Water treatment plant of combined heat and power plant

FIELD: heating.

SUBSTANCE: water treatment plant of a combined heat and power plant includes water pre-cleaning unit I, reverse osmosis unit II, ion exchange unit III for deep water demineralisation and a unit for obtaining chemically treated make-up water IV for a heat network. The first deaerator 8 is connected to high-pressure steam boiler 9. Water pre-cleaning unit I includes in-series connected clarifier 2, coagulated water tank 3, mechanical filter 4, as well as washing solution tank 20. Reverse osmosis unit II includes reverse osmosis plant 5. Ion exchange unit III for deep water demineralisation includes in-series connected filter 6 for H-ionisation and filter 7 for OH-ionisation, as well as neutralising tank 17. Unit IV for obtaining chemically treated make-up water for the heat network includes in-series connected tank 18 for chemically cleaned water and the second deaerator 25. Clarifier 2 is connected to FeCl3 solution tank 27 and to NaOH solution tank 28.

EFFECT: invention allows reducing consumption of reagents and salt content of chemically treated water, as well as simplifying a process flow diagram.

1 dwg, 1 tbl

 

The invention relates to the field of thermal and industrial power engineering and can be used to provide consumers with chemically purified and chemically demineralized water.

Known system of training of additional water systems for heat, contains consistently included the installation of pre-treatment of water with clarified water line, installation of ro water with the lines of the permeate and concentrate and dosing node in the clarified water antiscalant. The system further comprises a bypass in relation to the installation of ro water clarified water line connected to the permeate line and the node of decarbonization in the permeate line with line decarbonizing permeate. On line concentrate the installation of a reverse osmosis desalination placed electrodialysis unit (EDU) with bipolar membranes with the withdrawal line of acid solution in the permeate line to the node of decarbonization, the withdrawal line of the alkaline solution in the permeate line after the node of decarbonization and the withdrawal line diluate [1] - equivalent. The disadvantage of this system is the poor quality of chemically treated water, which this system may only be used for water treatment for heating systems (Stiffness permeate the DOE analogue of 0.06 mEq/l versus 0.004 mg-EQ/l net�adjoint of the invention). Another disadvantage of this system is the presence of discharge of salt water withdrawal line diluate from ED.

Known ion-exchange system chemical treatment and reverse osmosis desalination of water for boilers of thermal power plants, which contains a series-connected array of advanced water purification, water softening unit with line removal of excess regenerating solution filter cation exchange unit to reset, reverse osmosis with drain lines and concentrate and permeate. In addition, the system contains additional installation for the concentration of solutions and obtaining desalinated water by the method of thermal desalination to install evaporative lines concentrate and demineralized water [2] - analogue. The disadvantage of this system is the complexity of its technological scheme due to the presence of additional plants for the concentration of solutions and obtaining desalinated water by the method of thermal desalting on evaporative installation, resulting in increased space requirements, material requirements and therefore the overall system cost. Another disadvantage of this system is the discharge of saline effluent line drain highly mineralized waste regeneration solution filter cation exchange unit.

Known water treatment system additional water for �elovich electric power plants, containing series-connected array of advanced water purification, water softening unit, reverse osmosis unit, and a deaerator connected to a steam boiler of high pressure, and installation for preparation of chemically purified water. The water pretreatment unit comprises serially connected to the clarifier with the flow of source water and discharge of sludge coagulated water tank, mechanical filter with drain line water wash tank and the wash solution supply line flushing solutions to the clarifier, line discharging wash water mechanical filter connected to the tank of washing solutions, water softening unit comprises a series-connected filter cation exchange unit connected to the tank rinsing solutions through withdrawal line regeneration solution, and a tank with softened water line discharging softened water, reverse osmosis unit contains a reverse osmosis system with drain lines and concentrate and permeate, the withdrawal line of softened water is connected to the unit for preparation of chemically treated water, wherein it is additionally introduced block ion exchange for deep desalination of water containing series-connected N filter-and the filter working OH-working with the lines of the allotment regeneration water in buck Converter, and the line from�ode permeate of a reverse osmosis unit connected to the filter H-working, a buck Converter and discharge line of the concentrate of a reverse osmosis unit connected to the unit for preparation of chemically treated water [3] - prototype. The disadvantages of the prototype should include:

- high consumption of reagents Ca(OH)2; NaCl and technological complexity of the scheme, due to the presence of water softening unit with filter Na-cation exchange;

- relatively low purity of the chemically purified water (salinity - 740 g/t).

Impact and results of the invention are as follows:

- reduce the consumption amount of the reactants due to the exclusion of Ca(OH)2NaCl;

- simplification of the technological scheme due to the exclusion of the softening unit;

- increase purity by reducing salinity chemically purified water.

These results are achieved by the fact that the drinking water treatment installation of thermal power plant containing a block of water pretreatment, reverse osmosis unit, ion exchange unit for deep water desalination unit producing chemically treated water for heating system and the first deaerator connected with a steam boiler of high pressure, the water pretreatment unit comprises serially connected to the clarifier with the flow of source water and discharge of sludge coagulated water tank, mechanical filter with the drain line of the wash� water line and drain the clarified water, and tank rinsing solution supply line flushing solutions to the clarifier, line discharging wash water mechanical filter connected to the tank of the wash solution, the reverse osmosis unit contains a reverse osmosis system with drain lines and concentrate and permeate, the ion exchange unit for deep water desalination comprises a series-connected filter H-working and filter OH-working with the lines of the allotment regeneration water in buck Converter, a unit for production of chemically purified water for heating system comprises a series-connected tank chemically treated water and the second deaerator, the line of withdrawal of the clarified water with a mechanical filter connected to the tank chemically purified water, discharge line of the permeate of a reverse osmosis unit connected to the filter H-working, the line of flow of demineralized water from the filter OH-the working connected with the first deaerator tank neutralizer and discharge line of the concentrate of the reverse osmosis plant is connected to the tank chemically treated water, according to the invention were introduced into the solution tank FeCl3tank NaOH solution, connected to the clarifier, and the supply line of reagents for pH correction coagulated water, and the line of withdrawal of the clarified water with a mechanical filter connected to the reverse osmosis

The invention is illustrated by drawings, which shows the proposed water treatment unit of heat and power plant.

In the drawing have the following meaning:

I - preliminary treatment block,

II - unit reverse osmosis

III - block ion exchange,

IV - a unit for production of chemically purified water for heating systems,

1 - supply line of the source water,

2 - clarifier,

3 - coagulated water tank,

4 - mechanical filter,

5 - reverse osmosis,

6 - filter H-working (H-filter)

7 - filter IT-working (OH-filter)

8 - the first deaerator,

9 - steam boiler high pressure

10 - line discharging the clarified water with a mechanical filter,

11 - line discharging the concentrate from the reverse osmosis plant,

12 - line removal of permeate from the reverse osmosis plant,

13 - supply line of demineralized water with HE filter,

14 - conveying line deaerated water,

15 - line exhaust regeneration solutions with N-filter,

16 - line exhaust regeneration solutions with OH-filter,

17 - buck Converter,

18 - installation preparation of chemically purified water,

19 - line discharging flushing water from the mechanical filter,

20 - tank flushing solutions

21 - supply line flushing solutions to lighten�al,

22 - the line of discharge of sludge from the clarifier,

23 - supply line of reagents for pH correction coagulated water.

24 - supply line of chemicals for pH correction, chemically treated water,

25 - the second deaerator,

26 - supply line of chemically treated water to fuel heating systems (Hocv on title),

27 - buck solution of FeCl3,

28 - tank NaOH solution.

Water treatment installation of thermal power plant contains consistently included the pre-cleaning unit I water II unit reverse osmosis unit III ion exchange and the first deaerator 8, connected to a feed line 14 dearyou water, with a steam boiler 9 high pressure and unit IV preparation of chemically purified water for heating systems.

Unit I water pretreatment comprises serially connected to the clarifier 2 with lines 1 and 22 respectively of the feed water and discharge of sludge coagulated water tank 3, a mechanical filter 4 with line 10 of the clarified water outlet and the line 19 of the drain wash water in the tank 20 wash solution with line 21 flow of wash solution into the clarifier 2.

Unit II reverse osmosis system contains a 5 reverse osmosis with lines 11 and 12, respectively discharging the concentrate and permeate.

Unit III ion exchange for deep desalination of water contains consistently connected and�e filter 6 H-working and the filter 7 OH-working with the lines of the allotment regeneration water 15 and 16, in buck Converter 17. Line 12 removal of permeate installation 5 reverse osmosis system is connected to the filter 6 H-working.

Unit IV receiving chemically treated water for heating system comprises a series-connected tank 18 chemically treated water and the second deaerator 25.

Line 10 discharging the clarified water with a mechanical filter 4 is connected to the tank 18 chemically purified water.

Line removal of permeate of a reverse osmosis unit connected to the filter H-working.

Line 13 flow of demineralized water from the filter OH-the working connected with the first deaerator 8.

Buck Converter 17 and line 11 of the concentrate outlet installation 5 reverse osmosis system connected to the tank 18 chemically treated water

The proposed water treatment installation of thermal power plant is characterized in that it introduced the tank 27 solution of FeCl3tank 28 NaOH, United with the clarifier 2, line 23 of the reagent for pH correction coagulated water, line 10 discharging the clarified water with a mechanical filter connected with 5 reverse osmosis.

Thus, in comparison with the prototype water treatment unit is characterized in that in the clarifier serves 2 (metered) reagents FeCl3and NaOH, an input line 23 of the reagent for pH correction, proposed in�podgotovitelnoe installation is missing a water softening unit, and, accordingly, no waste regeneration effluent Na-cationite filters and feed (dosing) reagent NaCl.

Water treatment installation of thermal power plant works as follows.

The raw water line 1 is fed to the block I pre-cleaning, clarifier 2 of which are in the process of coagulation and softening due to the dosage of the reagents supplied from a tank 27 of a solution of FeCl3and tank 28 of NaOH, and subsequent clarification in the mechanical filter 4, which is installed after the coagulated water tank 3. Before serving coagulated water in a mechanical filter carry out pH adjustment, by filing reagents (acid) through the line 23. Clarified water after the filter 4 through line 10 is fed into the block II reverse osmosis. Further permeate with install 5 reverse osmosis on line 12 enters the block III ion exchange for deep water desalination in a filter 6 N-working and the filter 7 OH-working.

Then, on line 13 of demineralized water with filter 9 OH-the working enters the deaerator 8 with a further feed line 14 into the boiler 9 medium or high pressure. Regeneration water filter 6 H-working and filter 7 OH-working on the lines, respectively 15 and 16, are directed to the buck Converter 17.

Of clarified water with a mechanical filter 4 water� on line 10, concentrate with install 5 reverse osmosis on line 11, and regeneration water tank Converter 17 are served in tank 18 unit IV preparation of chemically treated water, for example, be used to fuel heating systems.

Wash water via line 19 with the filter 4, which is installed in the unit I pre-cleaning, is directed into the tank 20 of the wash solutions with further feed to the clarifier 2 via line 21. In the process clarifier 2 sludge is removed via line 22.

Material balance for the processing steps of the present invention water treatment plant heat and power plant at Kazan CHP-2 in January 2012 are shown in table 1.

Table 1
No.Q, t/hW0NaHCO3SO4ClThe ogonSiO2OKBBSSpH
Mr. EQ/t=mEq/lppm=mg/l
Source water in WWS2254,430,352,531,770,340,0029,798,83Of 1.82336,48,16
Clarified water after Matt2350,44,3811,770,640,275,440,128010,3
Permeate the DOETo 124.20,0040,220,20,020,20,010,10,40168,9
Con�Rath DOE 41,11,617,17,671,50,012216,0012409,1
Hocv96,60,88,60,113,50,90,02118,006109,2
Hove122,40A 0.00025000,000100,0001000,0017
MT - mechanical filter;
WWS - clarifier;
The DOE - installation �Vice versa osmosis;
Hocv - chemically treated water;
CWA - chemically demineralized water.

Thus, in comparison with the prototype, the use of this invention will reduce the amount of reagents CA(Oh)2, NaCl, to simplify the technological scheme and to enhance the purity by reducing salinity chemically treated water to 610 g/t, and to reduce the number of discharges of spent regeneration solutions.

Sources of information

1. Pat. No. 2322403 of the Russian Federation. The system of training of additional water systems for heat / I. A. Malakhov, A. A. Asgarnia, V. In Shishchenko, G. I. Malakhov. The invention of 2008. - No. 11.

2. Pat. No. 2322402. System ion exchange chemical treatment and reverse osmosis desalination of water for boilers of thermal power plants / I. A. Malakhov, A. A. Asgarnia, G. I. Malakhov. The invention of 2008. - No. 11.

3. Pat. No. 133526. Water treatment installation of thermal power plant / N. D. Chicherov, A. A. Chicherov, S. M. Vlasov. The utility model 2013. - No. 29.

Water treatment installation of thermal power plant containing a block of water pretreatment, reverse osmosis unit, ion exchange unit for deep water desalination unit producing chemically treated water for heating system and the first deaerator, with�United with a steam boiler of high pressure, the water pretreatment unit comprises serially connected to the clarifier with the flow of source water and discharge of sludge coagulated water tank, mechanical filter with line discharging wash water and the line of withdrawal of the clarified water, and tank washing solution supply line flushing solutions to the clarifier, line discharging wash water mechanical filter connected to the tank of the wash solution, the reverse osmosis unit contains a reverse osmosis system with drain lines and concentrate and permeate, the ion exchange unit for deep water desalination comprises a series-connected filter H-working and filter OH-working with the lines of the allotment regeneration water in buck Converter, a unit for production of chemically purified water for heating system comprises serially connected chemically purified water tank and a second vent, wherein the withdrawal line of clarified water with a mechanical filter connected to the tank chemically purified water, discharge line of the permeate of a reverse osmosis unit connected to the filter H-working, the line of flow of demineralized water from the filter OH-the working connected with the first deaerator, buck Converter and discharge line of the concentrate of the reverse osmosis plant is connected to the tank chemically treated water, wherein the�, that were introduced into the solution tank FeCl3tank NaOH solution, connected to the clarifier, and the supply line of reagents for pH correction coagulated water, and the line of withdrawal of the clarified water with a mechanical filter connected to the reverse osmosis unit.



 

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