CN214437919U - Desulfurization dust collector suitable for expanded ammonium nitrate explosive wood flour drying process - Google Patents

Abstract

The utility model discloses a desulfurization dust collector suitable for drying of popped ammonium nitrate explosive wood flour, one-level desulfurizing tower use the dust removal as leading, and the desulfurization is for assisting, and the second grade desulfurizing tower uses the desulfurization as leading, and the dust removal is for assisting, and it has the pressure drop and hangs down, and atomization effect is good, and the water spray is even, and gas-liquid flow is big, and operation elasticity is wide, and desulfurization efficiency is high, is difficult for blockking up, and efficiency is stable. On the other hand, the drying furnace adopts the watering dust fall method to come the wood dust that mix with in the vapor, modifies flue inclination to at flue internally mounted spiral nozzle, to inside watering gets rid of wood dust, and the waste water of production collects and goes into sewage treatment system and handle back recycle after gathering to the sedimentation tank after, the utility model discloses discharge such as smoke and dust, SO2 in the reduction drying furnace waste gas reduces wood dust in the vapor, protects the surrounding atmosphere environment, reduces and influences peripheral resident.

Description

Desulfurization dust collector suitable for expanded ammonium nitrate explosive wood flour drying process

Technical Field

The utility model relates to a chemical waste gas treatment equipment technical field specifically is a desulfurization dust collector suitable for expanded ammonium nitrate explosive wood flour drying process.

Background

The production process of the expanded ammonium nitrate explosive needs to add wood powder as a reducing agent, the wood powder is supplied with heat by using fire coal in the preparation process, the coal contains certain sulfur and ash, a certain amount of pollutants such as SO2, nitrogen oxides, smoke dust and the like are generated in the high-temperature combustion process, and a certain amount of pollutants such as SO2, nitrogen oxides, smoke dust and the like are discharged in the operation process. Wood dust is mixed with water vapor generated by the drying oven when wood powder is baked, and a small amount of lighter wood dust is discharged together with the water vapor under the action of a chimney effect when the water vapor is discharged. At present, the drying furnace is provided with two exhaust ports of waste gas and steam, the exhaust modes are direct exhaust, and certain environmental pollution risk exists to the surrounding atmospheric environment. The existing desulfurization dust removal device can not carry out good unification treatment on wood powder and waste gas at the same time in a reasonable and efficient manner.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies and drawbacks of the prior art, the inventor provides a new solution, specifically, the present invention provides a method for implementing: the utility model provides a desulfurization dust collector suitable for drying of popped ammonium nitrate explosive wood flour, one-level desulfurizing tower including interconnect, the second grade desulfurizing tower, the bottom of second grade desulfurizing tower is equipped with the exhanst gas outlet, the top of one-level desulfurizing tower and second grade desulfurizing tower all is equipped with the buck water inlet, the bottom all is equipped with the exhanst gas outlet, the exhanst gas outlet is connected to the waste water calandria, the exhanst gas outlet communicates to the exhaust-gas discharge pipe, exhaust-gas discharge pipe is connected to the chimney, be provided with at least one vapor delivery pipe in the chimney, the slope of vapor delivery pipe upwards extends to the chimney outside, install at least one spiral sprinkler bead in vapor delivery pipe inside top, the spiral sprinkler bead can spray vapor delivery pipe inner region, the other end of vapor delivery pipe is connected to the drying furnace.

Furthermore, the exhaust emission pipe is connected to the chimney through an induced draft fan, or two induced draft fans connected in parallel, and the controllable tee pipe joint is selected for use in the parallel connection department and is connected.

Furthermore, the inner wall of the pipeline of the water vapor discharge pipe is coated with epoxy resin paint, and the spiral water spray head is arranged in the water vapor discharge pipe and sprays in the transverse direction, wherein the spraying direction is opposite to the water vapor discharge direction.

Furthermore, the first-stage desulfurizing tower is a cylindrical tower body, a first main spraying pipe longitudinally extends from the top to the middle part in the tower, and a plurality of nozzles with different lengths are arranged at the tail end of the first main spraying pipe; or the number of the nozzles is three, and the nozzles are arranged according to the different heights of the upper layer, the middle layer and the lower layer formed by the lengths.

Further, the second grade desulfurizing tower is cylindrical tower body, is provided with the waste gas intake pipe vertically downwards in the tower, and a plurality of air inlet has been seted up to the middle part at the top of waste gas intake pipe, installs the female pipe of second spraying in the tower, and the female pipe of second spraying corresponds every air inlet and sprays towards the outside, and the bottom of waste gas intake pipe is connected to waste gas discharge pipe.

Furthermore, the first spraying main pipe is made of stainless steel materials, and the nozzle is a stainless steel spiral nozzle.

Further, the bottom of chimney is equipped with the outlet, and the outlet is connected to the collecting pit of externally mounted, and the collecting pit is connected to the waste water calandria, and the sewage treatment system is gone into in the final connection of waste water calandria.

The utility model discloses a theory of operation introduces:

the waste gas of the drying furnace is used for removing pollutants such as sulfur dioxide in the flue gas by a lime-gypsum method water film desulfurization technology, and the basic principle is that lime or limestone slurry is used for absorbing SO2 in the flue gas to generate calcium sulfite firstly, and then the calcium sulfite is oxidized into calcium sulfate. The drying furnace adopts a watering dust-settling method to remove wood dust mixed in water vapor, a spiral spray head is arranged in the chimney, water is sprayed to the inside to remove the wood dust, and the generated wastewater is collected to a sedimentation tank and then pumped into a sewage treatment system for treatment and then is recycled.

The desulfurizing tower is a cylindrical tower body, and various spraying main pipes made of different materials and nozzles made of different materials are arranged in the tower according to requirements and are divided into an upper layer, a middle layer and a lower layer. The spraying main pipe is made of stainless steel, and the nozzle is a stainless steel spiral nozzle. When the tower works, smoke enters from the bottom of the tower body, and alkaline absorption liquid is pumped into the main spraying pipe by a pump and is uniformly sprayed out from the upper part of the tower body through the nozzle. At the moment, the sprayed alkaline absorption liquid is fully contacted with the upward-flowing flue gas, the alkaline lime slurry liquid drops and the liquid mist are violently collided with SO2 in the flue gas, CaSO3 or Ca (HSO3)2 or a small amount of CaSO4 and the like are generated through reaction, and the subsequent liquid flows to the bottom of the tower body to be converged into a sedimentation tank and then is pumped into a sewage treatment system for treatment and recycling. The desulfurizing tower divides into the two-stage desulfurization, and the one-level desulfurizing tower uses the dust removal as main, and the desulfurization is for assisting, and the second grade desulfurizing tower uses the desulfurization as main, and the dust removal is for assisting, and it has the pressure drop to reduce, and atomization effect is good, and the water spray is even, and gas-liquid flow flux is big, and operation elasticity is wide, and desulfurization efficiency is high, difficult jam, and efficiency is stable. On the other side, the drying furnace adopts a watering dust-settling method to remove wood dust mixed in the water vapor, the inclination angle of the flue is modified, a spiral spray head is arranged in the flue, water is sprayed to the inside to remove the wood dust, and the generated wastewater is collected to a sedimentation tank and then pumped into a sewage treatment system for treatment and then is recycled.

The utility model has the advantages that:

(1) can realize the technological system that removes sulphur simultaneously and strain wooden dust, by the utility model discloses well two-stage desulfurizing tower's structural design for one-level desulfurizing tower is main with the dust removal, and the desulfurization is for assisting, and the second grade desulfurizing tower is main with the desulfurization, and the dust removal is for assisting, and the two effectual effect of accomplishing desulfurization and dust removal, the desorption rate is good.

(2) The structure equipment combination scientific and reasonable can handle atmospheric pollutants such as SO2, nitrogen oxide, smoke and dust that produce, and discharge and effectively reduce emission concentration up to standard to there is certain dust removal effect to the wood flour dirt in the vapor.

(3) In the process of removing wood dust in water vapor, water liquid can be prevented from flowing backwards, gas-liquid separation and centralized treatment are realized, and the environment is protected.

Drawings

FIG. 1 is a schematic diagram of a desulfurization process;

FIG. 2 is a schematic illustration of wood dust removal;

FIG. 3 is a schematic structural diagram of the device of the present invention;

FIG. 4 is a schematic view showing an installation structure of a water vapor discharge pipe;

FIG. 5 is a graph showing experimental alignment in examples;

wherein: 1-first-stage desulfurizing tower, 11-first spray main pipe, 12-spray nozzle,

2-two-stage desulfurizing tower, 21-waste gas inlet pipe, 22-second spray main pipe, 23-gas inlet,

3-waste gas outlet, 4-alkaline water inlet, 5-waste water outlet, 6-waste water calandria,

7-exhaust gas discharge pipe, 71-induced draft fan, 72-controllable three-way air pipe joint,

8-chimney, 81-water outlet, 82-collecting tank,

9-steam discharge pipe, 91-spiral sprinkler head.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Example 1: the utility model provides a desulfurization dust collector suitable for drying of popped ammonium nitrate explosive wood flour, one-level desulfurizing tower 1 including interconnect, second grade desulfurizing tower 2, the bottom of second grade desulfurizing tower 2 is equipped with exhanst gas outlet 3, the top of one-level desulfurizing tower 1 and second grade desulfurizing tower 2 all is equipped with buck water inlet 4, the bottom all is equipped with waste water outlet 5, waste water outlet 5 is connected to waste water calandria 6, 3 intercommunication of waste gas outlet communicate to exhaust pipe 7, exhaust pipe 7 is connected to chimney 8, be provided with at least one vapor delivery pipe 9 in the chimney 8, the slope of vapor delivery pipe 9 upwards extends to the chimney 8 outside, install at least one spiral water jet 91 in the inside top of vapor delivery pipe 9, spiral water jet 91 can spray the inside region of vapor delivery pipe 9, the other end of vapor delivery pipe 9 is connected to the drying furnace. The exhaust gas discharge pipe 7 is connected to the chimney 8 through one induced draft fan 71 or two induced draft fans 71 connected in parallel, and the parallel connection position is connected through a controllable three-way pipe joint 72. When the device is actually used, waste gas in a drying furnace enters the bottom of a primary desulfurization tower 1 through a flue, the waste gas is uniformly sprayed by alkaline water from an alkaline water inlet 4 in the upward movement process, the primary desulfurization tower 1 is a cylindrical tower body, a first main spraying pipe 11 longitudinally extends towards the middle part from the top in the tower, the first main spraying pipe 11 is connected to the alkaline water inlet 4, three nozzles 12 with different lengths are installed at the tail end of the first main spraying pipe 11, and the three nozzles are arranged according to the different heights of an upper layer, a middle layer and a lower layer formed by the lengths; most dust and partial sulfur-containing waste gas are eliminated by the waste gas after three-stage spraying, the waste gas enters the bottom of the second-stage desulfurizing tower 2 from the upper part of the first-stage desulfurizing tower 1 through a pipeline connecting the two desulfurizing towers, and the waste water enters a waste water discharge pipe 6 from a waste water outlet 5; the secondary desulfurization tower 2 is a cylindrical tower body, a waste gas inlet pipe 21 is longitudinally and downwards arranged in the tower, a plurality of gas inlets 23 are formed from the top to the middle of the waste gas inlet pipe 21, a second spraying main pipe 22 is installed in the tower, the second spraying main pipe 22 sprays outwards corresponding to each gas inlet 23, and the bottom of the waste gas inlet pipe 21 is connected to a waste gas discharge pipe 7; the waste gas moves upwards, and needs to enter from the gas inlet 23 of the waste gas inlet pipe 21, when entering, the waste gas is sprayed by the spray nozzles 12 which are arranged on each gas inlet 23 through the second spray main pipe 22 and spray towards the outer side, and then enters the gas inlet 23 after being sprayed, and finally enters the waste gas discharge pipe 7, and the waste water enters the waste water discharge pipe 6 from the waste water outlet 5; the waste gas is sucked into the chimney 8 for emission under the action of the draught fans 71, when the emission is large, the two draught fans 71 can be opened, the controllable three-way air pipe joint 72 is opened through the parallel air pipes, the two draught fans 71 work simultaneously, the exhaust gas can be quickly sucked into the chimney 8, meanwhile, the steam generated by the drying furnace enters the chimney 8 through the steam exhaust pipe 9 for emission, the spiral sprinkler head 91 is installed in the water vapor discharge pipe 9 to spray in a transverse direction while passing through the water vapor discharge pipe 9, and the spraying direction is opposite to the water vapor discharge direction, therefore, the water vapor of the relative impact is fully contacted with the water mist, a large amount of wood dust can be carried away, the bottom of the chimney 8 is provided with a water outlet 81, the water outlet 81 is connected to an externally mounted collecting tank 82, the collecting tank 82 is connected to the waste water discharge pipe 6, and the waste water discharge pipe 6 is finally connected into a sewage treatment system.

To summarize: the utility model discloses the waste gas treatment measure who brings mainly includes:

(1) desulfurization and dust removal of waste gas

The flue gas generated by the drying furnace enters the desulfurizing tower through the flue, sulfur dioxide in the flue gas reacts with alkali liquor, smoke dust is dissolved in water, and the purified flue gas is discharged to the atmosphere through the chimney 8, so that the aims of desulfurizing and removing the smoke dust are fulfilled. The process flow diagram is shown in FIG. 1;

the water for desulfurization and dust removal of the drying furnace is taken from the water (containing quicklime and sodium hydroxide) for desulfurization and dust removal of a boiler room, two circulating pumps are supplied to a desulfurizing tower of the boiler room, one circulating pump is used for standby during production, a three-way valve is additionally arranged on a water supply pipeline at the desulfurizing tower to introduce water into the desulfurizing tower of the drying furnace, and the water is sprayed by the desulfurizing tower. The desulfurizing tower is composed of two stages, wherein the first stage mainly removes dust and assists in desulfurizing, and the second stage mainly removes dust and assists in desulfurizing. The flue gas is introduced into the desulfurizing tower by the induced draft fan 71, treated by two stages and discharged by the chimney 8. And the wastewater generated by desulfurization is discharged from the bottom of the desulfurization tower, and is discharged into a ditch by a blow-off pipe after being collected, and is collected into a sedimentation tank for treatment and recycling.

(2) Vapor wood dust removal

The water vapor generated by the drying furnace enters the flue to the chimney 8, and the spiral spray head is arranged in the chimney 8 to spray water to the inside so as to remove wood dust in the water vapor. The process flow diagram is shown in FIG. 2; wherein, the structure schematic diagram of the water vapor discharge pipe is shown in FIG. 4;

a small amount of wood dust is mixed in the water vapor discharge pipe, other pollutants are not contained, the wood dust mixed in the water vapor can be removed by adopting a watering dust removal method, a spiral spray head is arranged in the chimney 8, and the sprayed water is fully contacted with the water vapor to adsorb the wood dust. And the waste water generated by removing the wood dust is discharged from the bottom of the chimney 8, and is discharged into a ditch by a blow-off pipe after being collected, and is collected into a sedimentation tank for treatment and recycling. The layout of the pipeline and the facilities is shown in fig. 3, and the data of the discharge content of the harmful substances is shown in fig. 5 after the experiment comparison.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (7)

1. The utility model provides a desulfurization dust collector suitable for expanded ammonium nitrate explosive wood flour drying process, a serial communication port, including interconnect's one-level desulfurizing tower (1), second grade desulfurizing tower (2), the bottom of second grade desulfurizing tower (2) is equipped with exhaust outlet (3), the top of one-level desulfurizing tower (1) and second grade desulfurizing tower (2) all is equipped with buck water inlet (4), the bottom all is equipped with waste water outlet (5), waste water outlet (5) are connected to waste water calandria (6), exhaust outlet (3) intercommunication to waste gas discharge pipe (7), waste gas discharge pipe (7) are connected to chimney (8), be provided with at least one vapor discharge pipe (9) in chimney (8), vapor discharge pipe (9) slope upwards extends to chimney (8) outside, install at least one spiral water jet (91) in vapor discharge pipe (9) inside top, spiral water jet (91) can spray to the regional inside of vapor discharge pipe (9) and spray, The other end of the water vapor discharge pipe (9) is connected to the drying oven.

2. A desulfurization and dust removal apparatus according to claim 1, wherein the exhaust gas discharge pipe (7) is connected to the chimney (8) through one induced draft fan (71), or two induced draft fans (71) connected in parallel, and the parallel connection is connected by a controllable three-way pipe joint (72).

3. The desulfurization dust removing apparatus as recited in claim 1, wherein the inner wall of said vapor discharge pipe (9) is painted with epoxy paint, and said spiral sprinkler head (91) is installed in said vapor discharge pipe (9) to spray in a transverse direction, and the spraying direction is opposite to the vapor discharge direction.

4. The desulfurization and dust removal device of claim 1, wherein the primary desulfurization tower (1) is a cylindrical tower body, a first main spray pipe (11) longitudinally extends from the top to the middle part in the tower, and a plurality of nozzles (12) with different lengths are arranged at the tail end of the first main spray pipe (11); or

The three nozzles (12) are arranged according to different heights of an upper layer, a middle layer and a lower layer formed by different lengths.

5. The desulfurization and dust removal device as claimed in claim 1, wherein the secondary desulfurization tower (2) is a cylindrical tower body, a waste gas inlet pipe (21) is arranged in the tower longitudinally and downwards, a plurality of gas inlets (23) are formed from the top to the middle of the waste gas inlet pipe (21), a second spraying main pipe (22) is installed in the tower, the second spraying main pipe (22) sprays outwards corresponding to each gas inlet (23), and the bottom of the waste gas inlet pipe (21) is connected to the waste gas discharge pipe (7).

6. The desulfurization and dust removal device of claim 4, wherein the first spraying main pipe (11) is made of stainless steel material, and the spray nozzle (12) is a stainless steel spiral spray head.

7. A desulfurising and dedusting apparatus according to claim 1, wherein the bottom of the chimney (8) is provided with a drain (81), the drain (81) is connected to an externally mounted collection tank (82), the collection tank (82) is connected to a waste drain pipe (6), and the waste drain pipe (6) is finally connected to a sewage treatment system.

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