CN207816088U - A kind of liquid ammonia evaporator coil pipe cleaning device - Google Patents

Abstract

The utility model discloses a liquid ammonia evaporator coil cleaning device, which comprises a liquid ammonia input pipe, a steam flushing pipe, and an ammonia gas output pipe. The outlet of the liquid ammonia input pipe communicates with the liquid ammonia inlet of the liquid ammonia evaporator. A liquid ammonia control valve is installed on the liquid ammonia input pipe; one end of the steam flushing pipe is connected with the nitrogen gas input pipe between the nitrogen control valve and the ammonia gas output pipe, and the other end of the steam flushing pipe is connected with the steam input pipe at the inlet end of the steam control valve , A flushing valve is installed on the steam flushing pipe. Advantages: the utility model introduces high-temperature steam into the outlet of ammonia gas through the steam flushing pipe. The grease in the ammonia coil dissolves, and the grease and impurities are discharged from the sewage pipe; during the process of purging the liquid ammonia coil, there is no need for technicians to disassemble and assemble the flange on the pipeline, avoiding the danger of ammonia poisoning.

Description

A liquid ammonia evaporator coil cleaning device

Technical field:

The utility model relates to the technical field of evaporator coil cleaning, in particular to a liquid ammonia evaporator coil cleaning device.

Background technique:

The liquid ammonia evaporator system is a device used to heat liquid ammonia into ammonia gas. It includes two sets of high-temperature steam coils and liquid ammonia coils. First, the high-temperature steam coil heats the water in the liquid ammonia evaporator, and then The heat is transferred to the liquid ammonia coil through water, and the liquid ammonia is heated into ammonia gas; the industrial liquid ammonia currently on the market will produce a large amount of impurities and grease during production, transportation and storage. In the daily production process, these impurities Oil and grease will deposit and adhere to the inner wall of the liquid ammonia coil. In this way, the liquid ammonia coil will be blocked for a long time, and the blockage of the coil will affect the normal production.

At present, when the liquid ammonia coil is clogged, the solution is to close the evaporator liquid ammonia inlet valve and the ammonia gas outlet valve. The front flange of the valve is removed as the inlet of the purge medium, and the purge medium is high-pressure nitrogen, but the use of high-pressure nitrogen can only purge loose particles and impurities out of the coil, and cannot discharge the grease in the coil to purge the coil Clean, it is difficult to completely solve the problem of coil blockage, and there is a major hidden danger of ammonia poisoning in the process of personnel dismantling the flange.

Utility model content:

The purpose of the utility model is to provide a liquid ammonia evaporator coil cleaning device which is cleaned.

The utility model is implemented by the following technical scheme: a liquid ammonia evaporator coil cleaning device, which includes a liquid ammonia input pipe, a steam input pipe, a steam flushing pipe, an ammonia gas output pipe, and a nitrogen gas input pipe. The outlet of the liquid ammonia evaporator is connected with the liquid ammonia inlet, and a liquid ammonia control valve is installed on the liquid ammonia input pipe, and the liquid ammonia input pipe between the liquid ammonia control valve and the liquid ammonia inlet There is a sewage discharge pipe connected to the top, and a sewage discharge valve is installed on the sewage discharge pipe; the inlet of the ammonia gas output pipe is connected with the ammonia gas outlet of the liquid ammonia evaporator, and the ammonia gas output pipe is installed on the ammonia gas outlet pipe. control valve, the outlet of the nitrogen input pipe communicates with the ammonia output pipe between the ammonia control valve and the ammonia outlet, and a nitrogen control valve is installed on the nitrogen input pipe; the steam The outlet of the input pipe is communicated with the steam inlet of the liquid ammonia evaporator, and a steam control valve is installed on the steam input pipe; one end of the steam flushing pipe is connected with the nitrogen control valve and the ammonia output pipe. The other end of the steam flushing pipe communicates with the steam input pipe at the inlet end of the steam control valve, and a flushing valve is installed on the steam flushing pipe.

Further, the liquid ammonia control valve is a solenoid valve, and a pressure transmitter is installed on the ammonia gas output pipe between the nitrogen gas input pipe and the ammonia gas outlet, and the pressure transmitter is connected with the control valve. The input end of the controller is connected, and the output end of the controller is connected with the liquid ammonia control valve.

Further, the steam control valve is a solenoid valve, and a temperature transmitter is installed inside the housing of the liquid ammonia evaporator, and the temperature transmitter is connected to the input end of the controller, and the controller The output end is connected with the steam control valve.

Advantages of the utility model: the utility model introduces high-temperature steam into the ammonia gas outlet through the steam flushing pipe. When the liquid ammonia coil in the liquid ammonia evaporator is blocked, the high-temperature steam is introduced into the liquid ammonia coil through the steam flushing pipe, which can Effectively dissolve the grease in the liquid ammonia coil, and discharge the grease and impurities from the sewage pipe; during the process of purging the liquid ammonia coil, there is no need for technicians to disassemble and assemble the flange on the pipeline, avoiding the risk of personnel being poisoned by ammonia Danger.

Description of drawings:

Figure 1 is a schematic diagram of the overall structure of the utility model.

The marks of the components in the drawings are as follows: liquid ammonia evaporator 1, liquid ammonia input pipe 2, steam input pipe 3, steam flushing pipe 4, ammonia gas output pipe 5, nitrogen gas input pipe 6, liquid ammonia inlet 7, liquid ammonia control Valve 8, sewage pipe 9, sewage valve 10, ammonia outlet 11, ammonia control valve 12, nitrogen control valve 13, steam inlet 14, steam control valve 15, flushing valve 16, pressure transmitter 17, temperature transmitter 18. Condensed water pipe 19, drain valve 20, controller 21.

Detailed ways:

As shown in Figure 1, a liquid ammonia evaporator coil cleaning device includes a liquid ammonia input pipe 2, a steam input pipe 3, a steam flushing pipe 4, an ammonia gas output pipe 5, a nitrogen gas input pipe 6, and a liquid ammonia input pipe The outlet of 2 communicates with the liquid ammonia inlet 7 of the liquid ammonia evaporator 1, and the liquid ammonia control valve 8 is installed on the liquid ammonia input pipe 2, and the liquid ammonia input pipe 2 between the liquid ammonia control valve 8 and the liquid ammonia inlet 7 The top is connected with a sewage pipe 9, and a sewage valve 10 is installed on the sewage pipe 9; the inlet of the ammonia gas output pipe 5 is connected with the ammonia gas outlet 11 of the liquid ammonia evaporator 1, and the ammonia gas control valve is installed on the ammonia gas output pipe 5. Valve 12, the outlet of nitrogen input pipe 6 communicates with the ammonia output pipe 5 between ammonia control valve 12 and ammonia outlet 11, and nitrogen control valve 13 is installed on nitrogen input pipe 6; The outlet of steam input pipe 3 is connected with The steam inlet 14 of the liquid ammonia evaporator 1 is communicated, and a steam control valve 15 is installed on the steam input pipe 3; one end of the steam flushing pipe 4 is communicated with the nitrogen input pipe 6 between the nitrogen control valve 13 and the ammonia output pipe 5, The other end of the steam flushing pipe 4 communicates with the steam input pipe 3 at the inlet end of the steam control valve 15, and a flushing valve 16 is installed on the steam flushing pipe 4. When the liquid ammonia coil in the liquid ammonia evaporator 1 is blocked, by introducing high temperature The steam purges the liquid ammonia coil to discharge the grease and impurities in the liquid ammonia coil, and then blows nitrogen to purify to discharge the steam remaining in the liquid ammonia coil, so as to avoid the ammonia gas generated during the normal operation of the system and after purging The high-temperature steam remaining in the liquid ammonia coil mixed and exploded.

The liquid ammonia control valve 8 is a solenoid valve, and a pressure transmitter 17 is installed on the ammonia gas output pipe 5 between the nitrogen gas input pipe 6 and the ammonia gas outlet 11, and the pressure transmitter 17 is connected with the input end of the controller 21 to control The output end of the device 21 is connected to the liquid ammonia control valve 8. When the liquid ammonia coil is blocked and the pressure at the ammonia gas outlet 11 is lower than the set value of the pressure transmitter 17, the pressure transmitter 17 transmits a feedback signal to the controller 21, and then Control the opening of the liquid ammonia control valve 8 to increase.

The steam control valve 15 is a solenoid valve, and a temperature transmitter 18 is installed inside the shell of the liquid ammonia evaporator 1. The temperature transmitter 18 is connected to the input end of the controller 21, and the output end of the controller 21 is connected to the steam control valve 15. connection, when the liquid ammonia coil is blocked, the evaporation of liquid ammonia in the liquid ammonia coil decreases, and the heat taken away from the water in the liquid ammonia evaporator 1 decreases, causing the water temperature to rise. When the water temperature is higher than the temperature transmitter 18 When the value is set, the temperature transmitter 18 transmits a feedback signal to the controller 21, thereby controlling the opening of the steam control valve 15 to decrease.

Instructions for use: During the normal operation of the liquid ammonia evaporator system, open the steam control valve 15, drain valve 20, liquid ammonia control valve 8, and ammonia gas control valve 12, close the blowdown valve 10, nitrogen control valve 13, and flushing valve 16. The steam enters the liquid ammonia evaporator 1 through the steam input pipe 3, and the liquid ammonia enters the liquid ammonia evaporator 1 through the liquid ammonia input pipe 2. In the liquid ammonia evaporator 1, the liquid ammonia absorbs the heat of the steam and evaporates into gas ammonia, and then evaporates from ammonia The gas output pipe 5 outputs, and the steam and liquid ammonia are condensed into condensed water after heat exchange and then discharged from the condensed water pipe 19; in the above process, the pressure transmitter 17 transmits the detected pressure value to the controller 21 in real time. When the pressure value received by the pressure transmitter 21 is less than the set value of the pressure transmitter 17, it indicates that the liquid ammonia coil is blocked. At this time, the pressure transmitter 17 controls the opening of the liquid ammonia control valve 8 to increase. When the amount of liquid ammonia is reduced, the heat taken away by the liquid ammonia from the water in the liquid ammonia evaporator 1 is reduced. When the water temperature is higher than the set value of the temperature transmitter 18, the temperature transmitter 18 transmits a feedback signal to the controller 21, and then controls the steam control. The opening of the valve 15 is reduced to reduce heat loss; if the opening of the liquid ammonia control valve 8 is increased, the controller 21 receives the pressure value transmitted by the pressure transmitter 17 and returns to the set value of the pressure transmitter 17 , it means that the liquid ammonia coil is no longer blocked; if the controller 21 receives the pressure value transmitted by the pressure transmitter 17 after the opening of the liquid ammonia control valve 8 is increased, it is still lower than the set value of the pressure transmitter 17, It shows that the liquid ammonia coil is still blocked. At this time, close the steam control valve 15, the drain valve 20, the liquid ammonia control valve 8 and the ammonia gas control valve 12, open the flushing valve 16 and the drain valve 10, and the high-temperature steam passes through the 4 pairs of steam flushing pipes. The sundries and grease in the liquid ammonia coil are heated and dissolved, and the grease and impurities in the liquid ammonia coil are backwashed to the liquid ammonia input pipe 2 and then discharged from the sewage pipe 9. When it is observed that there are no more impurities and impurities in the sewage pipe 9 When the grease is discharged, it means that the liquid ammonia coil is completely unblocked. At this time, close the flushing valve 16, open the nitrogen control valve 13, nitrogen enters the liquid ammonia coil through the nitrogen input pipe 6, and discharges the high-temperature steam remaining in the liquid ammonia coil from the sewage pipe. 9 discharge, when no high-temperature gas is discharged from the sewage pipe 9, it means that the steam is completely discharged. At this time, close the nitrogen control valve 13 and the sewage valve 10, open the steam control valve 15, the drain valve 20, the liquid ammonia control valve 8 and the ammonia gas Control valve 12, the liquid ammonia evaporator system begins to operate normally.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (3)

1. A liquid ammonia evaporator coil cleaning device is characterized in that it comprises a liquid ammonia input pipe, a steam input pipe, a steam flushing pipe, an ammonia gas output pipe, and a nitrogen gas input pipe, and the outlet of the liquid ammonia input pipe is connected to the The liquid ammonia inlet of the liquid ammonia evaporator is connected, a liquid ammonia control valve is installed on the liquid ammonia input pipe, and a liquid ammonia input pipe is connected between the liquid ammonia control valve and the liquid ammonia inlet. A blowdown pipe, a blowdown valve is installed on the blowdown pipe; the inlet of the ammonia output pipe communicates with the ammonia outlet of the liquid ammonia evaporator, and an ammonia control valve is installed on the ammonia output pipe, The outlet of the nitrogen input pipe communicates with the ammonia output pipe between the ammonia control valve and the ammonia outlet, and a nitrogen control valve is installed on the nitrogen input pipe; The outlet is communicated with the steam inlet of the liquid ammonia evaporator, and a steam control valve is installed on the steam input pipe; one end of the steam flushing pipe is connected to the nitrogen control valve and the ammonia output pipe. The nitrogen input pipe is connected, the other end of the steam flushing pipe is connected with the steam input pipe at the inlet end of the steam control valve, and a flushing valve is installed on the steam flushing pipe. 2. A coil cleaning device for a liquid ammonia evaporator according to claim 1, wherein the liquid ammonia control valve is a solenoid valve, and the valve between the nitrogen gas input pipe and the ammonia gas outlet is A pressure transmitter is installed on the ammonia output pipe, the pressure transmitter is connected to the input end of the controller, and the output end of the controller is connected to the liquid ammonia control valve. 3. A liquid ammonia evaporator coil cleaning device according to claim 2, wherein the steam control valve is a solenoid valve, and a temperature transmitter is installed inside the housing of the liquid ammonia evaporator The temperature transmitter is connected to the input end of the controller, and the output end of the controller is connected to the steam control valve.