A novel high-efficiency fly ash agent chelating stabilization system and chelating stabilization method thereof

Abstract

The present invention discloses a novel high-efficiency fly ash agent chelating stabilization system and a chelating stabilization method thereof, and belongs to the field of environmental protection technology. It comprises a fly ash silo, a convection contact reactor, a reagent box, a chelating agent tank, a water solvent tank and a tumbling agitator. The outlet end of the chelating agent tank and the outlet end of the water solvent tank are respectively connected to the reagent box. The reagent box is provided with a No. 1 stirring assembly for stirring the internal material of the reagent box. The discharge end of the fly ash silo and the outlet end of the reagent box are respectively connected to the convection contact reactor. The present invention first mixes the chelating agent and water in the reagent box to obtain a mixed liquid, and then contacts and reacts with the fly ash particles generated by the jet diffuser in a mist form in the convection contact reactor through an infusion pump and an atomizing nozzle to obtain a chelating precursor solidified product, and then transports it to the tumbling agitator through a spiral guide sheet for further stabilization, thereby achieving high-efficiency stabilization of the fly ash.

Description

Technical Field

[0001] The invention relates to a novel high-efficiency fly ash agent chelating stabilization system and a chelating stabilization method thereof, belonging to the technical field of environmental protection. Background Art

[0002] The improvement of my country's economy and industrialization level has promoted the continuous advancement of urbanization, and the output of various types of garbage has increased year by year. The problem of garbage disposal has become the focus of social attention. At present, the more mature garbage disposal methods include incineration, landfill, anaerobic fermentation, etc. Although incineration can achieve rapid reduction of garbage, the process will produce a large amount of fly ash rich in heavy metals, so the fly ash needs to be stabilized.

[0003] At present, the commonly used fly ash treatment technology is chemical stabilization, and common chemicals include sodium sulfide, sodium phosphate, thiourea, sodium dimethyldithiocarbamate, etc. Chemical stabilization refers to the precipitation, adsorption, encapsulation, chelation, cross-linking and other reactions between heavy metals in fly ash and organic and inorganic chemicals, thereby changing the occurrence form of heavy metals and ultimately reducing the leaching toxicity of fly ash. After the fly ash is stabilized and meets the standards, it is further transported to a specific landfill for landfill treatment. However, common industrial fly ash chelation equipment usually uses a small range of chemical spraying, and the contact area with the fly ash is small, which is prone to uneven stabilization of the fly ash. In response to the above problems, this experiment developed a new type of high-efficiency fly ash chemical chelation stabilization system to solve the above problems. Summary of the invention

[0004] The present invention aims at the technical problems mentioned in the above background technology, realizes efficient and uniform reaction between fly ash and chelating agent, significantly reduces the leaching toxicity of stabilized fly ash, has high economic and social environmental benefits, and adopts the following technical solutions to achieve:

[0005] A novel high-efficiency fly ash agent chelating stabilization system comprises a fly ash silo, a convection contact reactor, a reagent box, a chelating agent tank, a water solvent tank and a tumbling agitator. The outlet ends of the chelating agent tank and the water solvent tank are respectively connected to the reagent box. The reagent box is provided with a No. 1 stirring assembly for stirring the internal material of the reagent box. The discharge end of the fly ash silo and the outlet end of the reagent box are respectively connected to the convection contact reactor. The outlet end of the convection contact reactor is also provided with a No. 2 stirring assembly for stirring the internal material of the convection contact reactor. The bottom of the convection contact reactor is connected to the top of the tumbling agitator.

[0006] As a preferred example, a liquid level meter and an anti-moisture electric heater are provided on the side wall of the fly ash silo.

[0007] As a preferred example, the fly ash silo and the countercurrent contact reactor are connected via a No. 1 feed pipe, and a flow control valve is provided on the No. 1 feed pipe.

[0008] As a preferred example, the chelating agent tank and the medicine box are connected by a No. 2 feeding pipe, and the No. 2 feeding pipe is also connected to a sampling pump for delivering the chelating agent in the chelating agent tank into the medicine box. The water solvent tank and the medicine box are connected by a water pipe, and the water pipe is provided with a water inlet pump for delivering the water solvent in the water solvent tank into the medicine box.

[0009] As a preferred example, the No. 1 stirring assembly includes a No. 1 motor and a turbine-type stirring blade, the turbine-type stirring blade is arranged inside the medicine box, the No. 1 motor is installed on the outer wall of the medicine box, and one end of the turbine-type stirring blade is connected to the output end of the No. 1 motor on the outer wall of the medicine box through a single shaft.

[0010] As a preferred example, an infusion pump is provided on the upper part of the medicine box, the input end of the infusion pump is connected to the interior of the medicine box through a pipeline, the output end of the infusion pump is connected to an infusion tube, one end of the infusion tube passes through and extends into the interior of the convection contact reactor, and an atomizing nozzle is provided on the end of the infusion tube located inside the convection contact reactor, and a flow regulating valve is also provided on the infusion tube located outside the convection contact reactor;

[0011] One end of the No. 1 feed pipe passes through and extends into the interior of the countercurrent contact reactor, and is connected to a jet diffuser. The jet diffuser and the atomizing nozzle are staggered inside the countercurrent contact reactor, and the bottom of the atomizing nozzle corresponds to the middle of the jet diffuser.

[0012] As a preferred example, the No. 2 stirring assembly includes a spiral guide plate and a No. 2 motor, the spiral guide plate is arranged at the inner bottom of the convection contact reactor, the No. 2 motor is installed on the outer wall of the convection contact reactor, and one end of the spiral guide plate is connected to the output end of the No. 2 motor.

[0013] As a preferred example, a feed port is provided on the upper part of the tumbling agitator, and the tumbling agitator is connected with the bottom of the convection contact reactor through the feed port. A double-axis multi-tooth stirring rod is provided inside the tumbling agitator, and the double-axis multi-tooth stirring rod is connected to the No. 3 motor outside the tumbling agitator, and a discharge port is provided at the bottom of the tumbling agitator.

[0014] A chelation stabilization method proposed for a new type of high-efficiency fly ash chelation stabilization system comprises the following steps:

[0015] (a) Pump the industrial-grade mixed organic sulfur agent and water in the chelating agent tank and the water solvent tank into the agent box at a volume ratio of 1:10 and stir them thoroughly to obtain a mixed solution;

[0016] (b) The fly ash in the fly ash silo (the average leaching concentration of Pb is 44 mg / L) and the mixed liquid are respectively passed through the jet diffuser (flow rate is 40 m 3 / h) and atomizing nozzle (flow rate is 2 m 3 / h) contacting and reacting in a countercurrent contact reactor to obtain a chelating precursor solidified material;

[0017] (c) The chelated precursor solidified material was further sent to a tumbling agitator for mixing and stabilization (rotation speed was 100 rpm), and finally a fly ash stabilized product was obtained. According to the nine-point grid method sampling and measurement described in CJ / T 313-2009, the average leaching concentration of Pb was 4.14 mg / L, and the chelation rate reached 90.59%.

[0018] It should be noted that:

[0019] In (b), the fly ash is collected from the Shanghai Liming Recycling Resources Co., Ltd. domestic waste incineration plant. The incineration treatment object is the dry garbage component in the urban domestic garbage. The fly ash is mainly collected in the bag dust removal stage. The collected fly ash has the appearance of gray particles, accompanied by a small amount of grayish white and black particles.

[0020] In addition, in (b), the jet diffuser and the atomizing nozzle are staggered up and down, and the bottom of the atomizing nozzle corresponds to the middle of the jet diffuser, thereby reducing the possibility of clogging of the atomizing nozzle.

[0021] In (c), before being sent to the tumbling agitator, the chelating precursor solidified material is rotated and transported downward by the spiral guide sheet driven by the second motor, thereby achieving uniform feeding and reducing blockage.

[0022] The beneficial effects of the present invention are as follows: the present invention first mixes the chelating agent and water evenly in a reagent box to obtain a mixed liquid, and then uses an infusion pump and an atomizing nozzle to react with the fly ash particles produced by a jet diffuser in a convection contact reactor in a mist form to obtain a chelating precursor solid, and then transports it to a tumbling agitator through a spiral guide sheet for further stabilization, thereby achieving efficient stabilization of the fly ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] In the figure: 1-fly ash silo; 2-liquid level meter; 3-anti-humidity electric heater; 4-feeding pipe No. 1; 5-flow control valve; 6-convection contact reactor; 7-jet diffuser; 8-atomizing nozzle; 9-flow regulating valve; 10-infusion pipe; 11-infusion pump; 12-motor No. 1; 13-medicine box; 14-turbine stirring blade; 15-sample feeding pipe No. 2; 16-water pipe; 17-chelating agent tank; 18-sample pump; 19-water pump; 20-water solvent tank; 21-motor No. 2; 22-spiral guide plate; 23-feeding port; 24-motor No. 3; 25-double-axis multi-tooth stirring rod; 26-tumbling stirrer; 27-discharging port. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0026] like Figure 1 As shown, a novel high-efficiency fly ash agent chelating stabilization system includes a fly ash silo 1, a convection contact reactor 6, a reagent box 13, a chelating agent tank 17, a water solvent tank 20 and a tumbling agitator 26. The outlet end of the chelating agent tank 17 and the outlet end of the water solvent tank 20 are respectively connected to the reagent box 13. The reagent box 13 is provided with a No. 1 stirring component for stirring the internal material of the reagent box 13. The discharge end of the fly ash silo 1 and the outlet end of the reagent box 13 are respectively connected to the convection contact reactor 6. The outlet end of the convection contact reactor 6 is also provided with a No. 2 stirring component for stirring the internal material of the convection contact reactor 6. The bottom of the convection contact reactor 6 is connected to the top of the tumbling agitator 26.

[0027] A liquid level meter 2 and an anti-humidity electric heater 3 are provided on the side wall of the fly ash silo 1 .

[0028] The fly ash silo 1 and the countercurrent contact reactor 6 are connected via a No. 1 feed pipe 4 , and a flow control valve 5 is provided on the No. 1 feed pipe 4 .

[0029] The chelating agent tank 17 and the medicine box 13 are connected by a No. 2 feeding pipe 15, and the No. 2 feeding pipe 15 is also connected to a sampling pump 18 for delivering the chelating agent in the chelating agent tank 17 into the medicine box 13. The water solvent tank 20 and the medicine box 13 are connected by a water pipe 16, and the water pipe 16 is provided with a water inlet pump 19 for delivering the water solvent in the water solvent tank 20 into the medicine box 13.

[0030] The No. 1 stirring assembly includes a No. 1 motor 12 and a turbine-type stirring blade 14. The turbine-type stirring blade 14 is arranged inside the medicine box 13, and the No. 1 motor 12 is installed on the outer wall of the medicine box 13. One end of the turbine-type stirring blade 14 is connected to the output end of the No. 1 motor 12 on the outer wall of the medicine box 13 through a single shaft.

[0031] An infusion pump 11 is provided on the upper part of the medicine box 13. The input end of the infusion pump 11 is connected to the interior of the medicine box 13 through a pipeline. The output end of the infusion pump 11 is connected to an infusion tube 10. One end of the infusion tube 10 penetrates and extends into the interior of the convection contact reactor 6. An atomizing nozzle 8 is provided on the end of the infusion tube 10 located inside the convection contact reactor 6. A flow regulating valve 9 is also provided on the infusion tube 10 located outside the convection contact reactor 6.

[0032] One end of the No. 1 feed pipe 4 passes through and extends into the interior of the countercurrent contact reactor 6, and is connected to a jet diffuser 7. The jet diffuser 7 and the atomizing nozzle 8 are staggered inside the countercurrent contact reactor 6, and the bottom of the atomizing nozzle 8 corresponds to the middle of the jet diffuser 7.

[0033] The No. 2 stirring assembly includes a spiral guide plate 22 and a No. 2 motor 21. The spiral guide plate 22 is arranged at the inner bottom of the convection contact reactor 6, and the No. 2 motor 21 is installed on the outer wall of the convection contact reactor 6. One end of the spiral guide plate 22 is connected to the output end of the No. 2 motor 21.

[0034] A feed port 23 is provided at the top of the tumbling agitator 26, and the tumbling agitator 26 is connected to the bottom of the convection contact reactor 6 through the feed port 23. A double-axis multi-tooth stirring rod 25 is provided inside the tumbling agitator 26, and the double-axis multi-tooth stirring rod 25 is connected to the No. 3 motor 24 outside the tumbling agitator 26, and a discharge port 27 is provided at the bottom of the tumbling agitator 26.

[0035] A chelation stabilization method proposed for a new type of high-efficiency fly ash chelation stabilization system comprises the following steps:

[0036] (a) Pumping the industrial-grade mixed organic sulfur agent and water in the chelating agent tank 17 and the water solvent tank 20 into the agent box 13 at a volume ratio of 1:10 and stirring them thoroughly to obtain a mixed solution;

[0037] (b) The fly ash in fly ash silo 1 (average leaching concentration of Pb is 44 mg / L) and the mixed liquid are respectively passed through jet diffuser 7 (flow rate is 40 m 3 / h) and atomizing nozzle 8 (flow rate is 2 m 3 / h) contacting and reacting in a countercurrent contact reactor 6 to obtain a chelating precursor solidified material;

[0038] (c) The chelated precursor solidified material was further sent to the tumbling agitator 26 for mixing and stabilization (rotation speed was 100 rpm), and finally a fly ash stabilized product was obtained. According to the nine-point grid method sampling and measurement described in CJ / T 313-2009, the average leaching concentration of Pb was 4.14 mg / L, and the chelation rate reached 90.59%.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A new type of high-efficiency fly ash agent chelating stabilization system, characterized in that: The invention comprises a fly ash silo (1), a convection contact reactor (6), a reagent box (13), a chelating agent tank (17), a water solvent tank (20) and a tumbling agitator (26); the outlet end of the chelating agent tank (17) and the outlet end of the water solvent tank (20) are respectively connected to the reagent box (13); a first stirring assembly is provided on the reagent box (13) for stirring the internal material of the reagent box (13); the discharge end of the fly ash silo (1) and the outlet end of the reagent box (13) are respectively connected to the convection contact reactor (6); a second stirring assembly is further provided at the outlet end of the convection contact reactor (6) for stirring the internal material of the convection contact reactor (6); and the bottom of the convection contact reactor (6) is connected to the top of the tumbling agitator (26); An infusion pump (11) is provided on the upper part of the medicine box (13); the input end of the infusion pump (11) is connected to the interior of the medicine box (13) through a pipeline; the output end of the infusion pump (11) is connected to an infusion tube (10); one end of the infusion tube (10) penetrates and extends into the interior of the convection contact reactor (6); an atomizing nozzle (8) is provided on the end of the infusion tube (10) located inside the convection contact reactor (6); and a flow regulating valve (9) is also provided on the infusion tube (10) located outside the convection contact reactor (6); The fly ash silo (1) and the countercurrent contact reactor (6) are connected via a No. 1 feed pipe (4), and a flow control valve (5) is provided on the No. 1 feed pipe (4); One end of the No. 1 feed pipe (4) penetrates and extends into the interior of the countercurrent contact reactor (6), and is connected to a jet diffuser (7), and the jet diffuser (7) and the atomizing nozzle (8) are arranged alternately inside the countercurrent contact reactor (6), and the bottom of the atomizing nozzle (8) corresponds to the middle of the jet diffuser (7); The tumbling agitator (26) is provided with a feed inlet (23) at the top, and the tumbling agitator (26) is connected to the bottom of the countercurrent contact reactor (6) through the feed inlet (23). The tumbling agitator (26) is provided with a double-shaft multi-tooth stirring rod (25) inside, and the double-shaft multi-tooth stirring rod (25) is connected to a No. 3 motor (24) outside the tumbling agitator (26), and the bottom of the tumbling agitator (26) is provided with a discharge port (27).

2. A novel high-efficiency fly ash chelating agent stabilization system according to claim 1, characterized in that: A liquid level meter (2) and an anti-humidity electric heater (3) are provided on the side wall of the fly ash silo (1).

3. A novel high-efficiency fly ash agent chelating stabilization system according to claim 1, characterized in that: The chelating agent tank (17) and the medicine box (13) are connected via a No. 2 feeding pipe (15), and the No. 2 feeding pipe (15) is also connected to a sample injection pump (18) for feeding the chelating agent in the chelating agent tank (17) into the medicine box (13). The aqueous solvent tank (20) and the medicine box (13) are connected via a water delivery pipe (16), and the water delivery pipe (16) is provided with a water injection pump (19) for feeding the aqueous solvent in the aqueous solvent tank (20) into the medicine box (13).

4. A novel high-efficiency fly ash agent chelating stabilization system according to claim 1, characterized in that: The first stirring assembly comprises a first motor (12) and a turbine-type stirring blade (14), wherein the turbine-type stirring blade (14) is arranged inside the medicine box (13), the first motor (12) is mounted on the outer wall of the medicine box (13), and one end of the turbine-type stirring blade (14) is connected to the output end of the first motor (12) on the outer wall of the medicine box (13) via a single shaft.

5. A novel high-efficiency fly ash agent chelating stabilization system according to claim 1, characterized in that: The second stirring assembly comprises a spiral guide piece (22) and a second motor (21), wherein the spiral guide piece (22) is arranged at the inner bottom of the convection contact reactor (6), and the second motor (21) is installed on the outer wall of the convection contact reactor (6), and one end of the spiral guide piece (22) is connected to the output end of the second motor (21).

6. The chelation stabilization method proposed according to the novel high-efficiency fly ash agent chelation stabilization system according to any one of claims 1 to 5 is characterized in that: The following steps are involved: (a) pumping the industrial-grade mixed organic sulfur agent and water in the chelating agent tank (17) and the water solvent tank (20) into the agent box (13) at a volume ratio of 1:10 and stirring them thoroughly to obtain a mixed solution; (b) The average leaching concentration of Pb in the fly ash silo (1) is 44 mg / L, and the mixed liquid passes through the flow rate of 40m 3 / h jet diffuser (7) and flow rate of 2 m 3 / h atomizing nozzle (8) is used for contact reaction in a convection contact reactor (6) to obtain a chelating precursor solidified product; (c) The chelated precursor solidified material is further sent to a tumbling agitator (26) with a rotation speed of 100 rpm for mixing and stabilization, and finally a fly ash stabilized product is obtained.

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