CN209490495U

CN209490495U - Ammonium phosphate system low temperature exhaust heat comprehensive utilization device

Info

Publication number: CN209490495U
Application number: CN201822072871.0U
Authority: CN
Inventors: 赵秀凤; 祁健; 许如海
Original assignee: NANJING QIUSHI CHEMICAL ENGINEERING Co Ltd; JIANGSU KESHENG CHEMICAL MACHINERY CO Ltd
Current assignee: NANJING QIUSHI CHEMICAL ENGINEERING Co Ltd; JIANGSU KESHENG CHEMICAL MACHINERY CO Ltd
Priority date: 2018-12-11
Filing date: 2018-12-11
Publication date: 2019-10-15
Anticipated expiration: 2028-12-11

Abstract

The utility model discloses ammonium phosphate system low temperature exhaust heat comprehensive utilization devices, enter the shell side of air heater from the air intlet (8) of the cylinder (16) of air heater (3), pipe (10) interior secondary steam for preheating is preheated in preheating section, slurry after air after preheating is heated the heating of the primary steam in pipe (12) from the shell side that the shell side of preheating section enters bringing-up section, after removing to be further dried multiple-effect evaporation by hot air outlet (13).The utility model reduces the consumption of primary steam by secondary steam for preheating surrounding air, completes the comprehensive utilization of ammonium phosphate system waste heat, reduces the energy consumption and production cost of production of ammonium phosphate.

Description

Ammonium phosphate system low temperature exhaust heat comprehensive utilization device

Technical field

The utility model relates to the method and devices that chemical fertilizer industry residual heat integrative utilizes, and are particularly suitable for phosphorus ammonium system System low temperature exhaust heat comprehensive utilization device.

Background technique

Compound fertilizer's production of ammonium phosphate process uses drying process below at present: first removing phosphorus ammonium material with the method for multiple-effect evaporation A large amount of free water in slurry, wherein the low-pressure saturated steam temperature that two effects are evaporated generally is referred to as in 80 DEG C or so, industry For secondary steam.It is usually dry with 125 DEG C or so of hot-air in order to further decrease the water content after two effects are evaporated in slurry Slurry after two effect evaporations, so that obtained compound fertilizer's water content complies with the national standard requirements.

In traditional handicraft, 80 DEG C of secondary steam obtained in Multi-effect Evaporation Processes is condensed into liquid water by recirculated cooling water It is recycled, a large amount of recirculated water is consumed in condensation process, and a large amount of latent heat of vaporization is wasted.Dry double evaporation-cooling simultaneously Hot-air used in slurry afterwards needs saturated vapor (being referred to as primary steam in industry) heating environment temperature using 180 DEG C Under air obtain, the air at a temperature of heating environment needs to consume a large amount of primary steam.

Traditional phosphorus ammonium drying process can be seen that the latent heat contained by secondary steam and not be applied not only, it is also necessary to A large amount of cooling water is recycled to be condensed.Hot-air needed for the slurry of multiple-effect evaporation is further dried is heated by primary steam. The discharge temperature of secondary steam is at 80 DEG C or more, and compared with common atmospheric temperature (average at 15 DEG C or so), there are also one Fixed sensible heat and latent heat (condensation heat of vapor) can use.Dry hot-air used adds from (15 DEG C or so) of environment temperature To 125 DEG C, 15 DEG C of surrounding air can first be preheating to certain temperature using secondary steam and be added again by primary steam heat Heat can save a large amount of primary steam.

By taking 200,000 tons/year of ammonium phosphate systems as an example, 30 ton/hours of secondary steam is about generated, needs to consume 1200 cubes M/h industrial circulating water, by 15 DEG C or so of surrounding air be heated to 125 DEG C of needs consumption about 15 tons of primary steam/ Hour.

We study traditional phosphorus ammonium drying process discovery, on the one hand a large amount of secondary steam circulating cooling containing latent heat Water condensation, on the other hand desiccant hot-air consumes a large amount of primary steams, if it is possible to the latent heat of secondary steam is made full use of, To reduce the consumption of primary steam, with the raising of energy conservation and reduction production cost requirement, the energy synthesis benefit of secondary steam With being of great significance, have great importance for the energy-saving and emission-reduction of phosphorus ammonium industry.

Summary of the invention

The purpose of this utility model is that: a kind of ammonium phosphate system low temperature exhaust heat comprehensive utilization device is provided, device is simple, at This is cheap, and recycling secondary steam directly condenses a large amount of latent heat taken away, and improves total energy approach efficiency, reduces production of ammonium phosphate energy Consumption and cost.

The technical solution of the utility model is that the phosphorus ammonium residual-heat utilization method is: surrounding air is from air heater Preheating section enters the shell side of heater, is preheated in section tube side and enters heater after the secondary steam for preheating from multi-effect evaporator Bringing-up section, the primary steam that is heated in section tube side of air after preheating in bringing-up section is heated to required process warm Degree, the slurry obtained for drying multiple-effect evaporation.

The phosphorus ammonium residual heat using device includes air heater, air heater by both ends setting ambient air inlet and The cylinder of hot air outlet constitutes the ontology of air heater；It is divided into preheating section and bringing-up section in cylinder；It is arranged in preheating section A certain number of economizer banks walk secondary steam in economizer bank；A certain number of heating tubes are set in bringing-up section, are walked in heating tube Primary steam.

The utility model has the advantages that: air is heated using secondary steam for preheating, has recycled the waste heat of secondary steam, simultaneously The consumption for reducing primary steam, the residual heat integrative for realizing ammonium phosphate system utilize, and reduce the energy consumption and production of production of ammonium phosphate Cost.

Detailed description of the invention

Fig. 1 is the ammonium phosphate system residual heat using device flow diagram of the utility model.

Fig. 2 is the structural schematic diagram of the ammonium phosphate system UTILIZATION OF VESIDUAL HEAT IN air heater of the utility model.

In figure: 1 surrounding air pipe, 2 secondary steam pipes, 3 air heaters, 4 primary steam pipes, 5 warm-air pipes, 6 Primary steam condensate pipe, 7 secondary steam condensate pipes, 8 ambient air inlets, 9 secondary steam imports, 10 economizer banks, 11 primary steam imports, 12 heating tubes, 13 hot air outlets, 14 primary steam condensation-water drains, the condensation of 15 secondary steams Water out, 16 cylinders.

Specific embodiment

It should be understood that following embodiment is solely for the purpose of illustration, rather than protection scope is limited in any way.In order to Narration is easy, and it is attached that valve conventional on pipeline, nozzle, manhole, instrumentation tap, support conventional in equipment etc. are omitted in explanation The those skilled in the art of part, the industry can be designed as needed.The those of ordinary skill of the industry can make many changes Type and improvement, such as change material mode of movement, increase the quantity of heat exchanger or deduster, all these modifications adjust, change Into being regarded as the protection scope of the utility model.

As shown in Figure 1, realizing the UTILIZATION OF VESIDUAL HEAT IN of the ammonium phosphate system by the following method: surrounding air is by surrounding air pipe 1 Into the shell side of air heater 3, the secondary steam for preheating come in the preheating section of air heater 3 by secondary steam pipe 2 The bringing-up section for entering air heater 3 afterwards, the air after preheating in bringing-up section are heated by the primary steam of primary steam pipe 4 Subsequent workshop section is gone by warm-air pipe 5 as hot-air, be condensed into after primary steam heating preheated air primary steam condensed water by Primary steam condensate pipe 6 flows out, and is condensed into secondary steam condensed water by secondary steam after secondary steam for preheating surrounding air Condensate pipe 7 flows out.

As shown in Fig. 2, the phosphorus ammonium residual heat using device includes air heater 3, air heater 3 is by being arranged ring at both ends The cylinder 16 of border air intlet 8 and hot air outlet 13 constitutes the ontology of air heater, and preheating section is divided into cylinder 16 and is added Hot arc；A certain number of economizer banks 10 are set in preheating section, secondary steam is walked in economizer bank, one end of economizer bank 10 is secondary Steam inlet 9, the other end of economizer bank 10 are secondary steam condensation-water drain 15；A certain number of heating are set in bringing-up section Pipe 12 walks primary steam in heating tube, and one end of heating tube 12 is primary steam import 11, and the other end of heating tube 12 is primary Steam condensate (SC) outlet 14.

Workflow is as follows: surrounding air enters air from the ambient air inlet 8 of the cylinder 16 of air heater 3 and heats The shell side of device 3 is preheated secondary steam for preheating in pipe 10 in preheating section, and the air after preheating enters heating from the shell side of preheating section Material after the shell side of section is heated the heating of the primary steam in pipe 12, after removing to be further dried multiple-effect evaporation by hot air outlet 13 Slurry；In this way, completing the comprehensive utilization of ammonium phosphate system waste heat.

Claims

1. ammonium phosphate system low temperature exhaust heat comprehensive utilization device, it is characterized in that: the residual heat using device includes air heater (3), Air heater (3) is added by constituting air in the cylinder (16) of both ends setting ambient air inlet (8) and hot air outlet (13) The ontology of hot device, cylinder (16) is interior to be divided into preheating section and bringing-up section；A certain number of economizer banks (10) are set in preheating section, in advance Secondary steam is walked in heat pipe, one end of economizer bank (10) is secondary steam import (9), and the other end of economizer bank (10) is secondary steaming Vapour condensation-water drain (15)；It is arranged in bringing-up section a certain number of heating tubes (12), walks primary steam, heating tube in heating tube (12) one end is primary steam import (11), and the other end of heating tube (12) is primary steam condensation-water drain (14).