CN204438853U

CN204438853U - A kind of aqueous vapor from power plant sampling cooling system

Info

Publication number: CN204438853U
Application number: CN201420793644.6U
Authority: CN
Inventors: 解莉; 丁业; 李玉磊; 田晓锋
Original assignee: Hennan Electric Power Survey and Design Institute
Current assignee: Hennan Electric Power Survey and Design Institute
Priority date: 2014-12-16
Filing date: 2014-12-16
Publication date: 2015-07-01
Anticipated expiration: 2024-12-16

Abstract

A kind of aqueous vapor from power plant sampling cooling system, comprises sample water cooler, and described sample water cooler connects that sample water carrys out water pipe, sample water outlet pipe, demineralized water come water pipe and demineralized water outlet pipe, and described demineralized water outlet pipe connects condenser.The utility model is that thermal power generation unit water and steam sampling system provides a kind of new type of cooling, be exactly to change the cooling water source of whole demineralized waters as water and steam sampling system of water system, demineralized water after intensification is directly mended to condenser, and need not again through the cooling of recirculated water, effectively can avoid the waste of heat energy like this, minimizing quantity of circulating water and heat exchanger surface amass, and save initial outlay and operating cost simultaneously.

Description

A kind of aqueous vapor from power plant sampling cooling system

Technical field

The utility model relates to the cooling device of cogeneration, is specifically related to the improved system of the thermal power generation unit water and steam sampling type of cooling.

Background technology

In existing power plant chemistry water and steam sampling system, the water-cooled mode of sample generally has two kinds: one to be utilize demineralized water cooling device to cool, and two is utilize subsidiary engine enclosed demineralized water to cool.

First kind of way: first by demineralized water cooling device cooling sample water, the demineralized water after intensification is again with open type or closed-type circulating cooling water cooling; The second way: directly utilize subsidiary engine enclosed demineralized water to cool sample water, the enclosed demineralized water after intensification uses subsidiary engine circulating water again.Schematic diagram refers to accompanying drawing 1 and accompanying drawing 2.

With reference to the accompanying drawings 1: whole sample water cooling process comprises twice intensification, twice cooling, there is the situation of waste heat energy; And in running, there is the loss of demineralized water due to demineralized water cooling device, exert oneself will increase so change water system, the setting of demineralized water cooling device simultaneously makes complex system, causes cost of investment to increase, operating cost raising.

With reference to the accompanying drawings 2: whole sample water cooling process comprises twice intensification, twice cooling, and the increase of the subsidiary engine enclosed desalination water yield needed for sample water cooling, make the pump of subsidiary engine enclosed demineralized water cooling system, pipe diameter and heat exchanger surface are long-pending etc. all will increase thereupon, cause cost of investment to increase equally, operating cost improves.

Utility model content

High in order to solve cost of investment in above-mentioned two kinds of sample water cooling modes, operating cost is high, the problem of thermal waste, and the utility model provides a kind of aqueous vapor from power plant to sample cooling system.The utility model is that the whole demineralized waters utilizing chemical Boiler water Feeding System system to mend toward boiler cool sample water, and the demineralized water after intensification is mended to condenser again, so both effectively can avoid the waste of heat energy, can save initial outlay and operating cost again.

The purpose of this utility model is achieved through the following technical solutions:

A kind of aqueous vapor from power plant sampling cooling system, comprises sample water cooler, and described sample water cooler connects that sample water carrys out water pipe, sample water outlet pipe, demineralized water come water pipe and demineralized water outlet pipe, and described demineralized water outlet pipe connects condenser.

Described demineralized water carrys out water pipe and connects chemical Boiler water Feeding System system.

Here is feasibility analysis and Economic and Efficiency Analysis:

1, sample water cooling water water temperature requires≤38 DEG C, changes water system demineralized water and meets the demands (water temperature≤30 DEG C).

2, the calculating of the required demineralized water water yield:

Suppose that the temperature and pressure of every road sample water is the pressure and temperature of main steam, and unit parameter is with reference to extra-supercritical unit.

1. sample water comes coolant-temperature gage≤610 DEG C, pressure≤27.56MPa, specific enthalpy≤3500.34kJ/kg

2. 25 DEG C≤sample water leaving water temperature≤35 DEG C, 0.3MPa≤pressure≤0.5MPa,

105.11kJ/kg≤specific enthalpy≤147.09kJ/kg

③Mei road sample discharge≤2000ml/min, way≤15

4. ml/min × 1, tunnel × 2000, total enthalpy difference≤15 g/ml × (3500.34-105.11) kJ/kg=101856.9 kJ/ min of sample water water and water outlet

5. 20 DEG C≤demineralized water comes coolant-temperature gage≤30 DEG C, 0.35MPa≤pressure≤0.55MPa, 84.25 kJ/kg≤specific enthalpy≤126.24 kJ/kg

6. demineralized water leaving water temperature >=50 DEG C, pressure >=0.20 MPa, specific enthalpy >=209.5 kJ/kg

7. the required desalination water yield≤101856.9 kJ/ min ÷ (209.5-126.24) kJ/kg

=1223.4 kg/ min=73.4m3/h

Above-mentioned result of calculation is the maximum (actual value is certainly little) of the required demineralized water water yield under assumed condition.For general thermal power generation unit, the above-mentioned water yield can be provided.

To sum up, the utility model can extensive use.

3, Economic and Efficiency Analysis:

1. from schematic diagram, compared with existing two kinds of types of cooling, the utility model eliminates the temperature-fall period of the sample water cooling water after intensification, and the heat of sample water can be made thus not to be wasted, and can save again the quantity of circulating water needed for the sample water cooling water after heating up for cooling.

If equipment year, gas-to electricity hourage was 5500h, then kJ/ min × 60, heat≤101856.9 × 5500h=3.36 × 1010 kJ of sample water cooling release, be equivalent to generating standard coal consumption about 1100t fewer than a reference value, calculate by standard coal price 835 yuan/t, the whole year can save 920,000 yuan.

In summer, recirculated water comes coolant-temperature gage≤33 DEG C, pressure≤0.25MPa, specific enthalpy≤138.51kJ/kg; Recirculated water return water temperature >=40 DEG C, pressure >=0.10MPa, specific enthalpy >=167.62kJ/kg; The quantity of circulating water needed for sample water≤101856.9kJ/ min ÷ (167.62-138.51) kJ/kg=3499.03kg/ min=209.9m3/h after cooling heats up.Therefore the utility model can save quantity of circulating water 209.9m3/h.

2. for large and medium generator group, particularly thermal power plant unit, all boiler feedwater water yields generally much larger than sample water cooling institute water requirement, are used for cooling sample water by the boiler feedwater water yield, the heat exchange area of sample water cooler can be made like this to reduce, thus equipment investment is reduced.The unit that installed capacity is identical, heating load is larger, and boiler feedwater amount is larger, and sample water cooler heat exchange area reduces more, and equipment investment is less.

3. compared with sample water cooling mode one, the utility model also making water system is exerted oneself constant, thus the investment cost of savingization water system and operating cost, eliminate a whole set of demineralized water cooling device simultaneously, no matter be process equipment, floor space, or electrical control, civil engineering and construction etc. all save investment.In existing water and steam sampling system, the unit that general installed capacity is less than 300MW can arrange demineralized water cooling device, and for 2 × 135MW unit, its equipment investment is about 150,000 yuan, and floor space is about 20m2.

4., compared with sample water cooling mode two, the utility model also saves the part subsidiary engine enclosed desalination water yield, and a set of vapor sampling device can save the subsidiary engine enclosed demineralized water of about 40t/h.And due to the minimizing of the water yield, also can make the pump of subsidiary engine enclosed demineralized water cooling system, pipe diameter and heat exchanger surface is long-pending etc. all can reduce thereupon, thus reduce investment outlay expense and operating cost.

To sum up, the utility model be a kind of reduce investment outlay expense and operating cost, the type of cooling of avoiding thermal waste, economic benefit good.

Accompanying drawing explanation

Fig. 1 is the schematic diagram utilizing demineralized water cooling device to cool sample water;

Fig. 2 is the schematic diagram utilizing subsidiary engine enclosed demineralized water to cool sample water;

Fig. 3 is schematic diagram of the present utility model.

In figure 1, sample water carrys out water pipe, and 2, sample water outlet pipe, 3, sample water cooler, 4, demineralized water outlet pipe, 5, demineralized water carrys out water pipe, 6, demineralized water cooling device, 7, recirculated water carrys out water pipe, 8, recirculated water return pipe, 9, closed-up water return pipe, 10, other cooling device carrys out water pipe, 11, closed-up water feed pipe, 12, to other cooling device water pipe, 13, closed circulation-water cooling device, 14, condenser.

Detailed description of the invention

A kind of aqueous vapor from power plant sampling cooling system, comprises sample water cooler 3, and described sample water cooler 3 connects that sample water carrys out water pipe 1, sample water outlet pipe 2, demineralized water come water pipe 5 and demineralized water outlet pipe 4, and described demineralized water outlet pipe 4 connects condenser 14.Described demineralized water carrys out water pipe 5 and connects chemical Boiler water Feeding System system.

Whole demineralized waters that change homogeneous solution-type reactor make up water treatment system provides by the utility model are as the cooling water source of water and steam sampling system, demineralized water enters sample water cooler 3 and cools sample water, demineralized water after intensification flows into condenser 14 by demineralized water outlet pipe 4, without the need to the cooling again through recirculated water, effectively can avoid the waste of heat energy like this, minimizing quantity of circulating water and heat exchanger surface amass, and save initial outlay and operating cost simultaneously.

Need during concrete use to do following preparation:

1, according to machine set type and boiler factory's data, sample point and the sample point parameter of unit is determined.Then according to enthalpy balance, the desalination water yield needed for cooling sample water is calculated.

2, the demineralized water water yield of comparison water system and the desalination water yield needed for cooling sample water, determine feasibility.

3, based on enthalpy equilibrium principle, according to the demineralized water water yield, temperature, the pressure and other parameters of changing water system, unit sample water water and the sample water water outlet water yield, temperature, pressure and other parameters, calculate the parameter such as the heat exchange area of sample water cooler, cooling water pipe caliber.

The temperature of the demineralized water water outlet after 4, heating up according to enthalpy EQUILIBRIUM CALCULATION FOR PROCESS, to coordinate steam turbine profession about the calculating of condenser.

Claims

1. an aqueous vapor from power plant sampling cooling system, comprise sample water cooler (3), described sample water cooler (3) connects that sample water carrys out water pipe (1), sample water outlet pipe (2), demineralized water come water pipe (5) and demineralized water outlet pipe (4), it is characterized in that: described demineralized water outlet pipe (4) connection condenser (14).

2. a kind of aqueous vapor from power plant sampling cooling system according to claim 1, is characterized in that: described demineralized water carrys out water pipe (5) and connects chemical Boiler water Feeding System system.