Green environmental protection design of concrete batching plant!

1. overall planning and design of concrete mini batching plant

Mixing during the planning stage, should be considered the plant's overall planning, design of production line and facilities related to the General layout. In planning a new of mixing station Shi, first consider of is line of selection and the location, line of location should integrated consider terrain, and mixing car and the raw materials supply transport car in factory within of traffic grooming; second is Office District, and yan and the living quarters of planning, now, most of test and Office are design in same building floor, living quarters on independent in factory of quiet place; last consider production by needed of gravel material yard of location and the by needed area, sewage processing system of design and the location, Rainwater and sewage shunting in the plant and the collection as a whole.

Plant's overall planning should also take into account environmental issues. Early in the design, according to the area's terrain, combined with wind direction, around the enterprise type, nature of the land, rivers, lakes and other factors to avoid fugitive. At design time, you should consider special temporary redirect emissions and around the impact of the incident.

Mixing plant, hard bottom and ground should be green. Hard bottom areas are mainly aggregates yard, parking and traffic control area. At the hard end of the compound when should grade the overall design, deliberately gathered the rainwater sewage treatment center so that rain, pollution and waste, the rational use. The rest of the ground should be green. Green design is the best kind of turf and trees trees intervals of ground floor, slopes covered with turf and seeding the best low shrubs, trees and shrubs selected the best evergreen tree.

2. mixing configuration environment

Configuration of the mixing plant, first of all to consider the concrete demands of local construction market, and then determine the selection of production line. China of concrete equipment main points two big class, a is high tower type concrete mixing floor, nickname floor type mixing station, referred to "mixing floor", first in Guangdong of beads triangle City used, but number is unlikely to; recently years, with Changsha in the joint heavy section Corporation and the Fujian South Road mechanical limited in national promotion mixing floor, so, country has many city began selection mixing floor. Other is a warehouse-style mixing stations, referred to as the "mixing" of ready-mixed concrete in our country most selection of mixing station. Mixing floor and mixing station of most simple difference is production of aggregate storage material way, mixing floor of aggregate warehouse in mixer of top Department, aggregate of weighing, and feeding are in mixer of top Department completed, advantages is production energy low, production efficiency high, and reliability high, production process can free combination, especially wrapped pulp method process, on mixer of wear and the grid of moments power has is big of help, shortcomings is early investment big, accounted for to area relative larger, line of making, and installation and the debugging cycle long, host floor structure complex ; Mixing station of aggregate warehouse in ground layer, aggregate of weighing in ground layer completed, in aggregate weighing completed Hou, again by belt conveying to mixer top of Midway cylinder for production, mixing station of advantages is accounted for to area relative less, host floor structure simple, line of making, and installation and the debugging cycle short, early investment small, shortcomings is energy relative high, production efficiency not high, reliability not high, production process single. Concrete production line selection, considered from long-term investments, preferred mixing and mixing environment-mixingStand better.

Mixing plant (building) configuration:

2.1 powder silo configuration,

High and low level meter, pulse jet dust collector, spring loaded safety valve, differential pressure gauge, valve tube SAC.

Work process: in powder material high pressure pump sent Shi, normal of compression air by pulse anti-blow dust collector is responsible for filter exhaust, filter Hou of powder material by anti-blow Hou, again fell back powder material warehouse in; Dang powder material pump sent to pre set of critical height Shi, high material bit meter issued alert, then powder material pump sent personnel should stop pump material, if powder material pump sent personnel not note or not in site Shi, no stop pump material, powder material warehouse within of powder material increasingly high, warehouse within of pressure increasingly big, dang warehouse within of pressure reached pre set of critical pressure Shi, Differential pressure gauge began to work the opening size of the adjustment tube bag-valve until the valve completely closed tubes SAC, stop the pump. Spring loaded safety valve is powder silo pressure high and the powder is too high, automatically opens the layout (this is the mixing plant is often said "blowing up") to prevent damage to tank and serious accident.

2.2 attach mixer configuration

Mixers, exhaust pulse dust collector, hosts, draft, powders and aggregates.

Work process (mixing floor): aggregate said material Shi, compression air directly row to mixer within, powder material said material Shi, compression air after simple filter Hou, row to mixer within; Dang aggregate and the powder material input mixer Shi, compression air row to pulse anti-blow strong row dust collector, filter Hou of powder material directly row back mixer within; mixing completed Hou, unloading material to mixing car Shi, mixer produced negative pressure, at, mixer of host breathable mouth synchronization open, achieved pressure balance.

2.3 aggregate yards, aggregate and the line closed

Outside the yard, belt conveyor, and spray systems

Workflow: aggregate transport vehicles to transport aggregate aggregate yards, started when unloading, fogging systems will start to spray and dust the unloading area; aggregate yards, belt conveyors and host floor must be completely closed.

2.4 waste water recycling system

Sand separator, mixing tank, filter, tank, recovery clean water tank and filter

Work process: in wash car Shi, flush mixing car of mixing tube within with mixing pool of sewage mixing cleaning, slipped material oblique slot with mixing pool of sewage scour, dang mixing car of waste flush to gravel separation machine Shi, gravel separation opportunities automatically put sand and the stone cleaning clean, and separation out, again again using, gravel separation machine of sewage row to mixing pool, mixing pool of sewage also used to instead of part water, added to low grade of concrete within; mixing pool within more of sewage, row to filter pool; filter pool of sewage precipitation Hou, Water pump to recycle clean water tank, recovery clean water tank water is used to flush the site; in production when the amount is too small, or to stop production, mixing tank and filtration pools of sewage, filtering and compression to avoid condensation.

3. JGJ/T328-2014 premixed concrete production and technical specification for managing several design features;

3.1 mixing plant (building) should be used as a whole closed

Design of concrete batch plant equipment (building), a line of HGC, belt conveyor and aggregate storage yard should be a one-time total closure and package design basis package outside grid structure or simple structure can be used.

3.2 mixing plant (building) should install dust removal device

Mixing plant (building) dust mainly powder silo top, mixer in the material produced by the compressed air, powder weighing generated by compressed air and belt head frame production equipment selection, should choose a special dust, the dust belt head general contractor is a separate process, at the time of contract for additional independent article.

3.3 aggregate yards should be installed spray dust suppression devices

At configuration time, you should configure the aggregate yard spray system.

3.4 disposal of waste fresh concrete equipment

Mixing in the overall design and additional facilities, consideration should be given to the following points:

(1) sand mixing, cleaning, filtering of the separating machine and ancillary.

(2) equipped with a filter press.

(30 waste for the production of concrete.

3.5 noise

Mixing noise source, the main mixer, air compressor and cars.

When designing a mixing station, mixer noise after it has been closed, and after about 100 meters away, decay to low, no longer have to deal with; air compressor selection of screw-type air compressor with low noise; when a vehicle at the plant to minimize vehicle not working need State started.

3.6 the use of pre-wetting the sand spraying device.

3.7 setting in the factory noise and dust monitoring

4. concluding remarks

Now the design of concrete mixing station, should be in accordance with the latest environmental norms or requirements of the relevant provisions, equipment selection, as far as possible according to strict requirements to choose the proper configuration and support. Points mentioned above, meet the latest regulations and used in multiple large-scale environmental mixing, but only as a reference.