Device for removing oil and suspension from residual ammonia water

Abstract

The utility model discloses a device for removing oil and suspension from residual ammonia water. The device comprises a phase separator, an ammonia water filter and a heat exchanger, the phase separator is gas-liquid-solid three-phase separation equipment and is provided with a coil pipe, a coalescence plate, a water conduit and a water outlet cavity; oil collecting bags are fixed on the upper shell and the lower shell of the phase separator, and the two oil collecting bags are respectively connected with the upper blow-off pipeline and the lower blow-off pipeline; the two ammonia water filters are connected in parallel; upper and lower outlets of the two ammonia water filters are respectively connected with the upper and lower blow-off pipelines; the other side of the heat exchanger is connected with a tower kettle pipeline of the ammonia distillation tower, the bottom of the heat exchanger is connected with an ammonia distillation wastewater pipeline, and the top of the heat exchanger is connected with an upper pipeline of the ammonia distillation tower. According to the utility model, suspended matters and petroleum in the residual ammonia water are removed, so that the problem of system blockage is solved, and the product quality and the long-period stable operation of the system are ensured.

Description

Technical Field

[0001] The utility model relates to the field of ammonia water purification, in particular to a residual ammonia water deoiling and desuspension device. Background Art

[0002] In the coking industry, the coking coal usually contains 8% to 10% external moisture. During the coking process, the oxygen contained in the coal combines with hydrogen at high temperature to form chemical water accounting for about 2% to 4% of the dry coal mass. These two parts of moisture become water vapor during the coking process and escape with the raw coal gas. After condensation, except for a small amount of ammonia loss, the rest is residual ammonia.

[0003] The quality of residual ammonia water is complex, with a wide variety of components and a high concentration of pollutants. It needs to be removed from the water by a pretreatment device before it can enter the ammonia distillation process to remove ammonia nitrogen pollutants and ensure the stable operation of the biochemical treatment device.

[0004] In traditional pretreatment devices, after the remaining ammonia water passes through the ceramic filter, the remaining ammonia water directly enters the ammonia distillation unit. In order to ensure the long-term operation of the ceramic filter, the pore size of the ceramic filter element is relatively large, and it cannot ensure that the coal tar, benzene, naphthalene, etc. in the remaining ammonia water are completely separated, causing blockage of the tower plates and reboiler of the subsequent ammonia distillation tower, affecting its normal operation.

[0005] The residual ammonia water oil removal and desuspension device is installed in front of the ammonia distillation tower to separate the tar, benzene, naphthalene and wastewater in the residual ammonia water first, and the separated tar is discharged into the tar intermediate tank. The residual ammonia water enters the ceramic filter for further separation. The pore size of the ceramic filter element can be made very small to ensure the separation effect and the normal operation of the subsequent ammonia distillation unit. Utility Model Content

[0006] The utility model aims to provide a residual ammonia water deoiling and desuspension device, which realizes the removal of suspended matter and petroleum in the residual ammonia water, solves the problem of system blockage, and ensures product quality and long-term stable operation of the system.

[0007] The technical solution adopted by the utility model to solve the above problems is as follows:

[0008] A residual ammonia water deoiling and desuspension device, installed before the feed of the ammonia distillation tower, characterized in that it includes a phase separator, an ammonia water filter, and a heat exchanger;

[0009] The phase separator is a gas-liquid-solid three-phase separation device, which is provided with a coil, a coalescing plate, a water diversion pipe, and a water outlet chamber; the coil is located in the front chamber of the phase separator, and the coil is connected to the residual ammonia pipeline. The coalescing plate is fixed on the inner wall of the phase separator with an upper and lower offset, and is arranged at the rear end of the coil. The residual ammonia is introduced into the water outlet chamber through the water diversion pipe. The water outlet chamber is located at the rear end of the phase separator and is connected to the bottom pipeline of the ammonia filter; oil collecting bags are also fixed on the upper and lower shells of the phase separator, and the two oil collecting bags are respectively connected to the upper and lower sewage pipelines; there are two ammonia filters in parallel, and the upper and lower outlets of the two ammonia filters are respectively connected to the upper and lower sewage pipelines;

[0010] The remaining ammonia water after filtering through the ammonia water filter is connected to the pipeline on one side of the heat exchanger, and the other side of the heat exchanger is connected to the pipeline of the ammonia distillation tower kettle. The bottom of the heat exchanger is connected to the ammonia distillation wastewater pipeline, and the top is connected to the upper pipeline of the ammonia distillation tower.

[0011] Furthermore, ceramic membrane internals are arranged inside the two ammonia water filters.

[0012] The utility model has the following beneficial effects

[0013] 1. Pre-treat the remaining ammonia water through phase separator 1 to remove the larger suspended solids and petroleum in the system as much as possible to meet the process design requirements.

[0014] 2. Ammonia filter 2 is arranged at the front end of heat exchanger 3 to separate and filter fine particles and oil droplets, effectively preventing oil from clogging heat exchanger 3 and causing heat exchange efficiency to decrease and ammonia evaporation tower to be blocked. Ammonia filter 2 is used in one and used in another, which can make the performance of the entire oil removal and desuspension system better, the operation is stable, and the maintenance cost is lower.

[0015] 3. Heat exchanger 3 is set to exchange heat between the remaining ammonia water after filtration and the bottom liquid of the ammonia evaporation tower, and the remaining ammonia water after filtration is further heated by the heat of the bottom liquid, so as to make full use of the waste heat to achieve the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a residual ammonia water degreasing and desuspension device of the utility model;

[0017] Description of the accompanying drawings: phase separator 1, coil 1-1, coalescing plate 1-2, water diversion pipe 1-3, water outlet chamber 1-4, oil collecting bag 1-5, ammonia filter 2, ceramic membrane internals 2-1, heat exchanger 3. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1As shown, a residual ammonia water deoiling and desuspension device adopts a "temperature change + coalescence + filtration" combined process design route, and a phase separator 1, an ammonia water filter 2, and a heat exchanger 3 are arranged before the feeding of the ammonia distillation tower to achieve the purpose of deoiling and desuspension.

[0020] The remaining ammonia water is first input into the phase separator 1 through a pipeline. Its function is to pre-treat the remaining ammonia water through the phase separator 1 under normal production conditions of the system, and remove larger suspended matter and petroleum in the system as much as possible to meet the process design requirements.

[0021] The phase separator 1 is a gas-liquid-solid three-phase separation device, which is provided with a coil 1-1, a coalescing plate 1-2, a water guide pipe 1-3, a water outlet chamber 1-4, and an oil collecting bag 1-5. The coil 1-1 is located in the front chamber of the phase separator 1. Steam is introduced into the pipe to insulate the residual ammonia water, so that the residual ammonia water is kept at a constant temperature for sedimentation separation. The residual ammonia water after separation is further coalesced and separated by the coalescing plate 1-2. The coalescing plate 1-2 is arranged in an up-down staggered manner. The residual ammonia water after separation is led to the water outlet chamber 1-4 through the water guide pipe 1-3, and further sent to the ammonia filter 2 for treatment through a pipeline. The waste oil and waste residue after separation are collected in the oil collecting bag 1-5 and then discharged through a sewage pipe for sewage treatment;

[0022] The ammonia filter 2 is arranged at the front end of the heat exchanger 3 to separate and filter fine particles and oil droplets, effectively preventing oil from clogging the heat exchanger 3, thereby reducing the heat exchange efficiency and clogging the ammonia evaporation tower. The ammonia filter 2 is used in one and used in another, which can make the performance of the entire oil removal and desuspension system better, the operation is stable, and the maintenance cost is lower.

[0023] The ammonia filter 2 is a separation and filtration device with a ceramic membrane inner part 2-1 arranged inside. The remaining ammonia water entering the ammonia filter 2 is further filtered by the ceramic membrane inner part 2-1, and the oil is discharged through the upper and lower sewage pipes. The remaining ammonia water after filtration enters the heat exchanger 3 through the outlet pipe.

[0024] Heat exchanger 3 is a heat exchange device. The remaining ammonia water after filtration exchanges heat with the bottom liquid of the ammonia evaporation tower. The heat of the bottom liquid is used to further heat the remaining ammonia water after filtration, making full use of the waste heat to achieve the purpose of energy saving.

Claims

1. A residual ammonia water deoiling and desuspension device, installed before the feed of the ammonia distillation tower, characterized in that It comprises a phase separator (1), an ammonia water filter (2), and a heat exchanger (3); The phase separator (1) is a gas-liquid-solid three-phase separation device, and is provided with a coil (1-1), a coalescing plate (1-2), a water guide pipe (1-3), and a water outlet chamber (1-4); the coil (1-1) is located in the front chamber of the phase separator (1), the coil (1-1) is connected to the residual ammonia water pipeline, the coalescing plate (1-2) is fixed on the inner wall of the phase separator (1) with an upper and lower offset, and is arranged at the rear end of the coil (1); the residual ammonia water is introduced into the water outlet chamber (1-4) through the water guide pipe (1-3), and the water outlet chamber (1-4) is located at the rear end of the phase separator (1) and is connected to the bottom pipeline of the ammonia water filter (2); oil collecting bags (1-5) are also fixed on the upper and lower shells of the phase separator (1), and the two oil collecting bags (1-5) are respectively connected to the upper and lower sewage pipelines; two ammonia water filters (2) are connected in parallel, and the upper and lower outlets of the two ammonia water filters (2) are respectively connected to the upper and lower sewage pipelines; The remaining ammonia water after being filtered by the ammonia water filter (2) is connected to a pipeline on one side of a heat exchanger (3), and the other side of the heat exchanger (3) is connected to a pipeline of an ammonia distillation tower kettle. The bottom of the heat exchanger (3) is connected to an ammonia distillation wastewater pipeline, and the top is connected to an upper pipeline of an ammonia distillation tower.

2. The excess ammonia water deoiling and desuspension device as claimed in claim 1, characterized in that Two ammonia Ceramic membrane internals (2-1) are arranged inside the filter (2).

Images