WO2020098222A1

WO2020098222A1 - Sewer biogas explosion-proof system

Info

Publication number: WO2020098222A1
Application number: PCT/CN2019/083585
Authority: WO
Inventors: 张敬敏
Original assignee: 微山宏瑞电力科技有限公司
Priority date: 2018-11-15
Filing date: 2019-04-22
Publication date: 2020-05-22
Also published as: CN109469820A

Abstract

A sewer biogas explosion-proof system, comprising an isolation device (1) located below a manhole cover (3), and an embedded water pipe (2). The isolation device comprises a bottom plate (11) and a side plate (12), the area of the bottom plate covers the manhole cover, one side of the isolation device is hinged to a side wall of a manhole tunnel (4), and the periphery thereof is fixed to the top of the manhole tunnel by means of a magnetic chuck located at the top of the side plate. The bottom plate, the side plate and a manhole wall constitute an accommodating box for objects entering from the manhole cover as a whole. By means of the arrangement of the magnetic chuck, the isolation device can be easily opened along a hinged edge, and the embedded water pipe passes through the manhole wall from a position between the bottom plate and the manhole cover and extends to the bottom of the manhole tunnel. The sewer biogas explosion-proof system has a simple overall structure, and is able to effectively prevent a fire source from contacting biogas within the manhole tunnel, avoiding the occurrence of an explosion accident. The isolation device also facilitates the recovery of waste falling into a manhole, prevents contamination of the manhole tunnel and has a good environmental protection effect.

Description

Sewer anti-biogas explosion system

Technical field

The invention belongs to the technical field of municipal construction, and particularly relates to a sewer anti-biogas explosion system.

Background technique

With the development of cities, the laying of urban pipeline networks is becoming more and more dense, and sewers are the most basic public facilities among many pipelines. Their main role is to discharge urban sewage and rainwater. In recent years, sewer explosions have occurred in many cities in China.

Summary of the invention

technical problem

The reason for the explosion is on the one hand due to the biogas content in the pipeline (due to the presence of too much sewage and feces in the sewer, biogas is produced by microbial fermentation under anaerobic conditions for these organics, when the air contains 8.6% ~ 20.8 % (By volume) of biogas, an explosive mixed gas will be formed); on the other hand, it is due to people ’s negligence, for example: cigarette butts that are not extinguished are thrown into the pipeline, and fireworks and firecrackers fall accidentally during the New Year and New Year Into the well, especially the curiosity of some playful children when setting off fireworks and firecrackers, it is easy to throw the fire source into the wellhead, resulting in a dangerous accident. In addition, most of the manhole covers of the sewers are equipped with a cover for running water. After a long period of use, there is too much garbage (waste paper scraps, plastic bags, cigarette butts) in the pipeline, which not only pollutes the sewer, but also a lot of garbage will affect the circulation of the water channel. Clean up trouble. Technical solution

In order to overcome the above-mentioned defects of the prior art, the present invention aims to provide a sewer anti-methane gas explosion system that can prevent an explosion accident in a sewer when a fire source falls into a wellhead and can promptly clean up pollutants falling into a manhole cover.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

A sewer anti-biogas explosion system includes an isolation device located under a manhole cover and a pre-buried water pipe; the isolation device includes a bottom plate and a side plate, the bottom plate area covers the manhole cover, one side is hinged with the side wall of the shaft, and the periphery passes through the side The magnetic chuck on the top of the plate is fixedly connected to the top of the hoistway; the pre-buried water pipe penetrates into the well wall from the isolation device and the well cover to the bottom of the hoistway.

Preferably: it also includes a straight-through pipe and a biogas detector located in the pre-buried water pipe, the straight-through pipe connects the pre-buried water pipe to the surface, the straight-pipe mouth is covered by an elastically connected pipe cover, and a ventilating fan is provided at the outlet , The biogas detector and the ventilation fan are electrically connected through the control center.

Preferably: a sealing ring is provided on the outer periphery of the contact surface between the side plate and the top of the hoistway.

Preferably: the inlet and outlet of the pre-buried water pipe are provided with metal filter nets.

Preferably: the pre-buried water pipe and the straight pipe are cast stone pipes.

Preferably: the isolation device is silicon calcium gypsum fiberboard.

Solution to the problem

Beneficial effects of invention

Beneficial effect

Compared with the prior art, the present invention has the following advantages:

1. The isolation device can effectively prevent the explosion of the fire source entering the manhole cover and the biogas, which greatly improves safety.

2. The isolation device plays a role in intercepting solid waste to a certain extent, which can effectively prevent solid waste from entering the shaft, and the isolation device is located at the mouth of the shaft, which is convenient for cleaning and has a good environmental protection effect.

Brief description of the drawings

BRIEF DESCRIPTION

1 is a schematic diagram of the cross-sectional structure of the present invention;

Fig. 2 is a schematic structural view of the present invention provided with a straight-through pipe.

In the picture: 1. Isolation device; 11. Bottom plate; 12. Side plate; 2. Pre-buried water pipe; 3. Manhole cover; 4. Hoistway; 5. Straight pipe; 6. Biogas detector; 7. Pipe cover; 8. Ventilation fan.

The best embodiment of the invention

Best Mode of the Invention

DETAILED DESCRIPTION Example 1

As shown in FIG. 1, the present invention discloses a sewer anti-methane gas explosion system, which includes an isolation device 1 and a pre-buried water pipe 2 located below the manhole cover 3; the isolation device 1 includes a bottom plate 11 and side plates 12, and the bottom plate 11 The area covers the manhole cover 3, one side is hinged to the side wall of the hoistway 4, the periphery is fixed to the top of the hoistway 4 by a magnetic chuck located at the top of the side plate 12, the bottom plate 11, the side plate 12 combined with the whole of the well wall constitute an object (solid from the manhole cover 3) And liquid), through the installation of magnetic chuck, the isolation device 1 can be easily opened along the hinged edge, so as not to affect daily maintenance and protection; the way of setting the side plate 12 can be replaced according to the width of the shaft 4, when the shaft is wide enough It can be fixedly connected with the bottom plate 11 integrally. When the width is insufficient, the side plate 12 and the bottom plate 11 can be rotated and connected (for example: hinged) so that it can be folded inward to facilitate the bottom plate to open downward; The bottom plate 11 and the well cover 3 penetrate into the well wall and extend to the bottom of the hoistway 4.

The main component of biogas is methane, the content of which is between 50% and 80%, which is flammable and is the main cause of explosions in sewers. In the present invention, an isolation device 1 is provided at the well cover 3, and the space of the isolation device 1 is communicated with the bottom of the well 4 through the pre-buried water pipe 2. The isolation device 1 and the pre-buried water pipe 2 form a channel for rainwater to enter the well 4, so that the well cover 3 The incoming water flow enters the bottom of the hoistway 4 through the pre-buried water pipe 2 (the entrance of the pre-buried water pipe 2 should be as close as possible to the surface of the bottom plate 11, preferably between 1mm and 3mm; in order to make the water flow into the well 4 as much as possible, the bottom plate 11 uses the hinge point as The rotation axis and the horizontal plane should be set at a certain angle. If the angle is too large, solid materials will accumulate in the inlet of the pre-buried water pipe 2 and block. Generally, the angle is 3 ° to 15 °, preferably 7 ° to 11 °), and the solid waste Then stay on the isolation device 1. Since methane is lighter than air, it will circulate to the top of the hoistway 4 after the hoistway 4 is produced, and the outlet of the reserved water pipe 2 in the hoistway 4 is at the bottom, and the reserved water pipe 2 and the isolation device 1 are opposite to the methane in the hoistway 4 In the isolated state, the methane content in the reserved water pipe is almost zero. When a fire source enters the hoistway 4 through the manhole cover 3, it can only stay on the bottom plate 11 until it is completely extinguished.

It can be seen from the above analysis that the tightness of the isolation device 1 plays an important role, and the isolation device 1 can be tightly connected to the top of the shaft 4 through the magnetic chuck (the magnetic chuck has a significant connection effect and is easy to install. When the internal maintenance of the shaft 4 is required Just open the magnetic chuck, so that the isolation device 1 is hung on the inner wall of the hoistway through the hinged end), a sealing ring is provided on the outer periphery of the contact surface between the side plate 12 and the hoistway 4 to further improve the isolation between the isolator 1 and the hoistway 4 Sealing to prevent the methane gas in the well 4 from entering the isolation device 1; In addition, the isolation device 1 should use a plate with good fire resistance, preferably silicon-calcium gypsum fiberboard, which is light, non-combustible, fire-resistant, and contains crystalline water. It can accelerate the extinguishing of the fire source falling on the board; the pre-buried water pipe 2 is set in the side wall of the shaft 4, so it needs to have good wear resistance and corrosion resistance. The pre-buried water pipe 2 of the present invention uses cast stone Pipe (cast stone is an ideal substitute material for steel, iron, lead, rubber, wood, etc.), which has a high degree of wear resistance, acid and alkali corrosion resistance that cannot be achieved by ordinary metals, and has a prolonged equipment use period and reduced maintenance man-hours. , To improve production efficiency, reduce product costs, etc.); In order to prevent solid waste from entering the pipeline and causing blockages, metal filters are provided at the inlet and outlet of the pre-buried water pipe 2. In order to prevent the amount of biogas in the hoistway 4 from being too large and filling the hoistway, a ventilation device may be provided on the top of the hoistway 4 to discharge the biogas according to the biogas detection amount of the hoistway 4.

Compared with the prior art, the present invention has a simple overall structure design, which can effectively prevent the fire source from contacting the methane gas in the well 4 and avoid the explosion accident; in addition, the metal filter at the inlet and outlet of the pre-buried water pipe 2 can effectively intercept the external And the solid waste of the well 4 enters the water pipe, and the isolation device 1 also facilitates the recovery of the waste falling into the wellhead, prevents pollution of the well, and has a good environmental protection effect.

Invention Example

Embodiments of the invention

Example 2

As shown in FIG. 2: In this embodiment, on the basis of Embodiment 1, a straight pipe 5 and a biogas detector 6 located in the embedded water pipe 2 are provided. The straight pipe 5 connects the embedded water pipe 2 to the ground surface. The mouth of the straight-through tube 5 is closed by a tube cover 7 connected elastically, and an aeration fan 8 is provided at the outlet. The biogas detector 6 and the aeration fan 8 are electrically connected through a control center. This arrangement can discharge a small amount of biogas that has penetrated through the bottom of the pre-buried water pipe 2 during long-term use. Specifically, the biogas detector 6 detects the biogas content in the pre-buried pipeline 2. When the alarm value is reached, the ventilation fan 8 in the straight pipe 5 is turned on by the control center. After the ventilation fan 8 is turned on, the elastically connected pipe cover 7 is blown off. The biogas in the pipeline is discharged through the nozzle of the straight-through pipe 5. When the biogas content is lower than the set value, the ventilation fan 8 is turned off, and the tube cover 7 falls back to the nozzle through the elastic member.

This embodiment is more perfect on the basis of Embodiment 1, which can make the entire system safer and can be used for a long time, reduce the maintenance frequency, and save manpower and material resources.

Industrial applicability

Type the paragraph describing the industrial practicability here.

Sequence listing free content

The above embodiments are only preferred embodiments of the present invention, and any modifications or improvements made in accordance with the spirit and essence of the present invention based on the present invention should fall within the protection scope of the present invention.

Claims

A sewer anti-biogas explosion system, characterized by comprising an isolation device (1) and a pre-buried water pipe (2) located under the manhole cover (3); the isolation device (1) includes a bottom plate (11) and a side plate (12) ), The area of the bottom plate (11) covers the well cover (3), one side is hinged with the side wall of the well (4), and the periphery is fixedly connected to the top of the well (4) by a magnetic chuck at the top of the side plate (12); The pre-buried water pipe (2) extends from the bottom plate (11) and the manhole cover (3) into the well wall to the bottom of the hoistway (4).
The sewer anti-biogas explosion system according to claim 1, characterized in that it further comprises a straight-through pipe (5) and a biogas detector (6) located in the pre-buried water pipe (2), the straight-through pipe (5) Connect the pre-buried water pipe (2) to the surface, the mouth of the straight pipe (5) is covered by a flexible pipe cover (7), and an air ventilator (8) is provided at the outlet, the biogas detector (6), The ventilation fan (8) is electrically connected through the control center.
Type claim 3 here.
The sewage anti-biogas explosion system according to claim 1 or 2, characterized in that a seal ring is provided on the outer periphery of the contact surface between the side plate (12) and the top of the shaft (4).
The sewage anti-biogas explosion system according to claim 4, characterized in that the pre-buried water pipe (2) and the straight-through pipe (5) are cast stone pipes.
A sewer anti-methane gas explosion system according to claim 4 or 5, characterized in that the isolation device (1) is a siliceous calcium gypsum fiberboard.