JP4926781B2 - High moisture content waste treatment method and treatment equipment - Google Patents

Description

  The present invention relates to a method and an apparatus for treating high moisture content waste, and more particularly, when incinerating a high moisture content waste using a cement firing facility, without changing the facility capacity of the cement firing facility. By improving the clinker firing capacity, it is possible to prevent the impact on the cement firing facility associated with the incineration treatment of this high water content waste, and the high water content waste that can treat a large amount of this high water content waste The present invention relates to an object processing method and an apparatus.

Conventionally, there is dehydrated sludge discharged from sewage treatment plants as an example of high moisture content waste that contains a lot of water, and this dehydrated sludge has been treated by incineration, melting, etc. Reuse processing for effective use is promoted, and reuse processing tends to increase in the cement firing facility. Similarly, incineration ash, fly ash, and the like generated from the incineration plant are reused as cement raw materials.
For example, dehydrated sludge is introduced into a kiln bottom of a cement kiln or a calcining furnace by pipeline transportation without drying and without pretreatment with additives (patent document) 1). Also, incineration fly ash, etc. is a method in which water is washed once to remove chlorine that is harmful to the operation of the cement firing equipment, and then directly injected into the high temperature part of the cement firing equipment while maintaining a high water content ( Patent Document 2 etc.).

In general, since most dewatered sludge is water and organic matter, the amount of ash that remains when incinerated in a cement kiln or calcining furnace is very small. Therefore, it is an effective treatment method because it can be incinerated in the cement kiln without affecting the components of the cement clinker and does not produce new waste such as incinerated ash. Incinerated fly ash that has been washed with water still retains organic chlorine compounds such as dioxins even after washing. It can be incinerated, and the remaining inorganic components can be effectively used as a cement raw material.
JP 2002-52397 A JP 2001-25731 A

By the way, in the method of directly feeding the high water content waste described above to the kiln bottom of the cement kiln, evaporation of a large amount of water contained in the high water content waste reduces the temperature of the raw material in the kiln bottom of the cement kiln. , A decrease in sensible heat of the raw material heated and decarboxylated in a suspension preheater or calcining furnace, a decrease in the temperature of the zone where the cement raw material is sintered into a clinker (kiln firing zone), etc. There was a problem that the clinker might not be sufficiently fired.
In order to prevent such a decrease in temperature and sensible heat, it is necessary to perform an operation that extremely reduces the amount of cement clinker fired in the cement firing equipment. In this case, the gas intensity for firing the unit clinker is As a result, the temperature of the kiln bottom and the temperature of the exhaust gas from the suspension preheater increased, and as a result, the amount of heat for calcining and the amount of electric power used increased, making it impossible to operate economically.

In addition, when the cement clinker firing ability is extremely reduced, there is a possibility that a required amount of cement cannot be produced.
For this reason, in cement baking facilities, it is necessary to limit the amount of high water content waste, and the actual condition is that processing is performed up to about 1 to 3% with respect to the clinker baking amount.
In addition, wastes with high water content that are treated in cement firing facilities include sewage sludge and flush incinerated fly ash, as well as factory sludge, waste water, neutralized water, organic sludge, etc. It is. Therefore, it is desired that all of these high moisture content wastes be treated in the same cement firing facility, but these various high moisture content wastes are directly put into the conventional cement firing facility at the same time and incinerated. However, there is a problem that the influence on the cement firing facility is further increased, making it impossible to perform the necessary cement production.

  The present invention has been made to solve the above problems, and when incinerating waste using a cement firing facility, even if it is a high moisture content waste containing a lot of moisture, The impact on the operation of the cement firing equipment is small, it can be efficiently processed in the cement firing equipment while maintaining the cement firing capacity, and a high amount of waste with a high water content can be treated. It aims at providing the processing method and processing apparatus of a moisture content waste.

  As a result of intensive research to solve the above-mentioned problems, the inventors of the present invention widen the firing allowable range for maintaining the degree of firing of clinker in cement firing equipment, and the gas intensity for clinker firing Therefore, even when a high moisture content waste containing a large amount of moisture is directly input to the cement firing equipment, the cement clinker firing process is less affected by the evaporation of the unit moisture content in the high moisture content waste. The inventors have found that it is easy to maintain the cement clinker firing ability, and have completed the present invention.

That is, the method for treating high water content waste of the present invention comprises a suspension preheater for preheating cement raw material, a calcining furnace for calcining the preheated cement raw material, and calcining the calcined cement raw material to clinker. A cement kiln having a cement kiln and a clinker cooler for cooling the clinker, and incinerating high water content waste, wherein oxygen generated from an oxygen supply means is removed from the cement kiln. Fuel combustion is performed by mixing in either or both of the fuel combustion air and the fuel combustion air of the calciner, and oxygen generated from the oxygen supply means is mixed in the cooling air of the clinker cooler, Among the high water content waste, highly viscous high water content sludge and washing fly ash are removed from the cement kiln, the calcining furnace, and the suspension preheater. Either directly put over one plant of the data, a high water content waste low viscosity, kiln inlet section of the cement kiln, the calciner of the secondary air duct, from the upper half of the calciner The suspension preheater is directly put into any one or more of the suspension preheaters up to the cyclone and then incinerated.

In this high water content waste treatment method, per unit cement clinker to be fired by mixing oxygen into one or both of the fuel combustion air of the cement kiln of the cement firing facility and the fuel combustion air of the calciner. The amount of secondary gas collected from the clinker cooler is reduced, and the secondary air in the high temperature region is collected, making it easy to set the temperature of the clinker firing zone in the cement kiln. Thus, it becomes possible to increase the firing ability of the cement clinker.
As a result, of high water content waste, highly viscous high water content sludge and washed fly ash are directly put into one or more of cement kiln, calcining furnace and suspension preheater , and low viscosity high water content. Rate waste directly into at least one of the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the bottom cyclone of the suspension preheater And even if it incinerates after that, it becomes possible to maintain the clinker baking amount and clinker baking degree in a cement baking equipment.
In addition, since the cement clinker firing process is not easily affected by the evaporation of moisture in the high water content waste, stable cement firing equipment can be operated without deteriorating the quality of the cement.

In this high water content waste processing method, the amount of secondary air recovered from the clinker cooler is further reduced by mixing oxygen generated from the oxygen supply means into the cooling air of the clinker cooler. In addition, by adjusting the oxygen concentration, the clinker firing zone can be set to an appropriate temperature, and the firing ability of the cement clinker can be further enhanced.

  In the high water content waste processing method of the present invention, the amount of the high water content waste charged into the calcining furnace or the cement kiln is 4% by weight with respect to the clinker firing amount in the cement firing facility. As described above, it is preferably 3% by weight or more in terms of the total water content contained in the high water content waste.

This high moisture content waste treatment method is necessary for firing per cement clinker unit even when a large amount of high moisture content waste is introduced into the calciner or cement kiln as described above. The amount of gas is reduced, and the temperature of the clinker firing zone is easily increased while maintaining the cement clinker firing ability, so that the degree of firing of the cement clinker is also maintained.
This eliminates the need for a large amount of combustion gas to maintain the degree of clinker firing in the cement kiln as compared to conventional cement firing equipment, and it is possible to fire without increasing the temperature in various places in the cement firing equipment. This makes it possible to reduce the adverse effects on the operation of the cement firing facility due to the temperature rise that has occurred in the conventional cement firing facility and the shortage of the clinker firing degree in the cement kiln. Therefore, it becomes possible to increase the processing amount of the high water content waste in the cement firing facility.

In the high water content waste processing method of the present invention, the high water content waste is selected from the group of sewage sludge, factory sludge, waste water, neutralized water, organic sludge, washing incineration ash, washing fly ash. It is preferable that it is a waste which is 1 type or 2 types or more and incinerates at high temperature .

In this high water content waste treatment method, by diversifying the high water content waste, the high water content waste can be placed in the cemented area with high water content sludge and washed fly ash. At least one of kiln, calcining furnace, suspension preheater , and low viscosity, high water content waste, cement kiln kiln bottom, calcining furnace secondary air duct, calcining furnace upper half By selecting one or more points from the first to the lowermost cyclone of the suspension preheater, it is possible to select the input point according to the properties of the high water content waste. As a result, even when a large amount of high water content waste is added, the high water content waste is not concentrated in a specific part of the cement clinker firing process. The influence of evaporation of moisture inside will be dispersed. In addition, by individually setting the oxygen concentration of the fuel combustion air in the cement kiln and calcining furnace, the impact on the location where high water content waste is introduced is reduced and the quality of the cement is reduced. This makes it possible to operate a stable cement firing facility.

In the high water content waste processing method of the present invention, the clinker cooler is preferably a pendulum clinker cooler .
In this high moisture content waste treatment method, the clinker cooler is a pendulum clinker cooler , so that the oxygen concentration in the fuel combustion air of each cement kiln and calciner is set high, and the clinker production capacity of the cement calcination furnace is increased. Even when the clinker cooler is raised, the clinker cooling capacity of the clinker cooler is increased, and the produced clinker can be sufficiently cooled.

The high moisture content waste processing apparatus of the present invention includes a suspension preheater for preheating cement raw material, a calcining furnace for calcining the preheated cement raw material, and calcining the calcined cement raw material into a clinker. A device that incinerates a high water content waste using a cement firing facility including a cement kiln and a clinker cooler that cools the clinker, the fuel combustion air of the cement kiln, the fuel combustion of the calciner Oxygen is supplied to one or both of the air, and oxygen supply means for mixing into the cooling air of the clinker cooler, and among the high water content waste, highly viscous high water content sludge and washed fly ash the cement kiln, the calciner, and a supply means for introducing either directly above one plant of the suspension preheater, a low viscosity high water content waste of Directly in one or more places between the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the lowest cyclone of the suspension preheater And supply means for charging .

In the high moisture content waste processing apparatus of the present invention, oxygen is supplied to one or both of the fuel combustion air of the cement kiln and the fuel combustion air of the calciner, and is mixed into the cooling air of the clinker cooler. Of the oxygen supply means and the high water content waste, highly viscous high water content sludge and washing fly ash are directly charged into any one or more of the cement kiln, the calciner, and the suspension preheater. Supply means and low-viscosity high moisture content waste from the kiln bottom of the cement kiln, the secondary air duct of the calciner, from the upper half of the calciner to the lowermost cyclone of the suspension preheater by having the supply means to introduce one directly above one plant of between gas consumption rate per unit cement clinker is calcined is reduced, clinker Secondary air amount recovered from over La is small and moreover will be recovered secondary air high temperature range, increased ease temperature of clinker burning zone of cement kiln increases the firing capability of the cement clinker.
As a result, of high water content waste, highly viscous high water content sludge and washed fly ash are directly put into one or more of cement kiln, calcining furnace and suspension preheater , and low viscosity high water content. Rate waste directly into at least one of the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the bottom cyclone of the suspension preheater And even if it incinerates after that, it becomes possible to maintain the clinker baking amount and clinker baking degree in a cement baking equipment.
In addition, the cement clinker firing process is not easily affected by the evaporation of moisture in the waste having a high water content, and stable cement firing equipment can be operated without deteriorating the quality of the cement.

According to the processing method of the high water content waste present invention, fuel combustion air of the cement kiln of the cement burning facility, with is mixed oxygen to either or both of the fuel combustion air calciner performing fuel combustion Since oxygen generated from the oxygen supply means is mixed into the cooling air of the clinker cooler, the gas intensity per unit cement clinker to be fired can be reduced.
In addition, the amount of secondary air recovered from the clinker cooler is reduced, and secondary air in the high temperature region is recovered, so the temperature of the clinker firing zone in the cement kiln can be easily increased, and as a result, The firing ability of cement clinker can be increased.
Therefore, among high water content waste, highly viscous high water content sludge and washed fly ash are directly put into one or more of cement kiln, calciner, and suspension preheater , and low viscosity and high water content. Directly throw the waste into one or more of the cement kiln bottom, the secondary air duct of the calciner, and the upper half of the calciner to the bottom cyclone of the suspension preheater. even performing the subsequent incineration process, it is possible to easily maintain the clinker burning amount and clinker burning degree of the cement burning facility.
In addition, since the cement clinker firing process is not easily affected by the evaporation of moisture in the high water content waste, stable cement firing equipment can be operated without deteriorating the quality of the cement.

According to the high moisture content waste treatment apparatus of the present invention, oxygen is supplied to one or both of the fuel combustion air of the cement kiln and the fuel combustion air of the calciner, and is mixed into the cooling air of the clinker cooler. Oxygen supply means to be supplied, and supply means for directly feeding high-viscosity high-water content sludge and washing fly ash out of high-moisture-content waste into one or more of a cement kiln, calcining furnace, and suspension preheater, , Low-viscosity, high-moisture content waste, any one of the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the bottom cyclone of the suspension preheater supply means for introducing directly above Tokoro, since with a, it is possible to reduce the gas consumption rate per unit cement clinker is calcined.
In addition, the amount of secondary air recovered from the clinker cooler is reduced, and secondary air in the high temperature region is recovered, so the temperature of the clinker firing zone in the cement kiln can be easily increased, and as a result, The firing ability of cement clinker can be increased.

Therefore, among high water content waste, highly viscous high water content sludge and washed fly ash are directly put into one or more of cement kiln, calciner, and suspension preheater , and low viscosity and high water content. Directly throw the waste into any one or more of the area between the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the bottom cyclone of the suspension preheater, Even if it incinerates after that, the clinker baking amount and clinker baking degree in a cement baking equipment can be maintained easily.
In addition, since the cement clinker firing process is less affected by the evaporation of moisture in the high water content waste, it can stably produce a cement of a certain quality without degrading the quality of the cement, Stable operation of the cement firing facility can be performed over a long period of time.

BEST MODE FOR CARRYING OUT THE INVENTION The best mode of a high moisture content waste processing method and processing apparatus of the present invention will be described with reference to the drawings.
The present embodiment is specifically described for better understanding of the gist of the invention, and does not limit the invention unless otherwise specified.

  FIG. 1 is a schematic diagram showing a cement production facility according to an embodiment of the present invention. By providing a high water content waste treatment device at the bottom of the kiln kiln, the high water content waste is directly removed from the cement kiln. By injecting into the bottom of the kiln to incinerate, and by installing an oxygen generator that supplies oxygen to the cooling air of the clinker cooler and the primary air for fuel combustion, incinerate a large amount of high water content waste, Moreover, it is an example of a cement production facility that performs predetermined cement production.

  In the figure, 1 is a raw material mill for drying and pulverizing cement raw material, 2 is a cyclone for separating cement raw material powder, 3 is a cement raw material storage, 4 is a cement kiln, 5 is a clinker cooler, and 6a to 6c are cooling clinker coolers 5. A fan, 6d is a primary air fan for fuel combustion of the cement kiln 4, 7 is a calcining furnace, 8 is a suspension preheater composed of a plurality of cyclones 8a to 8d, 9 is a secondary air duct of the calcining furnace 7, and 10 is an electric A dust collector, 11 is an exhaust chimney, 12 is a burner, 13 is a cooler exhaust line, 14 is a cement raw material supply line, 15 is a cement raw material powder supply line, and 16 is a cement clinker conveyance line.

21 is a high moisture content organic sludge (high moisture content waste), which is an organic sludge containing a large amount of water, directly fed into the kiln bottom 4a of the cement kiln 4 (high moisture content organic sludge direct treatment apparatus (high Water content waste supply means), a storage tank 22 for storing high water content organic sludge, a pump 23 for adjusting the input amount of the high water content organic sludge to the kiln bottom 4a of the cement kiln 4; It is constituted by a high water content organic sludge supply line 24 that transports and feeds the water content organic sludge to the kiln bottom 4a of the cement kiln 4.
This pump 23 has a total processing capacity of 4% by weight or more with respect to the amount of clinker fired in the cement firing facility.

Reference numeral 31 denotes an oxygen production supply device (oxygen supply means), which includes an oxygen production device 32, a primary air oxygen supply line 33, and a clinker cooler cooling air oxygen supply line.
As the oxygen production apparatus 32, a PSA type oxygen generation apparatus, an oxygen production apparatus using a membrane separation method, an oxygen generation apparatus using a cryogenic separation method, or the like is preferably used.
In the present embodiment, it is necessary that the amount of oxygen produced is large, and it is necessary to continuously produce oxygen. On the other hand, there is no need to fluctuate the production of oxygen instantaneously. Therefore, as an oxygen production apparatus that meets these conditions, an oxygen generator by a cryogenic separation method is suitable. The oxygen production apparatus of this cryogenic separation method compresses and cools air to liquefy it, and separates it using the difference in boiling point between oxygen and nitrogen, and the obtained oxygen has a relatively high purity.

  In the present invention, since the purpose is only to increase the oxygen concentration of the fuel combustion air used for cement firing, high-purity oxygen is not necessarily required. Considering the amount of waste with high water content in the facility and the production capacity of cement clinker, it will be operated at the optimal oxygen purity. That is, if the purity of the oxygen produced by the oxygen production apparatus 32 is about 90% or more, oxygen required by the cement firing facility for carrying out the present invention can be supplied without waste.

Next, the relationship between the amount of oxygen produced, the amount of clinker produced by cement burning equipment, and the amount of high water content waste treated will be described.
When the high moisture content waste is not treated in the cement firing facility, the amount of the cement clinker that can be increased is uniquely determined by the oxygen supply amount, and if the oxygen purity is 90% or more, The oxygen supply amount per unit of cement clinker capable of increasing production is calculated to be about 180 to 200 Nm ³ / t.

On the other hand, the relationship between the high water content waste processing amount and the supplied oxygen amount when processing high water content waste with a cement firing facility is, for example, equivalent to cement clinker production capacity and 100% water content. Assuming that the high water content waste is treated, the oxygen supply amount per unit high water content waste is calculated to be about 500 to 550 Nm ³ / t.
In other words, in this cement firing facility, energy of about 2.5 to 3 times the amount of cement clinker production is required for the treatment of high water content waste.

  Oxygen generated by the oxygen production and supply device 31 is introduced into the clinker cooling air fan 6a or the primary air fan 6d flowing into the upstream chamber of the clinker cooler 5, or the clinker cooling air fan 6a and the primary air fan 6d. .

Next, a highly efficient clinker cooler that is preferably used as the clinker cooler 5 of the present embodiment will be described.
In this embodiment, even a conventional clinker cooler can sufficiently fulfill its purpose, but here, taking a high-efficiency clinker cooler as an example, a cooling mechanism for a cement clinker and cooling air are used. An oxygen supply method will be described.

The high-efficiency clinker cooler has a high cooling efficiency of a high-temperature cement clinker, can be cooled to a predetermined temperature with a small cooling area, and with a small cooling area.
The cement firing facility of the present embodiment is characterized in that oxygen rich combustion is performed in a cement kiln or a calcining furnace, so that the cement firing capability can be easily improved by oxygen rich combustion.
In general, when the cement firing ability is increased, the clinker cooling ability in the clinker cooler may not always be able to cope. In the present embodiment, the conventional clinker cooler is replaced with a high-efficiency clinker cooler, so that the clinker cooling capacity of the clinker cooler can be sufficiently accommodated even when the production is increased.

2 is a vertical cross-sectional view of the high-efficiency clinker cooler 5, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and 41 is a long length connected to the kiln front portion 4b of the cement kiln 4. Box-shaped cooler body, 42 is a cooler plate, 43 is a great support provided on the lower surface of the cooler plate, 44 is a partition plate, 45 is a cooling air pipe, and 46 is a bendable pipe provided in the middle of the pipe 45 flexible joint, 47a-47d and _{47a 1, 47a 2, 47b 1} , 47b 2 the cooling air fan, 48 is Eabimu (windbox).

The cooler plate 42 is a rectangular plate body, and several slit-shaped cooling air ejection holes are formed in the lateral width direction on the surface thereof, and the cooling air is supplied from the slit-shaped ejection holes to the surface of the plate body. The surface of the plate 42 is protected by cooling air by this cooling mechanism, so that the plate surface can be prevented from being melted by the high-temperature clinker. This is a so-called corrugated plate structure.
The cooler plate 42 is integrated with the great support 43 so that a space surrounded by the cooler plate 42 and the great support 43 is an air beam (wind box) 48.

As shown in FIG. 3, the air beam 48 is divided into two by a partition plate 44 in the width direction of the cooler main body 41, and is supplied by cooling air fans 47a ₁ , 47a ₂ , 47b ₁ , 47b ₂ that blow air to the respective sections. A certain amount of cooling air is ejected from the slit-like ejection holes on the surface of the cooler plate 42 via the air beam 48 in the direction of movement of the clinker (in the direction of the arrow in FIG. 2).
With this cooling air, the clinker is cooled uniformly and efficiently in the width direction of the cooler body 41. Moreover, even if the amount of air to be ejected is reduced, the above-described cooling mechanism can prevent the surface of the plate 42 from being melted. Furthermore, since the cooling air after cooling the clinker with a small amount of air has a high temperature, the heat recovery rate of the secondary air can be increased.

  This high-efficiency cooling mechanism is provided in a recovery area of secondary air for fuel combustion in the cement kiln 4 and the calcining furnace 7 and has an area of 25 to 35% with respect to the total cooling area of the clinker cooler 5 It is possible to collect sufficient high-temperature secondary air and to provide good clinker cooling.

The oxygen supplied by the oxygen production supply device 31 is supplied only to the cooling air fans 47a ₁ , 47a ₂ , 47b ₁ , 47b ₂ blowing the cooling air to the region having the high-efficiency cooling mechanism. The cooling air fans 47a ₁ , 47a ₂ , 47b ₁ , 47b ₂ are introduced into the ducts on the air intake side and mixed into the cooling air. When an operation is performed in which the oxygen concentration in the secondary air of the cement kiln 4 is increased, a large amount of oxygen is supplied to the cooling air fans 47a ₁ and 47a ₂ and the secondary air of the calcining furnace 7 is supplied. When an operation with an increased oxygen concentration is performed, a large amount of oxygen is supplied to the cooling air fans 47b ₁ and 47b ₂ .

  On the other hand, when it is necessary to increase the fuel combustion speed in the flame formed by the burner 12 of the cement kiln 4, more oxygen is supplied to the primary air fan 6d. The distribution and supply amount of these oxygen to the introduction site is determined while confirming the cement operation state according to the required clinker production amount, high water content waste processing amount, fuel used, etc. The predetermined operation state can be easily maintained by adjusting the amount of oxygen supplied to each part.

Next, a method for incinerating a high water content waste using the above cement burning equipment will be described.
The high water content waste to be incinerated is one or more selected from the group of sewage sludge, factory sludge, waste water, neutralized water, organic sludge, washing incineration ash, washing fly ash In addition, it is a waste that is incinerated at a high temperature and is a variety of waste.
Among such various high water content wastes, the high viscosity moisture sludge and washing fly ash can be put into any of the cement kiln 4, the calcining furnace 7, and the suspension preheater 8. In particular, the kiln bottom 4a of the cement kiln 4 is preferable.

  On the other hand, the low-viscosity, high-water-content waste, such as waste water, which is liquid, is charged at the position of the kiln bottom 4a of the cement kiln 4, the secondary air duct 9 of the calcining furnace 7, the calcining. There can be one or more points between the upper half of the furnace 7 and the lowermost cyclone 8d of the suspension preheater 8, and in particular, the upper half of the calcining furnace 7 and the lowermost cyclone of the suspension preheater 8 are possible. It is preferable that it is up to 8d because the effect of this input on the cement baking apparatus is small.

The reason for selecting the high moisture content waste input position as described above is that the odor components and organic components contained in the input high water content organic sludge, waste water, washing fly ash, etc. are completely burned and decomposed, and new This is because it needs to be in a temperature range where there is no possibility of generating a bad odor component and the like, and may be located upstream of the lowermost cyclone 8d with the combustion gas.
Further, in the case of high water content sludge, if the charging place is the calcining furnace 7, the contained water is rapidly evaporated, which adversely affects the formation of the fuel combustion frame of the calcining furnace 7, which is not preferable.

In addition, as in the case of the above-described wastewater charging process, the suspension preheater 8 from the kiln bottom 4 a of the cement kiln 4, the secondary air duct 9 of the calcining furnace 7, and the upper half of the calcining furnace 7 is used. Until the lower cyclone 8d, the influence of the high moisture content waste on the cement firing facility varies depending on the location.
For example, in the case of the kiln bottom part 4a of the cement kiln 4, the high water content sludge that has been input is immediately introduced into the cement kiln 4 and the temperature of the cement raw material is mainly reduced by evaporation, and the clinker firing in the cement kiln 4 is performed. However, it can be easily handled by ensuring the clinker firing temperature by increasing the oxygen concentration in the secondary air introduced into the cement kiln 4 in particular.

However, since excessive oxygen concentration rapidly increases the internal temperature of the cement kiln 4, it is preferable to avoid concentrating high water content waste on the kiln bottom of the cement kiln 4.
On the other hand, when it is introduced into the secondary air duct 9 of the calcining furnace 7, the secondary air temperature is lowered due to the rapid evaporation of water in the secondary air duct 9. Therefore, it is possible to easily obtain the necessary decarboxylation by increasing the oxygen concentration of the secondary air of the calcining furnace 7 and increasing the fuel in order to maintain the decarbonation of the cement raw material.

  Thus, the influence given to each place in a cement baking equipment changes with input parts, such as a high moisture content organic sludge and wastewater, and the subsequent evaporation behavior of a water | moisture content. Therefore, when a large amount of waste having a high water content is charged, it is avoided to concentrate it at a specific location. For example, the kiln bottom 4a of the cement kiln 4 and the secondary air duct 9 of the calcining furnace 7, Between the upper half of the furnace 7 and the lowermost cyclone 8d, etc., it is distributed in two or more places, and the secondary air of the cement kiln 4 and the calciner 7 is supplied in accordance with the amount charged into each place. By setting the oxygen concentration and performing fuel combustion, it becomes possible to more stably treat waste with a high water content.

  In the cement firing facility of the present invention, the unit of secondary air recovered from the clinker cooler 5 is reduced by performing oxygen-rich combustion, so that the recovered secondary air moves to a high temperature region. Further, although the sensible heat of the entire secondary air to be recovered decreases due to the reduction of the combustion gas intensity, on the other hand, the heat exchange between the gas and the raw material in the cement firing facility proceeds, and the temperature of the exhaust gas from the suspension preheater 8 decreases and the exhaust gas source. The unit will decrease. Therefore, the calorific value for calcining the cement clinker by oxygen-rich combustion hardly changes, but the cement clinker calcining capacity increases.

  In such a state, when high water content waste is thrown into one or more of the above locations, the recovered secondary air intensity is associated with a decrease in the production capacity of cement clinker and an increase in the energy intensity. Increase occurs. However, since the new recovered secondary air accompanying the increase in the calorific value becomes higher in temperature than the conventional example, the increase in the calorific value does not increase. This increase in the calorific value is approximately about 60% of the increase in the calorific value of the conventional example.

According to the cement production facility of the present embodiment, since the oxygen production supply device 31 and the high water content organic sludge direct input treatment device 21 are provided, by performing oxygen-rich combustion by supplying oxygen, the gas intensity is obtained. As a result, it is possible to increase the cement firing ability and to easily increase the temperature of the clinker firing zone in the cement kiln 4.
Therefore, by recovering more efficient secondary air, excessive combustion gas is not required, and even when processing a large amount of high water content organic sludge, cement can be secured while ensuring a predetermined amount of cement production. The increase in the calorific value for calcining of the clinker can be reduced, and the quality of the obtained clinker can be maintained.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
In the comparative example, the effect was confirmed from the operation value obtained by treating the waste with high water content in the conventional cement firing equipment, and the example was cooled by a clinker cooler in the same cement firing equipment. The operation value is predicted when oxygen is added to the air.

"Comparative Examples 1-6"
As Comparative Examples 1 to 6, the following cement firing equipment with a conventional clinker cooler was used, and the amount and position of sewage sludge (high water content sludge) and waste liquid (waste water) with a water content of approximately 100% by weight were changed. A treatment test was conducted.
The outline of the sewage sludge, waste water, cement burning equipment, etc. is as follows.

(1) Sewage sludge Moisture content 82% (solid content 18%)
Solid content composition: Ash content 14.2%, volatile content 70%, solid carbon 8.3%
Elemental analysis: carbon 37.4%, hydrogen 5.7%, nitrogen 4.4%, oxygen 36.3%
Calorific value (high): 3500 Kcal / kg
(True calorific value 3100Kcal / kg)
Theoretical combustion air volume: 3.8 Nm ³ / kg
Theoretical combustion gas amount: 4.4 Nm ³ / kg
(2) Wastewater Treatment wastewater such as neutralization with water content of almost 100% by weight

(3) Cement firing equipment A
This is a conventional cement firing facility.
a. Suspension preheater and calcining furnace 5-stage cyclone type suspension preheater and fluidized furnace calcining furnace (N-SF type)
b. Cement kiln Cement kiln size 100mL × 5.3mφ
c. Clinker cooler Conventional clinker cooler (manufactured by Bab Hitachi)

Here, the amount and position of sewage sludge or wastewater input are selected for the conventional cement firing equipment A, and 1% by weight with respect to the cement clinker production amount (clinker production capacity) without sewage sludge or wastewater input. In the case where the weight was changed at three levels of 7% by weight, changes in operations such as clinker production capacity, clinker quality (firing degree) and clinker calorific value of the clinker calcining equipment were examined.
Regarding the input position, the bottom of the cement kiln was selected for the sewage sludge, and the calciner was selected for the wastewater.
The operating condition is that when the exhaust gas temperature of the suspension preheater 8 becomes 380 ° C. or higher, water is sprayed from the gas inlet of the uppermost cyclone 8a, and the exhaust gas temperature of the uppermost cyclone 8a is set to 380 ° C. Maintained.
These results are shown in Table 1.

In addition, the case where no sewage sludge was added was regarded as the “standard”, and the change in the operating value of the cement burning equipment was investigated when the treatment of sewage sludge or wastewater was increased. Table 2 shows the evaluation results of the fuel ratio, the temperature of each part of the cement firing facility, and the operation status under each operation condition.
The “temperature change amount” in Table 2 is the temperature change amount (temperature difference) from the reference value.
In addition, the criteria for judging the operation status in Table 2 are as follows.
○: When maintaining the degree of clinker firing and continuous operation for a long time.
Δ: When the amount of combustion gas in the cement kiln cannot be ensured, etc., and the clinker firing amount is frequently reduced to cope with it.
X: When the clinker firing degree is difficult to maintain and continuous operation is difficult.

According to Tables 1 and 2, when about 4% of sewage sludge was treated, it was possible to continue the operation of the cement firing equipment, but when the adhesion of apricot increased with the rise of the cement kiln kiln bottom temperature, It was difficult to maintain the clinker firing degree, and there was a problem that it was necessary to significantly reduce the amount of clinker firing.
In addition, when processing about 6% of sewage sludge, the operation of the cement firing facility became unstable, and it was difficult to ensure the degree of clinker firing.

In particular, at a level of about 6%, it is difficult to maintain the clinker temperature in the clinker firing zone due to a sudden increase in anzat adhesion accompanying a rise in the temperature of the kiln bottom of the cement kiln and a decrease in the amount of combustion gas. However, there were many factors that deteriorated operation, and continuous operation for a long time was difficult.
Regarding the change in the clinker firing capacity, in the cement firing facility (A), the clinker firing amount is reduced by about 3 times the amount of the treated sewage sludge. It was also confirmed that the calorific value of clinker firing deteriorated by about 2.0% per 1% by weight of sewage sludge in the treatment range of 3 to 4%.
Therefore, the amount of sewage sludge that can be treated in the cement firing facility A is about 3 to 4% or less with respect to the clinker firing capacity when no additive is added, if it is performed only within a range in which the cement firing facility can be stably operated. Become.

"Examples 1-7"
The oxygen production and supply apparatus of the present invention is attached to the conventional cement firing facility A, and the following cement firing facilities B and C, in which the conventional clinker cooler is changed to a high-efficiency clinker cooler, are used as in the comparative example. The changes in operation such as clinker production capacity, clinker quality (firing degree) and clinker calorific value of cement calcination equipment were investigated by prediction calculation.
The prediction conditions are that oxygen addition is introduced into the cooling air of the clinker cooler, the oxygen concentration of the fuel combustion air including the primary air of the cement kiln is 23%, the oxygen of the fuel combustion air for the calciner For the case where the concentration was 25%, the increase in cement firing ability and the possible amount of waste with high water content were performed.

(1) Cement firing equipment B
Conventional cement firing equipment (cement firing equipment A) + oxygen production and supply equipment (2) Cement firing equipment C
Clinker cooler of conventional cement firing equipment (cement firing equipment A) is changed to high-efficiency clinker cooler + oxygen production and supply equipment High-efficiency clinker cooler: PENJRAM clinker cooler manufactured by IKN

The assumed conditions of Examples 1 to 7 are as follows.
Example 1 (Assumed operation example 1): In the cement firing facility B, when the high water content waste is not treated under the above oxygen-rich combustion conditions, an increase in clinker firing capacity and its operation are assumed.
Example 2 (Operational assumption example 2): In the cement firing facility B, an operation assumption in the case where the high moisture content waste is treated in the above oxygen-rich combustion condition in the same amount as in Comparative Example 3.
Example 3 (Operational assumption example 3): In the cement firing facility B, in the operation in which the waste with high water content is treated under the above oxygen-rich combustion conditions and the clinker firing capacity is the same as the reference value, the high water content Assumes the amount of waste that can be treated and its operation.
-Example 4 (Operational assumption example 4): In the cement baking facility B, the operation when the high water content waste is treated under the above oxygen-rich combustion conditions and the treatment amount of the high water content waste is increased. Assumption.

-Example 5 (Operation assumption example 5): In the cement baking equipment B, when the high water content waste is treated under the above oxygen-rich combustion conditions, the high water content waste is put into two places. Assumed operation.
Example 6 (Operational assumption example 6): In the cement baking facility C, when the high water content waste is not treated under the above oxygen-rich combustion conditions, an increase in clinker baking capacity and its operation are assumed.
-Example 7 (Operation assumption example 7): In the cement firing facility C, the operation when the high water content waste is treated under the above oxygen-rich combustion conditions and the treatment amount of the high water content waste is increased. Assumption.
These results are shown in Tables 3 and 4.

According to Tables 3 and 4, it can be seen that in the treatment of high moisture content waste by the cement firing facility B and the cement firing facility C that performed oxygen-rich combustion, the following operational state changes appear from the assumed calculation results. It was.
(1) Oxygen combustion makes it possible to improve the clinker firing ability of cement firing equipment.
(2) Since the secondary air intensity recovered by oxygen-rich combustion is reduced, the secondary air is recovered only in the high temperature region, and the temperature rises significantly particularly in the calcining furnace secondary air.

(3) Oxygen-rich combustion causes a decrease in gas intensity, resulting in an increase in fuel combustion gas temperature and a decrease in gas temperature after heat exchange in the upper region of the suspension preheater. It can also be expected to lead to a decrease in kiln bottom temperature.
(4) Therefore, in the oxygen-rich combustion, the calorific value for calcining the cement clinker hardly changes.
(5) The treatment of waste having a high water content under oxygen-rich combustion is particularly reduced by the effects of the above-mentioned (2) and (3), and the influence on the calorific value is alleviated.

  In Example 1, the oxygen concentration of the fuel combustion air containing primary air of the cement kiln is 23%, and the oxygen concentration of the fuel combustion air for the calciner is 25%. As the secondary air temperature to be recovered moves only to the high temperature region, the temperature rise of the secondary air in the calciner becomes particularly significant, while the second stage cyclone outlet temperature of the suspension preheater decreases. As a result, the clinker firing ability was improved by about 22%, and the calorific value was slightly reduced.

Examples 2 to 5 are predictions of operating states in which the amount of high water content waste in cement firing equipment B, which uses a clinker cooler as a conventional type, was sequentially increased. The effect of the treatment on the operation is only an increase of 1 to 1.3% in terms of clinker calorific value per 1% by weight of the high water content waste added. As a result, the gas temperature in the upper region of the suspension preheater is lowered, and operation without increasing the temperature at the bottom of the kiln becomes possible.
As a result, the treatable amount of the high water content waste was 5% by weight or more with respect to the clinker firing amount. Therefore, even if the treatment amount of the high water content waste is set to 10% by weight or more, it is expected that the operation is sufficiently possible.

  In Examples 6 and 7, the operation state in the cement firing equipment C with a high-efficiency clinker cooler is predicted. However, the heat exchange of the clinker cooler can be improved by introducing the high-efficiency clinker cooler. So it becomes possible to produce more clinker. Furthermore, it is possible to reduce the basic unit of calcining calcining calorie, and it becomes possible to treat a larger amount of high water content waste while maintaining the calcining calcining amount.

As described above, when compared with the conventional cement firing facility A, the cement firing facilities B and C of the examples show the effect of the high moisture content waste on the cement firing facility by performing oxygen-rich combustion. It was found that the calorific value can be reduced to about 50 to 60%, and the clinker firing ability can be improved.
Furthermore, since the impact on the operation associated with an increase in the treatment amount of high water content waste can be reduced or reduced, it is possible to treat a large amount of high water content waste while ensuring a predetermined amount of clinker firing amount. It turns out that it is possible enough.

It is a schematic diagram which shows the cement manufacturing equipment of one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the high efficiency type clinker cooler of the cement manufacturing equipment of one Embodiment of this invention. It is sectional drawing which follows the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw material mill 2 Cyclone 3 Cement raw material storage 4 Cement kiln 4a Kiln bottom part 4b Kiln front part 5 Clinker cooler 6a-6c Clinker cooler cooling fan 7 Calciner 8 Suspension preheater 8a-8d Cyclone 9 Secondary air duct 10 Electric dust collector 11 Exhaust chimney 12 Burner 13 Cooler exhaust line 14 Cement raw material supply line 15 Cement raw material powder supply line 16 Cement clinker transfer line 21 High moisture content organic sludge direct input treatment device 22 Reservoir 23 Pump 24 High moisture content organic sludge supply line 31 Oxygen Production supply device 32 Oxygen production device 33 Primary air oxygen supply line 34 Clinker cooler cooling air oxygen supply line 41 Cooler body 42 Cooler plate 43 Great support 44 Partition plate 45 Cooling air piping 46 Flexi Le joint _{47a~47d, 47a 1, 47a 2,} 47b 1, 47b 2 the cooling air fan 48 Eabimu

Claims (5)

A suspension preheater for preheating the cement raw material, a calcining furnace for calcining the preheated cement raw material, a cement kiln for firing the calcined cement raw material to be a clinker, and a clinker cooler for cooling the clinker A method for incinerating high water content waste using a cement burning facility provided,
Oxygen generated from the oxygen supply means is mixed with one or both of the fuel combustion air of the cement kiln and the fuel combustion air of the calcining furnace to perform fuel combustion, and the oxygen generated from the oxygen supply means is , Mixed in the cooling air of the clinker cooler,
Among the high water content waste, highly viscous high water content sludge and washed fly ash are directly put into one or more of the cement kiln, the calciner, and the suspension preheater, and the low viscosity high The moisture content waste is any one of the kiln bottom of the cement kiln, the secondary air duct of the calciner, and the upper half of the calciner to the lowermost cyclone of the suspension preheater. A method for treating high moisture content waste, characterized in that it is directly charged and then incinerated. The amount of the high water content waste introduced into the calcining furnace or the cement kiln is 4% by weight or more based on the amount of the clinker fired in the cement firing facility, and the total amount contained in the high water content waste. The method for treating a high water content waste according to claim 1 , wherein the water content is at least 3% by weight in terms of water content. The high moisture content waste is one or more selected from the group of sewage sludge, factory sludge, waste water, neutralized water, organic sludge, washing incineration ash, washing fly ash, and high temperature 3. The method for treating a high water content waste according to claim 1 , wherein the waste is subjected to incineration. The method for treating a high water content waste according to any one of claims 1 to 3, wherein the clinker cooler is a pendulum clinker cooler . A suspension preheater for preheating the cement raw material, a calcining furnace for calcining the preheated cement raw material, a cement kiln for firing the calcined cement raw material to be a clinker, and a clinker cooler for cooling the clinker An apparatus for incinerating high water content waste using the cement burning equipment provided,
Oxygen supply means for supplying oxygen to either or both of the fuel combustion air of the cement kiln and the fuel combustion air of the calciner, and to be mixed into the cooling air of the clinker cooler ;
Among the high water content waste, a supply means for directly feeding highly viscous high water content sludge and washing fly ash to any one or more of the cement kiln, the calciner, and the suspension preheater , Viscous, high moisture content waste is any of the cement kiln kiln bottom, the secondary air duct of the calciner, and the upper half of the calciner to the lowest cyclone of the suspension preheater. Or supply means to directly input into one or more locations,
A high moisture content waste treatment apparatus comprising:

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