CN206256012U - The melamine preparation device of coproduction nitro-compound fertilizer - Google Patents

Abstract

The utility model is related to a kind of melamine preparation device, and in particular to a kind of melamine preparation device of coproduction nitro-compound fertilizer.Described device, including urea melting tank, urea melting tank washes tower by pipeline and urine, fluidized-bed reactor, hot gas cooler, initial separator, hot-air filter, crystallizer, trap and solid triamine finished product bin are sequentially connected, liquid area tank is also associated with the pipeline that urea melting tank and urine are washed between tower, urine washes tower by pipeline and carrier gas fog separator, Carrier Gas Compressor is sequentially connected, Carrier Gas Compressor is connected on the pipeline that urine is washed between tower and fluidized-bed reactor, urine wash tower also with cold wind blower fan, trap is sequentially connected, cold air demister is connected with the pipeline that urine is washed between tower and carrier gas fog separator, cold air demister by pipeline respectively with crystallizer, nitro-compound fertilizer process units is connected.The utility model apparatus structure is simple, easy to operate, facility compact, energy consumption are low.

Description

The melamine preparation device of coproduction nitro-compound fertilizer

Technical field

The utility model is related to a kind of melamine preparation device, and in particular to a kind of melamine of coproduction nitro-compound fertilizer Amine process units.

Background technology

The production of the existing melamine of China all uses urea method, China urea method Melamine Production Technology 1969 Start from Tianjin Tianjin chemical plant, 300 tons/year of first set plant capacity, using liquid phase quenching technique.Because equipment corrosion is tight Weight, the utilization of capacity is relatively low, several improved, has gradually formed most the dry of medium-sized and small enterprises application at present and has caught reprocessing process, be i.e. tradition Low-pressure process technique.The method technical process is：Raw material urea is directly added into reactor in granular form, and reactor is ebullated bed, Pressure is higher than normal pressure, 390 ± 5 DEG C of temperature, and catalyst is silica gel, and using ammonia recycle as carrier gas, reaction institute calorific requirement is by fused salt System is provided.After reactant is separated with the reacted device inner top cyclone separator of gas phase, hot-air filter is gone to trap impurity, Material separates out melamine crystallization through dry collection device by Temperature fall after filtering, and highly finished product are refined using recrystallization method, Obtain melamine product.

During completing melamine reaction as raw material with urea, ton product is while by-product 1300Nm³The NH of left and right₃With 600Nm³The CO of left and right₂The reaction end gas of composition, resource and coproduction condition according to each producer, tail gas is used to separate system The products such as standby liquefied ammonia, i.e., so-called " ammonia, carbon are separated ", or production ammoniacal liquor, ammonium hydrogen carbonate, ammonium nitrate, urea.Melamine tail gas Using the on-road efficiency for directly affecting melamine plant.How to be effectively the technology that needs are solved using melamine tail gas Problem.

Utility model content

According to deficiency of the prior art above, the technical problems to be solved in the utility model is：A kind of structure letter is provided The melamine preparation device of the low coproduction nitro-compound fertilizer of single, easy to operate, facility compact, energy consumption.

The utility model solves the technical scheme that its technical problem used：

The melamine preparation device of described coproduction nitro-compound fertilizer, including urea melting tank, urea melting tank pass through Pipeline is washed tower, fluidized-bed reactor, hot gas cooler, initial separator, hot-air filter, crystallizer, trap and is consolidated with urine Body triamine finished product bin is sequentially connected, and liquid area tank is also associated with the pipeline that urea melting tank and urine are washed between tower, and urine is washed Tower is sequentially connected by pipeline with carrier gas fog separator, Carrier Gas Compressor, and Carrier Gas Compressor is connected to urine and washes tower and fluid bed On pipeline between reactor, urine is washed tower and is also sequentially connected with cold wind blower fan, trap, urine wash tower and carrier gas fog separator it Between pipeline on be connected with cold air demister, cold air demister by pipeline respectively with crystallizer, nitro-compound fertilizer process units It is connected.

Described nitro-compound fertilizer process units include be sequentially connected averager, evaporator, one-level mixing channel, two grades mix Groove, granulation tower, powder flow cooler, pack roller, nitro-compound fertilizer finished product bin are closed, wherein, one-level mixing channel external connection There are the first cast feeder, two grades of mixing channels to be externally connected to the second cast feeder.

Operation principle and process：

With solid urea and/or urea plant coproduction liquid area as raw material, during work, solid urea is in urea melting tank Middle heating is melt into liquid and washes tower into urine, and liquid area is directly entered urine and washes tower by liquid area tank, and laggard fluidized bed is anti- Catalytic action of the device by catalyst is answered, at 390-400 DEG C, urea is converted into melamine under 0.40-0.80MPa (absolute pressure) Amine, while generating ammonia and carbon dioxide, enters hot gas cooler, through primary separation from fluidized-bed reactor material gas out The process gas containing melamine after device, hot-air filter filtering enter crystallizer, it is crystallized after melamine enter trapping Device, the solid triamine isolated send solid triamine finished product bin to pack.Tower is washed by liquid into urine from trap tail gas out Urea is fully washed, and removes the triamine dust in tail gas, three tunnels of tail gas point after purification：A part is as carrier gas through carrier gas demisting point After device, Carrier Gas Compressor, into fluidized-bed reactor；After another part is through cold air demister, the device that decrystallizes all the way is used as knot Crystalline substance cold air, another road enters nitro-compound fertilizer process units, successively neutralized device, three sections of evaporation and concentratings of evaporator, and one-level is mixed Close groove to mix with phosphorus ammonium, two grades of mixing channels mix with potassium sulfate and inserts, and liquid is sprayed to granulation tower through comminutor after mixing Granulation, after balling-up after powder flow cooler further cooling, gone after the treatment of particle wrapped roller coating nitro-compound fertilizer into Product feed bin is packed.

The beneficial effects of the utility model are：

1st, the utility model is by rationally design, there is provided a kind of melamine preparation device of coproduction nitro-compound fertilizer, Using this device using the nitro-compound fertilizer of triamine End gas production high added value, triamine vent gas treatment problem is not only solved, reduced Nitro-compound fertilizer production cost, also with simple structure, easy to operate, facility compact, energy consumption it is low, it is cost-effective the characteristics of.

2nd, described fluidized-bed reactor pressure is 0.40-0.80MPa, under the pressure condition, Carrier Gas Compressor power consumption drop Low by more than 50%, catalyst efficiency obtains larger raising, is more suitable for the maximization of device, and the tail gas for exporting at this pressure need not Pressurization or step-down can be fed directly to nitro-compound fertilizer process units.

Brief description of the drawings

Fig. 1 is the utility model structural representation；

In figure：1st, urea melting tank；2nd, liquid area tank；3rd, urine washes tower；4th, fluidized-bed reactor；5th, hot gas cooler； 6th, initial separator；7th, hot-air filter；8th, crystallizer；9th, trap；10th, solid triamine finished product bin；11st, cold wind blower fan； 12nd, carrier gas fog separator；13rd, Carrier Gas Compressor；14th, cold air demister；15th, averager；16th, evaporator；17th, one-level mixing Groove；18th, the first cast feeder；19th, two grades of mixing channels；20th, the second cast feeder；21st, granulation tower；22nd, powder flow cooler；23rd, wrap Wrap up in roller；24th, nitro-compound fertilizer finished product bin.

Specific embodiment

Embodiment of the present utility model is described further below in conjunction with the accompanying drawings：

As shown in figure 1, the melamine preparation device of described coproduction nitro-compound fertilizer, including urea melting tank 1, urea Melting tank 1 washes tower 3, fluidized-bed reactor 4, hot gas cooler 5, initial separator 6, hot-air filter 7, knot by pipeline and urine Brilliant device 8, trap 9 and solid triamine finished product bin 10 are sequentially connected, on the pipeline that urea melting tank 1 and urine are washed between tower 3 also Liquid area tank 2 is connected with, urine is washed tower 3 and is sequentially connected with carrier gas fog separator 12, Carrier Gas Compressor 13 by pipeline, carrier gas Compressor 13 is connected on the pipeline washed between tower 3 and fluidized-bed reactor 4 of urine, urine wash tower 3 also with cold wind blower fan 11, trap 9 are sequentially connected, and cold air demister 14, cold air demister are connected with the pipeline that urine is washed between tower 3 and carrier gas fog separator 12 14 are connected with crystallizer 8, nitro-compound fertilizer process units respectively by pipeline.

Described nitro-compound fertilizer process units include be sequentially connected averager 15, evaporator 16, one-level mixing channel 17, Two grades of mixing channels 19, granulation tower 21, powder flow cooler 22, pack roller 23, nitro-compound fertilizer finished product bins 24, wherein, one Level mixing channel 17 is externally connected to 18, two grades of mixing channels 19 of the first cast feeder and is externally connected to the second cast feeder 20.

With solid urea and/or urea plant coproduction liquid area as raw material, during work, solid urea is in urea melting tank Heating is melt into liquid and washes tower 3 into urine in 1, and liquid area is directly entered urine and washes tower 3 by liquid area tank 2, and fluidisation is entered afterwards The catalytic action that bed reactor 4 passes through catalyst, at 390-400 DEG C, urea is converted under 0.40-0.80MPa (absolute pressure) Melamine, while generating ammonia and carbon dioxide, enters hot gas cooler 5, through first from the material gas out of fluidized-bed reactor 4 Level separator 6, hot-air filter 7 filter after the process gas containing melamine enter crystallizer 8, it is crystallized after melamine Into trap 9, the solid triamine isolated send solid triamine finished product bin 10 to pack.Enter from the tail gas out of trap 9 Urine is washed tower 3 and is fully washed by liquid area, removes the triamine dust in tail gas, three tunnels of tail gas point after purification：A part is used as load After gas is through carrier gas fog separator 12, Carrier Gas Compressor 13, into fluidized-bed reactor 4；Another part is through cold air demister 14 Afterwards, device 8 is decrystallized all the way as crystallization cold air, another road enters nitro-compound fertilizer process units, successively neutralized device 15, steaming Hair 16 3 sections of evaporation and concentratings of device, one-level mixing channel 17 mixes with phosphorus ammonium, and two grades of mixing channels 19 mix with potassium sulfate and inserts, mixes Liquid is sprayed to granulation tower 21 and granulates through comminutor after conjunction, after balling-up after powder flow cooler 22 further cooling, particle warp Nitro-compound fertilizer finished product bin 24 is gone to pack after the treatment of the coating of pack roller 23.

Claims (2)

1. a kind of melamine preparation device of coproduction nitro-compound fertilizer, including urea melting tank (1), it is characterised in that：Urea Melting tank (1) washes tower (3), fluidized-bed reactor (4), hot gas cooler (5), initial separator (6), hot gas by pipeline and urine Filter (7), crystallizer (8), trap (9) and solid triamine finished product bin (10) are sequentially connected, urea melting tank (1) with urine Liquid area tank (2) is also associated with the pipeline washed between tower (3), urine washes tower (3) by pipeline and carrier gas fog separator (12), Carrier Gas Compressor (13) is sequentially connected, Carrier Gas Compressor (13) be connected to urine wash tower (3) and fluidized-bed reactor (4) it Between pipeline on, urine is washed tower (3) and is also sequentially connected with cold wind blower fan (11), trap (9), and urine washes tower (3) with carrier gas demisting point Be connected with cold air demister (14) on pipeline between device (12), cold air demister (14) by pipeline respectively with crystallizer (8), nitro-compound fertilizer process units is connected.

2. the melamine preparation device of coproduction nitro-compound fertilizer according to claim 1, it is characterised in that：Described nitre Base composite fertilizer process units includes the averager (15), evaporator (16), one-level mixing channel (17), the two grades of mixing channels that are sequentially connected (19), granulation tower (21), powder flow cooler (22), pack roller (23), nitro-compound fertilizer finished product bin (24), wherein, one Level mixing channel (17) is externally connected to the first cast feeder (18), two grades of mixing channels (19) and is externally connected to the second cast feeder (20).