Garbage leachate treatment device

Abstract

The invention discloses a garbage leachate treatment device, comprising a device body, which is a cylindrical structure. Flue gas enters and exits the device body at left and right sides. A flue gas inlet channel is provided on the left side of the device body. The right end of the flue gas inlet channel is connected to the left end of the device body through a flue gas inlet bell mouth, and the right end of the device body is connected to the flue gas outlet channel through a flue gas outlet bell mouth. A flue gas rectifying grid perpendicular to the air inlet direction is also provided at the left port of the device body. The invention is used for the treatment of leachate in a garbage incineration plant. The flue gas at the outlet of the incinerator is used as a heat source to dry the garbage leachate. Compared with the pretreatment + biochemical + membrane treatment process commonly used for garbage leachate, the invention relies on the existing high-temperature flue gas in the garbage incineration plant, avoids the situation that the leachate concentrate is difficult to treat when the membrane process is used for treatment, and reduces the treatment cost.

Description

Technical Field

[0001] The invention relates to the technical field of landfill leachate treatment, and in particular to a landfill leachate treatment device. Background Art

[0002] As the living standards of Chinese residents gradually improve, the amount of domestic waste generated is also gradually increasing. Compared with sanitary landfill and composting treatment methods, domestic waste incineration has more obvious advantages in terms of reduction, harmlessness and resource utilization. At present, most developed countries and regions mainly use incineration to treat garbage. In recent years, my country's domestic waste treatment methods have gradually changed from landfill to incineration power generation. After 5 to 7 days of fermentation in the storage pit, the water in the garbage is leached out, and the calorific value of combustion is increased, thereby ensuring the full combustion of the garbage and increasing the power generation. The leachate generated by domestic garbage eventually enters the leachate treatment facility. At present, in waste incineration power plants, the leachate treatment process of "pretreatment + biochemical + membrane treatment" is generally adopted. After the membrane treatment process, it is discharged or recycled to meet the standards. At the same time, leachate concentrate is inevitably produced. The leachate membrane concentrate has the characteristics of complex composition, poor biodegradability, high organic matter content, high salinity, strong odor, high color and hardness, and is difficult to treat. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] The object of the present invention is to provide a landfill leachate treatment device to solve the practical problems raised in the above background technology.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a garbage leachate treatment device, comprising a device body, the device body is a cylindrical structure, smoke enters and exits the left and right sides of the device body, a smoke inlet channel is provided on the left side of the device body, the right end of the smoke inlet channel is connected to the left end of the device body through a smoke inlet bell mouth, the right end of the device body is connected to the smoke outlet channel through a smoke outlet bell mouth, a smoke rectifying grid perpendicular to the air inlet direction is also provided at the left port of the device body, a plurality of diversion and infiltration devices are provided on the inner wall of the device body, a discharge port is provided at the bottom of the right side end of the device body, the discharge port is connected to the sewage pipe, and a discharge valve is provided on the discharge port.

[0007] Furthermore, the diversion and infiltration device includes a diversion baffle, which is fixedly connected to the device body through a diversion baffle fixing member, and a plurality of wastewater spray guns are provided on the back of the diversion baffle, and the bottoms of the plurality of wastewater spray guns are connected to a conveying pipe, and the conveying pipe is connected to one end of an industrial water pipe, and an electric valve is provided on the industrial water pipe, and the conveying pipe is provided with a leachate interface.

[0008] Furthermore, the upper and lower inner walls of the device body are provided with the diversion and filtration device, and the diversion baffle arranged at the lower part of the device body forms an angle of 145° with the direction of the smoke, and the upper diversion baffle forms an angle of 45° with the direction of the smoke.

[0009] Furthermore, the lower wall of the device body is provided with an inclination angle of 10° to the right side with respect to the horizontal line.

[0010] Furthermore, an electric baffle door is provided on the smoke inlet channel.

[0011] Furthermore, an electric baffle door is provided at the interface between the smoke outlet channel and the waste incineration smoke treatment system.

[0012] Furthermore, a variable frequency fan is provided in the smoke outlet channel.

[0013] (III) Beneficial effects

[0014] The invention discloses a garbage leachate treatment device, which is used for the leachate treatment of a garbage incineration plant. The device uses the flue gas at the outlet of an incinerator as a heat source to dry the garbage leachate. Compared with the current commonly used pretreatment + biochemical + membrane treatment process for garbage leachate, the device relies on the existing high-temperature flue gas in the garbage incineration plant to avoid the situation in which the leachate concentrate is difficult to treat when using the membrane process, thereby reducing the disposal cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the diversion and filtration device of the present invention.

[0018] Legend:

[0019] Diversion and infiltration device A, device body 1, smoke inlet channel 2, smoke inlet bell mouth 3, smoke rectification grid 4, smoke outlet bell mouth 5, smoke outlet channel 6, diversion baffle 7, diversion baffle fixing 8, wastewater spray gun 9, conveying pipeline 10, electric valve 11, discharge port 12, discharge valve 13, sewage pipe 14, industrial water pipe 15. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-2 The present invention provides a technical solution: a landfill leachate treatment device, wherein the device body 1 is horizontally arranged and made of wear-resistant, corrosion-resistant and high-temperature resistant materials, and the flue gas enters from the left flue gas inlet channel 2 of the device body 1 and exits from the right flue gas outlet channel 6.

[0022] The lower part of the device body 1 is inclined at 10° and is provided with a discharge port 12 to facilitate the discharge of unreacted leachate.

[0023] The flue gas rectifying grid 4 is arranged at the inlet of the device body 1 to improve the uniformity of the flue gas.

[0024] The flue gas rectifying grid 4 is made of wear-resistant, corrosion-resistant and high-temperature resistant material, and the size of the grid holes is not less than 5×5cm.

[0025] The guide baffle 7 is made of wear-resistant, corrosion-resistant and high-temperature resistant material and is arranged above and below the device body 1. The guide baffle 7 arranged at the lower part of the device body 1 forms an angle of 145° with the direction of the smoke, and the upper part forms an angle of 45° with the direction of the smoke to reduce the falling of particles in the smoke.

[0026] The guide baffles 7 are connected by guide baffle fixing members 8 , and the guide baffle fixing members 8 are arranged at intervals so as not to affect the collection of the permeate in the device body 1 .

[0027] The flue gas of the flue gas inlet channel 2 comes from the outlet of the waste incineration boiler, and an electric damper door is provided on the flue gas inlet channel 2. A flue gas inlet bell mouth 3 is provided behind the flue gas inlet channel 2, which serves as a transition section for the flue gas to enter the device body 1 from the flue gas inlet channel 2, and improves the use effect of the flue gas rectifying grid 4. The flue gas inlet channel 2 and the flue gas inlet bell mouth 3 are made of wear-resistant, corrosion-resistant and high-temperature resistant materials, and the temperature resistance is not less than 850°C.

[0028] The flue gas from the flue gas outlet channel 6 is sent to the flue gas treatment system of waste incineration. A variable frequency fan is arranged on the flue gas outlet channel 6 to provide gravity for the flue gas of the entire reaction. The core components of the variable frequency fan need to be made of wear-resistant, corrosion-resistant and high-temperature resistant materials. A smoke outlet bell mouth 5 is arranged in front of the smoke outlet channel 6 as a transition section for the smoke to enter the smoke outlet channel 6 from the device body 1. The smoke outlet channel 6 and the smoke outlet bell mouth 5 are made of wear-resistant, corrosion-resistant and high-temperature resistant materials. An electric baffle door is arranged at the interface between the smoke outlet channel 6 and the waste incineration flue gas treatment system.

[0029] The wastewater spray gun 9 is made of wear-resistant and corrosion-resistant material, and its temperature resistance is not lower than the internal temperature of the device body 1; the wastewater spray gun 9 is arranged on the back of the guide baffle 7, and the atomized particle size is not less than 500μm; the leachate delivery pipeline 10 of the wastewater spray gun 9 is connected in parallel with the industrial water pipeline 15, and the electric valve 11 is set on the industrial water pipeline 15 to flush the wastewater spray gun 9 regularly.

[0030] The leachate transported by the leachate transport pipeline 10 is pre-treated and pressure is provided by a variable frequency transport pump.

[0031] The diameter of the discharge port 12 is not less than 10 cm and is made of wear-resistant and corrosion-resistant material. The discharge port 12 is provided with a discharge valve 13 .

[0032] The discharge valve 13 is an electric valve, which is opened regularly, and the unreacted leachate is discharged to the leachate pretreatment section through the sewage pipe 14.

[0033] The specific working principle of the present invention is as follows: after the garbage leachate is pretreated, the particulate matter is controlled at 50 mg / L, and it is delivered to the wastewater spray gun 9 through a variable frequency delivery pump, and sprayed into the high-temperature flue gas in the device body 1, and the heat of the high-temperature flue gas is used to evaporate the leachate.

[0034] The high-temperature flue gas is led to the outlet of the waste incinerator with a temperature of 800℃~850℃. After passing through the flue gas inlet channel 2, it enters the device body 1 through the transition section flue gas inlet bell mouth 3, and the uniformity of flue gas distribution is improved through the flue gas rectifying grid 4.

[0035] Under the action of the guide baffle 7, the high-temperature flue gas forms a convergent flow section in the device body 1, so that the heat is more concentrated, and the wastewater spray gun 9 arranged on the back of the guide baffle 7 sprays the leachate to this section area.

[0036] After the high-temperature flue gas completes the evaporation of the leachate, it returns to the flue gas treatment system of the waste incinerator through the flue gas outlet bell mouth 5 and the flue gas outlet channel 6.

[0037] The amount of high-temperature flue gas to be drawn in needs to be calculated based on the flue gas temperature and the amount of leachate to be treated to ensure that the leachate is completely evaporated. The flow pressure of the high-temperature flue gas is provided by the variable frequency induced draft fan after the flue gas outlet channel 6.

[0038] The bottom of the device body 1 is inclined at 10° to ensure that under special circumstances, the leachate that has not been completely evaporated will be collected at the discharge port 12, and the discharge valve 13 will be opened regularly to discharge the leachate in the pretreatment section through the sewage pipe 14 to enter the next disposal stage.

[0039] When the device body 1 is suspended, the variable frequency induced draft fan and the electric baffle doors of the smoke inlet channel 2 and the smoke outlet channel 6 are closed to block the smoke from entering the device body 1, and the electric valve 11 is started to transport industrial water through the industrial water pipeline 15 to clean the wastewater spray gun 9. The cleaned wastewater is collected and discharged from the discharge port 12 to the leachate pretreatment section.

[0040] The present invention replaces the biochemical and membrane treatment processes in conventional treatment methods, utilizes the flue gas at the outlet of the garbage incinerator as a heat source, reduces the treatment cost, and solves the problem that the membrane concentrate generated by the membrane treatment process is difficult to treat.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0043] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone, or in any appropriate combination with other aspects disclosed by the present invention.

[0044] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A landfill leachate treatment device, characterized in that: The invention comprises a device body (1) and a sewage pipe (14), wherein the device body (1) is a cylindrical structure, and smoke enters and exits the device body (1) on the left and right sides. A smoke inlet channel (2) is provided on the left side of the device body (1), and the right end of the smoke inlet channel (2) is connected to the left end of the device body (1) through a smoke inlet bell mouth (3), and the right end of the device body (1) is connected to the smoke outlet channel (6) through a smoke outlet bell mouth (5). A smoke rectifying grid (4) perpendicular to the air inlet direction is also provided at the left port of the device body (1), and a plurality of diversion and infiltration devices (A) are provided in the inner wall of the device body (1). A discharge port (12) is provided at the bottom of the right side end of the device body (1), and the discharge port (12) is connected to the sewage pipe (14). A discharge valve (13) is provided on the discharge port (12); The diversion and infiltration device (A) comprises a diversion baffle (7), the diversion baffle (7) is fixedly connected to the device body (1) through a diversion baffle fixing member (8), a plurality of wastewater spray guns (9) are arranged on the back of the diversion baffle (7), the bottoms of the plurality of wastewater spray guns (9) are connected to a delivery pipeline (10), the delivery pipeline (10) is connected to one end of an industrial water pipeline (15), an electric valve (11) is arranged on the industrial water pipeline (15), and the delivery pipeline (10) is provided with a leachate interface; The upper and lower inner walls of the device body (1) are both provided with the guide and percolation device (A), and the guide baffle (7) arranged at the lower part of the device body (1) forms an angle of 145° with the direction of the smoke, and the guide baffle (7) at the upper part forms an angle of 45° with the direction of the smoke; The lower wall of the device body (1) is provided with an inclination angle of 10° to the right side with respect to the horizontal line; Under the action of the guide baffle (7), the high-temperature flue gas forms a convergent flow section in the device body (1), thereby concentrating the heat more. The wastewater spray gun (9) arranged on the back of the guide baffle (7) sprays the leachate to this section area.

2. A landfill leachate treatment device according to claim 1, characterized in that: The smoke inlet channel (2) is provided with an electric baffle door.

3. The device for treating landfill leachate according to claim 1, characterized in that: An electric baffle door is provided at the interface between the smoke outlet channel (6) and the garbage incineration smoke treatment system.

4. The garbage leachate treatment device according to claim 1, characterized in that: A variable frequency fan is arranged in the smoke outlet channel (6).

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