CN214095691U

CN214095691U - Ammonium nitrate apparatus for producing technology steam waste heat recovery utilizes system

Info

Publication number: CN214095691U
Application number: CN202023082564.4U
Authority: CN
Inventors: 徐东昇; 张增房
Original assignee: Inner Mongolia Yidong Group Jiuding Chemical Co ltd
Current assignee: Inner Mongolia Yidong Group Jiuding Chemical Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-08-31
Anticipated expiration: 2030-12-18

Abstract

The utility model discloses a process steam waste heat recycling system of an ammonium nitrate production device, which comprises a process steam purification unit, an ammonia preheater, a primary evaporator, a pre-drying air heater and a first drying air heater; a process steam outlet of the neutralization steam washing tower of the process steam purification unit is respectively connected with a heat medium inlet of the ammonia preheater, a heat medium inlet of the primary evaporator, a heat medium inlet of the pre-drying air heater and a heat medium inlet of the first drying air heater; the utility model discloses the process steam of about 150 ℃ after will purifying is ammonia preheater, primary evaporator, predrying air heater and first dry air heater respectively and provides heat energy, make full use of process steam waste heat, greatly reduced system energy consumption.

Description

Ammonium nitrate apparatus for producing technology steam waste heat recovery utilizes system

The technical field is as follows:

the utility model relates to an equipment field is used in the ammonium nitrate production, especially relates to an ammonium nitrate apparatus for producing technology steam waste heat recovery utilizes system.

Background art:

at present, as shown in fig. 1, the ammonium nitrate production process is as follows: liquid ammonia from an ammonia synthesis device 7 enters a liquid ammonia storage tank 8 for flash evaporation, the liquid ammonia sequentially enters an ammonia evaporator 9 and an ammonia air cooler 10 from the bottom of the liquid ammonia storage tank 8, circulating water and air are respectively used as heat sources to evaporate the liquid ammonia into gas ammonia, and then the gas ammonia returns to the liquid ammonia storage tank 8; the gas ammonia in the liquid ammonia storage tank 8 is filtered to remove oil and water through a gas ammonia fine filter 11, enters an ammonia preheater 2, is heated and enters a tubular reactor 12, and is subjected to neutralization reaction with dilute nitric acid from a nitric acid device 13 to generate an ammonium nitrate solution. The generated ammonium nitrate solution enters a flash evaporation tank 1-1 of the reactor for flash evaporation, process steam generated by flash evaporation is separated from the ammonium nitrate solution, the ammonium nitrate solution is discharged from the bottom and directly condensed by a washing process condenser 15 to enter a condensate tank 6 of a washing process, the process condensate is sent out of a boundary area to a water treatment device, but the temperature of the process steam is above 150 ℃, and the process steam is directly condensed, so a large amount of heat energy is wasted. The ammonium nitrate solution from the bottom of the flash evaporation tank 1-1 of the reactor enters a primary evaporator receiving tank 16, then enters a primary evaporator 17 by means of potential difference, the ammonium nitrate solution is concentrated, then the ammonium nitrate solution enters a primary evaporator separator 18 to separate steam, the concentrated ammonium nitrate solution enters a redissolution tank 19, a proper amount of ammonia gas is added into the tank to adjust the pH value of the ammonium nitrate solution, then the ammonium nitrate solution is pumped to a tower top receiving tank 20, a small amount of ammonia gas is also added into the tower top receiving tank 20 to adjust the pH value, meanwhile, an additive is added, the ammonium nitrate solution is fully mixed under the stirring action, the ammonium nitrate solution enters a granulation spray head by means of potential difference, granular ammonium nitrate falls from the top of a granulation tower 21 and is in countercurrent contact with rising air to be cooled, and ammonium nitrate granules fall into a funnel and then enter a conveying belt at the bottom.

The ammonium nitrate granules from the prilling tower 21 are sent via a conveyor belt to a drying drum feed conveyor belt and then to the drying drum 14. The drying drum 14 is divided into a pre-drying section and a drying section, and in the pre-drying section, air heated by the pre-drying air heater 4 flows in the same direction with the materials; in the drying section, the air heated by the first drying air heater 5 flows in the reverse direction to the material. Finished products discharged from the drying drum 14 are conveyed to the bucket elevator through a discharging conveying belt of the drying drum and a feeding belt of the bucket elevator.

In the existing ammonium nitrate production process, the ammonia preheater 2, the primary evaporator 3, the pre-drying air heater 4 and the first drying air heater 5 all need to consume a large amount of heat energy, and the energy consumption of the system is high.

The utility model has the following contents:

for reducing ammonium nitrate production energy consumption, make full use of system heat energy, the utility model aims to provide an ammonium nitrate apparatus for producing technology steam waste heat recovery utilizes system.

The utility model discloses by following technical scheme implement: the system for recycling the process steam waste heat of the ammonium nitrate production device comprises a process steam purification unit, an ammonia preheater, a primary evaporator, a pre-drying air heater and a first drying air heater; a process steam outlet of the neutralization steam washing tower of the process steam purification unit is respectively connected with a heat medium inlet of the ammonia preheater, a heat medium inlet of the primary evaporator, a heat medium inlet of the pre-drying air heater and a heat medium inlet of the first drying air heater; and the heat medium outlet of the ammonia preheater, the heat medium outlet of the primary evaporator, the heat medium outlet of the pre-drying air heater and the heat medium outlet of the first drying air heater are connected with the inlet of the condensate tank.

Further, the process steam purification unit comprises a reactor flash tank, a venturi scrubber and a neutralization steam scrubber; and a process steam outlet of the flash tank of the reactor is connected with a process steam inlet of the venturi scrubber, and a process steam outlet of the venturi scrubber is connected with a process steam inlet of the medium steam scrubbing tower.

The utility model has the advantages that: the utility model discloses the process steam of about 150 ℃ after will purifying is ammonia preheater, primary evaporator, predrying air heater and first dry air heater respectively and provides heat energy, make full use of process steam waste heat, greatly reduced system energy consumption.

Description of the drawings:

FIG. 1 is a schematic diagram of an ammonium nitrate production apparatus.

FIG. 2 is a schematic diagram of a process steam waste heat recycling system of an ammonium nitrate production device.

The system comprises a process steam purification unit 1, a reactor flash tank 1-1, a venturi scrubber 1-2, a neutralizing steam scrubber 1-3, an ammonia preheater 2, a primary evaporator 3, a pre-drying air heater 4, a first drying air heater 5, a condensate tank 6, an ammonia synthesis device 7, a liquid ammonia storage tank 8, an ammonia evaporator 9, an ammonia air cooler 10, an ammonia fine filter 11, a tubular reactor 12, a nitric acid device 13, a drying rotary drum 14, a washing process condenser 15, a primary evaporator receiving tank 16, a primary evaporator 17, a primary evaporator separator 18, a re-dissolving tank 19, a tower top receiving tank 20 and a granulation tower 21.

The specific implementation mode is as follows:

as shown in fig. 2, the system for recycling the waste heat of the process steam of the ammonium nitrate production device comprises a process steam purification unit 1, an ammonia preheater 2, a primary evaporator 3, a pre-drying air heater 4 and a first drying air heater 5; the process steam purification unit 1 comprises a reactor flash evaporation tank 1-1, a Venturi scrubber 1-2 and a neutralization steam scrubber 1-3; the process steam outlet of the flash tank 1-1 of the reactor is connected with the process steam inlet of the venturi scrubber 1-2, and the process steam outlet of the venturi scrubber 1-2 is connected with the process steam inlet of the neutralization steam scrubber 1-3. The process steam outlets of the neutralization steam washing towers 1-3 are respectively connected with a heat medium inlet of the ammonia preheater 2, a heat medium inlet of the primary evaporator 3, a heat medium inlet of the pre-drying air heater 4 and a heat medium inlet of the first drying air heater 5; the heat medium outlet of the ammonia preheater 2, the heat medium outlet of the primary evaporator 3, the heat medium outlet of the pre-drying air heater 4 and the heat medium outlet of the first drying air heater 5 are all connected with the inlet of the condensate tank 6.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The system for recycling the process steam waste heat of the ammonium nitrate production device is characterized by comprising a process steam purification unit, an ammonia preheater, a primary evaporator, a pre-drying air heater and a first drying air heater; a process steam outlet of the neutralization steam washing tower of the process steam purification unit is respectively connected with a heat medium inlet of the ammonia preheater, a heat medium inlet of the primary evaporator, a heat medium inlet of the pre-drying air heater and a heat medium inlet of the first drying air heater; and the heat medium outlet of the ammonia preheater, the heat medium outlet of the primary evaporator, the heat medium outlet of the pre-drying air heater and the heat medium outlet of the first drying air heater are connected with the inlet of the condensate tank.

2. The system for recycling the waste heat of the process steam of the ammonium nitrate production device according to claim 1, wherein the process steam purification unit comprises a reactor flash tank, a venturi scrubber and a neutralization steam scrubber; and a process steam outlet of the flash tank of the reactor is connected with a process steam inlet of the venturi scrubber, and a process steam outlet of the venturi scrubber is connected with a process steam inlet of the medium steam scrubbing tower.