CN212284042U - Quick entrained flow sludge drying burns simple and easy device - Google Patents

Abstract

The utility model provides a simple device for drying and incinerating sludge of a rapid entrained flow bed, which comprises a wet sludge bin, a rapid entrained flow bed sludge dryer, a primary breaking crusher, a sludge crusher, an air chamber and a pulverized coal boiler, wherein a discharge port of the wet sludge bin is connected with a sludge feed port on the rapid entrained flow bed sludge dryer; the discharge hole of the rapid entrained flow sludge dryer is connected with the feed inlet of the pulverized coal boiler; a primary breaking-up crusher is arranged at the sludge feeding port; an air chamber is arranged at the bottom of the rapid entrained flow sludge dryer, and an air inlet on the air chamber is connected with a high-temperature flue gas outlet on a flue of the pulverized coal boiler; a sludge crusher is arranged at the bottom of the air chamber; the utility model discloses a whole system is comparatively simple, and has that take up an area of for a short time, maintenance cost low, operation power consumption is low, the investment is little, retrieve multiple advantage such as fast, has avoided doing mud to deal with the latent influence to mummification machine and coal-fired unit operation alone after separating from the exhaust gas, and a whole system is more simple and easy, and the reliability is higher, compares other sludge drying of present stage and burns the technique, and the advantage is obvious, and the competitiveness is comparatively outstanding.

Description

Quick entrained flow sludge drying burns simple and easy device

Technical Field

The utility model relates to a coal fired boiler coupling living beings utilize environmental protection technical field, in particular to quick entrained flow sludge drying burns simple and easy device.

Background

Along with the development of society and the improvement of the living standard of people, the urban sewage treatment amount is increased day by day, and correspondingly, the generation amount of urban sludge which is a derivative of sewage treatment is increased day by day. The annual production of municipal sludge in the whole country in 2015 reaches 5000 ten thousand tons, and if industrial sludge is calculated, the total amount of the sludge reaches the level of municipal domestic waste. The reasonable and environment-friendly treatment demand of a large amount of municipal sludge is increasing day by day. In combination with the situation of China, the sludge treatment based on the incineration of the coal-fired unit is the most environment-friendly and effective treatment mode.

The harmless treatment modes of the sludge at the present stage are different according to the differences of various factors such as drying, drying degree, drying medium, contact mode and the like. For example, the circulating fluidized bed boiler can directly mix and burn a certain proportion of municipal sludge by virtue of the characteristic of wide fuel application range without drying treatment. Due to the particularity of a combustion system of the pulverized coal boiler with a larger storage amount, the sludge needs to be dried and ground into dry sludge with qualified particle size, and the dry sludge and the raw coal can be burnt together or independently. The sludge drying treatment mainly adopts flue gas or steam as a heat source to carry out drying in different degrees, and then the dried sludge is sent into a coal-fired boiler to be incinerated. Although the sludge drying and incinerating task can be well completed, the sludge drying system has the problems of complex system, large floor area, large investment, high power consumption, high maintenance cost and the like to different degrees, and the seeking of a more efficient and low-consumption sludge drying and incinerating device is urgent and is also an important supplement to the prior drying technical field.

Disclosure of Invention

An object of the utility model is to provide a quick entrained flow sludge drying burns simple and easy device has solved current sludge drying system and has had the problem that the system is complicated, area is big, the investment is big, the power consumption is high, the maintenance cost is high to different degrees.

In order to achieve the above purpose, the utility model discloses a technical scheme is:

the utility model provides a simple device for drying and incinerating sludge of a rapid entrained flow bed, which comprises a wet sludge bin, a rapid entrained flow bed sludge dryer, a primary breaking crusher, a sludge crusher, an air chamber and a pulverized coal boiler, wherein a discharge port of the wet sludge bin is connected with a sludge feed port on the rapid entrained flow bed sludge dryer; the discharge hole of the rapid entrained flow sludge dryer is connected with the feed inlet of the pulverized coal boiler; a primary breaking-up crusher is arranged at the sludge feeding port;

an air chamber is arranged at the bottom of the rapid entrained flow sludge dryer, and an air inlet on the air chamber is connected with a high-temperature flue gas outlet on a flue of the pulverized coal boiler;

and a sludge crusher is arranged at the bottom of the air chamber.

Preferably, the sludge feeding hole is provided with a plurality of sludge feeding holes; a plurality of sludge feed inlets are uniformly distributed along the circumferential direction of the cylinder of the rapid entrained flow sludge dryer; and a primary breaking-up crusher is arranged at the inlet of each sludge feeding hole.

Preferably, an anti-blocking grid is further arranged on an inner cavity of the rapid entrained flow sludge dryer, and the anti-blocking grid is arranged below the sludge feeding hole.

Preferably, an air distribution plate is arranged above the air chamber; the wind distribution plate is provided with a wind cap.

Preferably, the high-temperature flue gas outlet on the pulverized coal boiler flue is arranged above the air preheater, and the air preheater is arranged on the pulverized coal boiler flue.

Preferably, a dry sludge particle outlet of the rapid entrained flow sludge dryer is connected with a feed inlet of the pulverized coal boiler through an induced draft fan.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a quick entrained flow bed sludge drying burns simple and easy device, sludge drying burns the system based on quick entrained flow bed structure, combine the air separation technique, the breakage of wet mud is realized in the quick entrained flow bed sludge drying machine of static nothing rotation, mummification and separation, have the system simply, take up an area of for a short time, maintenance cost is low, the operation power consumption is low, the investment is little, retrieve multiple advantages such as fast, exhaust gas and dry sludge granule are sent into furnace high temperature environment together and are burnt the processing, the whole system is comparatively simple, and have take up an area of for a short time, maintenance cost is low, the operation power consumption is low, the investment is little, retrieve multiple advantages such as fast, avoid the potential influence to desiccator and coal-fired unit operation of handling alone after dry sludge separates from exhaust gas, the whole system is more simple and easy, the reliability is higher, compare other sludge drying technique in the present stage, obvious advantage, the competitiveness is outstanding.

Drawings

Fig. 1 is a schematic structural view of an apparatus according to the present invention;

fig. 2 is a schematic view of the structure of the anti-blocking grid.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the utility model provides a pair of quick entrained flow sludge drying burns simple and easy device, break up breaker 5, prevent stifled grid 6, air distributor 7, hood 8, sludge cracker 9, plenum 10, draught fan 11, air preheater 12 and pulverized coal fired boiler 13 including wet sludge bin 1, auger delivery ware 2, quick entrained flow sludge dryer 3, mud feed inlet 4, elementary breaking, wherein, the discharge gate in wet sludge bin 1 passes through auger delivery ware 2 and connects the mud feed inlet on quick entrained flow sludge dryer 3.

A plurality of sludge feed ports 4 are arranged; a plurality of sludge feeding holes are uniformly distributed along the circumferential direction of the cylinder body of the rapid entrained flow sludge dryer 3.

And a primary breaking-up crusher 5 is arranged at the inlet of each sludge feeding hole 4 and is used for primarily crushing wet sludge and avoiding affecting the drying efficiency when the wet sludge enters the drying machine in a blocky or massive form.

An anti-blocking grating 6 is further arranged on the inner cavity of the rapid entrained flow sludge dryer 3, and the anti-blocking grating 6 is arranged below the sludge feeding hole 4.

The size of the grid meshes of the anti-blocking grid 6 is optimally designed by combining the sludge characteristics, for example, 150mm is multiplied by 150mm, a small number of large and wet sludge blocks which are not fully crushed are intercepted by the anti-blocking grid 6, and are dried and crushed into smaller particles to fall into the bottom through the drying of high-temperature flue gas and the collision effect of sludge particles from bottom to top.

The bottom of the rapid entrained flow sludge dryer 3 is an air chamber 10, and an air distribution plate 7 is arranged above the air chamber 10.

And the air distribution plate 7 is provided with an air cap 8.

An air inlet of the air chamber 10 is connected with a high-temperature flue gas outlet arranged on a flue of the pulverized coal boiler 13.

The high-temperature flue gas outlet is arranged above the air preheater 12 in the flue.

The bottom of the air chamber 10 is provided with a sludge crusher 9.

And a dry sludge particle outlet of the rapid entrained flow sludge dryer 3 is connected with a feed inlet of a pulverized coal boiler 13 through a draught fan 11.

The utility model discloses a working process:

the municipal sludge to be treated is intensively sent to a wet sludge bin 1 near the coal-fired unit for storage, and the wet sludge discharged from the wet sludge bin 1 is transported to a rapid entrained flow sludge dryer 3 by a screw conveyor 2. According to the water content of the sludge to be treated, a corresponding wet sludge bin 1 can be constructed in a targeted manner, and a special screw conveyor 2 can be used, for example, a sludge screw pump is used for the fluid sludge with the water content of 80%, and an auger can be used for conveying the block sludge with the water content of 60%. The wet sludge is fed into a sludge feed port 4 uniformly arranged on the cylinder of the rapid entrained flow sludge dryer 3.

Wet sludge is primarily crushed by a primary scattering crusher 5 in the sludge feeding hole 4, so that the influence on drying efficiency caused by the fact that the wet sludge enters a drying machine in a block or lump form is avoided.

An air chamber 10 is arranged at the bottom of the rapid entrained flow sludge dryer 3, and quantitative dried flue gas (such as 340 ℃) is extracted from a flue above an air preheater 12 of a pulverized coal boiler 13 and is sent into the air chamber 10 under the action of an induced draft fan 14; an air distribution plate 7 is arranged above the air chamber 10, wherein air caps 8 with a total design are uniformly arranged, and the dried flue gas flowing through the air chamber 10 is accelerated and then is sent into the dryer.

After the wet sludge is contacted with the high-temperature flue gas, violent mass and heat transfer actions occur in the drying pipe: under a specific smoke velocity, if the gravity of wet sludge particles is balanced with the drag force of the smoke on the wet sludge particles, the sludge particles are suspended, but in a high-temperature environment, the wet sludge and the smoke undergo a violent mass and heat transfer process to lose weight, and finally the drying is finished and the wet sludge and the smoke are carried out of the drier under the action of the drag force. For wet sludge with larger particle size, the wet sludge moves downwards under the action of gravity and is dried, when the wet sludge moves to the bottom of the dryer, the wet sludge is mechanically crushed into particles with small particle size by the sludge crusher 9, and finally the wet sludge is dried like fine particles and is taken away from the dryer. The expected drying effect (such as the water content of 40%) of the wet sludge can be realized by the optimized design of parameters such as the smoke temperature, the smoke speed, the cylinder diameter and the cylinder height of the drying machine and the like.

The flue gas is mixed with dried and evaporated water vapor and sludge drying gas (such as NH3, H2S, and the like), and is generally called exhaust gas. The exhaust gas increases the flow velocity of the flue gas in the downstream pipeline of the drier with smaller flow area, and the particle size of the dry sludge particles which are pneumatically sorted in the drier is smaller, thereby ensuring the good carrying capacity of the exhaust gas on the dry sludge particles and realizing pneumatic conveying.

The power for extracting the drying flue gas, operating the drying machine and conveying the exhaust gas is provided by an induced draft fan 11, the operating resistance of the whole system is 7-8 kPa, and the pressure head of the induced draft fan 11 can be selected to be about 10 kPa.

The exhaust gas carrying dry sludge particles is sent into a hearth of the pulverized coal boiler 13 through the draught fan 11 to be incinerated, and in an incineration environment with the temperature of over 1200 ℃, gases such as NH3, H2S and the like in the exhaust gas are decomposed and are discharged up to the standard under the action of a pollutant removing device arranged in the pulverized coal boiler 13.

The sludge drying and incinerating system constructed based on the rapid entrained flow bed is combined with a pneumatic separation technology, the crushing, drying and separation of wet sludge are comprehensively realized in the static non-rotating rapid entrained flow bed sludge dryer 3, exhaust gas and dry sludge particles are sent into a high-temperature environment of a hearth for incineration treatment, the whole system is simpler, and the sludge drying and incinerating system has the advantages of small occupied area, low maintenance cost, low operation power consumption, small investment, quick recovery and the like, avoids the potential influence of independent disposal of the dry sludge separated from the exhaust gas on the operation of the dryer and a coal-fired unit, is simpler and more simple, has higher reliability, and has obvious advantages and more outstanding drying and incinerating competitiveness compared with other sludge incineration technologies in the current stage.

Claims (6)

1. A simple device for drying and incinerating sludge of a rapid entrained flow bed is characterized by comprising a wet sludge bin (1), a rapid entrained flow bed sludge dryer (3), a primary breaking crusher (5), a sludge crusher (9), an air chamber (10) and a pulverized coal boiler (13), wherein a discharge hole of the wet sludge bin (1) is connected with a sludge feed hole (4) on the rapid entrained flow bed sludge dryer (3); the discharge hole of the rapid entrained flow sludge dryer (3) is connected with the feed inlet of the pulverized coal boiler (13); a primary breaking-up crusher (5) is arranged at the sludge feeding hole (4);

an air chamber (10) is arranged at the bottom of the rapid entrained flow sludge dryer (3), and an air inlet on the air chamber (10) is connected with a high-temperature flue gas outlet on a flue of a pulverized coal boiler (13);

and a sludge crusher (9) is arranged at the bottom of the air chamber (10).

2. The simple device for sludge drying and incineration of the rapid entrained flow bed according to claim 1, characterized in that a plurality of sludge feeding holes (4) are provided; a plurality of sludge feed inlets are uniformly distributed along the circumferential direction of the cylinder of the rapid entrained flow sludge dryer (3); and a primary breaking-up crusher (5) is arranged at the inlet of each sludge feeding hole (4).

3. The simple device for drying and incinerating sludge of the rapid entrained flow bed according to claim 1, characterized in that an anti-blocking grid (6) is further arranged on an inner cavity of the rapid entrained flow bed sludge dryer (3), and the anti-blocking grid (6) is arranged below the sludge feeding port (4).

4. The simple device for sludge drying and incineration of the rapid entrained flow bed according to claim 1, characterized in that an air distribution plate (7) is arranged above the air chamber (10); and the air distribution plate (7) is provided with an air cap (8).

5. The simple device for rapid entrained-flow sludge drying and incineration as claimed in claim 1, wherein a high-temperature flue gas outlet on a flue of the pulverized coal boiler (13) is arranged above an air preheater (12), and the air preheater (12) is arranged on the flue of the pulverized coal boiler (13).

6. The simple device for drying and incinerating the sludge of the rapid entrained flow bed according to claim 1, characterized in that a dry sludge particle outlet of the rapid entrained flow sludge dryer (3) is connected with a feed inlet of a pulverized coal boiler (13) through an induced draft fan (11).

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