CN217236368U - Sodium nitrite drying device - Google Patents

Abstract

The utility model discloses a sodium nitrite drying device, including wind chamber, drying chamber, the cover of breathing in that arranges from bottom to top and link together, wind chamber, drying chamber are the cuboid structure, and the cover of breathing in is located the drying chamber top, and the lower part passes through trapezoidal buffer segment and links to each other with the drying chamber, the drying chamber is divided into three-section along length direction level, breaks up section, heating section, cooling zone in proper order, breaks up the section and is the cavity structure, is equipped with in the section of breaking up, installs built-in heat exchanger in the heating section, installs built-in cooler in the cooling section, installs the air distribution plate between drying chamber and the wind chamber; the lower part of the air chamber is provided with an air inlet, the top of the air suction cover is provided with an air outlet, the side part of the air suction cover above the scattering section is provided with a feed inlet, and the lower part of the side of the cooling section is provided with a discharge outlet. The utility model discloses productivity is high, area is little, the energy consumption is low, can be used to industry large-scale production.

Description

Sodium nitrite drying device

Technical Field

The utility model relates to a drying device, in particular to a sodium nitrite drying device.

Background

At present, the domestic drying equipment for producing sodium nitrite basically adopts a single-layer cylindrical fluidized bed or a disc type multi-layer fluidized bed. Because the top of the fluidized bed is provided with a stirring device, the fluidized bed is characterized in that: the low-wind-pressure operation is adopted, the material layer is thin and is only 20-30 cm, the material retention time is short, the hot wind utilization rate is low, and the productivity is low and is only about 3 t/h; the discharged material has high moisture content, the water content is about 2 percent, the packaging difficulty of finished products is increased, no cooling device is used, and the discharged material has high temperature. Because the movable sealing points are multiple, the leakage rate is high, the maintenance cost is high, the bed is easy to die, the leakage is serious, and the field environment is severe.

The sodium nitrite material is characterized in that: large water content, large viscosity and poor fluidity; therefore, the traditional cylindrical fluidized bed is difficult to adapt to the requirements of capacity expansion, energy consumption reduction and continuous and stable production.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art, and providing the ultrahigh material layer sodium nitrite drying device which has high productivity, small occupied area and low energy consumption, can be used for industrial mass production and can continuously and stably operate.

In order to realize the purpose, the utility model discloses an air chamber, drying chamber, the cover of breathing in that arrange and link together from bottom to top, air chamber, drying chamber are the cuboid structure, the cover of breathing in is located the drying chamber top, the lower part passes through trapezoidal buffer segment and links to each other with the drying chamber, its structural feature is that the drying chamber is divided into three-section along length direction level, in proper order for break up section, heating section, cooling section, break up the section and be the cavity structure, be equipped with in the break up section and break up the device, install built-in heat exchanger in the heating section, install built-in cooler in the cooling section, install the air distribution plate between drying chamber and the air chamber; the lower part of the air chamber is provided with an air inlet, the top of the air suction cover is provided with an air outlet, the side part of the air suction cover above the scattering section is provided with a feed inlet, and the lower part of the side of the cooling section is provided with a discharge outlet.

Preferably, the top of the drying chamber is hermetically connected with the bottom of the air suction cover, and the air chamber is internally provided with 2 vertical partition plates which divide the drying chamber into three independent spaces which respectively correspond to the scattering section, the heating section and the cooling section on the upper part of the drying chamber.

Preferably, two groups of built-in heaters are arranged in the heating section, the built-in heaters are arranged side by side along the length direction of the drying chamber, each group of built-in heaters consists of a plurality of layers of horizontal heating pipes, the upper layers and the lower layers of the heating pipes are arranged in a staggered mode, one end of each layer of heating pipe outside the drying chamber is connected with the steam main pipe, and the other end of each layer of heating pipe is connected with the condensate water main pipe.

Preferably, the top of the air suction cover is also provided with a feed back feed opening, the air outlet and the feed back feed opening are provided with a cyclone dust collector, the inlet of the cyclone dust collector is connected with the air outlet, and the feed back outlet of the cyclone dust collector is connected with the feed back feed opening.

Preferably, the feed back blanking port is positioned above the cooling section.

After adopting above-mentioned structure, will break up the section and be the cavity structure, establish the breaking device at the section of breaing up, the sodium nitrite material is through dehydration separation after, moisture content is about 3.5%, if the difference in temperature is too big during the feeding can melt, bond by oneself, cause the jam, owing to break up the section and be the cavity structure, do not establish built-in heating device, prevent that the material difference in temperature is too big to cause and harden. Through adding the scattering device, the material is scattered earlier, predryed and then gets into the heating section and contact with built-in heater, has effectively solved the material and has melted, the problem that the bonding causes the fluidized bed to block up certainly. The utility model adopts high material level and high wind pressure operation, the material layer height is 4 times of that of the domestic existing sodium nitrite fluidized bed, and the water content of the product is reduced to 0.5 percent from the original 2 percent; and automatic packaging of finished materials can be realized. The external heater is arranged to carry out secondary heating on the hot air, and the internal heater directly exchanges heat with the materials, so that the heat efficiency is improved to the maximum extent. After the ultra-high material layer structure and the built-in heater are adopted, the steam consumption is reduced by about 90kg/t compared with the best level in the same industry.

The utility model discloses a drying and cooling integration, each part all is direct continuous, is a quiet equipment, has solved that current sodium nitrite fluidized bed equipment movable seal point is many, and the problem that the leakage rate is high has improved the production environment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic side view of fig. 1.

Detailed Description

Referring to fig. 1 and 2, the sodium nitrite drying device comprises an air chamber 3, a drying chamber 2 and an air suction cover 1 which are arranged from bottom to top and connected together, wherein the air chamber 3 and the drying chamber 2 are in a cuboid structure, the air suction cover 1 is positioned above the drying chamber 2, the transverse (width direction) sectional area of the air suction cover 1 is larger than that of the drying chamber 2 and the air chamber 3, the lower part of the air suction cover is connected with the drying chamber 2 through a trapezoidal buffer section, the top of the drying chamber 2 is hermetically connected with the bottom of the air suction cover 1, and the transverse sectional area of the air suction cover is generally 1.5-3 times, in the embodiment 2 times, of the drying chamber. The drying chamber 2 is horizontally divided into three sections along the length direction, the three sections are a pre-scattering section 4, a heating section 5 and a cooling section 6 in sequence, the scattering section 4 is of a cavity structure and is used as a material blanking area, a built-in heat exchanger 7 is installed in the heating section 5, a built-in cooler 8 is installed in the cooling section 6, and an air distribution plate 9 is installed between the drying chamber 2 and an air chamber 3 below the drying chamber. The lower part of the air chamber 3 is provided with an air inlet which is respectively a first air inlet 10, a second air inlet 11, a third air inlet 12 and a fourth air inlet 13, the top of the air suction cover 1 is provided with an air outlet 14, the lateral part of the air suction cover 1 above the scattering section 4 is provided with a feed inlet 15, the air suction cover 1 above the scattering section 4 is provided with a scattering device 17 extending into the inner cavity of the scattering section 4, the scattering device 17 is close to the feed inlet 15, the scattering device 17 comprises a motor and a speed reducer which are positioned at the outer side of the top of the scattering section 4, and a connecting rod and a blade which extend into the inner cavity of the scattering section 4, and the structure of the scattering device is a known structure. The lower part of the end surface of the cooling section 6 is provided with a discharge hole 16. In this embodiment, the drying chamber 2 has a total length of 6450mm, a width of 1500mm and a height of 1350 mm; the total height of the sodium nitrite drying device is 5150mm, the length of the heating section 5 is 2500mm, and the length of the cooling section 6 is 2500 mm.

In this embodiment, set gradually along length direction in drying chamber 2 and break up section 4, heating section 5, cooling section 6, do not establish independent space, for whole through structure, do not establish built-in heating device in breaking up section 4, prevent that the material difference in temperature is too big to cause and harden. The working height of the material is controlled to be 800-1000 mm by adjusting the air pressure and the air quantity; 2 vertical baffles 19 are arranged in the air chamber 3 and are separated into three independent spaces, the independent spaces are respectively corresponding to the scattering section 4 on the upper portion of the air chamber, the heating section 5 and the cooling section 6, an air outlet 14 is formed in the top of the air suction cover 1, a feed back feed opening 18 for a cyclone dust collector is further arranged on the upper portion of the air suction cover 1, the feed back feed opening 18 is located above the cooling section 6, a cyclone dust collector is arranged on the air outlet 14 and the feed back feed opening 18, the inlet of the cyclone dust collector is connected with the air outlet 14, the feed back outlet of the cyclone dust collector is connected with the feed back feed opening 18, the feed back of the cyclone dust collector returns to the fluidized bed cooling section, and cooling of high-temperature materials after cyclone separation can be achieved. Two groups of built-in heaters 7 are arranged in the heating section 5, a single row of horizontal pipes are arranged, the built-in heaters 7 are arranged side by side along the length direction of the drying chamber 2, each group consists of a plurality of layers of horizontal heating pipes, 12 layers are arranged in the embodiment, the upper horizontal pipe and the lower horizontal pipe are arranged in a staggered manner in the middle, one end of each layer of horizontal pipe outside the drying chamber 2 is connected with a steam main pipe, and the other end of each layer of horizontal pipe is connected with a condensate water main pipe; the built-in cooler 8 takes a similar structure to the built-in heater 7; the built-in cooler 8 and the built-in heater 7 are detachably mounted for convenient mounting and maintenance.

The internal heaters 7 are arranged side by side, 2 groups of the internal heaters are the same in size, each group of the internal heaters is 715mm wide, 1100 mm long and 1450mm high, each group of horizontal heating pipes are arranged in a snake shape, the horizontal distance is 50mm, the distance between the heating pipes of the internal heaters 7 can be adjusted according to the particle sizes or sizes of different materials, and the distance adopted in the embodiment is suitable for drying the sodium nitrite.

And air inlets are formed in the lower part of the air chamber 3, wherein a first air inlet 10 corresponds to the scattering section 4, a second air inlet 11 corresponds to 2 groups of built-in heaters in the heating section 5, namely 1 air inlet is correspondingly formed in 2 groups of built-in heaters, and a third air inlet 12 and a fourth air inlet 13 correspond to the cooling section 6. The air distribution plate 9 adopts a layering interface to discharge air from the side, and the aperture ratio is 3-4.5%.

The utility model discloses the during operation, send into water content 3.5%, temperature 45 ℃'s sodium nitrite through vibrating feeder feed inlet 15, the material is advanced and is broken up section 4, the warp is broken up device 17 and is broken up, the temperature 110 ℃ with lower part plenum 3 sends into, the hot-air heat transfer of pressure 5.2Kpa (gauge pressure), deviate from partial free water, reentrant drying section 5, the temperature 165 ℃ with lower part plenum 3 sends into, the hot-blast and the built-in heater 7 heat transfer of pressure 5.2Kpa (gauge pressure), behind the desorption free moisture, get into the temperature 30 ℃ that cooling zone 6 and lower part plenum 3 sent into, pressure 5.2Kpa (gauge pressure) cold air and the heat transfer of built-in circulation water cooler 8, the material falls to about 50 ℃, 16 ejection of compact through the discharge gate. And tail gas at the temperature of about 90 ℃ is discharged from the air outlet 14 and enters the cyclone separator, separated materials enter the cooling section 6 through the feed back feed opening 18, and the dried tail gas is discharged after being qualified. When the sodium nitrite drying device is used for drying sodium nitrite, the production capacity can reach 10 tons/hour in terms of finished products.

Claims (5)

1. A sodium nitrite drying device comprises an air chamber, a drying chamber and an air suction cover which are arranged from bottom to top and connected together, wherein the air chamber and the drying chamber are of a cuboid structure, the air suction cover is positioned above the drying chamber, and the lower part of the air suction cover is connected with the drying chamber through a trapezoidal buffer section; an air inlet is formed in the lower portion of the air chamber, an air outlet is formed in the top of the air suction cover, a feeding hole is formed in the side portion, above the scattering section, of the air suction cover, and a discharging hole is formed in the lower portion of the cooling section.

2. The sodium nitrite drying device as set forth in claim 1, wherein the top of the drying chamber is hermetically connected with the bottom of the suction hood, and the air chamber is divided into three independent spaces by 2 vertical partitions, which correspond to the scattering section, the heating section and the cooling section of the upper portion of the air chamber.

3. The sodium nitrite drying device according to claim 1 or 2, wherein two groups of built-in heaters are arranged in the heating section, the built-in heaters are arranged side by side along the length direction of the drying chamber, each group of built-in heaters comprises a plurality of layers of horizontal heating pipes, the upper layers and the lower layers of the heating pipes are staggered, and each layer of heating pipes is connected with a steam main pipe at one end outside the drying chamber, and the other end of each layer of heating pipes is connected with a condensate water main pipe.

4. The sodium nitrite drying device as set forth in claim 3, wherein a feed back feed opening is further provided at the top of the suction hood, a cyclone is provided on the air outlet and the feed back feed opening, an inlet of the cyclone is connected to the air outlet, and a feed back outlet of the cyclone is connected to the feed back feed opening.

5. The sodium nitrite drying device as set forth in claim 4, wherein the feed-back feed opening is located at a position above the cooling section.

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