CN219079275U - Coking surplus aqueous ammonia is with evaporating ammonia system - Google Patents

Abstract

The utility model relates to the technical field of chemical equipment, and discloses an ammonia distillation system for coking residual ammonia water, which comprises an ammonia distillation tower, a filtering unit and a PLC (programmable logic controller); the ammonia still is provided with a feeding pipe, the side wall of the ammonia still is provided with a light waste pipe, the light waste pipe is provided with a first valve, the bottom of the ammonia still is provided with a heavy waste pipe, the heavy waste pipe is provided with a second valve, the bottom of the ammonia still is provided with a density detector, and the density detector is electrically connected with the PLC; the filter unit comprises a clarifying tank for treating light wastewater, a settling tank for treating heavy wastewater and a flushing pipeline, wherein the feeding end of the clarifying tank is communicated with a light wastewater pipe, the discharging end of the clarifying tank is provided with a light wastewater pump, the discharging end of the light wastewater pump is communicated with a sewage tank through a pipeline, one end of the flushing pipeline is communicated with the discharging end of the light wastewater pump, the other end of the flushing pipeline is communicated with the heavy wastewater pipe, an electric valve is arranged on the flushing pipeline, and the electric valve is electrically connected with a PLC (programmable logic controller).

Description

Coking surplus aqueous ammonia is with evaporating ammonia system

Technical Field

The utility model relates to the technical field of chemical equipment, in particular to an ammonia distillation system for coking residual ammonia water.

Background

The coking industry belongs to the traditional industry, the main product is coke, the coke is high-quality fuel obtained by carbonization of coal at a high temperature of more than 1000 ℃, and the coke can be used as fuel for blast furnace smelting, nonferrous metal smelting, water gas manufacturing and the like; the coking wastewater mainly comes from residual ammonia water waste liquid generated by primary cooling of coke oven gas and cooling of raw coke oven gas, has complex water quality, various components and higher pollutant concentration, and contains elementary phenols, polyhydric phenols, oil substances and the like besides inorganic substances such as NH3, H2S, CO2 and the like. The common biochemical treatment is widely used in coking plants, and the common biochemical technology is difficult to treat ammonia and phenol in the coking wastewater, so that pollutants such as COD, BOD and the like at the coking wastewater treatment water outlet are difficult to reach standards.

In the prior art, the ammonia distillation process is widely applied, the ammonia distillation tower is an important device in the ammonia distillation process, the whole ammonia distillation process is used for reducing ammonia nitrogen of residual ammonia water, decomposing fixed ammonia in the ammonia water, separating tar and ammonia in the ammonia water, and ammonia can be used as an alkali source, thrown into a desulfurization working section, removing hydrogen sulfide in coal gas, filtering light wastewater and discharging the filtered light wastewater into a sewage pool for centralized treatment to form a circular economy system; meanwhile, heavy wastewater and light wastewater obtained after ammonia distillation treatment by an ammonia distillation tower have more tar impurities, which is very easy to cause massive deposition of sulfur and ammonium salt to block the ammonia distillation tower, so that frequent production halt and maintenance are caused, and the production efficiency is affected; meanwhile, because the viscosity of the tar is high, external steam is needed for purging, but the too high steam temperature can cause chemical reaction of the tar, so that the content of asphalt components in the tar is increased, and the tar becomes solid and easily blocks a heavy waste pipe.

Disclosure of Invention

The utility model aims to provide an ammonia distillation system for coking residual ammonia water, which aims to solve the technical problem that a heavy waste water pipe of an ammonia distillation tower is easy to block.

In order to solve the problems, the basic scheme provided by the utility model is as follows: an ammonia distillation system for coking residual ammonia water comprises an ammonia distillation tower, a filtering unit and a PLC controller; the ammonia still is provided with a feeding pipe, the side wall of the ammonia still is provided with a light waste pipe, the light waste pipe is provided with a first valve, the bottom of the ammonia still is provided with a heavy waste pipe, the heavy waste pipe is provided with a second valve, the bottom of the ammonia still is provided with a density detector, and the density detector is electrically connected with a PLC; the filter unit comprises a clarifying tank for treating light wastewater, a settling tank for treating heavy wastewater and a flushing pipeline, wherein the feeding end of the clarifying tank is communicated with a light wastewater pipe, the discharging end of the clarifying tank is provided with a light wastewater pump, the discharging end of the light wastewater pump is communicated with a sewage tank through a pipeline, one end of the flushing pipeline is communicated with the discharging end of the light wastewater pump, the other end of the flushing pipeline is communicated with the heavy wastewater pipe, and an electric valve is arranged on the flushing pipeline and is electrically connected with a PLC.

The utility model has the working principle and beneficial effects that: when the ammonia water pump is used, the ammonia water pump is started, the residual ammonia water is led into the ammonia distillation tower, the ammonia distillation tower is put into use, and the ammonia distillation tower is used for carrying out ammonia distillation treatment on the residual ammonia water; the light wastewater after ammonia distillation treatment is discharged to a clarifying tank through a light wastewater pipe, the light wastewater is subjected to physical precipitation through the clarifying tank, and the light wastewater precipitated by the clarifying tank is discharged to a wastewater tank by a light wastewater pump to wait for further treatment; the wastewater discharged from the bottom of the ammonia still flows into a precipitation tank from a heavy wastewater pipe, is physically clarified by the precipitation tank, and is discharged into a wastewater pool from a heavy wastewater pump to wait for further treatment; when the density of the wastewater is higher than a set value, the density detector transmits a signal into the PLC, the PLC sends a signal to start the electric valve, the precipitated light wastewater backflushes the heavy wastewater pipe, heavy components such as tar and the like are prevented from depositing to block the heavy wastewater pipe, the ammonia distillation light wastewater is utilized for backflushing, meanwhile, the softening temperature can be controlled, and the light wastewater is utilized for softening tar asphalt at the bottom of the ammonia distillation tower, so that pollution discharge is facilitated.

And a second scheme is a preferable scheme, wherein the feeding pipe is provided with an ammonia water pump. Starting an ammonia water pump, and providing power for the residual ammonia water by the ammonia water pump, so that the residual ammonia water is pumped into an ammonia distillation tower by the ammonia water pump.

In the third aspect, the second aspect is preferable, and the clarifying tank and the settling tank are both provided with manholes. In order to ensure the filtering effect in the continuous production process, the manhole is required to be opened periodically to clean the clarifying tank and the sedimentation tank.

And a fourth scheme is the optimization of the third scheme, and a heat exchanger is connected between the light wastewater pump and the wastewater tank. Through throwing the heat exchanger into use, reduce the temperature of light waste water by the heat exchanger to avoid light waste water directly to get into in the wastewater disposal basin, prevent that light waste water from getting into in the effluent disposal basin because of the high temperature, kill the bacterium in the effluent disposal basin because of light waste water temperature is too high, reduce the sewage activity in the effluent disposal basin, thereby influence next step and handle.

The fifth aspect is the preference of the fourth aspect, the free end of the heavy waste pipe is communicated with the settling tank, the discharge end of the settling tank is provided with a heavy waste water pump, and the discharge end of the heavy waste water pump is communicated with the sewage pool through a pipeline. And conveying the wastewater treated by the sedimentation tank to a sewage tank through a heavy wastewater pump to wait for the next treatment.

Drawings

The utility model is further illustrated by the following figures and examples.

FIG. 1 is a schematic diagram of an ammonia distillation system for coking residual ammonia water according to the present utility model.

In the figure: an ammonia still 101; a feed tube 102; ammonia pump 103; a lightweight waste 104; a first valve 105; heavy waste 106; a second valve 107; a density detector 108; a clarifier 201; a lightweight wastewater pump 202; a precipitation tank 203; a heavy wastewater pump 204; flushing line 205; an electric valve 206; a lagoon 207; a manhole 208; a heat exchanger 209.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Please refer to fig. 1: an ammonia distillation system for coking residual ammonia water comprises an ammonia distillation tower 101, a filtering unit and a PLC controller; the model of the PLC is S7-1500, the ammonia still 101 is provided with a feed pipe 102, the feed pipe 102 is provided with an ammonia water pump 103, the model of the ammonia water pump 103 is SUS316, the side wall of the ammonia still 101 is provided with a light waste water pipe 104, the light waste water pipe 104 is provided with a first valve 105, the bottom of the ammonia still 101 is provided with a heavy waste water pipe 106, the heavy waste water pipe 106 is provided with a second valve 107, the bottom of the ammonia still 101 is provided with a density detector 108, the model of the density detector 108 is ET-03L, and the density detector 108 is electrically connected with the PLC.

The filtering unit comprises a clarifying tank 201, a settling tank 203 and a flushing pipeline 205, wherein the feeding end of the clarifying tank 201 is communicated with the light wastewater pipe 104, the discharging end of the clarifying tank 201 is provided with a light wastewater pump 202, the discharging end of the light wastewater pump 202 is connected with a heat exchanger 209 through a pipeline, the model of the heat exchanger 209 is MBRO.5-60, and the discharging end of the heat exchanger 209 is communicated with a sewage tank 207 through a pipeline; the feeding end of the sedimentation tank 203 is communicated with the heavy wastewater pipe 106, the discharging end of the sedimentation tank 203 is provided with a heavy wastewater pump 204, and the discharging end of the heavy wastewater pump 204 is communicated with a sewage tank 207 through a pipeline and is positioned at the discharging end of a heat exchanger 209; manhole 208 is arranged on both the clarifying tank 201 and the sedimentation tank 203; one end of the flushing pipeline 205 is communicated with one end of the light waste pipe 104 far away from the heat exchanger 209, the other end of the flushing pipeline 205 is communicated with the heavy waste pipe 106, and an electric valve 206 is arranged on the flushing pipeline 205, and the model of the electric valve 206 is 900X-25P.

The implementation manner of this example is as follows: when the device is used, firstly, the ammonia water pump 103 is started, the ammonia water pump 103 is used for introducing residual ammonia water into the ammonia distillation tower 101, the ammonia distillation tower 101 is used for distilling the residual ammonia water, and heavy wastewater and light wastewater are respectively discharged out of the ammonia distillation tower 101 through different tower plates of the ammonia distillation tower 101; firstly, a first valve 105 is opened to discharge light wastewater in an ammonia distillation tower 101 from a light wastewater pipe 104 into a clarifying tank 201, the light wastewater is physically precipitated in the clarifying tank 201, so that the light wastewater in the clarifying tank 201 is precipitated to the bottom by gravity sedimentation, suspended matters with density higher than that of water in the light wastewater are precipitated to the bottom by gravity, then, a light wastewater pump 202 is started to discharge the light wastewater in the clarifying tank 201 into a heat exchanger 209, and the heat exchanger 209 is used to enable the light wastewater to be discharged into a sewage tank 207 for the next treatment after heat exchange of the heat exchanger 209; simultaneously, the second valve 107 is opened, the heavy wastewater in the ammonia still 101 is discharged into the sedimentation tank 203 through the heavy wastewater pipe 106, the heavy wastewater is physically precipitated in the sedimentation tank 203, the suspended matters in the sedimentation tank 203 are separated from water by gravity sedimentation, the suspended matters with the density higher than that of water in the heavy wastewater are precipitated to the bottom of the sedimentation tank 203 under the action of gravity, the suspended matters are cleaned regularly through the manhole 208, and the heavy wastewater pump 204 is started to discharge the wastewater in the sedimentation tank 203 into the sewage tank 207 for the next treatment.

Detecting the concentration of heavy wastewater at the bottom of the ammonia still 101 by a density detector 108, when the concentration of the heavy wastewater is higher than a set value, controlling a start-up electric valve 206 to open the flow of a flushing pipeline 205 by a PLC controller, and closing a second valve 107 on a heavy wastewater pipe 106, so that the light wastewater in a clarifying tank 201 backflushes the heavy wastewater pipe 106 at the bottom of the ammonia still 101, and backflushing the heavy wastewater pipe 106 by the light wastewater; when the concentration of the density detector 108 is lower than the set value, the electric valve 206 is controlled to be closed by the PLC controller, so that backwashing is stopped; when the clarifying tank 201 and the settling tank 203 are thrown for a long time, the manhole 208 is opened by an operator to clean the clarifying tank 201 and the settling tank 203 respectively, thereby ensuring the filtering effect.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top", "end", "one side", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Meanwhile, unless explicitly specified and limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and may be either fixedly connected, adjustably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It will be apparent that the foregoing is only one embodiment, and not all embodiments, of the present utility model. Other modifications and equivalents of the present utility model, based on the embodiments of the present utility model, will be apparent to those of ordinary skill in the art without departing from the spirit and scope of the present utility model, and are intended to be encompassed in the scope of the appended claims.

Claims (5)

1. An ammonia distillation system for coking residual ammonia water, which is characterized in that: comprises an ammonia distillation tower (101), a filtering unit and a PLC controller; the ammonia still is characterized in that a feed pipe (102) is arranged on the ammonia still (101), a light waste pipe (104) is arranged on the side wall of the ammonia still (101), a first valve (105) is arranged on the light waste pipe (104), a heavy waste pipe (106) is arranged at the bottom of the ammonia still (101), a second valve (107) is arranged on the heavy waste pipe (106), a density detector (108) is arranged at the bottom of the ammonia still (101), and the density detector (108) is electrically connected with a PLC; the filter unit comprises a clarifying tank (201) for treating light wastewater, a settling tank (203) for treating heavy wastewater and a flushing pipeline (205), wherein the feeding end of the clarifying tank (201) is communicated with a light wastewater pipe (104), the discharging end of the clarifying tank (201) is provided with a light wastewater pump (202), the discharging end of the light wastewater pump (202) is communicated with a sewage tank (207) through a pipeline, one end of the flushing pipeline (205) is communicated with the discharging end of the light wastewater pump (202), the other end of the flushing pipeline (205) is communicated with a heavy wastewater pipe (106), and an electric valve (206) is arranged on the flushing pipeline (205), and the electric valve (206) is electrically connected with a PLC.

2. An ammonia distillation system for coking residual ammonia water according to claim 1, wherein: an ammonia water pump (103) is arranged on the feeding pipe (102).

3. An ammonia distillation system for coking residual ammonia water according to claim 2, wherein: and manholes (208) are formed in the clarifying tank (201) and the sedimentation tank (203).

4. An ammonia distillation system for coking residual ammonia water according to claim 3, wherein: a heat exchanger (209) is connected between the light wastewater pump (202) and the sewage tank (207).

5. An ammonia distillation system for coking residual ammonia water according to claim 4, wherein: the free end of the heavy wastewater pipe (106) is communicated with the sedimentation tank (203), the discharge end of the sedimentation tank (203) is provided with a heavy wastewater pump (204), and the discharge end of the heavy wastewater pump (204) is communicated with the sewage tank (207) through a pipeline.

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