阅读说明：本技术 变压吸附法制备甲烷用的防过压沼气气柜 (Overpressure-proof methane gas cabinet for preparing methane by pressure swing adsorption method ) 是由 乔楠 席瑞鑫 王利平 王刚 郝学威 赵屾 朗曼 柏永青 李晓华 曹彦林 武春林 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种变压吸附法制备甲烷用的防过压沼气气柜,解决了现有工艺中沼气气柜补充气量过大容易导致气柜过压而发生爆裂的技术问题。将传统的沼气气柜的内囊设置成可伸缩的风箱式结构,用圆环形钢丝圈支撑栅栏作为内囊的骨架,通过内囊的升降来吸收沼气容量的突变,防止补充沼气过量,使内囊发生爆裂；将传统的沼气气柜的外囊,改变为钢质圆柱形筒仓,使其起到整体支撑沼气气柜的作用,使气柜整体的抗风性、牢固性、户外环境适应性等有所提高,提高了沼气气柜的安全性能。(The invention discloses an overpressure-proof methane gas holder for preparing methane by a pressure swing adsorption method, which solves the technical problem that the gas holder is easy to burst due to overpressure caused by overlarge make-up gas amount of the methane gas holder in the prior art. The inner bag of the traditional methane gas cabinet is set into a telescopic bellows structure, a circular steel wire ring support fence is used as a framework of the inner bag, and sudden change of methane capacity is absorbed through lifting of the inner bag, so that excessive supplementary methane is prevented, and the inner bag is prevented from bursting; the outer bag of the traditional methane gas cabinet is changed into a steel cylindrical silo, so that the steel cylindrical silo has the function of integrally supporting the methane gas cabinet, the wind resistance, firmness, outdoor environment adaptability and the like of the whole methane gas cabinet are improved, and the safety performance of the methane gas cabinet is improved.)

1. An overpressure-proof methane gas holder for preparing methane by a pressure swing adsorption method comprises a steel cylindrical silo (1), wherein the top end of the steel cylindrical silo (1) is provided with a conical silo top cap (2), and is characterized in that a closed bellows type inner bag (3) is arranged in the steel cylindrical silo (1), annular air bag support rings (6) are arranged in the closed bellows type inner bag (3) at intervals along the vertical direction, an air bag lifting guide ring (5) is arranged on the outer side wall of the bellows type inner bag (3) at the support part of the annular air bag support rings (6), air bag lifting guide columns (4) are arranged on the ground between the bellows type inner bag (3) and the steel cylindrical silo (1) at equal intervals in a radian manner, the air bag lifting guide ring (5) is sleeved on the air bag lifting guide columns (4), and an air bag top lifting traction rope group (9) is arranged on the top end surface of the closed bellows type inner bag (3), a top end fixed pulley (10) is arranged on a center top of a conical silo top cap (2), a steering fixed pulley (12) is arranged on the outer side surface of the top end of a steel cylindrical silo (1), the upper end of an air bag top lifting traction rope set (9) is connected with one end of a balance traction rope (11), the other end of the balance traction rope (11) is connected with a balance hanging block (13) after passing through the top end fixed pulley (10) and the steering fixed pulley (12) in sequence, and a biogas input pipeline (7) and a biogas output pipeline (8) are respectively arranged on a bellows type inner bag (3).

2. The overpressure-preventing methane gas holder for preparing methane by the pressure swing adsorption method according to claim 1, wherein an electrically controlled regulating valve (15) is arranged on the methane input pipeline (7), a methane pressure gauge (14) is arranged on the methane output pipeline (8), and the electrically controlled regulating valve (15) is electrically connected with the methane pressure gauge (14).

Technical Field

The invention relates to a preparation system of high-purity methane, in particular to a methane supply gas cabinet used in the process of preparing methane by a pressure swing adsorption method.

Background

Purifying and preparing methane from the methane by adopting a pressure swing adsorption method, a water washing method, a membrane separation method and other methods, wherein the pressure swing adsorption method is to analyze and separate the methane by changing the adsorption pressure of a molecular sieve to finally obtain the methane, the methane is introduced into an inlet of a molecular sieve adsorption tower of the pressure swing adsorption method and is analyzed and separated in the molecular sieve adsorption tower, the analysis process requires that the gas inlet flow of the methane is constant, and the pressure of the methane entering the molecular sieve adsorption tower is also constant, so that the methane with high purity can be analyzed and separated; the existing pressure swing adsorption method for preparing methane is characterized in that a methane gas cabinet with fixed capacity is connected to a molecular sieve adsorption tower, methane with certain gas quantity and temperature is stored in the methane gas cabinet, during the analysis production process, the methane gas quantity flowing out of the methane gas cabinet is measured, and methane with the same gas quantity is dynamically supplemented into the methane gas cabinet, so that the pressure of the methane entering the molecular sieve adsorption tower is constant, the gas entering quantity of the methane is constant, and due to the change of the flow and the pressure at a methane outlet of the methane gas cabinet, the methane is fed back to an executing mechanism on a gas inlet of the methane gas cabinet, a certain time delay and hysteresis are caused, the phenomenon of excessive or insufficient adjustment of the gas inflow can often occur, the fluctuation of the flow and the pressure of the methane entering the molecular sieve adsorption tower can be directly caused, and the analysis purity of the methane can be influenced; in addition, after the running time of the control system of the biogas tank is long, due to the accumulation of errors of the control system, particularly after the control device is accidentally broken down, the biogas amount supplemented by the biogas tank is overlarge in a short time, so that the biogas tank is over-pressurized and burst.

Disclosure of Invention

The invention provides an overpressure-proof methane gas holder for preparing methane by a pressure swing adsorption method, which solves the technical problem that the gas holder is easy to burst due to overpressure caused by overlarge make-up gas amount of the methane gas holder in the prior art.

The invention solves the technical problems by the following technical scheme:

The general concept of the invention is: the inner bag of the traditional methane gas cabinet is set into a telescopic bellows structure, a circular steel wire ring support fence is used as a framework of the inner bag, and sudden change of methane capacity is absorbed through lifting of the inner bag, so that excessive supplementary methane is prevented, and the inner bag is prevented from bursting; the outer bag of the traditional methane gas cabinet is changed into a steel cylindrical silo, so that the steel cylindrical silo has the function of integrally supporting the methane gas cabinet, the wind resistance, firmness, outdoor environment adaptability and the like of the whole methane gas cabinet are improved, and the safety performance of the methane gas cabinet is improved.

An overpressure-proof methane gas holder for preparing methane by a pressure swing adsorption method comprises a steel cylindrical silo, wherein a conical silo top cap is arranged at the top end of the steel cylindrical silo, a closed bellows type inner bag is arranged in the steel cylindrical silo, annular air bag support rings are arranged in the closed bellows type inner bag at intervals along the vertical direction, an air bag lifting guide ring is arranged on the outer side wall of the bellows type inner bag at the supporting position of the annular air bag support rings, air bag lifting guide columns are arranged on the ground between the bellows type inner bag and the steel cylindrical silo at equal intervals in an arc manner, the air bag lifting guide rings are sleeved on the air bag lifting guide columns, an air bag top lifting traction rope set is arranged on the top end surface of the closed bellows type inner bag, a top fixed pulley is arranged on the center top tip of the conical silo top cap, and a steering fixed pulley is arranged on the outer side surface of the top end of the steel cylindrical silo, the upper end of the lifting traction rope group at the top of the air bag is connected with one end of a balance traction rope, the other end of the balance traction rope is connected with a balance hanging block after sequentially passing through a top end fixed pulley and a steering fixed pulley, and a biogas input pipeline and a biogas output pipeline are respectively arranged on the air box type inner bag.

An electric control regulating valve is arranged on the methane input pipeline, a methane pressure gauge is arranged on the methane output pipeline, and the electric control regulating valve is electrically connected with the methane pressure gauge.

The invention has simple structure, when excessive marsh gas enters the bellows type inner bag, the bellows type inner bag absorbs the excessive marsh gas to expand through expansion, burst caused by sudden rise of air pressure is avoided, when the air bag is insufficient, the air bag is contracted through the balance hanging block, and the pressure of the marsh gas in the bellows type inner bag is kept within a certain value range.

drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings:

An overpressure-proof methane gas holder for preparing methane by a pressure swing adsorption method comprises a steel cylindrical silo 1, wherein the top end of the steel cylindrical silo 1 is provided with a conical silo top cap 2, a closed bellows type inner bag 3 is arranged in the steel cylindrical silo 1, annular air bag support rings 6 are arranged in the closed bellows type inner bag 3 at intervals along the vertical direction, the outer side wall of the bellows type inner bag 3 at the support part of the annular air bag support rings 6 is provided with an air bag lifting guide ring 5, air bag lifting guide columns 4 are arranged on the ground between the bellows type inner bag 3 and the steel cylindrical silo 1 at equal intervals in radian, the air bag lifting guide ring 5 is sleeved on the air bag lifting guide columns 4, an air bag top lifting traction rope group 9 is arranged on the top end surface of the closed bellows type inner bag 3, a top fixed pulley 10 is arranged on the center top point of the conical silo top cap 2, the outer side surface of the top end of the steel cylindrical silo 1 is provided with a steering fixed pulley 12, the upper end of a lifting traction rope group 9 at the top of the air bag is connected with one end of a balance traction rope 11, the other end of the balance traction rope 11 is connected with a balance hanging block 13 after passing through a top end fixed pulley 10 and the steering fixed pulley 12 in sequence, and a biogas input pipeline 7 and a biogas output pipeline 8 are respectively arranged on the bellows type inner bag 3.

An electric control regulating valve 15 is arranged on the methane input pipeline 7, a methane pressure gauge 14 is arranged on the methane output pipeline 8, and the electric control regulating valve 15 is electrically connected with the methane pressure gauge 14.

When the methane is introduced into the methane gas cabinet, the bellows type inner bag 3 can be slowly lifted along with the increase of the gas amount in the cabinet, meanwhile, the annular air bag support ring 6 is lifted along the air bag lifting guide post 4, when the bellows type inner bag 3 is lifted, the traction of the air bag top lifting traction rope group 9 and the guide of the air bag lifting guide post 4 are provided, the bellows type inner bag 3 is ensured not to deviate from a lifting track, the methane stored in the bellows type inner bag 3 is constant-pressure methane, the pressure can be adjusted by adjusting the weight of the balance hanging block 13, a pressure transmitter is arranged in the methane output pipeline 8, the pressure of the bellows type inner bag 3 is monitored in real time, and the control system gives an alarm prompt when the pressure is abnormal.