MXPA01005665A - Leachate and depollution pneumatic pump with sleeve valve - Google Patents

Abstract

The invention concerns a pneumatic pumping device for pumping liquids such as landfill leachates and polluted liquids or thick matter. The device comprises a tubular body (1) forming a pump body and defining a cylindrical main chamber (2) in the upstream and downstream ends of which respectively emerge an inlet (3) and outlet (4) for the liquid to be pumped. The pneumatic device further comprises a sleeve valve (7) arranged in front of the inlet to control the passage of the liquid to be pumped through said orifice, means (8) for controlling the opening and closure of the sleeve valve with a compressed gas, a delivery pipe (9) passing through the outlet and extending inside the tubular body over the major part of the length thereof, and means (10) for supplying the main chamber with compressed gas.

Description

or 1 / S66S ' PNEUMATIC PUMP OF LEACHING AND DECONTAMINATION WITH VALVE SLEEVE The invention relates more particularly to a pneumatic pumping device that operates discontinuously and with compressed gas, for example air, and whose purpose is to pump all kinds of liquids and, more especially, but not exclusively, liquids such as leached of sanitary landfills, thick matter or contaminated and possibly thick liquids. Within the framework of this invention, the term "liquid" refers to all these liquids in an indistinct manner. The pneumatic pumping device of the invention has the purpose of operating in a submerged position and pumping leachates and other liquids, regardless of whether they are contaminated and / or thick or not, from depths of the order of 50 to 60 meters. Such liquids can have a high temperature, for example, of the order of 80 ° C. In addition, these liquids can be loaded with salt and transport abrasive particles such as sand, clay particles or sandy mud. Most pumps on the market have many limitations when they must be used to pump leachates or contaminated and / or thick liquids. In fact, motor pumps are often not explosion-proof since they operate directly with electricity; and all known pneumatic pumps, which are explosion-proof since they receive energy produced by compressed air, contain strainers, seals or floats which can be blocked or blocked regularly by the presence of mud and mud at the bottom of the pumping wells of liquid, and by the presence of chloride deposits. In addition, the presence of a float or a shutter can limit the possibilities of positioning the pump. These problems cause high maintenance costs in terms of pumps as well as repeated handling of the materials despite the toxicity risks associated with certain pumped products. In addition, in the case of certain pneumatic pumps, devices associated with a float are suggested, which cause the supply of air directly to the pump. The purpose of these pumps is to allow control of the operation of the pump directly, in relation to the arrival and level of the liquid. However, when the float is blocked, the pump is not operating and the pump operator can not know if the pump is running, not running, or off. Another limitation is the very important number of maintenance parts. Likewise, in most landfills, the permanent problem is the presence of plastic films that float on the surface of the leachate, which regularly causes plugging and suspension of the operation of the pumps. In addition, it may be interesting for the operator of the landfill to be able to regulate the operation of the pump in accordance with the level of leachates or contaminated liquids in the well, without running the risk of causing an explosion, for example due to a spark. In fact, sanitary landfill wells now often have a dual mission: to allow the pumping of leachates to the surface and to pump biogas. The purpose of the invention is to offer a pneumatic pumping device that can solve the above mentioned limitations and that can be easily placed in a well or in a drilling at various depths. The purpose of the invention is achieved with a pneumatic pumping device of a liquid that operates discontinuously and in a submerged condition, and with compressed gas, and intended to pump liquids such as leachates from landfills. This device comprises a tubular body which forms a pump body and which defines a cylindrical main chamber at the ends upstream and downstream from where emerge, respectively, an inlet orifice and an outlet orifice for the liquid to pump. According to the invention, the pneumatic device comprises a sleeve valve positioned in front of the inlet orifice to control the passage of the liquid to be pumped through said orifice, a device for controlling the opening and closing of the sleeve valve with a gas compressed, a supply tube passing through the outlet orifice and extending inside the tubular body over the main part of its length, and a device for supplying a compressed gas to the main chamber. The invention also relates to the following characteristics, considered individually or in all their technically possible combinations: - The pumping device can be used in vertical position as well as "in horizontal or inclined position - This advantage is due to the fact that the device it does not include seals or floats - The tubular body that forms a pump body consists essentially of a cylindrical tube closed at both ends, the end upstream and the end downstream, respectively, with a bottom plate and an upper plate, while the space between these two plates forms the main chamber of the pumping device, the entrance hole of the main chamber is found in the lower section of the tubular body, taking into account the position of use of the device according to the invention and the outlet hole is in the upper section of the tubular body. - In a profitable manner, taking into account the cylindrical shape of the tubular body as well as the main chamber, the entrance orifice of the main chamber is located in a lower plate of the tubular body and the outlet orifice is located in the upper plate. - The pump body has a cylindrical revolution. - The sleeve valve consists of a tubular body that forms a secondary chamber at the ends upstream and downstream from which emerge, at each end, at least one opening for the passage of the liquid to be pumped. These passage openings are connected together through an elastically ductile sleeve constituting ur. channel through which the liquid to be pumped flows to penetrate into the main chamber of the pumping device. The sleeve seals the channel of the secondary chamber surrounding the channel. - The tubular body of the pump, the plates and the sleeve valve are made of materials resistant to thick materials, contaminated liquids, liquids with salts and liquids whose temperatures can be higher at 80 ° C. - The pump body can be made from a material selected from the group consisting of iron, stainless steel, coated iron, planers, glass and fiberglass materials, materials that withstand very high temperatures and pressures, coated materials and alloys . - The material of the tubular body of the camber is selected in such a way that the body is protected by an anticorrosive coating, to avoid oxidation and deposits of chlorine. - The sleeve valve is placed on the outside and adjacent to the tubular body in front of the inlet feed, and the sleeve is positioned advantageously in relation to the axis of the inlet orifice. However, the sleeve can also be displaced radially. The liquid to be pumped can not reach the main chamber to the extent that the manhole valve is closed. - The inlet port of the main chamber and the sleeve of the sleeve valve are positioned ccaxially in relation to the axis of the tubular body. In order to control the passage of the liquid to be pumped through the inlet, the space surrounding the passage channel of the manhole valve is connected through a pipe integral with the body tubular, to a source of compressed gas supply. This arrangement allows control of the closure of the sleeve valve by injecting a compressed gas into the space of the secondary chamber surrounding the channel and to obstruct the sleeve. - The supply pipe that passes through the outlet hole extends outwardly from the main chamber over a distance allowing the connection of the supply pipe to a conduit connecting the pumping device to a connector provided for receiving the liquid to pump. - The supply pipe is equipped with a return valve. - The supply pipe extends central to the main chamber almost to the bottom plate. The distance between the free end of the supply pipe and the bottom plate delineates the volume or amount of liquid remaining in the main chamber at the end of the extraction phase. An intelligent selection of this distance allows a complete emptying of the main chamber. The devices that allow to supply compressed gas to the main chamber advantageously consist of an opening provided in the upper plate of the tubular body, while the opening allows the connection of the main chamber, for example, through a pipe which passes through the upper plate of the tubular body and through any other device to be copied, to a supply source of compressed gas. - At least one of the pipes between the supply pipe, the compressed gas supply pipe of the main chamber and the compressed gas supply pipe of the secondary chamber does not protrude from the wall of the pump body. The connection of the pipe (s) in question is made, for example, by threaded coupling (s). - The pumping device is equipped with at least one buttonhole to fix a chain, a cable or a film that allows the device to be lowered into a well, in order to hold it and maintain it at a predetermined level (depth) to lift and pull it from the pozc. More frequently, the pumping device will be equipped with two eyelets, but it can evidently present more than two eyelets. - The pumping device is equipped with a protective grid or a strainer that allows the sleeve valve to be protected against loads whose sizes exceed a selected limit value. This limit value or maximum pattern is advantageously defined through the mesh size of the grid. - The pumping system is equipped with an integrated tripod with the body of the pump or with a tripod screwed or welded on the body of the pump, for example, through a base circular base. - The pipes used for the connection of the compressed air supply of the pump body and the sleeve valve, and possibly the supply pipe also protrude from the pump body. In this mode, the connection of each of these pipes with corresponding pipes from the surface of the well or of the perforation is effected, for example, through a threaded coupling, at a given distance from the upper plate of the pump body. . Thanks to this placement, the operator has a better grip of the pump when inserted into the well or drilling. The pneumatic pumping device, which is referred to below as "the pump" as well, is designed to operate in a submerged form. Thus, the placement of the supply pipe in the upper plate of the tubular body is advantageous since the liquid to be bumped can be emptied through a straight pipe. However, any different placement, for example, the connection of a pipe bent over the side wall of the tubular body, also corresponds to the principle of this invention. The pump operates as follows: The secondary chamber of the sleeve valve is depressurized. Thus, the sleeve expands, the sleeve valve opens and the liquid to be pumped enters the main chamber of the submerged pump. The level of the liquid inside the pump and outside, that is, in the well are balanced according to the principle of the communicating vessels. When the main chamber is full, delay devices ("timer") trigger a device to control the cuff valve and pressurize said valve. Then the compressed air enters into communication with the secondary chamber of the cuff valve, which means that the pressure of the compressed air pushed the ductile sleeve back to the constriction in such a way that the orifice of the inlet of the main chamber is plugged to prevent liquids and sludge from entering or leaving the pump body, which isolates liquids and sludge from the external environment of the well, in the body of the pump. After a period given by the delay devices, which control the closure of the valve sleeve and keep it in the closed position, compressed air is sent to the main chamber of the pump body. This penetration of compressed air expels leachates and liquids contained in the pump body, through the delivery pipe to the surface of the well and into a collector or tank or any appropriate device ctrc available to receive the pumped liquid. When the main chamber and supply pipe for all liquids are purged, the sleeve valve contruct member depressurized the secondary chamber, which allows, on the one hand, the expansion of the sleeve and the release of the chamber's inlet hole. and, in this way, on the other hand, this allows the pumping device to return at the beginning of the cycle. For good operation of the pump, several conditions must be fulfilled profitably: The sleeve valve is placed in the extension of the main chamber. Advantageously, the tubular body constitutes at the same time the outer wall of the main chamber and the secondary chamber. In an installation of this tipc, the lower plate separates both chambers in a hermetic manner. - The passage opening of the valves is placed at a level above which the well of sanitary landfill or pumping of contaminated liquids must be emptied imperatively. - The filling of the pump with compressed air is carried out through the upper section of the pump body in order to avoid the formation of air bubbles in the liquid. } - The ductile sleeve is made of a material resistant to abrasion and temperatures of the order of 80 ° C and can also be resistant to different types of contaminated liquids or present all these qualities at the same time. - The body of the pump is cylindrical and corresponds, in terms of its shape and / or size, to the different diameters of the wells. - The length of the pump body corresponds to the main diameters of the wells but it is at least one meter, which allows to contain leached or contaminated liquids of the order of 4 to 5 liters. - By way of example, a pump body one meter long and with a useful diameter of 80mm contains 4 to 5 liters. - The operating pressure of the sleeve valve is determined by the limit pressure that ensures a perfect tightness. - The maximum operating pressure of the compressed air in the pump body is 1.5 to 2 times less than the pressure used in the sleeve valve. Thus, to illustrate in the case of a guaranteed valve for 8 bar, the operating pressure should not exceed 6- 6.5 bar. With a pressure of the order of 6-6.5 bar, the device allows a pump of low flow rate, in the order of 0 to 10 irr per day, which corresponds to most applications. A pressure of this type in the body of the pump allows the pumping up of liquids on a total pump height of approximately 60 to 65 meters in the case of liquids whose density is close to 1. In order to protect the compressed air supply pipe of the sleeve valve against possible damage caused by friction against the wall of the well, three modalities are contemplated. According to a first embodiment, the pipe is integrated into the body of the pump according to the second embodiment, the pipe is placed along the body of the pump outside said body, and in accordance with the third embodiment, It holds a protective conduit against the body of the pump and the pipe is placed inside the conduit. This conduit can also receive wires connected to level control contacts. These contacts determine a signal that authorizes the stop or restart of the pump, in accordance with the liquid level in the well. The presence of a conduit also allows the insertion of a pipeline of fluid level detection device of the "bubble to bubble" type. The fact of staggering several contacts along the body of the pump allows the generation of staggered signals that provide the operator with a water balance of the well, at the time considered. The main interest of the pneumatic pumping device of according to the present invention is that it is totally explosion-proof, and that, combined with several remotely corrected implanted electrodes defined along the conduit or along the body of the pump, for example, every 5, 10 or 20 centimeters, also allows to obtain at any time, by periodic or continuous reading of these signals, the level and variations in terms of liquid levels in the well or drilling. The following description refers to figures 1 to 4 which represent a pumping device ("the pump") according to a preferred embodiment of the invention, in four successive stages of a pumping cycle. The pump comprises a tubular body 1 which forms a pump body and which defines a cylindrical main chamber 2, at the ends of which upstream 3 and downstream 4, respectively arise an inlet 5 and an outlet orifice 6 for the liquid to be pumped . The pump further comprises a sleeve valve 7 centered against the inlet 5 to control the passage of liquid to be pumped through said orifice, devices 8 for controlling the opening and closing of the sleeve valve 7 with a compressed gas, a supply pipe 9 passing through the outlet orifice 6 and extending inside the tubular body over the main part of its length, and a device 10 for supplying compressed gas to the main chamber 2. The supply pipe is advantageously equipped, but not necessarily, with a return valve 18. The tubular body 1 is formed through a closed cylindrical revolution pipe er. both ends, the lower upstream end 3 and the upper downstream end 4, respectively, with a lower plate 31 and with an upper plate 41, which delineate inside the tubular body 1 the main chamber 2. The plates 11 and 31 make up the ends upstream and downstream of the secondary chamber, each equipped with a passage opening. In accordance with the embodiment presented in the figures, the wall of the pump body extends beyond the lower plate 31 in order to also constitute the external wall of the valve sleeve 7. The sleeve valve 7 comprises, in addition to the outer wall a plate 11 that delineates with the external wall and with the lower plate 31 of the main chamber 2, a secondary chamber 12. The plate 11 is equipped with a passage opening 13 through which the liquid to be pumped penetrates in the valve 7. The liquid then emerges through the lower orifice 5 of the main chamber 2 which fulfills a double function in the embodiment shown: passage opening at the outlet of the sleeve valve 7 and inlet opening of the main chamber 2. It is evident that the sleeve valve can be an individual element with its own tubular body constituting the external wall of the valve and having an upper plate different from the plate 31 and equipped with a passage opening which it forms the outlet of the valve 7. In this mode, the diameter of the external wall of the valve may differ from the diameter of the body of the pump. The sleeve valve 7 comprises, independently of its configuration, a sleeve 14 which is made of an elastically ductile material and which connects the openings upstream and downstream of the valve thus forming a channel through which the liquid to be pumped must flow with the object of penetrating into a main chamber 2 of the pump. The sleeve 14 also separates, hermetically, the channel of the secondary chamber, which surrounds the channel. The pump body is equipped, in its upper section with two holes 15 and 16, through which to pass, two compressed gas pipes, which are known as 8 and 10. The supply pipe 8 is representative of a means that it allows control of the opening and closing of the sleeve valve 7 with compressed gas, for example compressed air. This pipe 8 is connected at one of its ends to the secondary chamber 12 and on the other of its ends to a generally flexible conduit which, in turn, is connected to a source of compressed gas. According to the embodiment shown, the pipe 8 passes through the hole 15 provided in the upper part 41 of the pump body. The supply pipe 10 is representative of the devices for supplying compressed gas to the main chamber 2. This pipe 10 is connected through one of its ends to the hole 16 provided in the upper plate 41 of the pump body and through the other end to a generally flexible conduit which, in turn, is connected to a source of compressed gas. This source of compressed gas, for example, a compressed air tank, may be the same source as the source supplying the secondary chamber. It is evident that in that case, each of the pipes 8 and 10 is connected to the compressed air tank through different control means. The pump body further comprises two welded l7 holes on the upper plate 41 of the pump body, in order to hold, for example, a chain or a cable through which the pump is operated and maintained in the well. According to a variation of the embodiment shown, the pump can be equipped with a tripod fixed on the pump body, for example, at the same height as the plate 31 through a base welded on the body of the pump. The space formed by the feet of the tripod can be delineated by a grid of maya fastened around the tripod and that protects the sleeve valve against the penetration of plastics or other possible bodies. The protection mesh around the tripod may be composed of a double row of mayas of identical or different sizes. The diameter of the compressed air and liquid supply pipes depends on the desired flow rate and the length of your pipes depends on the pumping height of the liquid in the well. This device shows the following advantages: - The pump is volumetric: that is, in each cycle, the compressed air repels a volume of liquid equal to the volume contained in the pump body. - The flow rate per hour, determined by a delay system integrated in a pneumatic or electropneumatic control device installed in a cabinet or controller is equal to the number of cycles per hour multiplied by that volume. - The pump has only one moving part and wear: the sleeve elastically ductile. - This pump uses only compressed gas, such as compressed air, as a power source and therefore is explosion-proof in nature.

- In accordance with the conditions of use of the pump, the air under pressure in the pump body can vary from 1 at 10 bars. - Faults in this pump are very rare. To protect the sleeve valve diaphragm as much as possible against wear, a strainer or screen can be placed in front of the passage opening of the valve inlet. - The pump does not require lubrication, gasket, motors, seals or floats. - The pump is perfectly airtight, which prevents contamination. - The replacement of the ductile membrane is easy. - The price of this pump is small compared to the other pumps for leachates or contaminated liquids. - This pump can carry any type of liquid including leachates, contaminated liquids, muddy liquids and liquids loaded with chloride. - Chloride deposits in the pump do not impede its operation.

- Maintenance of the pump is easy and economical. - The consumption of compressed air depends on the conditions of use. - The pump operates discontinuously and can, thanks to a level control device, stop working at a given level of leachates or contaminated liquids in the well.

Claims (1)

1. CLAIMS A pneumatic control device for a liquid that operates discontinuously and submerged, and with compressed gas, intended to pump liquids such as leachates from landfills, comprising a tubular body (1) that forms a pump body and that defines a cylindrical main chamber (2) at the ends of which upstream and downstream, respectively, arise an inlet (5) and an outlet (6) for the liquid to be pumped, characterized in that the pneumatic device comprises a valve of sleeve (7) positioned in front of the inlet (5) to control the passage of liquid to be pumped through said orifice, a device (8) to control the opening and closing of the sleeve valve with a compressed gas, a supply pipe (9) passing through the outlet hole and extending inside the tubular body over the main part of its length, and devices (10 / to supply gas com primed to the main chamber. A compliance device cor. claim 1, characterized in that the tubular body (1) consists essentially of a tube closed at both ends, the end upstream and the end downstream, respectively, with a bottom plate (31) and a plate upper (41) while the space between both plates forms the main chamber (2) of the pumping device, the entrance hole of the main chamber is formed in the lower section of the tubular body, consiaerated in the position of use of the device according to the present invention, and the salic device is placed in an upper section of said tubular body. A device according to claim 1. 1 or 2, characterized in that the material of the tubular body (1) of the pump is selected such that the body can be protected by an anticorrosive coating, preventing oxidations and chloride deposits. A device according to one of claims 1 to 3, characterized in that the inlet (5) of the main chamber is located in the lower plate of the tubular body and the outlet orifice (6) is located in the plate higher. A device according to one of claims 1 to 4, characterized in that the sleeve valve (7) consists of a tubular body forming a secondary chamber at the ends of which upstream and downstream arise, at each end , at least one opening (13.5 for the passage of liquid to be pumped, where these openings of passage are connected together through an elastically ductile sleeve (14) which constitutes a channel through which the liquid to be pumped must flow to penetrate into the main chamber of the pumping device. A device according to any of claims 1 to 5, characterized in that the tubular body (1) of the pump, the plates (31, 41) and the sleeve valve (7) are made of materials resistant to thick materials, contaminated liquids, liquids with salts, and liquids whose temperatures can reach more than 80 ° C. A device according to any of claims 1 to 6, characterized in that the inlet hole (5) of the main chamber (2) and the sleeve (14) of the sleeve valve are positioned coaxially with respect to the axis of the tubular body. . A device according to any of claims 1 to 6, characterized in that the space (12) surrounding the passage channel of the sleeve valve is connected through a pipe (8) integral with the tubular body to a source of supply of compressed gas. A device according to any of claims 1 to 8, characterized in that the pipeline supply (9) is equipped with a return valve. A device according to any of claims 1 to 9, characterized in that at least one of the pipes between the supply line (9), the compressed gas supply line (10) of the main chamber (2) and the The compressed gas supply pipe (15) of the secondary chamber (12) does not protrude from the wall of the pump body. O l / S i 24 SUMMARY OF THE INVENTION The invention relates to a pneumatic pump device for pumping liquids such as leaches from landfills and contaminated liquids or contaminated thick matter. The device comprises a tubular body (1) which forms a pump body and which defines a cylindrical main chamber (2) at the upstream and downstream ends from which, respectively, an inlet (3) and an outlet (4) emerge. ) for the liquid to be pumped. The pneumatic device further comprises a sleeve valve (7) positioned in front of the inlet to control the passage of the liquid to be pumped through said orifice, means (8) for controlling the opening and closing of the sleeve valve with a compressed gas, a supply tube (9) passing through the outlet and extending into the tubular body over most of its length, and means (10) for supplying compressed gas to the main chamber.