Deacidification and condensation integrated tower for ammonia distillation of wastewater

Abstract

The utility model belongs to the field of ammonia distillation of wastewater, and particularly relates to a deacidification and condensation integrated tower for ammonia distillation of wastewater, which comprises an ammonia distillation tower, a dephlegmator and a deacidification device, a rectifying section and a stripping section are arranged in the ammonia still; a dephlegmator is arranged at the top of the ammonia still; the deacidification device is arranged at the upper part of the rectifying section of the ammonia still and the lower part of the dephlegmator; the ammonia water inlet is formed in the deacidification device; the first acid gas outlet is formed in the deacidification device; the gas-liquid separator is connected with the first acid gas outlet; the second acid gas outlet is formed in the gas-liquid separator; the condensate outlet is formed in the gas-liquid separator; according to the ammonia still deacidification device, the traditional ammonia still process mode is changed, the deacidification device is arranged at the lower part of the dephlegmator of the ammonia still and the upper part of the rectifying section, and the process of the ammonia still deacidification device is optimized, so that the ammonia still deacidification device is compact in structure, low in operation cost, more reasonable in flow and simple to operate; and good benefits are brought to environmental protection, energy conservation and emission reduction.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater ammonia distillation technical field especially relates to a kind of deacidification condensing integrated tower for wastewater ammonia distillation. BACKGROUND

[0002] A large amount of wastewater (remaining ammonia water) is generated in coking process, which contains a large amount of volatile phenol, COD, sulfur dioxide, hydrogen sulfide, hydrogen cyanide, hydrogen chloride, carbon dioxide and other acidic gases, as well as high-concentration ammonia nitrogen and many difficult-to-degrade aromatic hydrocarbon compounds. Treating these wastewater has been a difficult problem for coking industry, which requires large investment, time, effort and operating cost, and causes great environmental pollution.

[0003] The earliest treatment of coking residual ammonia water is steam direct heating stripping, and now the wastewater is heated by heating unit or equipment and then sent to ammonia distillation tower (indirect ammonia distillation) for distillation, so as to remove the ammonia-containing elements in wastewater and release the ammonia dissolved in wastewater through heat transfer of heat carrier. The ammonia gas mixture discharged from the top of the tower is sent to saturator to produce ammonium sulfate, or to coal gas desulfurization section as desulfurizer or to produce 18-20% concentrated ammonia water for SCR desulfurization catalyst of coke oven flue gas, and the acidic substances in wastewater are removed to increase the PH value for producing high-concentration ammonia water.

[0004] There are three forms of wastewater ammonia distillation for producing concentrated ammonia water at present.

[0005] 1) Direct steam ammonia removal for producing ammonia water, which is the earliest and most common production process; the disadvantages are: not energy-saving, large steam consumption, low ammonia water concentration, and unable to meet the requirements of flue gas desulfurization and denitration.

[0006] 2) Increase deacidification equipment: add a deacidification tower on one side of the ammonia distillation tower, and the ammonia-rich water from the ammonia water tank is first sent to the deacidification tower to remove acidic gases and then sent to the ammonia distillation tower for ammonia removal; the disadvantages are: large one-time investment, increase of equipment, process pipeline, valve and instrument, large operation difficulty and high operating cost.

[0007] 3) The current ammonia distillation and deacidification process is: install a deacidifier on the top of the ammonia distillation tower, remove the original tower top ammonia separator and place it in the frame, and condense and cool the ammonia gas collected from the side line; the disadvantages are: large one-time investment, increase of frame height and reinforcement, increase of equipment, process pipeline, valve and instrument, large operation difficulty, and the ammonia gas collected from the side line is condensed and cooled and then reflows into the tower, which reduces the temperature in the tower, increases the steam consumption and increases the operating cost and operation difficulty.

[0008] Therefore, we propose a deacidification condensing integrated tower for wastewater ammonia distillation to solve the above problems. UTILITY MODEL CONTENT

[0009] The utility model discloses a deacidification and condensation integrated tower for ammonia evaporation of waste water.

[0010] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0011] A deacidification and condensation integrated tower for ammonia evaporation of waste water, comprising:

[0012] An ammonia evaporation tower, a deacidifier and a partial condenser; the ammonia evaporation tower is provided with a rectifying section and a stripping section; the top of the ammonia evaporation tower is provided with the partial condenser; the deacidifier is placed on the upper part of the rectifying section and the lower part of the partial condenser of the ammonia evaporation tower;

[0013] An ammonia water inlet is arranged on the deacidifier;

[0014] A first acid gas outlet is arranged on the deacidifier;

[0015] A gas-liquid separator is connected with the first acid gas outlet;

[0016] A second acid gas outlet is arranged on the gas-liquid separator;

[0017] A condensate outlet is arranged on the gas-liquid separator;

[0018] A first communication pipe is connected with the condensate outlet and the rectifying section respectively;

[0019] An ammonia-containing waste water outlet is arranged on the deacidifier;

[0020] A second communication pipe is connected with the ammonia-containing waste water outlet and the stripping section respectively;

[0021] A communication reflux pipe is arranged between the rectifying section and the deacidifier;

[0022] The partial condenser is arranged on the deacidifier and connected with the rectifying section through the communication reflux pipe;

[0023] An ammonia gas outlet is arranged on the partial condenser.

[0024] Preferably, the deacidifier comprises a feed distributor, a communication pipe and a filler.

[0025] Preferably, the deacidifier is provided with a communication reflux pipe, which is connected with the rectifying section and the partial condenser.

[0026] Preferably, the ammonia gas outlet is connected with a condensing cooler.

[0027] Preferably, a condensate tray is arranged between the rectifying section and the deacidifier.

[0028] Preferably, the acid gas outlet is connected with the gas-liquid separator, and the condensate outlet is connected with the rectifying section.

[0029] The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0030] 1. The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0031] 2. The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0032] 3. The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0033] 4. The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0034] The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0036] In the figure: 1, acid-removing device; 2, ammonia water inlet; 3, distributor; 4, filler; 5, first acid gas outlet; 6, gas-liquid separator; 7, second acid gas outlet; 8, condensate outlet; 9, first communication pipe; 10, rectifying section; 11, ammonia-containing wastewater outlet; 12, second communication pipe; 13, stripping section; 14, communication reflux pipe; 15, partial condenser; 16, ammonia gas outlet; 17, liquid breaking disc. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. EMBODIMENT

[0038] Referring to Figure 1 The acid-removing and condensing integrated tower for wastewater ammonia distillation has the advantages that:

[0039] An ammonia distillation tower and a deacidifier 1; the ammonia distillation tower is provided with a rectification section 10 and a stripping section 13; and the top of the ammonia distillation tower is provided with a demister 15; the deacidifier 1 is placed above the rectification section 10 and below the demister 15 of the ammonia distillation tower;

[0040] An ammonia water inlet 2 is arranged on the deacidifier 1;

[0041] A first acid gas outlet 5 is arranged on the deacidifier 1;

[0042] A gas-liquid separator 6 is connected with the first acid gas outlet 5;

[0043] A second acid gas outlet 7 is arranged on the gas-liquid separator 6;

[0044] A condensate outlet 8 is arranged on the gas-liquid separator 6;

[0045] A first communication pipe 9 is connected with the condensate outlet 8 and the rectification section 10 respectively;

[0046] An ammonia-containing wastewater outlet 11 is arranged on the deacidifier 1;

[0047] A second communication pipe 12 is connected with the ammonia-containing wastewater outlet 11 and the stripping section 13 respectively;

[0048] A communication reflux pipe 14 is arranged in the center of the deacidifier 1 and located between the rectification section 10 and the demister 15;

[0049] The demister 15 is arranged on the deacidifier 1 and connected with the communication reflux pipe 14;

[0050] An ammonia gas outlet 16 is arranged on the demister.

[0051] In this embodiment, the deacidifier 1 comprises a feed distributor 3, a communication reflux pipe 14 and a filler 4.

[0052] In this embodiment, the first communication pipe 9 is connected with a reflux pipe, and the reflux pipe is connected with the rectification section 10.

[0053] In this embodiment, the ammonia gas outlet 16 is connected with a condensation cooler.

[0054] In this embodiment, a liquid breaking disc 17 is arranged between the rectification section 10 and the deacidifier 1.

[0055] The utility model discloses a new process equipment is placed in the rectification section 10 of ammonia still of deacidifier 1 upper portion and ammonia subcondenser 15 lower portion, the residual ammonia water of coke oven comes after heat exchange by ammonia water pump and is sent into the deacidifier 1 of ammonia still upper portion, and the acid gas of separation is separated by gas-liquid separator 6, and the acid gas enters coking VOCs system, enters ammonium sulfate saturator or enters the gas system before air blower, and the ammonia separation liquid containing ammonia is returned to the rectification section 10, and the rich liquid ammonia water after deacidification is directly entered into the distillation section 13 tray of ammonia still by the outside connecting pipeline of tower, and the ammonia gas of ascending enters into ammonia subcondenser 15 condensation by the tray of rectification section 10, the center communication reflux pipe 14 of deacidifier 1, and the ammonia gas is discharged from the top of subcondenser 15 and produces concentrated ammonia water after cooling, a large amount of high-temperature ammonia-containing condensate is directly entered into the rectification section 10 by the center communication reflux pipe 14 of deacidifier 1, forms internal reflux, realizes the secondary utilization of waste heat, reduces the heat loss to the minimum, reduces the use amount of tower bottom steam, and the high-temperature condensate naturally returns without external power, which reduces the investment cost and operating cost, and the increase of deacidifier 1 can reduce the alkali of decomposed fixed ammonia salt.

[0056] Process flow: the residual ammonia water of drum cooling comes and the hot lean liquid discharged from ammonia still is heat exchanged (86-90 DEG C) and then is sprayed on the filler 4 by the rich liquid pump through the ammonia water inlet 2 on the deacidifier 1, is uniformly contacted with the filler 4, releases saturated gas acid gas, and the ascending acid gas is discharged from the first acid gas outlet 5, enters the gas-liquid separator 6, and the separated acid gas is discharged from the second acid gas outlet 7, enters the subsequent section treatment, and the condensate after separation is directly entered into the reflux pipe of ammonia still rectification section 10 or ammonia tank through the first communication pipe 9; the ammonia-rich liquid after deacidification flows out from the deacidifier ammonia-containing waste water outlet 11, enters the tray of the distillation section 13 of ammonia still and the ascending steam after adding or reducing through the second communication pipe 12, and is fully contacted with the ammonia nitrogen in the rich liquid to distill out; the ammonia gas of ascending enters into the subcondenser 15 through the communication reflux pipe 14 between the rectification section 10 of ammonia still and the deacidifier 1, is indirectly cooled by low-temperature water, the high-concentration ammonia gas flows out from the ammonia gas outlet 16, enters the condensing cooler to produce more than 20% concentrated ammonia water, and a large amount of high-temperature hot liquid produced after condensation of subcondenser 15 directly enters the tray of rectification section 10 through the communication reflux pipe 14 between the deacidifier 1, realizes the process flow of the equipment of ammonia still, deacidification and condensation integrated tower producing concentrated ammonia water.

[0057] The above is only the preferred specific implementation mode of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and the utility model concept of the utility model, is equivalent to replace or change, should be covered in the protection scope of the utility model.

Claims

1. A deacidification and condensation integrated tower for ammonia stripping in wastewater, characterized in that, The application relates to an ammonia stripping tower and a deacidifier (1), wherein a rectifying section (10) and a stripping section (13) are arranged in the ammonia stripping tower, a distributor (15) is arranged at the top of the ammonia stripping tower, the deacidifier (1) is arranged above the rectifying section (10) and below the distributor (15) of the ammonia stripping tower. An ammonia water inlet (2) is arranged on the deacidifier (1). A first acid gas outlet (5) is arranged on the deacidifier (1). A gas-liquid separator (6) is connected with the first acid gas outlet (5). A second acid gas outlet (7) is arranged on the gas-liquid separator (6). A condensed liquid outlet (8) is arranged on the gas-liquid separator (6). A first communication pipe (9) is connected with the condensed liquid outlet (8) and the rectifying section (10) respectively. An ammonia-containing wastewater outlet (11) is arranged on the deacidifier (1). A second communication pipe (12) is connected with the ammonia-containing wastewater outlet (11) and the stripping section (13) respectively. A communication reflux pipe (14) is arranged between the rectifying section (10) and the deacidifier (1) and is communicated with the distributor (15). An ammonia gas outlet (16) is arranged on the distributor (15). The deacidifier (1) comprises a feed distributor (3), the communication reflux pipe (14) and a filler (4).

2. The deacidification and condensation integrated column for ammonia distillation from wastewater according to claim 1, characterized in that, The first communication pipe (9) is connected with a reflux pipe, and the reflux pipe is connected with the rectifying section (10).

3. The deacidification and condensation integrated column for ammonia distillation from wastewater according to claim 1, characterized in that, The ammonia gas outlet (16) is connected with a condensing cooler.

4. The deacidification and condensation integrated column for ammonia distillation from wastewater according to claim 1, characterized in that, A condensed liquid tray (17) is arranged between the rectifying section (10) and the deacidifier (1).

5. The deacidification and condensation integrated column for ammonia distillation from wastewater according to claim 1, characterized in that, The acid gas outlet (5) is connected with the gas-liquid separator (6), and the condensed liquid outlet (8) is connected with the rectifying section (10).

6. The deacidification and condensation integrated column for ammonia distillation from wastewater according to claim 1, characterized in that, ​

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