CN-122003289-A - Ammonia removal device and method

Abstract

An ammonia removal device for removing ammonia-containing gas having a pressure higher than the atmospheric pressure in an ammonia supply system is provided with a tank that stores ammonia removal liquid and has a discharge port at the top, a water spray nozzle that opens in a gas phase portion between the liquid surface of the removal liquid in the tank and the discharge port in the vertical direction, an in-water spray nozzle that opens in the removal liquid, an in-gas spray nozzle that opens in the gas phase portion, and an ammonia-containing gas system that causes the ammonia-containing gas to flow from the ammonia supply system to the in-water spray nozzle and the in-gas spray nozzle.

Inventors

• SHI YUANJUN
• YAMAGUCHI YASUNOBU

Assignees

• 川崎重工业株式会社

Dates

Publication Date

20260508

Application Date

20240729

Priority Date

20231026

Claims (12)

1. 1. An ammonia removal device for removing ammonia-containing gas having a pressure higher than atmospheric pressure in an ammonia supply system, The ammonia removal device comprises: A storage tank for storing ammonia removal liquid, the storage tank having a discharge outlet at the top; A water spray nozzle that opens in a gas phase portion between a liquid surface of the removal liquid in the tank and a vertical direction of the discharge port; an in-water nozzle that opens into the removal liquid; an in-gas nozzle opening at the gas phase portion, and An ammonia-containing gas system that flows the ammonia-containing gas from the ammonia supply system to the in-water nozzle and the in-gas nozzle.
2. 2. The ammonia removal device according to claim 1, wherein, The underwater nozzle comprises: a1 st water nozzle opening at the bottom of the sump, and And a2 nd water nozzle which is opened between the 1 st water nozzle and the upper and lower direction of the liquid surface of the removing liquid.
3. 3. The ammonia removal device according to claim 2, wherein, Among the above-mentioned underwater nozzle and the above-mentioned air nozzle, the nozzle outlet total area of the nozzles which are arranged above the above-mentioned vertical direction and are opened at the same height in the above-mentioned vertical direction is smaller.
4. 4. The ammonia removal device according to claim 1, wherein, The in-water nozzle has a microbubble generator for micronizing the ammonia-containing gas that is blown out.
5. 5. The ammonia removal device according to claim 1, wherein, The in-gas nozzle is configured to blow out the ammonia-containing gas toward water ejected from the water spray nozzle.
6. 6. The ammonia removal device according to claim 1, wherein, The in-gas nozzle is configured to mix and blow out the ammonia-containing gas with water.
7. 7. The ammonia removal device according to claim 1, wherein, The ammonia-containing gas system comprises: a main pipe connected to the ammonia supply system; an in-water blowing pipe connecting the main pipe and the in-water nozzle, and And an in-gas blowing pipe connecting the main pipe and the in-gas nozzle.
8. 8. The ammonia removal device according to claim 7, wherein, The ammonia-containing gas system comprises: a1 st valve for opening and closing the in-water blowing pipe, and And a 2 nd valve for opening and closing the in-gas blowing pipe.
9. 9. The ammonia removal device according to claim 8, wherein, The ammonia removal device further comprises: a pressure sensor for detecting the in-pipe pressure of the ammonia supply system, and A control device for controlling opening and closing operations of the 1 st valve and the 2 nd valve based on the in-pipe pressure detected by the pressure sensor, The control device is configured to switch from a state in which the 1 st valve is opened and the 2 nd valve is closed to blow the ammonia-containing gas from the in-water nozzle to a state in which the 2 nd valve is opened and the 1 st valve is closed to blow the ammonia-containing gas from the in-air nozzle when the in-pipe pressure is equal to or lower than a predetermined pressure threshold.
10. 10. The ammonia removal device according to claim 9, wherein, The pressure threshold value is a value obtained by multiplying the water pressure at the outlet of the underwater nozzle by a variable of 1 to 1.1.
11. 11. The ammonia removal device according to claim 9, wherein, The ammonia removal device further comprises: A water spray valve for switching between supplying water to the water spray nozzle and stopping supplying water, and A bleed valve that switches between allowing and stopping the flow of the ammonia-containing gas from the ammonia supply system, The control device is configured to control opening and closing operations of the discharge valve and the sprinkler valve so that the sprinkler valve is opened and closed in conjunction with opening and closing of the discharge valve.
12. 12. An ammonia removal method for removing ammonia-containing gas having a pressure higher than atmospheric pressure in an ammonia supply system, The ammonia removal method comprises the following steps: blowing the ammonia-containing gas into the removal liquid in a tank storing the removal liquid of ammonia through an in-water blowing pipe connected to the ammonia supply system; sprinkling water to a gas phase part between the liquid level of the removing liquid in the storage tank and the upper and lower directions of a discharge outlet at the top of the storage tank, and The ammonia-containing gas is blown in contact with water sprayed to the gas phase portion via a gas-in-gas blowing pipe connected to the ammonia supply system.

Description

Ammonia removal device and method Technical Field The present disclosure relates to an ammonia removal device and method for removing ammonia components in an ammonia-containing gas. Background Conventionally, facilities using ammonia have an ammonia removal device, and ammonia-containing gas is separated in the ammonia removal device to remove ammonia components and then released to the atmosphere. Patent document 1 discloses such an ammonia removal device. The ammonia removal device disclosed in patent document 1 includes a tank that stores an aqueous sulfuric acid solution as an absorption liquid of ammonia, an exhaust pipe disposed at the top of the tank, and an ammonia-containing gas blowing pipe having a blowing inlet disposed at the bottom of the tank. When ammonia-containing gas is blown into the bottom of the tank via the ammonia-containing gas blowing pipe, ammonia in the gas is absorbed and removed by the absorbing liquid. The ammonia-removed gas is released to the atmosphere through an exhaust pipe. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2001-239130 Disclosure of Invention Problems to be solved by the invention In the structure in which ammonia-containing gas fed to the ammonia removal device through the pipe is discharged to the atmosphere after removing ammonia components in the removal tank containing the ammonia removal liquid, when the inflow of new ammonia-containing gas into the pipe is stopped, the in-pipe pressure in the pipe gradually decreases, and eventually converges to a pressure equivalent to the pressure of the blowing port of the ammonia-containing gas in the removal tank. Since the blowing port for removing the ammonia-containing gas in the tank is located in the removing liquid, the pressure is higher than the atmospheric pressure. As a result, after the end of the release of the atmosphere from the ammonia removal device, the pressure in the piping is maintained at a higher level than the atmospheric pressure. That is, the pressure in the piping is higher than the atmospheric pressure, and there is a risk that ammonia-containing gas will leak from the piping. The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a technique for suppressing leakage of an ammonia-containing gas remaining in a pipe after the end of the atmospheric emission in a structure in which the ammonia-containing gas fed to an ammonia removal device via the pipe is emitted to the atmosphere after ammonia components are removed in the ammonia removal device. Means for solving the problems In order to solve the above problems, an ammonia removal device according to one embodiment of the present disclosure is an ammonia removal device for removing ammonia-containing gas having a pressure higher than atmospheric pressure in an ammonia supply system, wherein the ammonia removal device includes a tank that stores ammonia removal liquid and has a discharge port at a top portion, a water spray nozzle that opens in a gas phase portion between a liquid surface of the removal liquid in the tank and a vertical direction of the discharge port, an in-water spray nozzle that opens in the removal liquid, an in-gas spray nozzle that opens in the gas phase portion, and an ammonia-containing gas system that causes the ammonia-containing gas to flow from the ammonia supply system to the in-water spray nozzle and the in-gas spray nozzle. In order to solve the above problems, an ammonia removal method according to one embodiment of the present disclosure is an ammonia removal method for removing an ammonia-containing gas having a pressure higher than the atmospheric pressure in an ammonia supply system, the ammonia removal method comprising the steps of blowing the ammonia-containing gas into a removal liquid in a tank containing the removal liquid of ammonia through an in-water blowing pipe connected to the ammonia supply system, sprinkling water to a gas phase portion between the liquid surface of the removal liquid in the tank and the top discharge port of the tank in the vertical direction, and blowing the ammonia-containing gas into the tank in contact with water sprayed to the gas phase portion through an in-gas blowing pipe connected to the ammonia supply system. Effects of the invention According to the present disclosure, in the structure in which the ammonia-containing gas fed to the ammonia removal device via the pipe is released to the atmosphere after the ammonia component is removed in the removal device, leakage of the ammonia-containing gas remaining in the pipe after the end of the release of the atmosphere can be suppressed. Drawings Fig. 1 is a schematic configuration diagram of an ammonia supply system having an ammonia removal device according to an embodiment of the present disclosure. Fig. 2 is a schematic configuration diagram of an ammonia removal device according to an embodiment of the pr