阅读说明：本技术 一种自然通风直接空冷系统 (Natural draft direct air cooling system ) 是由 江瀚 王永新 陆平 益平 于 2020-05-13 设计创作，主要内容包括：本发明涉及一种自然通风直接空冷系统,包括通风塔、凝结水收集装置和多层凝汽器组,多层凝汽器组沿通风塔塔体的高度方向自下而上并联设置且设置在通风塔塔体的下部,每层凝汽器组包括冷却三角和百叶窗,多个冷却三角并联设置,每个冷却三角包括管束组、凝结水联箱、抽气联箱、冷却三角进气联箱、支撑框架、冷却三角排水口、冷却三角抽气口和冷却三角进汽口,排汽支管与冷却三角进汽口连接,每层凝汽器组单独配置抽真空设备,冷却三角抽气口通过抽真空管与对应的抽真空设备连接,冷却三角排水口通过冷凝水管与凝结水收集装置连接。本发明节能环保,降低了厂用电,提高机组的有效发电量；各层凝汽器抽真空系统互不干扰,减小安全隐患。(The invention relates to a natural ventilation direct air cooling system which comprises a ventilation tower, a condensed water collecting device and a plurality of layers of condenser groups, wherein the plurality of layers of condenser groups are arranged in parallel from bottom to top along the height direction of the ventilation tower body and are arranged at the lower part of the ventilation tower body, each layer of condenser group comprises a cooling triangle and a shutter, a plurality of cooling triangles are arranged in parallel, each cooling triangle comprises a tube bundle group, a condensed water header, an air exhaust header, a cooling triangle air inlet header, a supporting frame, a cooling triangle water outlet, a cooling triangle air exhaust port and a cooling triangle air inlet, an exhaust branch pipe is connected with the cooling triangle air inlet, each layer of condenser group is independently provided with a vacuumizing device, the cooling triangle air exhaust port is connected with the corresponding vacuumizing device through a vacuum pipe, and the cooling triangle water outlet is connected with the condensed water collecting device through a condensed water pipe. The invention is energy-saving and environment-friendly, reduces the service power and improves the effective generating capacity of the unit; and the vacuumizing systems of the condensers on all layers are not interfered with each other, so that the potential safety hazard is reduced.)

1. A natural draft direct air cooling system which characterized in that: comprises a ventilating tower (3), a condensed water collecting device (2) and a multilayer condenser group (1), wherein the multilayer condenser group (1) is arranged in parallel from bottom to top along the height direction of the tower body of the ventilating tower (3) and is arranged at the lower part of the tower body of the ventilating tower (3), each layer of condenser group (1) comprises a cooling triangle (1.1) and a louver (1.2), a plurality of cooling triangles (1.1) are arranged in parallel, the louver (1.2) is correspondingly arranged at an air inlet of the cooling triangle (1.1), each cooling triangle comprises a pipe bundle group (1.1.4), a condensed water header (1.1.6), an air exhaust header (1.1.2), a cooling triangle air inlet header (1.1.1) and a supporting frame (1.1.5), a cooling triangle water outlet (1.1.7) is arranged on the condensed water header (1.1.6), a cooling triangle air exhaust opening (1.1.3) is arranged on the cooling triangle header (1.1.2), and a cooling triangle air inlet (1.8) is arranged on the cooling triangle air inlet (1.1.1.1.8), a plurality of steam exhaust branch pipes (1.3) are branched from the main steam exhaust pipeline (4), the steam exhaust branch pipes (1.3) are connected with a cooling triangle steam inlet (1.1.8), each layer of condenser group (1) is separately provided with a vacuumizing device (1.6), the cooling triangle steam outlet (1.1.8) is connected with the corresponding vacuumizing device (1.6) through a vacuumizing pipe (1.4), and a cooling triangle water outlet (1.1.7) is connected with a condensed water collecting device (2) through a condensed water pipe (1.5).

2. A natural draft direct air cooling system according to claim 1, wherein: the condenser group (1) is provided with two or more layers.

3. A natural draft direct air cooling system according to claim 1, wherein: the cooling triangle (1.1) is vertically arranged on the outer side of the lower part of the ventilating tower (3).

4. A natural draft direct air cooling system according to claim 1, wherein: every cooling triangle (1.1) is equipped with two tube bank groups, braced frame (1.1.5) are vertical triangular prism structure, and two tube bank groups set up two adjacent outside facades at braced frame (1.1.5).

Technical Field

The invention relates to a natural ventilation direct air cooling system which is mainly applied to exhaust steam of a low-pressure cylinder of a steam turbine of a thermal power plant or exhaust steam condensation of similar steam driving equipment.

Background

Compared with wet cooling technology, direct air cooling technology has obvious water saving advantage and is widely applied to thermal power plants in northern areas rich in coal and water.

At present, a domestic direct air cooling system generally adopts a mechanical ventilation mode to obtain cold air required by heat exchange, a large amount of electric energy (accounting for about 1.4 percent of the total generating capacity of a unit) is consumed in the operation process, and low noise generated in the operation of a large axial flow fan adopted by the mechanical ventilation causes damage to human health. In order to solve these problems, the concept of the natural ventilation direct air cooling system is applied, and the natural ventilation direct air cooling system is more and more emphasized by users due to the characteristics of low power consumption, low maintenance cost of the mobile equipment and the like.

Disclosure of Invention

The invention aims to overcome the defects and provide an energy-saving and noiseless natural ventilation direct air cooling system, thereby reducing the service power and improving the effective generating capacity of the unit.

The purpose of the invention is realized as follows:

a natural ventilation direct air cooling system comprises a ventilation tower, a condensed water collecting device and a multilayer condenser group, wherein the multilayer condenser group is arranged in parallel from bottom to top along the height direction of the ventilation tower body and is arranged at the lower part of the ventilation tower body, each layer of condenser group comprises a cooling triangle and a louver, a plurality of cooling triangles are arranged in parallel, the louver is correspondingly arranged at the air inlet of the cooling triangle, each cooling triangle comprises a pipe bundle group, a condensed water header, an air exhaust header, a cooling triangle air inlet header and a supporting frame, the condensed water header is provided with a cooling triangle water outlet, the air exhaust header is provided with a cooling triangle air outlet, the cooling triangle air inlet header is provided with a cooling triangle air inlet, a main exhaust pipeline is provided with a plurality of exhaust branch pipes, the exhaust branch pipes are connected with the cooling triangle air inlet, and each layer of condenser group is independently provided with a vacuumizing device, the cooling triangle exhaust port is connected with corresponding vacuum pumping equipment through a vacuum pumping pipe, and the cooling triangle water outlet is connected with a condensed water collecting device through a condensed water pipe.

Preferably, the condenser bank is provided with two or more layers.

Preferably, the cooling deltas are arranged vertically outside the lower part of the ventilation tower.

Preferably, each cooling triangle is provided with two tube bundle groups, the supporting frame is of a vertical triangular prism structure, and the two tube bundle groups are arranged on two adjacent outer side vertical faces of the supporting frame.

The invention has the beneficial effects that:

compared with the prior art, the invention has the following advantages:

1. the natural ventilation direct air cooling system adopts the multilayer arrangement of the condenser groups, and the steam sides of the condenser groups in each layer are arranged in parallel, so that each layer of pipe bundle can be selected with proper length, the total resistance of the steam sides is reduced, the temperature drop caused by pressure drop is reduced, the average condensation temperature of steam is raised, the heat exchange efficiency is improved, the running backpressure of a steam turbine is reduced, and the generating capacity of a unit is improved. Meanwhile, the arrangement quantity of the heat exchange tube bundles can be increased in the same plane occupied area, the heat exchange area is increased, the manufacturing cost is reduced, and the land is saved.

2. According to the natural ventilation direct air cooling system, the vacuum pumping pipelines of each layer of the multi-layer condenser group are independently arranged, namely the vacuum pumping systems of the condensers of all layers are not interfered with each other, so that the risk that non-condensable gas accumulates in certain cooling triangles due to unbalanced vacuum pumping resistance of the condensers of all layers when the vacuum pumping systems are shared is avoided, and hidden dangers are brought to freezing prevention in winter and the like.

3. The invention relates to a natural ventilation direct air cooling system.A condensed water pipeline of each layer of a plurality of layers of condenser groups independently enters a condensed water collecting device. Because in the ventilating tower direction of height, the multilayer condenser is arranged from high to low in order, can form certain resistance when the condensate water flows in each layer condensate water pipeline, and the resistance differentiates, get into condensate water collection device after each layer condensate water pipeline joins, because pressure is equal at the meeting point, liquid level height will be decided by the condensate water resistance of the layer condenser of the biggest condensate water resistance in the condensate water header in each layer condenser bank cooling triangle, it is generally that the condensate water resistance is the highest in the highest layer condenser bank, at this moment, the liquid level in the condenser bank condensate water header of lower floor will be very high, can be full of the condensate water header and even get into in the tube bank, can take place the condition of freezing when the low temperature in winter, bring the hidden danger for the operation. The condensate pipeline of each layer of the multi-layer condenser group independently enters the condensate collecting device, the volume of the condensate collecting device is large, potential safety hazards caused when the condensate pipeline of each layer gathers each other and then enters the condensate collecting device can be avoided, and the unit operation safety and reliability are guaranteed.

4. According to the natural ventilation direct air cooling system, a fan is omitted, the electric energy consumption is reduced in the operation, and a large amount of service power is saved; meanwhile, the noise pollution of the fan is eliminated, and the environment is protected.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an elevational view of the cooling delta of the present invention.

FIG. 3 is a top view of the cooling delta of the present invention.

Wherein: a condenser group 1; cooling the triangle 1.1; a cooling triangular air inlet header 1.1.1; an air extraction header 1.1.2; cooling the triangular extraction opening 1.1.3; a tube bundle group 1.1.4; a support frame 1.1.5; a condensate header 1.1.6; a cooling triangular water outlet 1.1.7; cooling the triangular steam inlet 1.1.8; 1.2 of a shutter; 1.3 of a steam exhaust branch pipe; a vacuum pumping pipe 1.4; a condensate pipe 1.5; vacuumizing equipment 1.6; a condensed water collecting device 2; a ventilation tower 3; a main exhaust conduit 4.

Detailed Description

Referring to fig. 1-3, the invention relates to a natural draft direct air cooling system, comprising a ventilation tower 3, a condensed water collecting device 2 and a multi-layer condenser group 1, wherein the multi-layer condenser group 1 is arranged in parallel from bottom to top along the height direction of the tower body of the ventilation tower 3 and is arranged at the lower part of the tower body of the ventilation tower 3, each layer of condenser group 1 comprises a cooling triangle 1.1 and a shutter 1.2, a plurality of cooling triangles 1.1 at each layer are arranged in parallel, the shutter 1.2 is correspondingly arranged at the air inlet of the cooling triangle 1.1, each cooling triangle 1.1 comprises a tube bundle group 1.1.4, a condensed water header 1.1.6, an air exhaust header 1.1.2, a cooling triangle air inlet header 1.1.1.1 and a support frame 1.5, the cooling triangle air inlet header 1.1.6 is provided with a cooling triangle 1.1.7, an air exhaust header 1.2 is provided with a cooling triangle air exhaust port 1.3, the cooling triangle air inlet header 1.1.1.1.1.1.1.6 is provided with a cooling triangle steam inlet branch pipe and a plurality of branch pipes 3, the exhaust branch pipe 1.3 is connected with the cooling triangle steam inlet 1.1.8, and every layer of condenser group 1 disposes evacuation equipment 1.6 alone, and every layer of condenser group evacuation pipeline of multilayer condenser group adopts the independent arrangement scheme, and each layer of condenser evacuation system mutual noninterference avoids when sharing the evacuation system because the uneven risk that arouses non-condensable gas in some cooling triangles of each layer of condenser evacuation resistance, brings the hidden danger for preventing frostbite etc. in winter. The cooling triangle air exhaust port 1.1.8 is connected with corresponding vacuum pumping equipment 1.6 through a vacuum pumping pipe 1.4, and the cooling triangle water exhaust port 1.1.7 is connected with the condensed water collecting device 2 through a condensed water pipe 1.5.

The condenser group 1 is provided with two or more layers to form two layers of condenser groups. The steam condenser is arranged in multiple layers, and the steam sides of the steam condenser groups in all layers are arranged in parallel, so that each layer of pipe bundle can be selected with proper length, the total resistance of the steam sides is reduced, the temperature drop caused by pressure drop is reduced, the average condensation temperature of steam is raised, the heat exchange efficiency is improved, the running backpressure of a steam turbine is reduced, and the generating capacity of the unit is improved. Meanwhile, the arrangement quantity of the heat exchange tube bundles can be increased in the same plane occupied area, the heat exchange area is increased, the manufacturing cost is reduced, and the land is saved.

The cooling deltas 1.1 are arranged vertically outside the lower part of the ventilation tower 3. The plurality of cooling deltas of each layer are arranged in the circumferential direction of the lower portion of the ventilation tower 3.

Each cooling triangle 1.1 is provided with two pipe bundle groups, the supporting frame 1.1.5 is of a vertical triangular column structure, the supporting frame 1.1.5 is provided with three outer side vertical faces, the two pipe bundle groups are arranged on two adjacent outer side vertical faces of the supporting frame 1.1.5, and the two adjacent outer side vertical faces are side vertical faces close to the ventilation tower; the other side elevation is the side elevation far away from the ventilation tower, and the shutter 1.2 is arranged on the outer side of the side elevation. Air enters the tube bundle groups on the other two side vertical surfaces after entering from the side vertical surface far away from the ventilation tower, and the shutter 1.2 is used for adjusting the air flow entering the tube bundle groups and preventing the freezing accident of the cooling triangle 1.1 at low temperature.

The tower body of the ventilation tower 3 can adopt a concrete structure and can also adopt a steel structure.

Steam enters each steam exhaust branch pipe 1.3 from the main steam exhaust pipeline 4 and then enters the cooling triangle; outside cold air gets into from the lower part of ventilation tower 4, and under the natural draft effect that ventilation tower 4 produced, cold air rethread cooling triangle 1.1, and after the heat exchange with the steam in the cooling triangle, the steam condenses into behind the water by condensate pipe 1.6 and is collected by condensate water collection device 2, and the air in ventilation tower 3 rises the height through the cooling triangle temperature and becomes hot-air after, finally is discharged by 3 upper portion exports of ventilation tower.

Because in the ventilating tower direction of height, the multilayer condenser is arranged from high to low in order, can form certain resistance when the condensate water flows in each layer condensate water pipeline, and the resistance differentiates, get into condensate water collection device after each layer condensate water pipeline joins, because pressure is equal at the meeting point, liquid level height will be decided by the condensate water resistance of the layer condenser of the biggest condensate water resistance in the condensate water header in each layer condenser bank cooling triangle, it is generally that the condensate water resistance is the highest in the highest layer condenser bank, at this moment, the liquid level in the condenser bank condensate water header of lower floor will be very high, can be full of the condensate water header and even get into in the tube bank, can take place the condition of freezing when the low temperature in winter, bring the hidden danger for the operation. Because the parallelly connected setting of multilayer condenser group, the condensation water pipeline of every layer condenser group of multilayer condenser group gets into the condensate water collection device alone, and the condensate water collection device volume is great, can avoid each layer condensation water pipeline to gather each other and then get into the potential safety hazard when condensate water collection device, guarantees unit operation safe and reliable.

A fan is omitted, so that the electric energy consumption is reduced in the operation, and a large amount of auxiliary power is saved; meanwhile, the noise pollution of the fan is eliminated, and the environment is protected.

In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.