Comprehensive utilization device for nitric acid waste heat power generation energy

Abstract

The utility model relates to a nitric acid waste heat power generation energy comprehensive utilization device which comprises an oxidation furnace, a back pressure steam turbine, a power generator, a nitric oxide compressor, an air compressor and a waste heat boiler. A high-pressure steam pipeline of the oxidation furnace is connected with a steam inlet of the back-pressure steam turbine, an output shaft of the back-pressure steam turbine is connected with the generator, the generator is used for supplying power to a high-pressure power distribution system of the unit, and a steam outlet of the back-pressure steam turbine is communicated with a first low-pressure steam pipeline; a nitric oxide gas pipeline of the oxidation furnace is connected with the nitric oxide compressor, an output shaft of the nitric oxide compressor is connected with an input shaft of the air compressor, and a gas outlet of the air compressor is connected with an air inlet of the waste heat boiler; and an air pipeline of the waste heat boiler is communicated with an air inlet of the oxidizing furnace. The device recycles steam, saves energy, is beneficial to energy conservation and emission reduction, and is environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitric acid production equipment, and particularly relates to a device for comprehensively utilizing the energy of nitric acid waste heat power generation. Background Technique

[0002] At present, the most advanced production technology for nitric acid at home and abroad is the "double pressure method" process technology, and the corresponding device for this process technology is a double pressure nitric acid device; the traditional "four-in-one unit": steam turbine, nitric oxide compressor, air compressor and tail gas turbine, and the oxidation furnace are important reaction equipment in the double pressure nitric acid device. After the oxidation reaction in the oxidation furnace, a huge amount of heat is generated, and the air also has a high compression heat after being compressed by the air compressor. If these two parts of heat are not comprehensively utilized, a large amount of energy loss and energy waste will be caused. Content of the Utility Model

[0003] The purpose of the utility model is to provide a device for comprehensively utilizing the energy of nitric acid waste heat power generation to solve the technical problems put forward in the background technique.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A device for comprehensively utilizing the energy of nitric acid waste heat power generation, which includes: an oxidation furnace, a back-pressure steam turbine, a generator, a nitric oxide compressor, an air compressor and a waste heat boiler;

[0006] The high-pressure steam pipeline of the oxidation furnace is connected to the steam inlet of the back-pressure steam turbine, the output shaft of the back-pressure steam turbine is connected to the generator, the generator is used to supply power to the high-voltage power distribution system of the unit, and the steam outlet of the back-pressure steam turbine is connected to a low-pressure steam pipeline;

[0007] The nitric oxide gas pipeline of the oxidation furnace is connected to the nitric oxide compressor, the output shaft of the nitric oxide compressor is connected to the input shaft of the air compressor, and the gas outlet of the air compressor is connected to the air inlet of the waste heat boiler; the air pipeline of the waste heat boiler is connected to the air inlet of the oxidation furnace.

[0008] As a further improvement of the utility model, it also includes an ammonia superheater and a dilute nitric acid deoxidation tank, and the air inlets of both the ammonia superheater and the dilute nitric acid deoxidation tank are connected to a second low-pressure steam pipeline of the waste heat boiler;

[0009] The air outlet of the ammonia superheater is connected to the ammonia inlet of the oxidation furnace.

[0010] As a further improvement of the present invention, it also includes a variable frequency motor and an exhaust gas turbine, the output shaft of the variable frequency motor is connected to the input shaft of the nitrogen oxide compressor, and the input shaft of the exhaust gas turbine is connected to the output shaft of the air compressor.

[0011] As a further improvement of the present invention, it further comprises an ammonia evaporator, and the air outlet of the ammonia evaporator is communicated with the air inlet of the ammonia superheater.

[0012] As a further improvement of the present invention, it further comprises a nitric acid absorption tower, wherein the air inlet of the nitric acid absorption tower is communicated with the air outlet of the nitrogen oxide compressor.

[0013] As a further improvement of the present invention, the heat exchange tubes of the ammonia evaporator are made of stainless steel.

[0014] As a further improvement of the present invention, valves are provided on the low-pressure steam pipe 1, the high-pressure steam pipe, the nitrogen oxide gas pipe and the air pipe.

[0015] The beneficial effects of adopting the above technical solution are:

[0016] This utility model is equipped with a back-pressure steam turbine connected to the high-pressure steam pipeline of the oxidation furnace. A generator is connected to the back-pressure steam turbine, which uses the high-temperature, high-pressure steam produced by the oxidation furnace to generate electricity. The generated electricity supplies power to the high-voltage power distribution system of the unit. The low-pressure steam pipeline is cooled to 190°C by water spraying and then supplied to the next level of steam users. For example, it is connected to the heat network pipeline to provide a heat source for residential heating and reduce coal consumption. It can also be supplied to industrial steam pipelines for use. An exhaust gas boiler is installed to recover waste heat from the outlet air of the air compressor, increasing steam production. The recovered steam can be supplied to the ammonia superheater and the dilute nitric acid deoxidation tank for full utilization of the waste heat.

[0017] The utility model comprehensively utilizes the huge heat generated by the oxidation reaction in the oxidation furnace and the relatively high compression heat generated by the air compressed by the air compressor, saves energy, is beneficial to energy conservation and emission reduction, and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Explanation of the marks in the figure: 1 oxidation furnace, 2 back pressure steam turbine, 3 generator, 4 nitrogen oxide compressor, 5 air compressor, 6 waste heat boiler, 7 high-pressure steam pipeline, 8 low-pressure steam pipeline 1, 9 nitrogen oxide gas pipeline, 10 air pipeline, 11 ammonia superheater, 12 dilute nitric acid deoxidation tank, 13 low-pressure steam pipeline 2, 14 variable frequency motor, 15 tail gas turbine, 16 ammonia evaporator, 17 nitric acid absorption tower. DETAILED DESCRIPTION

[0020] To better understand the purpose, structure and function of the present utility model, the present utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] As Figure 1 shown, a nitric acid waste heat power generation energy comprehensive utilization device includes a "four-in-one unit" of a variable frequency motor 14, a nitrogen oxide compressor 4, an air compressor 5 and an exhaust gas turbine 15; wherein, the output shaft of the variable frequency motor 14 is connected to the input shaft of the nitrogen oxide compressor 4, the output shaft of the nitrogen oxide compressor 4 is connected to the input shaft of the air compressor 5, and the output shaft of the air compressor 5 is connected to the input shaft of the exhaust gas turbine 15. Specifically, the shafts of the "four-in-one unit" are connected by couplings. In this embodiment, the traditional steam turbine is replaced by the variable frequency motor 14, which is convenient for subsequent treatment and utilization of the steam consumed by the original steam turbine.

[0022] This device further includes an oxidation furnace 1, a back pressure steam turbine 2, a generator 3, and a waste heat boiler 6; the high-pressure steam pipeline 7 of the oxidation furnace 1 is connected to the steam inlet of the back pressure steam turbine 2, the output shaft of the back pressure steam turbine 2 is connected to the generator 3, and the generator 3 is used to supply power to the high-voltage power distribution system of the unit. In this embodiment, the high-pressure steam generated by the oxidation furnace 1 is steam with a pressure of 3.8 Mpa and a back pressure of 1.1 Mpa. The steam outlet of the back pressure steam turbine 2 is connected to the low-pressure steam pipeline 1 8, that is, the 1.1 Mpa steam flows in the low-pressure steam pipeline 1 8, is cooled to 190 °C by spraying water, and is sent to the next-level steam user for use. For example, it is connected to the heat network pipeline to provide heat source for heating residents and reduce coal consumption; it can also be transported to the industrial steam pipeline for use.

[0023] The nitrogen oxide gas pipeline 9 of the oxidation furnace 1 is connected to the nitrogen oxide compressor 4 to compress the nitrogen oxide gas. This embodiment further includes a nitric acid absorption tower 17. The air inlet of the nitric acid absorption tower 17 is connected to the air outlet of the nitrogen oxide compressor 4, which is used to absorb the nitrogen oxide gas produced in the nitrogen oxide compressor 4 and generate nitric acid using the nitrogen oxide gas. The gas outlet of the nitric acid absorption tower 17 is connected to the exhaust gas turbine 15, and the exhaust gas after being processed by the exhaust gas turbine 15 is discharged into the atmosphere.

[0024] The air inlet of the air compressor 5 admits external air, and its gas outlet is connected to the air inlet of the waste heat boiler 6. The waste heat boiler 6 is a low-pressure waste heat boiler 6 that recovers the steam produced by the air compressor 5. The pressure of the recovered steam is 0.6 Mpa, increasing the steam output. The air pipeline 10 of the waste heat boiler 6 is connected to the air inlet of the oxidation furnace 1. The compressed air after recovering the steam enters the oxidation furnace 1 through the air pipeline 10 to supply air to the oxidation furnace 1. Additionally, this embodiment further includes an ammonia superheater 11 and a dilute nitric acid deoxidation tank 12. The air inlets of both the ammonia superheater 11 and the dilute nitric acid deoxidation tank 12 are connected to the second low-pressure steam pipeline 13 of the waste heat boiler 6. The gas outlet of the ammonia superheater 11 is connected to the ammonia inlet of the oxidation furnace 1 to supply ammonia to the oxidation furnace 1. The steam recovered by the waste gas boiler is sent to the ammonia superheater 11 and the dilute nitric acid deoxidation tank 12 for use, fully recovering and utilizing the waste heat.

[0025] Furthermore, this device also includes an ammonia evaporator 16 for generating ammonia. The gas outlet of the ammonia evaporator 16 is connected to the air inlet of the ammonia superheater 11. Moreover, the heat exchange tubes of the ammonia evaporator 16 are made of stainless steel, having good corrosion resistance and a long service life.

[0026] In addition, valves are provided on all pipelines for transporting gases, such as the first low-pressure steam pipeline 8, the high-pressure steam pipeline 7, the nitrogen oxide gas pipeline 9, the air pipeline 10, and the second low-pressure steam pipeline 13, facilitating the control of the entire device process.

[0027] It can be understood that the present utility model is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A comprehensive energy utilization device for nitric acid waste heat power generation, characterized by: It includes: Oxidation furnace (1), back pressure steam turbine (2), generator (3), nitrogen oxide compressor (4), air compressor (5) and waste heat boiler (6); The high-pressure steam pipe (7) of the oxidation furnace (1) is connected to the steam inlet of the back-pressure steam turbine (2), the output shaft of the back-pressure steam turbine (2) is connected to the generator (3), the generator (3) is used to supply power to the high-voltage power distribution system of the unit, and the steam outlet of the back-pressure steam turbine (2) is connected to the low-pressure steam pipe (8); The nitrogen oxide gas pipeline (9) of the oxidation furnace (1) is connected to the nitrogen oxide compressor (4), the output shaft of the nitrogen oxide compressor (4) is connected to the input shaft of the air compressor (5), the gas outlet of the air compressor (5) is connected to the air inlet of the waste heat boiler (6); and the air pipeline (10) of the waste heat boiler (6) is connected to the air inlet of the oxidation furnace (1).

2. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 1, characterized in that: It also includes an ammonia superheater (11) and a dilute nitric acid deoxidation tank (12), wherein the air inlet of the ammonia superheater (11) and the air inlet of the dilute nitric acid deoxidation tank (12) are both connected to the low-pressure steam pipe 2 (13) of the waste heat boiler (6); The gas outlet of the ammonia superheater (11) is connected to the ammonia gas inlet of the oxidation furnace (1).

3. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 1, characterized in that: It also includes a variable frequency motor (14) and an exhaust gas turbine (15), wherein the output shaft of the variable frequency motor (14) is connected to the input shaft of the nitrogen oxide compressor (4), and the input shaft of the exhaust gas turbine (15) is connected to the output shaft of the air compressor (5).

4. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 2, characterized in that: It also includes an ammonia evaporator (16), and the gas outlet of the ammonia evaporator (16) is communicated with the gas inlet of the ammonia superheater (11).

5. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 1, characterized in that: It also includes a nitric acid absorption tower (17), and the air inlet of the nitric acid absorption tower (17) is communicated with the air outlet of the nitrogen oxide compressor (4).

6. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 4, characterized in that: The heat exchange tubes of the ammonia evaporator (16) are made of stainless steel.

7. The nitric acid waste heat power generation comprehensive energy utilization device according to claim 1, characterized in that: Valves are provided on the low-pressure steam pipe (8), the high-pressure steam pipe (7), the nitrogen oxide gas pipe (9) and the air pipe (10).

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