Water replenishing and deoxidizing structure and steam exhaust device of steam turbine

Abstract

The utility model relates to the technical field of steam turbines, and discloses a steam turbine water replenishing and deoxidizing structure which comprises a water replenishing main pipe fixedly installed on a shell of a steam exhaust device and a plurality of sets of first atomizing nozzles installed on the water replenishing main pipe. A partition plate is fixed in the shell, and the shell can be divided into a first cavity and a second cavity through the partition plate. According to the water supplementing and oxygen removing structure of the steam turbine, after first-time heating and oxygen removing are conducted, the content of dissolved oxygen in feed water is greatly reduced, but residual oxygen possibly exists, through secondary heating and oxygen removing, the residual oxygen can be further removed through additional heat, the oxygen removing efficiency of the feed water is improved, and the water supplementing and oxygen removing efficiency of the steam turbine is improved. The water supply quality is ensured to reach a higher standard, the dissolved oxygen content in the water supply is further reduced, the oxygen corrosion and scaling phenomena of metal equipment in a thermodynamic system can be reduced, the service life of the equipment is prolonged, and the frequency and cost for maintaining and replacing the equipment are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine technical field, concretely is a steam turbine water supplementing and deaerating structure and exhaust device. BACKGROUND

[0002] Steam turbine circulating water system refers to the system for providing circulating cooling water for steam turbine, which is composed of circulating water pump, cooler, expansion tank, pressure reducer, blowdown device and other components. The main function of steam turbine circulating water system is to recycle the cooling water discharged from steam turbine, ensuring normal operation of steam turbine;

[0003] The existing water supplement of direct air-cooled steam turbine exhaust device is generally sprayed into the interior of the exhaust device by a series of small atomizing nozzles arranged on one or several water supplement mother pipes. When the water supplement passes through the atomizing nozzles, it is atomized into very small droplets. Then, the oxygen dissolved in the droplets is released by heating the droplets with the exhaust steam of the steam turbine, realizing the deoxygenation process of water supplement, or deoxygenation operation is performed by chemical method, mainly adding chemical reagent for deoxygenation (the chemical reagent can resonate with oxygen), and then generating a product (the oxidation of the product is smaller). The commonly used chemical reagent is usually sodium sulfite, steel chips and hydrazine. The deoxygenation method by adding chemical reagent can reach the standard of water quality;

[0004] According to the search, the utility model discloses a steam turbine water supplementing and deaerating structure, and the technical scheme disclosed in this technology includes a water supplement mother pipe installed in the shell of the exhaust device and an elastic atomizing nozzle installed on the water supplement mother pipe. The elastic atomizing nozzle can adjust the size of the flow passage diameter of the elastic atomizing nozzle according to the size of the water pressure in the water supplement mother pipe. When the water flow in the water supplement mother pipe decreases, the flow passage diameter of the elastic atomizing nozzle becomes smaller, thereby maintaining good atomization effect of the sprayed atomized droplets and ensuring that the exhaust device can maintain good atomization and deoxygenation effect when the water supplement changes.

[0005] The above design can continuously adjust the water flow in the water supplement mother pipe in real time by the flow passage diameter of the elastic atomizing nozzle. However, after the first heating and deoxygenation, the dissolved oxygen content in the feedwater has been greatly reduced, but there may still be residual oxygen, which can also cause oxidation corrosion, concave or perforation phenomenon in the feedwater system, which is not conducive to the smooth operation of the system. In severe cases, it will cause deposition and scaling in the heating surface of the equipment and the internal system of the steam turbine, affecting the use of the equipment. Therefore, we propose a steam turbine water supplementing and deaerating structure and exhaust device to solve the above problems. Utility model content

[0006] The steam turbine water replenishing and deoxidizing structure and the steam exhaust device solve the problem that after the first heating and deoxidizing, the dissolved oxygen content in the feed water has been greatly reduced, but there may still be residual oxygen, which can also cause oxidation corrosion, the system of the feed water to show a pit or perforation phenomenon, is not conducive to the smooth operation of the system, and in severe cases, will cause the heating surface of the equipment and the internal system of the steam turbine to produce deposition and scaling phenomena, affecting the use of the equipment.

[0007] To achieve the above object, the utility model discloses a steam turbine water replenishing and deoxidizing structure through the following technical scheme:

[0008] The inside of the shell is fixed with a partition, which can divide the shell into chamber one and chamber two;

[0009] One end of the conveying pipe two is fixedly connected with a conveying pipe three with a closed structure at both ends, and the surface of the conveying pipe three is fixedly connected with a plurality of atomizing nozzles two through a connecting pipe.

[0010] The conveying pipe two is fixedly connected with a conveying pipe three with a closed structure at both ends, and the surface of the conveying pipe three is fixedly connected with a plurality of atomizing nozzles two through a connecting pipe.

[0011] Preferably, part of the water replenishing main pipe and the atomizing nozzle one are located in the chamber one of the shell, and one end of the conveying pipe one extends into the chamber one of the shell and is fixedly connected with the shell.

[0012] Preferably, one end of the conveying pipe three extends into the chamber two of the shell and is fixedly connected with the shell.

[0013] Preferably, an inclined plate is arranged in the chamber one, the inclined plate is fixedly connected with the shell, and the inclined plate is designed to be inclined to one end of the conveying pipe one.

[0014] Preferably, a flow sensor is fixedly installed at the output end of the pump body, an automatic regulating valve is fixedly installed on the connecting pipe of the conveying pipe three, and a controller is fixedly installed on one side of the shell.

[0015] The utility model also proposes a steam exhaust device, which comprises a shell with an inlet end, an outlet end and a steam exhaust device, and a steam turbine water replenishing and deoxidizing structure as described above.

[0016] Preferably, the inlet end is arranged at the top of the shell, the outlet end is arranged on the side wall of the shell, the inlet end is composed of two groups of ports one, and the two groups of ports one are respectively communicated with the chamber one and the chamber two, the outlet end is composed of two groups of ports two, and the two groups of ports two are respectively communicated with the chamber one and the chamber two.

[0017] Preferably, the both sides of the partition plate are fixed with flow guide plates, and the surfaces of the flow guide plates are provided with water flow holes.

[0018] Preferably, the one end of the outlet end is fixedly provided with a condenser main body.

[0019] Preferably, the shell is provided with a conveying device at the position of the second chamber through a connecting pipe.

[0020] Advantages

[0021] The steam turbine water replenishing and deoxidizing structure and the steam exhaust device have the following advantages compared with the prior art:

[0022] The steam turbine water replenishing and deoxidizing structure, after the first heating and deoxidizing, the dissolved oxygen content in the feed water has been greatly reduced, but there may still be residual oxygen, and through the second heating and deoxidizing, the residual oxygen can be further removed by using additional heat, the deoxidizing efficiency of the feed water is improved, the feed water quality reaches a higher standard, the dissolved oxygen content in the feed water is further reduced, the oxygen corrosion and scaling phenomenon of the metal equipment in the thermal system are reduced, the service life of the equipment is prolonged, and the frequency and cost of maintenance and replacement of the equipment are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole structure schematic view of the utility model;

[0024] Figure 2 It is a whole structure side view of the utility model;

[0025] Figure 3 It is a shell structure sectional view of the utility model;

[0026] Figure 4 It is a local shell structure sectional view of the utility model.

[0027] In the drawing: 101, shell; 102, inlet end; 103, outlet end; 104, condenser main body; 105, conveying device; 106, water replenishing main pipe; 107, atomizing nozzle one; 108, partition plate; 109, flow guide plate; 110, inclined plate; 111, conveying pipe one; 112, pump body; 113, flow sensor; 114, conveying pipe two; 115, conveying pipe three; 116, controller; 117, automatic regulating valve; 118, atomizing nozzle two. DETAILED DESCRIPTION

[0028] Clearly, the described embodiments are merely part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0029] As Figures 1-4 Indicated:

[0030] A steam turbine water replenishing and deoxidizing structure, comprising a water replenishing main pipe 106 fixedly installed on the casing 101 of the exhaust device and a plurality of groups of atomizing spray heads I 107 installed on the water replenishing main pipe 106;

[0031] The inside of the casing 101 is fixed with a partition plate 108, and the casing 101 can be divided into chamber I and chamber II through the partition plate 108;

[0032] The pump body 112 is fixedly installed on one side of the casing 101 through a support plate, the input end of the pump body 112 is fixedly communicated with a conveying pipe I 111, and the output end of the pump body 112 is fixedly communicated with a conveying pipe II 114;

[0033] One end of the conveying pipe II 114 is fixedly communicated with a conveying pipe III 115 with a closed structure at both ends, and the surface of the conveying pipe III 115 is fixedly communicated with a plurality of groups of atomizing spray heads II 118 through a connecting pipe;

[0034] Part of the water replenishing main pipe 106 and the atomizing spray head I 107 are located in the chamber I of the casing 101, one end of the conveying pipe I 111 extends into the chamber I of the casing 101 and is fixedly connected with the casing 101;

[0035] One end of the conveying pipe III 115 extends into the chamber II of the casing 101 and is fixedly connected with the casing 101.

[0036] In the embodiment: the steam turbine water replenishing and deoxidizing structure, when in use, the exhaust enters into the chamber I and the chamber II of the casing 101 through the opening I of the inlet end 102 respectively, at the same time, the replenishing water of the water replenishing main pipe 106 is sprayed in the chamber I of the casing 101 through the atomizing spray head I 107 and forms atomized droplets, the exhaust utilizes the heated feed water to make the water reach the saturated temperature, so that the oxygen solubility is reduced to escape, and then the oxygen on the water surface is discarded;

[0037] The oxygen dissolved in the atomized droplets is precipitated and discharged from the outlet end 103 with the exhaust steam, and the atomized droplets after oxygen removal fall to the bottom of the shell 101 under the action of gravity. Then the pump body 112 is started, and the liquid water at the bottom of the chamber is pumped out through the delivery pipe one 111 and delivered into the delivery pipe two 114, and then delivered into the delivery pipe three 115 through the delivery pipe two 114, and the delivery pipe three 115 is discharged through the connecting pipe to the atomizing nozzle two 118 and discharged through the atomizing nozzle two 118. In this process, the exhaust continues to be heated, and after the first heating and oxygen removal, the dissolved oxygen content in the feed water has been greatly reduced, but there may still be residual oxygen. Through secondary heating and oxygen removal, the residual oxygen can be further removed by using additional heat, improving the oxygen removal efficiency of the feed water, ensuring that the quality of the feed water meets higher standards, and the dissolved oxygen content in the feed water is further reduced, which can reduce the oxygen corrosion and scaling of metal equipment in the thermal system, prolong the service life of the equipment, and reduce the frequency and cost of equipment maintenance and replacement.

[0038] It should be noted that the power equipment involved in the product is powered by an external power source.

[0039] Further;

[0040] In an optional embodiment, an inclined plate 110 is arranged in the chamber one, and the inclined plate 110 is fixedly connected with the shell 101, and the inclined plate 110 is designed to be inclined to one end of the delivery pipe one 111.

[0041] In this embodiment, the inclined plate 110 can guide the water to the position of the delivery pipe one 111, thereby improving the water pumping effect of the pump body 112.

[0042] Further;

[0043] In an optional embodiment, a flow sensor 113 is fixedly installed at the output end of the pump body 112, an automatic regulating valve 117 is fixedly installed on the connecting pipe of the delivery pipe three 115, and a controller 116 is fixedly installed on one side of the shell 101.

[0044] In this embodiment, when the pump body 112 delivers the liquid water into the delivery pipe two 114, the flow sensor 113 is used to monitor the flow in real time, and according to the data of the flow sensor 113, the automatic regulating valve 117 installed on the connecting pipe is adjusted by the controller 116 to control the flow into the atomizing nozzle two 118. When the flow increases, the automatic regulating valve 117 reduces the opening, and vice versa, so as to maintain the best working state of the atomizing nozzle, which can ensure that the best atomization effect is maintained under different flows, so that the dissolved oxygen can be removed from the water more effectively, and the oxygen removal efficiency is improved.

[0045] The utility model also proposes a steam exhaust device, including the shell 101 that has import end 102, export end 103 and steam exhaust device, still including above-mentioned steam turbine water supply and deaerating structure;

[0046] Import end 102 sets up at the top of shell 101, export end 103 sets up on the lateral wall of shell 101, import end 102 is made of two groups of port one, and two groups of port one are corresponding with chamber one and chamber two respectively Linkage, export end 103 is made of two groups of port two, and two groups of port two are corresponding with chamber one and chamber two respectively Linkage;

[0047] The both sides of baffle 108 are fixed with guide vane 109, and the surface of guide vane 109 is provided with water flow hole;

[0048] The one end of export end 103 is fixedly installed with condenser main part 104;

[0049] Shell 101 is located at chamber two position and is equipped with conveying equipment 105 through connecting pipe.

[0050] In the embodiment, the water after secondary deaerating is sent back to the boiler again by conveying equipment 105, and is heated to generate steam again, which is a key link of steam generation cycle in thermal power plant;

[0051] Shell 101 is located in chamber one and chamber two and is provided with guide vane 109, and guide vane 109 is located at export end 103 position, export end 103 can guide airflow to flow according to predetermined direction, reduces the turbulence and vortex of airflow, makes airflow more stable, and improves exhaust efficiency;

[0052] In the case of condenser main part 104, the export end 103 of exhaust device is connected with condenser main part 104, and the condenser main part 104 is used to cool and condense the exhaust steam of low-pressure cylinder into water, and the condensed water can be recycled and reused to generate steam again in the boiler, realizing recycling.

[0053] It should be noted that the import end 102 at the top of exhaust device is connected with the low-pressure cylinder of steam turbine, so as to send the steam remaining after work of low-pressure cylinder;

[0054] The surface of guide vane 109 is provided with water flow hole, water can enter the bottom of shell 101 through the water flow hole of guide vane 109, conveying equipment 105 can be composed of pipe body and pump, and water is pumped out and sent back to the boiler again under the connection of pipe body, and is heated to generate steam again.

[0055] The working principle and use process of the steam turbine water supplementing and oxygen removing structure and steam exhaust device are as follows: when used, the exhaust gas enters into the chamber one and the chamber two of the shell 101 from the opening one of the inlet end 102 respectively, at the same time, the supplemental water of the supplemental water mother pipe 106 is sprayed in the chamber one of the shell 101 through the atomizing nozzle one 107, and the atomizing liquid drops are formed, the exhaust gas is heated to make the water reach the saturated temperature, so that the oxygen solubility is reduced and then escapes, and then the oxygen on the water surface is removed; the oxygen dissolved in the atomizing liquid drops is precipitated and removed from the outlet end 103 with the exhaust gas, the atomizing liquid drops completing oxygen removal fall into the bottom of the shell 101 under the action of gravity, then the pump body 112 is started, the liquid water at the bottom of the chamber one is pumped out through the conveying pipe one 111 and is conveyed into the conveying pipe two 114, and then is conveyed into the conveying pipe three 115 through the conveying pipe two 114, and the conveying pipe three 115 is discharged through the connecting pipe and the atomizing nozzle two 118, and is discharged through the atomizing nozzle two 118, in the process, the exhaust gas is continuously heated for the second time, after the first time of heating and oxygen removing, the dissolved oxygen content in the water is greatly reduced, but there may be residual oxygen, through the second time of heating and oxygen removing, the residual oxygen can be further removed by using additional heat, the oxygen removing efficiency of the water is improved, the water quality reaches a higher standard, the dissolved oxygen content in the water is further reduced, the oxygen corrosion and the scaling phenomenon of the metal equipment in the thermal system are reduced, the service life of the equipment is prolonged, and the frequency and cost of maintenance and replacement of the equipment are reduced; the water after the second time of oxygen removing is sent back to the boiler through the conveying equipment 105, is heated again to generate steam, and the process is a key link of the steam generation cycle of the thermal power plant.

[0056] Meanwhile, the contents not described in detail in the specification all belong to the prior art known by the person skilled in the art.

Claims

1. A steam turbine water replenishing and deaerating structure, characterized in that, The steam turbine water replenishing and deoxidizing structure comprises a water replenishing main pipe (106) fixedly installed on a shell (101) of a steam exhaust device and a plurality of groups of atomizing spray heads (107) installed on the water replenishing main pipe (106). The shell (101) is internally fixed with a partition plate (108), and the shell (101) is divided into a chamber one and a chamber two through the partition plate (108). One side of the shell (101) is fixedly installed with a pump body (112) through a support plate, an input end of the pump body (112) is fixedly communicated with a conveying pipe one (111), and an output end of the pump body (112) is fixedly communicated with a conveying pipe two (114). One end of the conveying pipe two (114) is fixedly communicated with a conveying pipe three (115) with a closed structure at both ends, and the conveying pipe three (115) is fixedly communicated with a plurality of groups of atomizing spray heads two (118) through a connecting pipe.

2. The steam turbine water replenishing and deaerating structure according to claim 1, characterized in that: Part of the water replenishing main pipe (106) and the atomizing spray heads one (107) are located in the chamber one of the shell (101), and one end of the conveying pipe one (111) extends into the chamber one of the shell (101) and is fixedly connected with the shell (101).

3. The steam turbine water replenishing and deoxidizing structure according to claim 1, characterized in that: One end of the conveying pipe three (115) extends into the chamber two of the shell (101) and is fixedly connected with the shell (101).

4. The steam turbine water replenishing and deoxidizing structure according to claim 1, characterized in that: An inclined plate (110) is arranged in the chamber one, the inclined plate (110) is fixedly connected with the shell (101), and the inclined plate (110) is designed to be inclined to one end of the conveying pipe one (111).

5. The steam turbine water replenishing and deoxidizing structure according to claim 1, characterized in that: A flow sensor (113) is fixedly installed at the output end of the pump body (112), an automatic adjusting valve (117) is fixedly installed on the connecting pipe of the conveying pipe three (115), and a controller (116) is fixedly installed on one side of the shell (101).

6. A steam exhaust device comprising a housing (101) having an inlet end (102), an outlet end (103) and a steam exhaust device, characterized in that, The steam turbine water replenishing and deoxidizing structure also comprises the steam turbine water replenishing and deoxidizing structure according to any one of claims 1 to 5.

7. The steam exhaust device according to claim 6, characterized in that: The inlet end (102) is arranged at the top of the shell (101), the outlet end (103) is arranged on the side wall of the shell (101), the inlet end (102) is composed of two groups of ports one, and the two groups of ports one are correspondingly communicated with the chamber one and the chamber two, respectively, the outlet end (103) is composed of two groups of ports two, and the two groups of ports two are correspondingly communicated with the chamber one and the chamber two, respectively.

8. The steam exhaust apparatus according to claim 7, characterized by: Flow guide plates (109) are fixed on both sides of the partition plate (108), and flow holes are formed in the surfaces of the flow guide plates (109).

9. The steam exhaust apparatus according to claim 7, characterized by: A condenser main body (104) is fixedly installed at one end of the outlet end (103).

10. The steam exhaust apparatus according to claim 7, characterized by: A conveying device (105) is installed at the position of the chamber two of the shell (101) through a connecting pipe.

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