CN212646686U - Coal-fired power plant fly ash leaching test device - Google Patents

Abstract

The utility model discloses a coal-fired power plant fly ash leaching test device, which comprises a device main body, a spraying system and a filling clapboard; the device main body is a cuboid structure which is hollow inside and is provided with an opening at the top; spray heads of a spraying system are uniformly distributed above the top opening of the device main body; sampling pipes are uniformly distributed on the side wall of the device main body; the sampling pipe is arranged from inside to outside and is inclined downwards; a ball valve is arranged on the sampling pipe at the outer side of the device main body; sampling holes are uniformly distributed on the side wall of the top of the sampling pipe in the device main body; the filling partition plate is vertically and movably inserted in the device main body in a split mode. Has the advantages that: harmful substances such as heavy metals in the simulated fly ash gradually permeate to the lower soil along with the percolate, and the collection of horizontal and vertical permeation samples is carried out through a special percolate collecting device and a soil sampling hole, so that a leaching toxicity test is carried out, and a basis is provided for subsequent fly ash toxicity modification and large-scale comprehensive utilization.

Description

Coal-fired power plant fly ash leaching test device

The technical field is as follows:

the utility model relates to an experimental apparatus especially relates to a coal fired power plant fly ash leaching test device.

Background art:

the most main solid waste-fly ash generated by coal-fired power plants in China is about 6 hundred million tons, but the average comprehensive utilization rate of the fly ash is only less than 70 percent, and about 2 hundred million tons of fly ash are accumulated in an ash yard every year. Pollutants such as heavy metals carried by the stacked fly ash can cause damage to the soil and underground water through infiltration, so that the protection measures such as seepage prevention and the like need to be added for the stacking of an ash yard, and meanwhile, the stacked fly ash also causes waste of fly ash resources.

In order to apply the fly ash to soil improvement or landfill, the form and content of harmful substances in the fly ash are first detected to evaluate the risk of the harmful substances to soil and underground water after soil improvement, and appropriate measures for controlling or removing the harmful substances are taken. However, the existing implemented relevant standards, such as analysis methods (atomic absorption spectrophotometry) for arsenic, pick, chromium, copper, nickel, lead, zinc and zinc in DL/T867-2004 fly ash, and HJ/T299-2007 solid waste-leaching toxicity leaching method-sulfuric acid-nitric acid method, only specify and standardize how to detect the heavy metal content in fly ash and how to extract the leachate in the sample, and do not specify how to perform leaching tests of fly ash and related experimental facilities. Meanwhile, due to the harmfulness of the fly ash, the requirements of environmental protection in various places do not allow the on-site fly ash leaching experiment to be directly carried out on the soil without seepage prevention, so that the harm of the fly ash to the soil cannot be directly evaluated. The existing coal ash leaching experimental device is only limited to small simple platforms which are built by great colleges and universities and scientific research institutions, a device for collecting leachate is not specially arranged, and the migration of various substances in the coal ash is limited due to the small platforms, so that the obtained data has obvious limitation.

Fertile industry university has built the migration simulation experimental apparatus of heavy metal in fly ash reclamation soil, and experimental apparatus includes: water inlet, water distribution layer, water distribution plate, leaching layer, water outlet plate and water outlet. The device size is 120cm 60cm, and the device material is the organic glass board, and this facility device only separates out the heavy metal in the soil that will mix with fly ash through the eluviation to collect aquatic and detect again, thereby estimate the influence of heavy metal to water sample and soil. Because the original sample is a soil and fly ash sample which is mixed in advance, the migration process of heavy metals in the fly ash to the soil cannot be simulated. The method comprises the following steps: study on leaching experiments of heavy metal elements in Zhangqing fly ash reclaimed soil [ D ]. fertilizer combination: 2017, combined fertilizer industry university.

The utility model has the following contents:

an object of the utility model is to provide a thereby can replace fly ash landfill on the spot and filtration avoid causing actual environmental risk, can carry out the experimental operation that relapses according to the soil environment in different areas again to obtain the coal fired power plant fly ash leaching test device of extensive various basic data.

The utility model discloses by following technical scheme implement: the coal-fired power plant fly ash leaching test device comprises a device main body, a spraying system and a filling partition plate; the device main body is of a cuboid structure which is hollow inside and is provided with an opening at the top; spray headers of the spray system are uniformly distributed above the top opening of the device main body; sampling pipes are uniformly distributed on the side wall of the device main body; the sampling pipe is arranged from inside to outside and is inclined downwards; a ball valve is arranged on the sampling pipe on the outer side of the device main body; sampling holes are uniformly distributed on the side wall of the top of the sampling pipe in the device main body; the filling partition plate is movably inserted in the device main body in a split mode.

Preferably, the sampling pipes comprise a cross-flow sampling pipe and a vertical infiltration sampling pipe which are distributed from top to bottom; the number of the vertical seepage sampling pipes is one to five, and each layer of the transverse flow sampling pipes is uniformly distributed on the side wall of the device main body; the vertical infiltration sampling pipes are one to five layers, and each layer of vertical infiltration sampling pipes are uniformly distributed on the side wall of the device main body.

Preferably, the sampling tube is hermetically inserted on the side wall of the device body.

Preferably, experimental soil is filled at the bottom of the inner cavity of the device main body, the vertical infiltration sampling tube is arranged in the experimental soil at the bottom, the filling partition plate is inserted into the experimental soil at the bottom, and the inner cavity of the device main body above the experimental soil at the bottom is divided into a fly ash filling cavity and an upper soil filling cavity by the filling partition plate; and the fly ash filling cavity is filled with fly ash, and the upper soil filling cavity is filled with upper experimental soil.

Preferably, the spraying system comprises a water storage tank, a water pump and the spraying head; the water inlet of the water pump is communicated with the water storage tank through a pipeline; and the water outlet of the water pump is communicated with the spray header through a pipeline.

The utility model has the advantages that: the utility model discloses a build and to carry out fly ash leaching experimental apparatus, overhead sprinkler system, through the rainfall of simulation reality, harmful substance such as heavy metal permeates lower floor's soil gradually along with filtration liquid in the simulation fly ash, and carry out the collection of horizontal, vertical infiltration sample through special filtration liquid collection device and soil sampling hole, carry out and leach toxicity test, aassessment fly ash is to the environmental risk of soil and groundwater, provide the basis for subsequent fly ash toxicity modification and extensive comprehensive utilization, aassessment power plant's fly ash is to the environmental risk of local soil and groundwater; and can simulate the soil environment of different areas to carry out experimental operation, thereby obtaining wide and various basic data.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a side view of fig. 1.

FIG. 3 is a schematic view of the structure of a sampling tube.

FIG. 4 is a schematic diagram of fly ash and experimental soil fill.

FIG. 5 is a schematic diagram of the completion of the filling of fly ash and experimental soil.

The specific implementation mode is as follows:

example (b): as shown in fig. 1 and 2, the coal-fired power plant fly ash leaching test device comprises a device main body 1, a spraying system 2 and a filling partition plate 3; the device main body 1 is a cuboid structure which is hollow inside and is provided with an opening at the top; the spraying system 2 comprises a water storage tank 21, a water pump 22 and a spraying head 23; the water inlet of the water pump 22 is communicated with the water storage tank 21 through a pipeline; a water outlet of the water pump 22 is communicated with the spray header 23 through a pipeline, and the spray headers 23 are uniformly distributed above the top opening of the device main body 1; sampling pipes 4 are uniformly distributed on the side wall of the device main body 1; the sampling pipe 4 is arranged from inside to outside and is inclined downwards; a ball valve 5 is movably arranged on the orifice of the sampling tube 4 at the outer side of the device main body 1; as shown in fig. 3, sampling holes 6 are uniformly distributed on the side wall of the top of the sampling tube 4 in the device main body 1; the sampling tube 4 comprises a cross flow sampling tube 41 and a vertical infiltration sampling tube 42 which are distributed from top to bottom; the transverse flow sampling pipes 41 are two layers, each layer of transverse flow sampling pipes 41 are uniformly distributed on the opposite side walls of the device main body 1, and the transverse flow sampling pipes 41 which are adjacent up and down are arranged in a staggered manner; the vertical infiltration sampling pipes 42 are arranged in one layer, and each layer of vertical infiltration sampling pipes 42 are uniformly distributed on the side wall of the device main body 1; a filling partition plate 3 is vertically and movably inserted in the device main body 1 in a split mode.

Instructions for use:

preparation of the experiment: as shown in fig. 4, the device body 1 is filled with bottom experimental soil 7 until the bottom experimental soil 7 covers the vertical infiltration sampling tube 42, the filling partition plate 3 is inserted to divide the inner cavity of the device body 1 above the bottom experimental soil into a fly ash filling cavity 11 and an upper soil filling cavity 12, and then fly ash 8 and upper experimental soil 9 are correspondingly filled into the fly ash filling cavity 11 and the upper soil filling cavity 12 respectively; until the filled fly ash 8 and the experimental soil 9 above cover the transverse flow sampling pipe 41; as shown in fig. 5, after the fly ash 8 and the test soil 9 are filled, the filling spacer 3 is taken out from the apparatus main body 1.

Starting the experiment; the spraying system 2 is opened to simulate actual rainfall, the ball valves 5 on the sampling pipes 4 at different positions are opened to collect percolate samples, the ball valves 5 can be detached to collect soil samples, the samples are collected, a leaching toxicity test is carried out, the environmental risk of the fly ash to the soil and the underground water is evaluated, a basis is provided for subsequent fly ash toxicity modification and large-scale comprehensive utilization, and the environmental risk of the fly ash of the power plant to the local soil and the underground water is evaluated.

Wherein, sampling pipe 4 sets up to sealed grafting on device main part 1 lateral wall, when convenient simulation soil environment in different areas, fills, clears up experiment soil and fly ash.

Claims (6)

1. The coal-fired power plant fly ash leaching test device is characterized by comprising a device main body, a spraying system and a filling partition plate; the device main body is of a cuboid structure which is hollow inside and is provided with an opening at the top; spray headers of the spray system are uniformly distributed above the top opening of the device main body; sampling pipes are uniformly distributed on the side wall of the device main body; the sampling pipe is arranged from inside to outside and is inclined downwards; a ball valve is movably arranged on the pipe orifice of the sampling pipe on the outer side of the device main body; sampling holes are uniformly distributed on the side wall of the top of the sampling pipe in the device main body; the filling partition plate is movably inserted in the device main body in a split mode.

2. The coal-fired power plant fly ash leaching test device of claim 1, wherein the sampling pipes comprise a cross flow sampling pipe and a vertical seepage sampling pipe which are distributed from top to bottom; the number of the vertical seepage sampling pipes is one to five, and each layer of the transverse flow sampling pipes is uniformly distributed on the side wall of the device main body; the vertical infiltration sampling pipes are one to five layers, and each layer of vertical infiltration sampling pipes are uniformly distributed on the side wall of the device main body.

3. The coal fired power plant fly ash leaching test device of claim 2, wherein the sampling pipe is hermetically inserted on the side wall of the device body.

4. The coal-fired power plant fly ash leaching test device according to any one of claims 2 or 3, wherein experimental soil is filled at the bottom of the inner cavity of the device main body, the vertical seepage sampling pipe is arranged in the experimental soil at the bottom, the filling partition plate is inserted into the experimental soil at the bottom, and the filling partition plate divides the inner cavity of the device main body above the experimental soil at the bottom into a fly ash filling cavity and an upper soil filling cavity; and the fly ash filling cavity is filled with fly ash, and the upper soil filling cavity is filled with upper experimental soil.

5. The coal fired power plant fly ash leaching test device according to any one of claims 1 to 3, wherein the spraying system comprises a water storage tank, a water pump and the spray header; the water inlet of the water pump is communicated with the water storage tank through a pipeline; and the water outlet of the water pump is communicated with the spray header through a pipeline.

6. The coal fired power plant fly ash leaching test device of claim 4, wherein the spraying system comprises a water storage tank, a water pump and the spray header; the water inlet of the water pump is communicated with the water storage tank through a pipeline; and the water outlet of the water pump is communicated with the spray header through a pipeline.

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