Sintered brick made from watercourse sludge and peat, sintering and waste gas purifying system, and sintering and waste gas purifying method

Abstract

The invention discloses a sintered brick from watercourse sludge and peat, a sintering and waste gas purifying system, and a sintering and waste gas purifying method. The water content of a green bodyof the sintered brick is 12-18%. Based on dry basis, the green body comprises, by weight, 60-75% of the watercourse sludge, 8-20% of earth under buildings and 15-22% of the municipal peat. The systemcomprises a drying kiln, a dry flue gas purifying device, a calcining kiln and a calcined flue gas purifying device. The drying kiln is connected with the dry flue gas purifying device and the calcining kiln, and the calcined flue gas purifying device is connected with the calcining kiln. The method includes a purification step for calcining kiln flue gases and a purification step for drying kilnflue gases. Solid waste including the watercourse sludge and the municipal peat is fully utilized for producing building materials, the municipal peat is used as sintering fuel, and accordingly, energy conservation and environmental protection are achieved; the sintered brick has low cost and high quality, and treated waste gases meet the national emission standards.

Description

technical field

[0001] The invention relates to the technical field of municipal sludge resource utilization, in particular to a sintered brick prepared from river sludge and sludge charcoal, a firing and waste gas purification system and method. Background technique

[0002] River silt and municipal sludge are the main sources of solid waste in modern cities. Especially in developed areas, the amount of production is huge. If it is not handled properly, it will cause serious harm, devour valuable land resources, and cause environmental pollution. But it is also a renewable resource.

[0003] River silt is a solid waste produced during river dredging, containing 1-5% organic matter, most of which are clay, but containing 0-1g / kg of heavy metals copper, zinc, chromium, lead, mercury, arsenic, cadmium Wait. Therefore, its wide application is limited. The current river silt resource utilization has the following types:

[0004] 1. The methods of "directly landfilling nearb...

Examples

Embodiment 1

[0047] The firing of the sintered brick prepared by river silt and sludge charcoal of the present invention and the embodiment of waste gas purification system are as follows figure 1 , figure 2 As shown, the system includes a drying kiln, a drying tail gas purification device, a roasting kiln and a roasting flue gas purification device. The drying kiln is respectively connected with the drying tail gas purification device and the roasting kiln. The kiln is roasted to form sintered bricks; the drying tail gas purification device is used to purify the high-humidity tail gas discharged from the drying kiln; the roasting flue gas purification device is connected with the roasting kiln to purify the waste gas discharged from the roasting kiln.

[0048] In this embodiment, the dry tail gas purification device is a biological filter, and the biological filter is connected to the pipeline for discharging the purified tail gas; the temperature of the high-humidity tail gas is 40-45°C...

Embodiment 2

[0073] The structure and temperature control points of embodiment 2 of the firing of sintered bricks prepared by river silt and sludge charcoal and the waste gas purification system of the present invention are the same as embodiment 1, and the method steps are also the same, and the ingredients are different. The specific process is as follows:

[0074] After drying 1000t of river sludge with a water content of 30%, 853.66t of semi-dry river sludge with a water content of 18%, 200t of municipal sludge charcoal with an ash content of 75%, and 100t of soil excavated under a building with a water content of 10% were evenly mixed to obtain a water content 1153.66t of 14.2% mud, aged for 2 days, pressed and cut into bricks, the moisture content of the bricks is 14.2%, the ingredients and weight ratio in the bricks are calculated on a dry basis: river silt 70.7%; Excavated soil is 9.1%; municipal sludge charcoal is 20.2%, and the brick embryos are fired to form sintered bricks.

[...

Embodiment 3

[0095] The structure and temperature control points of Embodiment 3 of the firing of sintered bricks prepared by river silt and sludge charcoal and the exhaust gas purification system of the present invention are the same as Embodiment 1, and the method steps are also the same, and the ingredients are different. The specific process is as follows:

[0096] After drying 1000t of river sludge with a water content of 30%, 853.66t of semi-dry river sludge with a water content of 18%, 200t of municipal sludge charcoal with an ash content of 80%, and excavated soil under construction with a water content of 10% were uniformly mixed to obtain a water content 1153.66t of 14.2% mud, aged for 2 days, pressed and cut into bricks, the moisture content of the bricks is 14.2%, the ingredients and weight ratio in the bricks are calculated on a dry basis: river silt 70.7%; Excavated soil is 9.1%; municipal sludge charcoal is 20.2%, and the brick embryos are fired to form sintered bricks.

[0...

technical field

[0001] The invention relates to the technical field of municipal sludge resource utilization, in particular to a sintered brick prepared from river sludge and sludge charcoal, a firing and waste gas purification system and method. Background technique

[0002] River silt and municipal sludge are the main sources of solid waste in modern cities. Especially in developed areas, the amount of production is huge. If it is not handled properly, it will cause serious harm, devour valuable land resources, and cause environmental pollution. But it is also a renewable resource.

[0003] River silt is a solid waste produced during river dredging, containing 1-5% organic matter, most of which are clay, but containing 0-1g / kg of heavy metals copper, zinc, chromium, lead, mercury, arsenic, cadmium Wait. Therefore, its wide application is limited. The current river silt resource utilization has the following types:

[0004] 1. The methods of "directly landfilling nearb...

Examples

Embodiment 1

[0047] The firing of the sintered brick prepared by river silt and sludge charcoal of the present invention and the embodiment of waste gas purification system are as follows figure 1 , figure 2 As shown, the system includes a drying kiln, a drying tail gas purification device, a roasting kiln and a roasting flue gas purification device. The drying kiln is respectively connected with the drying tail gas purification device and the roasting kiln. The kiln is roasted to form sintered bricks; the drying tail gas purification device is used to purify the high-humidity tail gas discharged from the drying kiln; the roasting flue gas purification device is connected with the roasting kiln to purify the waste gas discharged from the roasting kiln.

[0048] In this embodiment, the dry tail gas purification device is a biological filter, and the biological filter is connected to the pipeline for discharging the purified tail gas; the temperature of the high-humidity tail gas is 40-45°C...

Embodiment 2

[0073] The structure and temperature control points of embodiment 2 of the firing of sintered bricks prepared by river silt and sludge charcoal and the waste gas purification system of the present invention are the same as embodiment 1, and the method steps are also the same, and the ingredients are different. The specific process is as follows:

[0074] After drying 1000t of river sludge with a water content of 30%, 853.66t of semi-dry river sludge with a water content of 18%, 200t of municipal sludge charcoal with an ash content of 75%, and 100t of soil excavated under a building with a water content of 10% were evenly mixed to obtain a water content 1153.66t of 14.2% mud, aged for 2 days, pressed and cut into bricks, the moisture content of the bricks is 14.2%, the ingredients and weight ratio in the bricks are calculated on a dry basis: river silt 70.7%; Excavated soil is 9.1%; municipal sludge charcoal is 20.2%, and the brick embryos are fired to form sintered bricks.

[...

Embodiment 3

[0095] The structure and temperature control points of Embodiment 3 of the firing of sintered bricks prepared by river silt and sludge charcoal and the exhaust gas purification system of the present invention are the same as Embodiment 1, and the method steps are also the same, and the ingredients are different. The specific process is as follows:

[0096] After drying 1000t of river sludge with a water content of 30%, 853.66t of semi-dry river sludge with a water content of 18%, 200t of municipal sludge charcoal with an ash content of 80%, and excavated soil under construction with a water content of 10% were uniformly mixed to obtain a water content 1153.66t of 14.2% mud, aged for 2 days, pressed and cut into bricks, the moisture content of the bricks is 14.2%, the ingredients and weight ratio in the bricks are calculated on a dry basis: river silt 70.7%; Excavated soil is 9.1%; municipal sludge charcoal is 20.2%, and the brick embryos are fired to form sintered bricks.

[0...

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