranged inside the conical cylinder.

The secondary filtering equipment for cleaning natural gas, wherein, the total height of the conical cylinder is 6-10 meters.

The secondary filtering equipment for cleaning natural gas, wherein, the total height of the conical cylinder is 8 meters.

Beneficial effects: the secondary filtering equipment for cleaning natural gas described in the utility model includes a conical cylinder, and a dust collecting hopper for collecting dust is connected under the conical cylinder; the conical cylinder There are multi-stage cyclones inside the cylinder for separating natural gas and dust. Through the utility model, the natural gas containing impurities passes through the cone-shaped cylinder, so that the gas rotates and moves downward in the cylinder. Due to the different particle sizes of the impurities, when the gas flows through the bottom cone-shaped cylinder, the particle size is small and light. The centrifugal force of the impurities is small, and they are discharged with the internal airflow spirally. The large and heavy impurities have a large centrifugal force and slide down along the inner edge of the cone-shaped cylinder to the bottom ash collecting hopper, thereby separating the impurities with large particle sizes. The theoretical efficiency of the clean natural gas of the utility model has reached more than 99%, and the filtering precision is 5um, which can make the natural gas meet the requirement of daily clean natural gas, and has extremely high applicability.

Description of drawings

Fig. 1 is a schematic structural diagram of the secondary filtering equipment for cleaning natural gas described in this embodiment.

detailed description

The utility model provides a secondary filtering device for cleaning natural gas. In order to make the purpose, technical solution and effect of the utility model clearer and clearer, the utility model will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Fig. 1, the utility model provides a kind of secondary filtering equipment for cleaning natural gas, wherein said secondary filtering equipment includes a conical cylinder 10; A multi-stage cyclone 30 for separating dust; a multi-layer hollow fiber filter cotton layer 40 is arranged inside the conical cylinder; a dust collecting hopper 20 for collecting dust is connected under the conical cylinder 10 . The secondary filtering equipment in the utility model passes the natural gas containing impurities through the cone-shaped cylinder, so that the gas rotates and moves downward in the cylinder. Due to the different particle sizes of the impurities, when the gas flows through the bottom cone-shaped cylinder, the particles The small and light impurities have a small centrifugal force and are discharged spirally with the internal airflow. The large and heavy impurities have a strong centrifugal force and slide down the inner edge of the cone-shaped cylinder to the bottom ash collecting hopper, thereby separating out the smaller particles. large impurities. Through the utility model, the amount of dust entering the relative main line due to the pigging operation is greatly reduced, the efficiency of the internal detection pigging operation is improved, and the operating cost is reduced; and it can make the gas cleaner and reduce the impact on the downstream secondary high/medium The shock and blockage of the equipment in the pressure regulating station improves the safe and stable operation of the equipment.

Preferably, an exhaust pipe 110 and an air intake pipe 120 are sequentially provided in the middle of the tapered cylinder 10 from top to bottom. That is, the natural gas containing high-density dust enters the conical cylinder 10 through the intake pipe 120, and undergoes the centrifugal action of the multi-stage cyclone, so that the dust with larger particle size is separated and falls to the bottom due to gravity in the collection ash hopper 20.

Through the analysis and detection of the ball impurity samples in the natural gas, it is determined that the diameter of the dust particles is about 1-30um. Because the dust particles are small, the utility model abandons the single cyclone cylinder and adopts a more efficient multi-stage cyclone form, and calculate the optimal diameter and distribution of the cyclone according to the flow velocity and particle diameter distribution simulation, avoiding the occurrence of unfavorable situations such as "blow-by" and "reverse mixing". Specifically, the cyclone described in the utility model is a swirl type three-stage cyclone.

In a preferred embodiment, the total height of the conical cylinder is 6-10 meters. More preferably, the total height of the conical cylinder is 8 meters.

In addition, since the filtration efficiency of the multi-stage cyclone is significantly affected by the fluctuation of gas pressure and flow, when the gas pressure and flow deviate from the design value, the efficiency of the cyclone separation method will drop significantly. Therefore, in order to ensure the filtration efficiency of the filter, this The embodiment preferably adopts secondary filtration to ensure the filtration efficiency when the gas pressure and flow fluctuate. Wherein, the secondary filtration adopts the form of multi-layer hollow fiber filter cotton, preferably, three layers of hollow fiber filter cotton layers 40 are arranged inside the tapered cylinder. The multi-layer filter cotton arranged behind the multi-stage cyclone not only ensures the filtration efficiency, but also makes the dust of different particle diameters evenly distributed in the filter cotton, which reduces the operating pressure loss and improves the use efficiency of the filter cotton.

To sum up, the secondary filtering equipment for cleaning natural gas described in the utility model includes a conical cylinder, and a dust collection hopper for collecting dust is connected under the conical cylinder; The inside of the conical cylinder is equipped with multi-stage cyclones for separating natural gas and dust. Through the utility model, the natural gas containing impurities passes through the cone-shaped cylinder, so that the gas rotates and moves downward in the cylinder. Due to the different particle sizes of the impurities, when the gas flows through the bottom cone-shaped cylinder, the particle size is small and light. The centrifugal force of the impurities is small, and they are discharged with the internal airflow spirally. The large and heavy impurities have a large centrifugal force and slide down along the inner edge of the cone-shaped cylinder to the bottom ash collecting hopper, thereby separating the impurities with large particle sizes. The theoretical efficiency of the clean natural gas of the utility model has reached more than 99%, and the filtering precision is 5um, which can make the natural gas meet the requirement of daily clean natural gas, and has extremely high applicability.

It should be understood that the application of the present utility model is not limited to the above examples, and those skilled in the art can improve or change according to the above description, and all these improvements and changes should belong to the protection of the appended claims of the present utility model scope.

Claims (6)

1. for a cascade filtration equipment for clean natural gas, it is characterized in that, described cascade filtration equipment includes a tapered cylinder; Described tapered cylinder inside is provided with multistage cyclone for natural gas and dust being carried out being separated; Described tapered cylinder inside is also provided with multilayer hollow fiber filter pulp layer; One is connected with for collecting the flue-dust retainer of dust below described tapered cylinder.

2. according to claim 1 for the cascade filtration equipment of clean natural gas, it is characterized in that, the middle part of described tapered cylinder is disposed with a discharge duct and admission line from top to bottom.

3. according to claim 1 for the cascade filtration equipment of clean natural gas, it is characterized in that, described Whirlwind cyclone is spiral-flow type three grades of Whirlwind cyclones.

4. according to claim 1 for the cascade filtration equipment of clean natural gas, it is characterized in that, described tapered cylinder inside is provided with three layers of doughnut filter pulp layer.

5. according to claim 1 for the cascade filtration equipment of clean natural gas, it is characterized in that, the total height of described tapered cylinder is 6-10 rice.

6. according to claim 5 for the cascade filtration equipment of clean natural gas, it is characterized in that, the total height of described tapered cylinder is 8 meters.