CN215196359U - Fertilizer low tower granulation ground paste preparation facilities - Google Patents

Abstract

The utility model discloses a fertilizer low tower granulation slurry preparation device, which comprises a slurry preparation device arranged in the area below the middle part of a granulation tower, wherein the slurry preparation device comprises a multistage groove, a slurry pump, a slurry backwashing filter device and a tail gas treatment device; after solid raw materials put into each stage of tank are stirred, mixed and melted at high temperature step by step, the solid raw materials flow into the lowest stage of tank in the form of liquid slurry to be melted and mixed, the slurry after being mixed and melted is sent to a slurry back washing filter device through a slurry pump to be filtered, and then sent to a granulator to be granulated, and the slurry back washing filter device can be automatically cleaned. The tail gas treatment device is connected with each stage of tank and is used for collecting tail gas generated by each stage of tank and discharging the tail gas after secondary washing; the utility model discloses with low costs, can intelligent washing and reduce the prilling tower height, and the environmental protection is pollution-free.

Description

Fertilizer low tower granulation ground paste preparation facilities

Technical Field

The utility model relates to a fertilizer tower granulation equipment technical field, in particular to fertilizer hangs down tower granulation ground paste preparation facilities.

Background

The fertilizer low tower granulation slurry preparation device is the core equipment of the whole system, and the slurry preparation device is installed on the top of the tower in all the prior fertilizer tower granulation processes, and the defects of the scheme are as follows: firstly, the total weight of the whole slurry preparation device is at least more than 30 tons, and the heavy equipment is arranged at the top of the tower body, so that the construction cost of the whole tower body is very high; when the slurry preparation device is arranged at the top of the tower body, the required raw materials are conveyed to the top of the tower from the ground to be put in, so that the lifting cost of the raw materials and the equipment investment cost are increased; slurry preparation facilities installs when the tower body top, considers the principle nearby of tail gas dust removal pipeline, also can install tail gas processing apparatus at the tower body top, so both can aggravate the tower body load and increase the investment, can increase tail gas processing apparatus water circulating system's running cost again, because the used water of tail gas processing apparatus will be sent to the top of the tower from ground, tail gas processing apparatus's waste water is in order to send to the above-ground from the top of the tower and is handled.

The prior slurry preparation process contains partial impurities, and the impurities are mainly generated due to the following reasons: firstly, impurities contained in the raw materials are difficult to screen out before the raw materials are put in; and secondly, non-fusible slurry with a part of small particles is generated in the slurry due to various reasons such as temperature control, material return and the like in the slurry preparation process. Impurities in the slurry enter the granulator to cause the blockage of the granulator, reduce the granulation yield and even stop the granulator to replace a new granulator.

Therefore, the prior art needs to be further improved, and the fertilizer low-tower granulation slurry preparation device is low in cost, capable of intelligently cleaning and filtering and reducing the height of the granulation tower.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a prior art's is overcome to the purpose not enough, provides a fertilizer low tower granulation ground paste preparation facilities with low costs, can intelligent washing filter and reduce the prilling tower height.

In order to realize the purpose of the utility model, the utility model discloses a technical scheme realize as follows: a low tower granulation slurry preparation device for fertilizer comprises a slurry preparation device arranged in the area below the middle part of a granulation tower, wherein the slurry preparation device comprises a multistage tank and a slurry pump;

the multistage grooves are sequentially connected, the horizontal height of the next-stage groove is lower than that of the previous-stage groove, and the lowest-stage groove is connected with a slurry pump;

solid raw materials are put in each stage of tank, the solid raw materials put in the previous stage of tank are heated and melted at high temperature to form liquid slurry to be overflowed or discharged into the next stage of tank, the liquid slurry is mixed with the solid raw materials melted in the next stage of tank to form mixed melt, the mixed melt is melted and mixed step by step in sequence, final mixed slurry is formed in the next stage of tank, and the final mixed slurry is sent into a granulation tower through the slurry pump.

Preferably, the multistage groove comprises a primary groove, a secondary groove and a tertiary groove which are connected in sequence; the horizontal height of the secondary groove is lower than that of the primary groove; the level of the tertiary tank is lower than that of the secondary tank.

Preferably, the primary tank, the secondary tank and the tertiary tank comprise tank bodies, the tank bodies are stainless steel closed containers with stirring devices inside, coil pipe heating devices are arranged inside the tank bodies of the primary tank and the secondary tank, and jacket heating devices are arranged outside the tank bodies of the primary tank, the secondary tank and the tertiary tank; the upper part of the outer side wall of the tank body is provided with a steam inlet communicated with the coil heating device and the jacket heating device; introducing steam into the coil heating device and the jacket heating device through the steam inlet, and melting the solid raw materials added into the groove body into liquid slurry; and a steam inlet adjusting valve is arranged at the steam inlet and used for adjusting the amount of the heating steam.

Preferably, the bottom of the tank body is provided with a discharge valve and a steam outlet, the discharge valve is positioned in the center of the bottom of the tank body, and the discharge valve of the upper-stage tank is connected with the top of the lower-stage tank and is used for discharging slurry into the lower-stage tank; the steam outlet is positioned at the outer side of the discharge valve; a slurry temperature sensor is arranged at the top of the tank body; the slurry temperature sensor is positioned at the upper part of the tank body, the detection end of the slurry temperature sensor extends into the slurry melted in the tank body and is used for detecting the temperature of the melted slurry, the slurry temperature sensor is connected with the steam inlet adjusting valve in an interlocking manner, and the steam inlet adjusting valve adjusts the heating steam quantity according to the temperature value detected by the slurry temperature sensor; overflow ports communicated with the inside of the primary groove and the secondary groove are obliquely arranged on the side walls of the bottoms of the primary groove and the secondary groove.

Preferably, the stirring device comprises a stirrer vertically arranged inside the tank body and a driving motor vertically arranged outside the top of the tank body; the upper end of the stirrer penetrates through the top of the tank body and is in driving connection with the driving motor.

Preferably, the slurry tank also comprises a first slurry pipe for connecting the lower part of the side wall of the primary tank and the top of the secondary tank and a second slurry pipe for connecting the lower part of the side wall of the secondary tank and the top of the tertiary tank; the shapes and the sizes of the first slurry pipe and the second slurry pipe are consistent; the first slurry pipe and the second slurry pipe respectively comprise a first connecting part and a second connecting part which are connected with each other, the first connecting parts are arranged in an upward inclined manner and are connected with corresponding overflow ports, and the highest positions of the first connecting parts are higher than the height of the coil pipes in the corresponding tank body by 100 mm; the second connecting portion is vertically arranged downwards and communicated with the inside of the corresponding groove body.

Preferably, the slurry pump is a horizontal slurry pump, an inlet of the horizontal slurry pump is connected with a discharge valve at the bottom of the three-stage tank, and an outlet of the horizontal slurry pump is connected with the slurry backwashing filter device; and the slurry pump sends the slurry flowing out of the discharge valve at the bottom of the three-stage tank to a slurry backwashing filter device for filtering, and sends the filtered slurry to a granulator.

Preferably, the slurry pump sends the final mixed slurry to the slurry backwashing filter device for filtering and then conveys the final mixed slurry to the granulation tower; the slurry backwashing filter device comprises a backwashing filter body, the backwashing filter body is a stainless steel closed container, the backwashing filter body comprises a filter shell, a slurry inlet and a slurry outlet are formed in the side wall of the filter shell, and a backwashing steam inlet and a slag discharge port are respectively formed in the top and the bottom of the filter shell; a filter screen is arranged in the filter shell and is of a pore plate type inverted cup-shaped structure.

Preferably, the slurry backwashing filter device further comprises a slurry inlet pneumatic valve, a slurry backflow pneumatic valve, a slurry outlet pneumatic valve, a backwashing steam inlet pneumatic valve and a deslagging pneumatic valve; the slurry inlet pneumatic valve is arranged at the slurry inlet; the slurry outlet pneumatic valve is arranged at the slurry outlet; the backwashing steam inlet pneumatic valve is arranged at the backwashing steam inlet; the slag discharge pneumatic valve is arranged at the slag discharge port; the slurry backflow pneumatic valve is connected with a slurry pipe in front of the outlet of the slurry pump and the inner part of the groove body of the three-stage groove; the slurry return pneumatic valve is arranged in front of the slurry inlet pneumatic valve and behind the slurry pump; the slurry inlet pneumatic valve, the slurry backflow pneumatic valve, the slurry outlet pneumatic valve, the back-washing steam inlet pneumatic valve and the slag discharging pneumatic valve are all timing or differential pressure automatic switches, when the system needs to be cleaned, the slurry backflow pneumatic valve is opened, the slurry inlet pneumatic valve and the slurry outlet pneumatic valve are closed, and the slag discharging pneumatic valve and the back-washing steam inlet pneumatic valve are opened.

Preferably, the system also comprises a tail gas treatment device connected with each stage of tank, wherein the tail gas treatment device comprises a dynamic wave washing tower, an induced draft fan and a washing tower which are sequentially connected; the dynamic wave washing tower is provided with a dynamic wave washing tower circulating water pump for circulating flow of washing liquid in the dynamic wave washing tower; a washing tower circulating water pump is arranged on the washing tower and is used for circulating the washing liquid in the washing tower; and a chimney for discharging the treated tail gas is arranged at the top of the washing tower.

Advantageous effects

Compared with the prior art, the utility model discloses the beneficial effect who gains as follows:

(1) the slurry preparation device is moved to the position above the ground from the top of the tower, equipment does not need to be installed at the top of the bottom of the tower, and the whole tower body is changed from a structural part into a simple protective part, so that the whole construction cost of the tower body can be greatly reduced;

(2) the back-washing filtering device is arranged to realize the online impurity filtering of the slurry, and the impurities can be automatically discharged at regular intervals without being cleaned manually, so that the labor intensity of workers is reduced;

(3) the tail gas treatment system matched with the slurry preparation device and the equipment are moved to the ground together, so that the length of the air pipe can be shortened, and the investment and the operation cost of the tail gas treatment system are reduced;

(4) the slurry preparation device is moved to the area below the middle part outside the tower body from the top of the tower, so that the lifting height of a matched raw material feeding system is reduced, and the investment and the operation cost of the raw material feeding system are reduced.

Drawings

FIG. 1 is a schematic view of the overall configuration of a slurry preparation apparatus according to example 1 of the present invention;

fig. 2 is a schematic structural view of a primary tank according to embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a secondary tank according to embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a tertiary tank according to embodiment 1 of the present invention;

fig. 5 is a schematic structural view of an exhaust gas treatment device according to embodiment 1 of the present invention;

fig. 6 is a structural view of a filter housing of embodiment 1 of the present invention;

FIG. 7 is a schematic view showing the overall configuration of a slurry preparation apparatus according to example 2 of the present invention;

fig. 8 is a schematic structural view of an evaporative concentration apparatus according to example 2 of the present invention;

the technical characteristics corresponding to the marks in the attached drawings are as follows:

1-a first stage tank; 11-a primary tank body; 12-first order groove discharge valve; 13-first level tank slurry temperature sensor; 14-electric regulating valve for steam inlet of the first-stage groove, 15-steam inlet of the first-stage groove; 16-primary groove overflow port; 17-primary tank stirring device; 171-primary tank stirrer; 172-primary tank agitator drive motor; 18-a primary tank steam outlet; 19-a first slurry pipe;

2-a secondary tank; 21-a secondary tank body; 22-secondary groove discharge valve; 23-a secondary tank slurry temperature sensor; 24-electric regulating valve for steam inlet of secondary tank; 25-a secondary tank steam inlet; 26-secondary tank overflow port; 27-a secondary tank stirring device; 271-a secondary tank stirrer; 272-secondary tank agitator drive motor; 28-secondary tank steam outlet; 29-a second slurry pipe;

3-a three-stage groove; 31-a third-stage groove body; 32-three-stage groove discharge valve; 33-three-stage tank slurry temperature sensor; 34-electric regulating valve for steam inlet of the three-stage groove; 35-a tertiary tank steam inlet; 36-tertiary tank steam inlet; 37-a third-stage tank stirring device; 371-three-stage tank agitator; 372-a third stage tank agitator drive motor;

4-slurry pump;

5-slurry backwashing filter device; 51-slurry inlet pneumatic valves; 52-slurry return pneumatic valve; 53-backwashing the filter body, 531-slurry inlet; 532-a slurry outlet; 533-backwash steam inlet; 534-slag discharge port; 535-filter housing; 536-a filter screen; 54-slurry outlet pneumatic valves; 55-back flushing steam inlet pneumatic valve; 56-slag discharge pneumatic valve;

6-tail gas treatment device; 61-dynamic wave washing tower; 62-dynamic wave washing tower circulating water pump; 63-an induced draft fan; 64-a washing column; 65-washing tower circulating water pump; 66-a chimney;

7-an evaporation concentration device; 71-first stage evaporator; 72-a secondary evaporator; 711-primary evaporator slurry inlet; 712-primary evaporator slurry outlet; 713-first stage evaporator steam inlet; 714-first stage evaporator steam outlet; 715-a first-stage evaporator concentrated gas outlet; 716-a slag discharge port of the primary evaporator; 717-first stage evaporator body; 721-a secondary evaporator slurry inlet; 722-a secondary evaporator slurry outlet; 723-secondary evaporator vapor inlet; 724-steam outlet of the secondary evaporator; 725-outlet of concentrated gas from secondary evaporator; 726-secondary evaporator slag discharge port; 727-second stage evaporator body;

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

example 1

As shown in figure 1, the low-tower granulation slurry preparation device for the fertilizer is arranged in an area below the middle part of a granulation tower, the slurry preparation device is moved to the ground from the top of the tower, equipment does not need to be installed at the top of the tower bottom, the whole tower body is changed from a structural component into a simple protective component, and the whole construction cost of the tower body can be greatly reduced.

The slurry preparation device comprises a multistage groove, a slurry pump 4, a slurry backwashing filter device 5 and a tail gas treatment device 6; the multistage grooves are connected with the tail gas treatment device 6 and used for sending the generated tail gas to the tail gas treatment device 6 for treatment.

As shown in fig. 1, the multistage tank includes a primary tank 1, a secondary tank 2 and a tertiary tank 3 which are connected in sequence; the level of the secondary tank 2 is lower than that of the primary tank 1; the level of the tertiary tank 3 is lower than the level of the secondary tank 2.

As shown in fig. 1, the three-stage tank 3, the slurry pump 4 and the slurry backwashing filter device 5 are connected in sequence;

as shown in fig. 1 and 2, the primary tank 1 includes a primary tank body 11, the primary tank body 11 is a stainless steel closed container with a primary tank stirring device 17 inside, a primary tank coil heating device (not shown in the drawings) is arranged inside the primary tank body 11, and a primary tank jacket heating device (not shown in the drawings) is arranged outside the primary tank body 11; the upper part of the outer side wall of the primary tank body 11 is provided with a primary tank steam inlet 15 communicated with the primary tank coil pipe heating device and the primary tank jacket heating device; introducing steam into the primary tank coil pipe heating device and the primary tank jacket heating device through the primary tank steam inlet 15, and melting the solid raw materials added into the primary tank body 11 into a liquid state; and a primary tank steam inlet adjusting valve 14 is arranged at the primary tank steam inlet 15 and used for adjusting the amount of heating steam.

As shown in fig. 1, a primary tank discharge valve 12 and a primary tank steam outlet 18 are arranged at the bottom of the primary tank body 11, the primary tank discharge valve 12 is located at the center of the bottom of the primary tank body 11, and the primary tank discharge valve 12 is connected with the top of the secondary tank 2 and is used for discharging slurry into the secondary tank 2; the primary groove steam outlet 18 is positioned at the outer side of the primary groove discharge valve 12; a primary tank slurry temperature sensor 13 is arranged at the top of the primary tank body 11; the primary tank slurry temperature sensor 13 is located at the upper part of the primary tank body 11, the detection end of the primary tank slurry temperature sensor is deep into the slurry melted in the primary tank body 11, the temperature of the melted slurry is detected, the primary tank slurry temperature sensor 13 is connected with the primary tank steam inlet adjusting valve 14 in an interlocking manner, and the primary tank steam inlet adjusting valve 14 adjusts the heating steam quantity according to the temperature value detected by the primary tank slurry temperature sensor 13. When the temperature of the slurry is higher than the set height, the opening degree of the first-stage groove steam inlet regulating valve 14 is reduced, the amount of steam for heating is reduced, and therefore the temperature is reduced; when the temperature of the slurry is lower than the set height, the steam inlet regulating valve 14 of the primary tank increases the opening degree and increases the amount of steam for heating, so that the temperature is increased; through interlocking control, the temperature of the slurry in the primary tank 1 is controlled within a proper range, and the process requirements are met.

The primary tank stirring device 17 comprises a primary tank stirrer 171 vertically arranged inside the primary tank body 11 and a primary tank stirrer driving motor 172 vertically arranged outside the top of the primary tank body 11; the upper end of the primary tank stirrer 171 penetrates through the top of the primary tank body 11 and is in driving connection with the primary tank stirrer driving motor 172.

The secondary tank 2 comprises a secondary tank body 21, the secondary tank body 21 is a stainless steel closed container with a secondary tank stirring device 271 inside, a secondary tank coil heating device (not shown in the drawing) is arranged inside the secondary tank body, and a secondary tank jacket heating device is arranged outside the secondary tank body 21; the upper part of the outer side wall of the secondary tank body 21 is provided with a secondary tank steam inlet 25 communicated with the secondary tank coil heating device and the secondary tank jacket heating device; introducing steam into the secondary tank coil heating device and the secondary tank jacket heating device through the secondary tank steam inlet 24, and melting the solid raw material added into the secondary tank body 21 into a liquid state;

as shown in fig. 3, a secondary tank discharge valve 22 and a secondary tank steam outlet 28 are arranged at the bottom of the secondary tank body 21, the secondary tank discharge valve 22 is located at the center of the bottom of the secondary tank body 21, and the secondary tank discharge valve 22 is connected with the top of the tertiary tank 3 and is used for discharging slurry into the tertiary tank 3; the secondary trough steam outlet 28 is located outside the secondary trough discharge valve 22; a second-stage tank slurry temperature sensor 23 is arranged at the top of the second-stage tank body 21; the secondary tank slurry temperature sensor 13 is located at the upper part of the secondary tank body 21, the detection end of the secondary tank slurry temperature sensor extends into the interior of the slurry melted in the secondary tank body 21 and is used for detecting the temperature of the melted slurry, and a secondary tank steam inlet adjusting valve 24 is arranged at the position of the secondary tank steam inlet 24 and is used for adjusting the heating steam quantity. The secondary tank steam inlet adjusting valve 24 is connected with the secondary tank slurry temperature sensor 23 in an interlocking manner, and the secondary tank steam inlet adjusting valve 24 adjusts the amount of heating steam according to the temperature value detected by the secondary tank slurry temperature sensor 23. When the temperature of the slurry is higher than the set height, the opening degree of the steam inlet adjusting valve 24 of the secondary tank is reduced, the amount of steam for heating is reduced, and the temperature is reduced; when the temperature of the slurry is lower than the set height, the steam inlet adjusting valve 24 of the secondary tank increases the opening degree and increases the amount of steam for heating, so that the temperature is increased; and the temperature of the slurry in the secondary tank 2 is controlled in a proper range through interlocking control, so that the process requirements are met.

As shown in fig. 1 and 3, the secondary tank stirring device 27 includes a secondary tank stirrer 271 vertically disposed inside the secondary tank body 2 and a secondary tank stirrer driving motor 272 vertically disposed outside the top of the secondary tank body 2; the upper end of the secondary tank stirrer 272 penetrates through the top of the secondary tank body 2 and is in driving connection with the secondary tank stirrer driving motor 272.

As shown in fig. 1 and 4, the tertiary tank 3 includes a tertiary tank body 31, the tertiary tank body 31 is a stainless steel closed container with a tertiary tank stirring device 37 inside, and a tertiary tank jacket heating device (not shown in the drawings) is arranged outside the tertiary tank body 31; the upper part of the outer side wall of the third-stage groove body 31 is provided with a third-stage groove steam inlet 35 communicated with the third-stage groove jacket heating device; introducing steam into the jacket heating device of the third-stage tank through the steam inlet 35 of the third-stage tank, and melting the solid raw materials added into the tank body 31 of the third-stage tank into a liquid state;

as shown in fig. 1 and 4, a tertiary tank discharge valve 32 and a tertiary tank steam outlet 36 are arranged at the bottom of the tertiary tank body 31, the tertiary tank discharge valve is located at the center of the bottom of the tertiary tank body 31, and the tertiary tank discharge valve 32 is connected with the slurry pump 4 and is used for discharging slurry into the slurry pump 4; the tertiary tank steam outlet 36 is positioned outside the tertiary tank discharge valve 32; a third-stage tank slurry temperature sensor 33 is arranged at the top of the third-stage tank body 31; the third-stage tank slurry temperature sensor 33 is positioned at the upper part of the third-stage tank body 31, and the detection end of the third-stage tank slurry temperature sensor extends into the slurry melted in the third-stage tank body 31 and is used for detecting the temperature of the melted slurry; and a tertiary tank steam inlet adjusting valve 34 is arranged at the tertiary tank steam inlet 36 and used for adjusting the amount of the heating steam. The three-stage tank steam inlet adjusting valve 34 is connected with the three-stage tank slurry temperature sensor 33 in an interlocking manner, and the three-stage tank steam inlet adjusting valve 34 adjusts the amount of heating steam according to the temperature value detected by the first-stage tank slurry temperature sensor 33. When the temperature of the slurry is higher than the set height, the opening degree of the steam inlet adjusting valve 34 of the third-stage tank is reduced, the amount of steam for heating is reduced, and the temperature is reduced; when the temperature of the slurry is lower than the set height, the steam inlet regulating valve 34 of the third-stage tank increases the opening degree and increases the amount of steam for heating, so that the temperature is increased; the temperature of the slurry in the three-stage tank 3 is controlled within a certain range through interlocking control, and the process requirements are met.

As shown in fig. 1, the tertiary tank stirring device 37 includes a tertiary tank stirrer 371 vertically disposed inside the tertiary tank body 31 and a tertiary tank stirrer driving motor 372 vertically disposed outside the top of the tertiary tank body 31; the upper end of the third-stage groove stirrer 371 penetrates through the top of the third-stage groove body 31 and is in driving connection with the third-stage groove stirrer driving motor 372. The triple-pole tank stirrer 371 stirs the slurry formed after melting to form a final mixed melt under the driving of the triple-pole tank stirrer driving motor 372.

The coil heating device and the three-stage groove jacket heating device of each stage of groove are the existing heating coil and heating jacket.

As shown in fig. 1 to 3, further comprising a first slurry pipe 19 for connecting the lower portion of the primary tank 1 and the top of the secondary tank 2 and a second slurry pipe 29 for connecting the lower portion of the secondary tank 2 and the top of the tertiary tank 3; the first slurry pipe 19 and the second slurry pipe 29 are consistent in shape and size; the first slurry pipe 19 and the second slurry pipe 29 respectively comprise a first connecting part and a second connecting part which are connected with each other, the first connecting parts are arranged in an upward inclined manner and are connected with corresponding overflow ports, and the highest position of the first connecting parts is 100mm higher than the top of the coil pipe in the corresponding tank body; the second connecting portion is vertically arranged downwards and communicated with the corresponding groove body. The melted slurry in the primary tank 1 flows out through a primary tank overflow port 16 on the side wall of the primary tank body 11, the flowing slurry moves upwards for a certain distance along a first slurry pipe 19 and then falls into the secondary tank 2, and the liquid level of the slurry in the primary tank 1 is kept above at least 100mm of a coil pipe in the primary tank 1 by utilizing the principle of fluid level when the slurry moves upwards for a certain distance; when the slurry level in the primary tank 11 exceeds the top of the upward first slurry pipe 19, the molten slurry in the primary tank 1 flows into the secondary tank 2 by itself. The ground paste after the completion of the melting in the secondary tank 2 flows out through the secondary tank overflow port 26 on the side wall of the secondary tank body 21, the flowing-out ground paste moves upwards for a certain distance along the second ground paste pipe 29 and then falls into the tertiary tank 3, so that the ground paste liquid level in the secondary tank 2 is kept above at least 100mm of the coil pipe in the secondary tank 1 by utilizing the principle of fluid level when the distance of the upward movement is a certain distance, and when the ground paste level in the secondary tank 2 exceeds the top point of the upward second ground paste pipe, the ground paste melted in the secondary tank 2 can automatically flow into the tertiary tank 3.

As shown in fig. 1, the slurry pump 4 is a horizontal slurry pump, the head of the horizontal slurry pump can reach 40-60m, the inlet of the horizontal slurry pump is connected with the discharge valve 32 of the tertiary tank, and the outlet of the horizontal slurry pump is connected with the slurry back-flushing filtering device 5; the slurry pump 4 pumps the slurry flowing out of the three-pole groove discharge valve 32 at the bottom of the three-pole groove 3 to the slurry backwashing filter device 5 for filtering, and the filtered slurry is sent to the granulator.

As shown in fig. 1 and 6, the slurry backwashing filter device 5 includes a backwashing filter body 53, the backwashing filter body is a stainless steel closed container, the backwashing filter body 53 includes a filter housing 535, a slurry inlet 531 and a slurry outlet 532 are disposed on a side wall of the filter housing 535, and a backwashing steam inlet 533 and a slag discharge outlet 534 are disposed at the top and bottom of the filter housing 535, respectively; the filter housing 535 is provided with a filter screen 536 inside, the filter screen 536 is a pore plate type inverted cup structure. The inside of the filter screen 536 is in communication with the slurry inlet 531 and the outside of the filter screen 536 is in communication with the slurry outlet 532.

As shown in fig. 3, the slurry backwash filter apparatus further comprises a slurry inlet pneumatic valve 51, a slurry return pneumatic valve 52, a slurry outlet pneumatic valve 54, a backwash steam inlet pneumatic valve 55 and a reject pneumatic valve 56; the slurry inlet pneumatic valve 51 is arranged at the slurry inlet 531; the slurry outlet pneumatic valve 54 is disposed at the slurry outlet 532; the backwash steam inlet pneumatic valve 55 is arranged at the backwash steam inlet 533; the slag discharge pneumatic valve 56 is arranged at the slag discharge port 534; the slurry backflow pneumatic valve 52 is connected with a slurry pipe in front of the outlet of the slurry pump 4 and the inside of the groove body 31 of the three-stage groove 3; the slurry return pneumatic valve 52 is disposed before the slurry inlet pneumatic valve 51 and after the slurry pump 4; the slurry inlet pneumatic valve 51, the slurry return pneumatic valve 52, the slurry outlet pneumatic valve 54, the backwash steam inlet pneumatic valve 55 and the slag discharge pneumatic valve 56 are all timing or differential pressure automatic switches, and the slurry backwash filter device 5 can be cleaned automatically at timing or according to differential pressure; when the system needs cleaning, slurry return pneumatic valve 52 is opened, slurry inlet pneumatic valve 51 and slurry outlet pneumatic valve 54 are closed, and blowdown pneumatic valve 56 and backwash steam inlet pneumatic valve 55 are opened.

As shown in fig. 1 and 2, the tail gas treatment device 6 includes a dynamic wave washing tower 61, an induced draft fan 63, and a washing tower 64 connected in sequence; a dynamic wave washing tower circulating water pump 62 is arranged on the dynamic wave washing tower 61 and is used for circulating the washing liquid in the dynamic wave washing tower 61; a washing tower circulating water pump 65 is arranged on the washing tower 64 and is used for circulating the washing liquid in the washing tower 65; the top of the scrubber 65 is provided with a stack 66 for discharging the treated off-gas. The tail gas generated by each groove body is gathered together by the air pipe and enters the dynamic wave washing tower, and the dynamic wave washing tower adopts a two-stage series connection type, so that the dust removal efficiency is higher. The tail gas washed by the dynamic wave washing tower is conveyed to the washing tower through the induced draft fan for secondary washing, the tail gas after secondary washing is directly exhausted along the chimney 66, two-stage washing is carried out in a mode that the dynamic wave washing tower 61 and the washing tower 64 are connected in series, and the washing effect can be ensured to completely meet the increasingly severe environmental protection requirement.

The working principle of the present invention is described in detail below:

after the solid raw materials used by the primary tank 1 are put into the primary tank body 11, the solid raw materials are melted into a liquid state under the action of the coil pipe in the primary tank and high-temperature steam in the shell, and the solid raw materials can be melted more quickly and uniformly by starting the primary tank stirring device 17 in the primary tank 11; the primary tank steam inlet adjusting valve 14 adjusts the heating steam flow according to the slurry temperature detected by the primary tank slurry temperature sensor 13, the slurry melted in the primary tank flows out through the primary tank overflow port 16 on the side wall of the primary tank body 11, the flowing slurry moves upwards for a certain distance along the first slurry pipe 19 and then falls into the secondary tank 2, and when the slurry liquid level in the primary tank exceeds the top point of the upward slurry pipe, the melted slurry in the primary tank can automatically flow into the secondary tank 2; when the apparatus is stopped, the primary tank discharge valve 12 at the bottom of the primary tank 1 is opened, and the slurry is completely discharged into the secondary tank 2.

The slurry discharged from the primary tank 1 flows into the secondary tank 2 and then is mixed with the solid raw material put into the secondary tank 2 by stirring, and simultaneously is completely melted into liquid under the action of high-temperature steam in the coil pipe of the secondary tank body 21 and the jacket of the shell, and when the slurry level in the secondary tank 2 exceeds the top point of the upward slurry pipe, the melted slurry in the secondary tank 2 automatically flows into the tertiary tank 3. When the device is stopped, a discharge valve at the bottom of the secondary tank 2 is opened, and the slurry is completely discharged into the tertiary tank 3.

Slurry discharged from the secondary tank 2 flows into the tertiary tank 3 and then is mixed with solid raw materials thrown into the tertiary tank 3 through stirring, the slurry fully mixed in the tertiary tank 3 flows into a slurry pump 4 through a discharge valve at the bottom of the tertiary tank 3, the slurry flowing into the tertiary tank 3 is sent to a slurry backwashing filter device 5 through the slurry pump 4, and is filtered by a filter screen 536 and then is sent to the granulator for centrifugal granulation;

when the slurry backwashing filter device 5 needs to be cleaned, the slurry backflow pneumatic valve 52 is opened and the slurry inlet pneumatic valve 51 is closed, the slurry is conveyed to the three-stage tank 3 along the backflow pipe at the moment, the system is normally started without shutdown, then the slurry outlet pneumatic valve 54 is closed and the slag discharging pneumatic valve 56 is opened, the backwashing filter body 53 is isolated from the slurry, the backwashing steam inlet pneumatic valve 55 is opened, impurities adsorbed on the inner wall of the filter screen 536 are washed away from the filter screen 536 by high-temperature high-speed steam, and the impurities flow into a designated position along the slag discharging port 534 and the slag discharging pneumatic valve 56.

The tail gas generated by each tank body is gathered together by an air pipe and sequentially enters a dynamic wave washing tower and a washing tower, and the tail gas is directly exhausted along a chimney 66 after secondary washing, so that the environment-friendly washing tank is environment-friendly and pollution-free.

The slurry preparation device provided by the invention is arranged at the bottom of the tower, is used for reducing the height and the construction cost of the granulation tower, and can also be arranged at the top of the granulation tower, so that a slurry pump can be removed, and a back-washing filter device is reserved.

Example 2:

as shown in fig. 7 and 8, the main technical solution of this embodiment and embodiment 1, the features that are not explained in this embodiment, adopt the explanation in embodiment 1, and are not described herein again. This example differs from example 1 in that: the slurry fully mixed in the tertiary tank 3 flows into a slurry pump 4 through a discharge valve at the bottom of the tertiary tank 3, the slurry flowing in the tertiary tank 3 is sent to an evaporation concentration device 7 through the slurry pump 4, and is pumped into the granulator for centrifugal granulation after evaporation concentration;

as shown in fig. 7 and 8, the evaporation concentration device 7 includes a primary evaporator 71 and a secondary evaporator 72; the primary evaporator 71 includes a primary evaporator body 717; be equipped with one-level evaporator ground paste import 711, one-level evaporator ground paste export 712, one-level evaporator steam inlet 713, one-level evaporator steam outlet 714 on the lateral wall of one-level evaporator body 717, the top of one-level evaporator body 717 is equipped with one-level evaporator concentrated gas export 715, one-level evaporator body 717 bottom is equipped with one-level evaporator row cinder notch 716. The primary evaporator body 717 is a tubular heat exchanger, steam is introduced into the tube, and slurry to be concentrated is outside the tube; the steam inlet and outlet are respectively a first-stage evaporator steam inlet 713 and a first-stage evaporator steam outlet 714; the inlet and outlet of the slurry to be concentrated are a first-stage evaporator slurry inlet 711 and a first-stage evaporator slurry outlet 712 respectively.

As shown in fig. 7 and 8, the secondary evaporator 72 includes a secondary evaporator body 727; a secondary evaporator slurry inlet 721, a secondary evaporator slurry outlet 722, a secondary evaporator steam inlet 723 and a secondary evaporator steam outlet 724 are arranged on the side wall of the secondary evaporator body 727, a secondary evaporator concentrated gas outlet 725 is arranged at the top of the secondary evaporator body 727, and a secondary evaporator slag discharge port 726 is arranged at the bottom of the secondary evaporator body 727. The body 727 of the secondary evaporator is a tubular heat exchanger, steam is introduced into the tube, and slurry to be concentrated is outside the tube; the inlet and outlet of the steam are respectively a steam inlet 723 and a steam outlet 724 of the secondary evaporator; the inlet and outlet of the slurry to be concentrated are a second stage evaporator slurry inlet 721 and a second stage evaporator slurry outlet 722, respectively.

The working principle is as follows: in a fertilizer low-tower granulation system, slurry is viscous when some fertilizer products are produced, the viscous slurry is easy to cause the phenomena of wall adhesion, pipe blockage and the like in the pipeline conveying process, and the fertilizer slurry has great potential safety hazard when being in a high-temperature closed pipeline for a long time. The measure for solving the problems in the embodiment is that when a product with higher viscosity is produced, part of water is added into the three-stage tank 3 to dilute the slurry, so that the phenomena of wall sticking, pipe blocking and the like do not exist in the slurry conveying process, the slurry is concentrated before entering a granulator, the added water is evaporated, and the concentrated slurry is immediately granulated.

The evaporator is a heat exchanger, slurry and steam are subjected to heat exchange in the evaporator, moisture in the material is changed into gas state and separated out, the concentration of the slurry is improved, and the purpose of evaporation concentration is achieved. In order to save heating steam and reduce the occupied area of equipment, multi-stage evaporation is generally adopted. In the embodiment, a two-stage evaporation and concentration process is selected; alternatively, a multi-stage concentration process may be used. The diluted slurry enters the primary evaporator 71 from a primary evaporator slurry inlet 711, a plurality of rows of pipelines are arranged in the primary evaporator 71, the inlets and the outlets of the pipelines are respectively connected with a primary evaporator steam inlet 713 and a primary evaporator steam outlet 714, and steam is introduced into the pipelines to ensure that the diluted slurry is in a high-temperature state. The thin slurry entering the first-stage evaporator 71 gradually volatilizes excess moisture at high temperature, and the slurry gradually thickens as the moisture gradually volatilizes. The volatilized water is discharged from a concentrated gas outlet 715 of the primary evaporator, and impurity hard substances in the slurry are discharged from a slag discharge port 716 of the primary evaporator. The slurry evaporated and concentrated by the primary evaporator 71 is discharged from a slurry outlet 712 of the primary evaporator and enters the secondary evaporator 72 through an inlet 721 of the secondary evaporator, a plurality of rows of pipelines are arranged in the secondary evaporator 72, the inlets and the outlets of the pipelines are respectively connected with a steam inlet 723 of the secondary evaporator and a steam outlet 724 of the secondary evaporator, and steam is introduced into the pipelines to ensure that the dilute slurry is in a high-temperature state. The excess water in the dilute slurry entering the second-stage evaporator 72 is gradually volatilized at high temperature, and when the water content is reduced to be below the highest water content required by granulation, the slurry is sent into a low-tower granulator from an outlet 722 of the second-stage evaporator for granulation. The water volatilized from the slurry in the secondary evaporator 72 is discharged from the concentrated gas outlet 725 of the secondary evaporator, and the impurity hard substances in the slurry are discharged from the slag discharge port 726 of the secondary evaporator.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the scope of protection is not limited to the specific embodiments disclosed and described above, and some modifications and variations to the claims should fall within the scope of the invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A fertilizer low tower granulation slurry preparation device is characterized by comprising a slurry preparation device arranged in the area below the middle part of a granulation tower, wherein the slurry preparation device comprises a multistage tank and a slurry pump;

the multistage grooves are sequentially connected, the horizontal height of the next-stage groove is lower than that of the previous-stage groove, and the lowest-stage groove is connected with a slurry pump;

solid raw materials are put in each stage of tank, the solid raw materials put in the previous stage of tank are heated and melted at high temperature to form liquid slurry to be overflowed or discharged into the next stage of tank, the liquid slurry is mixed with the solid raw materials melted in the next stage of tank to form mixed melt, the mixed melt is melted and mixed step by step in sequence, final mixed slurry is formed in the next stage of tank, and the final mixed slurry is sent into a granulation tower through the slurry pump.

2. The apparatus for preparing a low tower granulation slurry of fertilizer as claimed in claim 1, wherein said multi-stage tank comprises a primary tank, a secondary tank and a tertiary tank connected in sequence; the horizontal height of the secondary groove is lower than that of the primary groove; the level of the tertiary tank is lower than that of the secondary tank.

3. The fertilizer low-tower granulation slurry preparation device as claimed in claim 2, wherein the primary tank, the secondary tank and the tertiary tank comprise tank bodies, the tank bodies are stainless steel closed containers with stirring devices inside, coil pipe heating devices are arranged inside the tank bodies of the primary tank and the secondary tank, and jacket heating devices are arranged outside the tank bodies of the primary tank, the secondary tank and the tertiary tank; the upper part of the outer side wall of the tank body is provided with a steam inlet communicated with the coil heating device and the jacket heating device; introducing steam into the coil heating device and the jacket heating device through the steam inlet, and melting the solid raw materials added into the groove body into liquid slurry; and a steam inlet adjusting valve is arranged at the steam inlet and used for adjusting the amount of the heating steam.

4. The fertilizer low tower granulation slurry preparation device as claimed in claim 3, wherein a discharge valve and a steam outlet are arranged at the bottom of the tank body, the discharge valve is positioned at the center of the bottom of the tank body, and the discharge valve of the upper stage tank is connected with the top of the lower stage tank and is used for discharging slurry into the lower stage tank; a slurry temperature sensor is arranged at the top of the tank body; the slurry temperature sensor is positioned at the upper part of the tank body, the detection end of the slurry temperature sensor extends into the slurry melted in the tank body and is used for detecting the temperature of the melted slurry, the slurry temperature sensor is connected with the steam inlet adjusting valve in an interlocking manner, and the steam inlet adjusting valve adjusts the heating steam quantity according to the temperature value detected by the slurry temperature sensor; overflow ports communicated with the inside of the primary groove and the secondary groove are obliquely arranged on the side walls of the bottoms of the primary groove and the secondary groove.

5. The fertilizer low tower granulation slurry preparation device as claimed in claim 4, wherein said stirring device comprises a stirrer vertically arranged inside said tank and a driving motor vertically arranged outside the top of said tank; the upper end of the stirrer penetrates through the top of the tank body and is in driving connection with the driving motor.

6. The apparatus for preparing a low tower granulated slurry for fertilizer according to claim 3, further comprising a first slurry pipe for connecting the lower portion of the side wall of the primary tank and the top of the secondary tank and a second slurry pipe for connecting the lower portion of the side wall of the secondary tank and the top of the tertiary tank; the shapes and the sizes of the first slurry pipe and the second slurry pipe are consistent; the first slurry pipe and the second slurry pipe respectively comprise a first connecting part and a second connecting part which are connected with each other, the first connecting parts are arranged in an upward inclined manner and are connected with corresponding overflow ports, and the highest positions of the first connecting parts are higher than the height of the coil pipes in the corresponding tank body by 100 mm; the second connecting portion is vertically arranged downwards and communicated with the inside of the corresponding groove body.

7. The apparatus of claim 6, further comprising a slurry backwash filter connected to the slurry pump, wherein the slurry pump is a horizontal slurry pump, an inlet of the horizontal slurry pump is connected to the discharge valve at the bottom of the tertiary tank, and an outlet of the horizontal slurry pump is connected to the slurry backwash filter; and the slurry pump sends the slurry flowing out of the discharge valve at the bottom of the three-stage tank to a slurry backwashing filter device for filtering, and sends the filtered slurry to the granulation tower.

8. The apparatus of claim 7, wherein the slurry pump delivers the final mixed slurry to the slurry backwash filter device for filtration and then to the prilling tower; the slurry backwashing filter device comprises a backwashing filter body, the backwashing filter body is a stainless steel closed container, the backwashing filter body comprises a filter shell, a slurry inlet and a slurry outlet are formed in the side wall of the filter shell, and a backwashing steam inlet and a slag discharge port are respectively formed in the top and the bottom of the filter shell; a filter screen is arranged in the filter shell and is of a pore plate type inverted cup-shaped structure.

9. The apparatus of claim 8, wherein said slurry backwash filter further comprises a slurry inlet pneumatic valve, a slurry return pneumatic valve, a slurry outlet pneumatic valve, a backwash steam inlet pneumatic valve, and a blowdown pneumatic valve; the slurry inlet pneumatic valve is arranged at the slurry inlet; the slurry outlet pneumatic valve is arranged at the slurry outlet; the backwashing steam inlet pneumatic valve is arranged at the backwashing steam inlet; the slag discharge pneumatic valve is arranged at the slag discharge port; the slurry backflow pneumatic valve is connected with a slurry pipe in front of the outlet of the slurry pump and the inner part of the groove body of the three-stage groove; the slurry return pneumatic valve is arranged in front of the slurry inlet pneumatic valve and behind the slurry pump; the slurry inlet pneumatic valve, the slurry backflow pneumatic valve, the slurry outlet pneumatic valve, the back-washing steam inlet pneumatic valve and the slag discharging pneumatic valve are all timing or differential pressure automatic switches, when cleaning is needed, the slurry backflow pneumatic valve is opened, the slurry inlet pneumatic valve and the slurry outlet pneumatic valve are closed, and the slag discharging pneumatic valve and the back-washing steam inlet pneumatic valve are opened.

10. The apparatus of claim 5, further comprising a tail gas treatment device connected to each stage of tank, comprising a dynamic wave scrubber, a draught fan, a scrubber connected in sequence; the dynamic wave washing tower is provided with a dynamic wave washing tower circulating water pump for circulating flow of washing liquid in the dynamic wave washing tower; a washing tower circulating water pump is arranged on the washing tower and is used for circulating the washing liquid in the washing tower; and a chimney for discharging the treated tail gas is arranged at the top of the washing tower.

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