CN1512127A - Tail gas treating system for cement rotary kiln - Google Patents

Abstract

The tail gas treating system for rotary cement kiln includes preheating pre-decomposing apparatus, high temperature blower, flow divider, automatic regulator, powder separator, etc. The tail gas exhausted from the preheating pre-decomposing apparatus is fed completely to the flow divider with the high temperature blower; the flow divider separates the waste gas into several paths to raw material preparing apparatus and stoving apparatus separately; the automatic regulator regulates the balance between several branches; and the waste gas after being used in stoving is purified with the deduster in the system before being exhausted. Omitting humidifier, electric deduster, hot blast furnace, etc. makes the present invention possess the features of greatly reduced waste gas exhaust, high yield, low power consumption, saving in power, low cost, etc.

Description

A kind of cement rotary kiln kiln tail gas treatment system

One, technical field

The present invention is a kind of treatment system that is used for the cement rotary kiln kiln tail gas.

Two, background technology

Cement manufacturing industry is the important industry that causes air environmental pollution, to the pollution of atmosphere mainly based on dust pollution.More and more higher along with environmental protection requirement, also more and more stricter to the restriction of cement manufacturing industry dust emission.In cement production enterprise, rotary kiln waste gas is maximum pollution sources, accounts for more than 50% of enterprise's toxic emission total amount, and therefore the improvement to the cement rotary kiln kiln tail gas is the key link of factory environmental protection.At present, domestic and international processing to kiln tail gas is that kiln tail gas directly is disposed in the atmosphere after the cleaner dedusting.Cleaner is generally selected cyclone dust collectors for use, or sack cleaner, or electric cleaner.Cyclone dust collectors are limited by efficiency of dust collection, can't reach emission request; Sack cleaner is relatively poor to the higher moisture content adaptability of kiln tail gas, and burns out filter bag easily, and not only investment is big but also the operating maintenance expense is higher; Electric cleaner is subjected to the influence of the contained dust specific resistance value of kiln tail gas, and conditioning Tower must be set, and to reduce the ratio resistance value of dust, not only investment is big, operating maintenance expense height, and CO explosion accident, dangerous easily takes place.Therefore, existing cement rotary kiln kiln tail gas processing mode is not all started with from technical process itself, does not touch the basic of pollution, not only can not eliminate kiln tail gas well and pollute, obtains satisfied effect, can not reduce enterprise's exhaust gas discharging total amount.In addition, cement manufacturing industry is again the high energy consumption industry, and cutting down the consumption of energy is the key research projects of cement production enterprise, and the temperature of cement rotary kiln kiln tail gas is higher, has taken away a large amount of heat energy, does not obtain recycling.

Three, summary of the invention

The objective of the invention is provides a kind of cement rotary kiln kiln tail gas treatment system for cement production enterprise; it can reduce enterprise's exhaust gas discharging total amount in a large number; kiln tail gas is polluted to be effectively controlled; and the heat energy of kiln tail gas also is fully used; reduce the energy resource consumption of manufacture of cement, have the discharge amount of exhaust gas that reduces cement production enterprise, effectively administer exhaust emission, protect atmospheric environment, make full use of the kiln tail gas waste heat, reduce characteristics such as energy resource consumption, small investment, the production cost of manufacture of cement is low.

For achieving the above object, the technical scheme that the present invention takes is:

The present invention changes the flow process of kiln tail gas, kiln tail gas is all caused raw material preparation system and former, combustion, material drying system, utilize the thermal source of the waste heat of waste gas as oven dry, not directly externally discharging realizes that cement rotary kiln does not have the waste gas calcining, has reduced the toxic emission total amount of cement production enterprise widely, reduced pollution to atmospheric environment, and make full use of the waste heat of kiln tail gas, reduced the energy resource consumption of manufacture of cement, energy savings; Adapt with the kiln tail gas amount of handling, changed the control parameter of traditional raw grinding and former, combustion, material oven dry, system throughput is increased substantially, power consumption is also reduced significantly.

The present invention is provided with preheating predecomposition equipment, high-temperature blower, current divider, self-checking device, powder separator and pipeline, valve etc., and preheating predecomposition equipment is close phase heat exchange preheating predecomposition equipment.Preheating predecomposition equipment is communicated with high-temperature blower, and high-temperature blower is communicated with current divider, and current divider and raw material preparation system and former, combustion, material drying system are communicated with, and self-checking device is housed; Set up the powder separator and utilize raw material preparation system and former, combustion, the original dust arrester of material drying system at the mill tail of traditional raw material preparation system, the purpose of setting up the powder separator is the parameter of regulating raw grinding control.

The cement rotary kiln kiln tail gas enters high-temperature blower from preheating predecomposition equipment, enter current divider by high-temperature blower, current divider is divided into kiln tail gas and is no less than two the tunnel and (is generally two to four the tunnel, according to the concrete condition of factory and different) go into raw material preparation system and former, combustion, material drying system respectively as thermal source, raw material and former, combustion, material are dried, finish after the oven dry operation by raw material preparation system and former, combustion, the original deduster purified treatment of material drying system, enter atmosphere by exhaust blower then.Self-checking device carries out auto-control to the waste gas that enters raw material preparation system and former, combustion, material drying system, eliminates the influence of each arm working conditions change to total wind path.

Self-checking device is made up of cyclelog, pressure sensor, flow sensor etc., pressure sensor, flow sensor etc. are arranged on the appropriate location of raw material preparation system and former, combustion, material drying system, pressure sensor, flow sensor connect with cyclelog, and the closing valve that has in cyclelog and current divider, raw material preparation system and former, combustion, the material drying system connects.Pressure sensor, flow sensor are with the pressure signal and the flow signal input program controller of raw material preparation system, former, combustion, material drying system, by the closing valve that has in cyclelog control current divider, raw material preparation system and former, combustion, the material drying system, regulate the pressure and the exhaust gas flow of raw material preparation system and former, combustion, material drying system automatically.

Because the present invention all extracts and enters the waste gas that cement rotary kiln kiln tail enters preheating predecomposition equipment out current divider by high-temperature blower, enter raw material preparation system and former, combustion, material drying system respectively by the current divider demultiplexing, the kiln tail gas of first cement rotary kiln does not directly enter atmosphere, the discharge amount of exhaust gas of cement production enterprise is significantly reduced (reducing half approximately), thereby alleviated the environmental pollution of factory greatly atmosphere; The 2nd, the waste heat that utilizes kiln tail gas is dried raw material, former, combustion, material, has saved a large amount of energy; The 3rd, saved the exhaust-gas treatment facilities and the chimney such as conditioning Tower, cottrell of former cement rotary kiln kiln tail, and raw material preparation system and hot-blast stove former, the combustible material drying system, save investment, reduced production cost, the 4th, changed the control parameter of traditional raw grinding and former, combustion, material drying system, make that each system throughput increases substantially, power consumption reduces significantly.Therefore; the present invention has and significantly reduces the cement production enterprise discharge amount of exhaust gas, effectively reduces environmental pollution, the protection atmospheric environment of atmosphere, makes full use of kiln tail waste heat, greatly reduces the energy resource consumption of manufacture of cement, energy savings; reduce equipment investment, characteristics such as small investment, production cost are low.

Four, description of drawings

Accompanying drawing is a system schematic of the present invention.

Among the figure: 1 for preheating predecomposition equipment, 2 be high-temperature blower, 3 for current divider, 4 for self-checking device, 5 for the raw mill of raw material preparation system, 6 dryers for former, combustion, material drying system, 7 for powder separator, 8 be that deduster, 9 is an exhaust blower

Among the figure:---exhaust-gas flow line---self-checking device control line

---------holding wire

Five, specific embodiments

Accompanying drawing is an an example of the present invention, the present invention includes preheating predecomposition equipment (1), high-temperature blower (2), current divider (3), self-checking device (4), powder separator (7), has reached compositions such as pipeline, valve.Preheating predecomposition equipment (1) is the outlet of cement rotary kiln kiln tail gas, be communicated with high-temperature blower (2) by pipeline, high-temperature blower (2) is communicated with current divider (3), current divider (3) is provided with three air outlets, is communicated with the raw mill (5) of a raw material system system and the dryer (6) of two raw material drying systems respectively; Self-checking device (4) is made up of cyclelog, pressure sensor, flow sensor etc., pressure sensor, flow sensor are installed in the appropriate location of raw material preparation system, raw material drying system, to collect pressure, flow signal, and the input program controller, cyclelog is controlled closing valve is arranged according to the requirement that sets in advance.

Kiln tail gas goes out preheating predecomposition equipment (1) back temperature and is controlled at about 250, by high-temperature blower (2) kiln tail gas is delivered to current divider (3), the air inlet of current divider (3) is communicated with high-temperature blower (2), current divider (3) is provided with 3 air outlets, one of them is communicated with the raw mill (5) of raw material preparation system, two are communicated with the dryer (6) of two raw material drying systems respectively in addition, the kiln tail gas of being come by high-temperature blower (2) is divided into three the tunnel under the effect of current divider (3), one the tunnel enters raw mill (5), two the tunnel respectively enter a dryer (6) in addition, thermal source as this operation is dried raw material and raw material, kiln tail gas through raw material preparation system and the original deduster of raw material drying system (8) dust removal process, is discharged by exhaust blower (9) more then then.The cyclelog of self-checking device (4) is according to the signal of pressure sensor, flow sensor and requirement is set controls automatically closing valve is respectively arranged, and realizes regulating automatically control.

Therefore, the present invention all extracts the cement rotary kiln exhaust gas discharged out by high-temperature blower (2) behind preheating predecomposition equipment (1), send into raw material preparation system and former respectively through current divider (3), combustion, the material drying system is as the oven dry thermal source, and regulate and control by self-checking device (4), kiln tail gas directly is not disposed in the atmosphere, make cement production enterprise significantly reduce discharge amount of exhaust gas, and the waste heat that makes full use of waste gas is to raw material and former, combustion, material is dried, a large amount of energy have been saved, not only saved conditioning Tower, electric cleaner and chimney etc. are huge, expensive exhaust-gas treatment facilities, also cancelled raw material preparation system, former, combustion, the hot-blast stove of material drying system, saved the equipment investment of manufacture of cement, thereby greatly reduce production cost, for manufacture of cement provides a kind of minimizing toxic emission, improve air environmental pollution, energy savings, reduce investment, the cement rotary kiln kiln tail gas treatment system that reduces production costs.

Claims (2)

1, a kind of cement rotary kiln kiln tail gas treatment system, it is characterized in that being provided with preheating predecomposition equipment (1), high-temperature blower (2), current divider (3), self-checking device (4), powder separator (7), preheating predecomposition equipment (1) is close phase heat exchange preheating predecomposition equipment; Preheating predecomposition equipment (1) is communicated with high-temperature blower (2), and high-temperature blower (2) is communicated with current divider (3), and current divider (3) and raw material preparation system and former, combustion, the material drying system is communicated with and self-checking device (4) is housed; Set up powder separator (7) at the mill tail of traditional raw material preparation system; The cement rotary kiln kiln tail gas enters high-temperature blower (2) from preheating predecomposition equipment, enter current divider (3) by high-temperature blower (2), current divider (3) is divided into kiln tail gas and is no less than two the tunnel and enters raw material preparation system and former, combustion, material drying system respectively as the oven dry thermal source, raw material and former, combustion, material are dried, finish after the oven dry operation by raw material preparation system and former, combustion, the original deduster of material drying system (8) purified treatment, enter atmosphere by exhaust blower (9) then; Self-checking device (4) carries out auto-control to the waste gas that enters raw material preparation system and former, combustion, material drying system, eliminates the influence of each arm working conditions change to total wind path.

2, according to the said cement rotary kiln kiln tail gas of claim 1 treatment system, the said self-checking device of its feature (4) is by cyclelog, pressure sensor, flow sensor is formed, pressure sensor, flow sensor is arranged on raw material preparation system and former, combustion, the appropriate location of material drying system, pressure sensor, flow sensor connects with cyclelog, cyclelog and current divider (3), raw material preparation system and former, combustion, the closing valve that has in the material drying system connects, pressure sensor, flow sensor is with raw material preparation system and former, combustion, the pressure signal of material drying system and flow signal input program controller, by cyclelog control current divider (3), raw material preparation system and former, combustion, in the material drying system closing valve arranged, regulate raw material preparation system and former automatically, combustion, the pressure of material drying system and exhaust gas flow.