Novel carrier gas circulation dehumidifying and drying process system

Abstract

The invention discloses a novel carrier gas circulation dehumidification drying process system which comprises a carrier gas heater, a drying machine, a cyclone dust collector, a bag-type dust collector, a film dehumidifier, an adsorption dehumidifier and a regeneration heater, and the carrier gas heater is communicated with the drying machine; the top of the drying machine is sequentially connected with the cyclone dust collector and the bag-type dust collector; the bag-type dust collector is connected with the membrane dehumidifier; the membrane dehumidifier is connected with the adsorption dehumidifier; and the adsorption dehumidifier is connected with the regeneration heater. According to the novel carrier gas circulation dehumidification drying process system, the membrane dehumidifier and the adsorption dehumidifier are combined to remove humidity in circulation carrier gas, cooling is not needed in the dehumidification process, the energy utilization rate of the circulation carrier gas is increased to 85% or above, meanwhile, waste gas emission is reduced to 15% or below, more energy is saved, low carbon is achieved, and environment friendliness is achieved. The method can be widely applied to the carrier gas circulation drying field.

Description

Technical Field

[0001] The invention relates to the field of novel carrier gas circulation drying, and in particular to a novel carrier gas circulation dehumidification and drying process system. Background Art

[0002] Drying operations are widely used in chemical, food, light industry, textile, coal, agricultural and forestry product processing and building materials sectors. The drying process produces a large amount of low-temperature tail gas, and the direct emission of this part of the tail gas leads to 30-45% heat loss. Therefore, the development of a new carrier gas circulation dehumidification drying process system is of great significance to the innovation and progress of drying technology. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of carrier gas circulation dehumidification and drying process system which is more energy-saving and efficient.

[0004] To achieve the above-mentioned purpose, the novel carrier gas circulation dehumidification and drying process system of the present invention includes: a carrier gas heater, a dryer, a cyclone dust collector, a bag dust collector, a membrane dehumidifier, an adsorption dehumidifier and a regeneration heater, wherein the carrier gas heater is connected to the dryer; the top of the dryer is connected to the cyclone dust collector and the bag dust collector in sequence; the bag dust collector is connected to the membrane dehumidifier; the membrane dehumidifier is connected to the adsorption dehumidifier; the adsorption dehumidifier is connected to the regeneration heater.

[0005] In one embodiment, the gas outlet of the adsorption dehumidifier is also connected to the gas inlet of the carrier gas heater.

[0006] In one embodiment, the dryer is also connected to a feed screw conveyor, and the wet material is transported to the dryer through the feed screw conveyor; the dryer is a fluidized bed dryer, a drum dryer, a flash dryer, an air tube dryer or a paddle dryer; the discharge port of the dryer is also provided with a discharge valve.

[0007] In one embodiment, the gas inlet of the carrier gas heater is connected to a filter and a blower; the carrier gas heater and / or the regeneration heater is a steam type heater or an electric heater, and the steam type heater is provided with a steam inlet and a steam condensate outlet.

[0008] In one embodiment, a cyclone rotary valve is provided at the bottom of the cyclone dust collector.

[0009] In one embodiment, a bag rotary valve is provided at the bottom of the bag filter.

[0010] In one embodiment, an induced draft fan is provided between the bag filter and the membrane dehumidifier; and a regeneration fan is provided between the adsorption dehumidifier and the regeneration heater.

[0011] In one embodiment, the membrane dehumidifier is a ceramic membrane module or a hollow fiber membrane module.

[0012] In one embodiment, the number of the adsorption dehumidifiers is two and they are operated in parallel.

[0013] In one embodiment, the adsorption dehumidifier is filled with a water absorbent, and the water absorbent is zeolite or porous aluminum phosphate material.

[0014] The present invention has at least the following advantages:

[0015] 1. The novel carrier gas circulation dehumidification and drying process system of the present invention efficiently dehumidifies and utilizes tail gas, which is more energy-saving. In the present invention, a membrane dehumidifier and an adsorption dehumidifier are combined to remove water vapor in the circulating carrier gas without reducing the temperature of the circulating carrier gas. The energy utilization rate of the circulating carrier gas is increased to more than 85%, which is more energy-saving.

[0016] 2. The novel carrier gas circulation dehumidification and drying process system of the present invention is anhydrous circulation dehumidification, which is more low-carbon and environmentally friendly. In the present invention, the dehumidification process does not require cooling and cooling, and does not require the addition of excess washing water, which saves a lot of cold energy and realizes anhydrous dehumidification. At the same time, the exhaust gas emission is reduced to less than 15%, which is more low-carbon and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of an embodiment of the novel carrier gas circulation dehumidification and drying process system of the present invention.

[0019] Wherein, the reference numerals are:

[0020] 1-filter, 2-blower, 3-carrier gas heater, 4-feed screw conveyor, 5-dryer, 6-discharge valve, 7-cyclone dust collector, 8-cyclone rotary valve, 9-bag dust collector, 10-bag rotary valve, 11-induced draft fan, 12-membrane dehumidifier, 13-adsorption dehumidifier, 14-regeneration fan, 15-regeneration heater. DETAILED DESCRIPTION

[0021] like Figure 1 , which is a schematic diagram of an embodiment of a novel carrier gas circulation dehumidification and drying process system of the present invention. The novel carrier gas circulation dehumidification and drying process system of the present invention comprises a filter 1, a blower 2, a carrier gas heater 3, a feed screw conveyor 4, a dryer 5, a discharge valve 6, a cyclone dust collector 7, a cyclone rotary valve 8, a bag dust collector 9, a bag rotary valve 10, an induced draft fan 11, a membrane dehumidifier 12, an adsorption dehumidifier 13, a regeneration fan 14 and a regeneration heater 15.

[0022] The filter 1 is connected to the blower 2, and the blower 2 is connected to the gas inlet of the carrier gas heater 3. The carrier gas (such as external air) is filtered by the filter 1 and pressurized by the blower 2 before being input into the carrier gas heater 3. The carrier gas heater 3 is a steam type heater or an electric type heater, and the steam type heater is provided with a steam inlet and a steam condensate outlet.

[0023] The carrier gas heater 3 is connected to the dryer 5. The dryer 5 is connected to the feed screw conveyor 4, and the wet material is transported to the dryer 5 through the feed screw conveyor 4. The discharge port of the dryer 5 is provided with a discharge valve 6. The dryer 5 is a fluidized bed dryer, a drum dryer, a flash dryer, an air flow tube dryer or a paddle dryer. After being heated by the carrier gas heater 3, the carrier gas enters the dryer 5 and is mixed and dried with the wet material transported by the feed screw conveyor 4, and the dried material is discharged from the discharge valve 6.

[0024] The top of the dryer 5 is connected to a cyclone dust collector 7, and the cyclone dust collector 7 is connected to a bag dust collector 9. A cyclone rotary valve 8 is provided at the bottom of the cyclone dust collector 7. A bag dust collector rotary valve 10 is provided at the bottom of the bag dust collector 9. The wet exhaust gas discharged from the dryer 5 is removed by the cyclone dust collector 7 and the bag dust collector 9 in sequence.

[0025] The bag filter 9 is connected to the induced draft fan 11, and the induced draft fan 11 is connected to the membrane dehumidifier 12. The membrane dehumidifier 12 is connected to the adsorption dehumidifier 13. The membrane dehumidifier 12 is a ceramic membrane module or a hollow fiber membrane module. The adsorption dehumidifier 13 is filled with a water absorbent, which is a zeolite or a porous aluminum phosphate material. The exhaust gas after dust removal is pressurized by the induced draft fan 11 and passes through the membrane dehumidifier 12 and the adsorption dehumidifier 13 for dehumidification.

[0026] The gas outlet of the adsorption dehumidifier 13 is also connected to the gas inlet of the carrier gas heater 3. The dehumidified tail gas returns to the carrier gas heater 3 and is circulated and used as the carrier gas.

[0027] The adsorption dehumidifier 13 is connected to the regeneration heater 15 and the regeneration fan 14 in sequence. Two adsorption dehumidifiers 13 are operated in parallel, one for use and one for regeneration standby. The regeneration process uses the regeneration fan 14 to increase pressure and the regeneration heater 15 to heat the regeneration gas to regenerate the water absorbent.

[0028] The regeneration heater 15 is a steam type heater or an electric type heater. The steam type heater is provided with a steam inlet and a steam condensate outlet.

[0029] The carrier gas (such as outside air) is pressurized by the filter 1 and the blower 2, and then heated by the carrier gas heater 3 before entering the dryer 5 for mixed drying. The dried material is discharged from the discharge valve 6; the wet exhaust gas discharged from the dryer 5 is successively dedusted by the cyclone dust collector 7 and the bag dust collector 9, and the exhaust gas after dedusting is pressurized by the induced draft fan 11. Most of the circulating gas is dehumidified by the membrane dehumidifier 12 and the adsorption dehumidifier 13 in turn, and then returns to the inlet of the blower 2, and the excess exhaust gas is directly discharged from the outlet of the induced draft fan 11; the adsorption dehumidifier 13 is operated in parallel with two units, one in use and the other in regeneration standby. The regeneration process uses the regeneration fan 14 to pressurize and the regeneration heater 15 to heat the regeneration gas to regenerate the water absorbent.

[0030] The novel carrier gas circulation dehumidification and drying process system of the present invention removes the humidity in the circulating carrier gas by combining a membrane dehumidifier and an adsorption dehumidifier. The dehumidification process does not require cooling and the energy utilization rate of the circulating carrier gas is increased to more than 85%, while the exhaust gas emission is reduced to less than 15%, which is more energy-saving, low-carbon and environmentally friendly. The present invention can be widely used in the field of carrier gas circulation drying.

[0031] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A new type of carrier gas circulation dehumidification and drying process system, characterized in that: include: A carrier gas heater (3), a dryer (5), a cyclone dust collector (7), a bag dust collector (9), a membrane dehumidifier (12), an adsorption dehumidifier (13) and a regeneration heater (15), wherein the carrier gas heater (3) is connected to the dryer (5); the top of the dryer (5) is connected to the cyclone dust collector (7) and the bag dust collector (9) in sequence; the bag dust collector (9) is connected to the membrane dehumidifier (12); the membrane dehumidifier (12) is connected to the adsorption dehumidifier (13); and the adsorption dehumidifier (13) is connected to the regeneration heater (15).

2. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The gas outlet of the adsorption dehumidifier (13) is also connected to the gas inlet of the carrier gas heater (3).

3. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The dryer (5) is also connected to a feed screw conveyor (4), and the wet material is conveyed to the dryer (5) through the feed screw conveyor (4); the dryer (5) is a fluidized bed dryer, a drum dryer, a flash dryer, an air tube dryer or a paddle dryer; the discharge port of the dryer (5) is also provided with a discharge valve (6).

4. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The gas inlet of the carrier gas heater (3) is connected to a filter (1) and a blower (2); the carrier gas heater (3) and / or the regeneration heater (15) is a steam type heater or an electric heater, and the steam type heater is provided with a steam inlet and a steam condensate outlet.

5. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: A cyclone rotary valve (8) is provided at the bottom of the cyclone dust collector (7).

6. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: A bag rotary valve (10) is provided at the bottom of the bag dust collector (9).

7. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: An induced draft fan (11) is provided between the bag filter (9) and the membrane dehumidifier (12); and a regeneration fan (14) is provided between the adsorption dehumidifier (13) and the regeneration heater (15).

8. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The membrane dehumidifier (12) is a ceramic membrane module or a hollow fiber membrane module.

9. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The number of the adsorption dehumidifiers (13) is two and they are operated in parallel.

10. The novel carrier gas circulation dehumidification and drying process system according to claim 1 is characterized in that: The adsorption dehumidifier (13) is filled with a water absorbent, which is zeolite or porous aluminum phosphate material.

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