CN211819983U - Based on steam excess pressure sled dress formula compressed air supply system - Google Patents
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Abstract
The utility model relates to a sled dress formula compressed air supply system based on steam excess pressure, include: based on the steam residual pressure skid-mounted compressed air supply device, a steam inlet pressure regulating valve, a steam flow regulating valve and a steam outlet pressure regulating valve; the skid-mounted compressed air supply device based on steam residual pressure comprises: steam turbines and centrifugal air compressors; the steam turbine and the centrifugal air compressor are assembled and integrated. The utility model has the advantages that: the centripetal steam turbine has the advantages of small flow, small power, simple system and the like, and is particularly suitable for steam pressure energy recovery occasions facing end users; the steam pressure energy is directly converted into compressed air on site without being converted into electric power, so that secondary conversion is reduced, and the method has the advantages of high steam pressure energy recycling efficiency, no need of grid-connected equipment and the like; the steam and compressed air pressure has wide application range, and the device and the system have prying design and have the advantage of being capable of being transferred to different occasions for repeated use.
Description
Technical Field
The utility model relates to a based on steam excess pressure sled dress formula compressed air supply system mainly is applicable to all kinds of central heating's industrial park and steam enterprise.
Background
According to incomplete statistics, the national and provincial industrial parks are 2543 in total, 14000 in total, the number of enterprises gathered in the industrial parks is from dozens to thousands, the types of the enterprises are different, and the energy consumption requirements of the enterprises in the parks are different, and generally comprise electric power, steam, natural gas, compressed air and the like. The steam demand of original garden enterprises is generally self-built small boiler heat supply, and the problems of low energy utilization efficiency, high pollutant emission and the like exist. In order to improve the energy utilization efficiency and reduce the pollutant emission, a large and medium cogeneration unit is adopted for central heat supply, and clean and efficient cogeneration steam is conveyed to steam users of enterprises. However, the mode has certain disadvantages, as the caliber of the steam pipe network is larger, the occupied area of the pipe network routing is larger, the urban layout and the attractiveness are affected, the construction cost is high, the steam pipe network is designed according to the highest steam pressure in a park, an enterprise adjusts the steam pressure through a temperature and pressure reducing device according to the self requirement to reduce the grade of the steam, according to the first law of thermodynamics, although the total energy loss in the steam is not caused by temperature and pressure reduction, according to the second law of thermodynamics, the process of steam temperature and pressure reduction (conversion to low grade) is an irreversible process of entropy increase and enthalpy reduction, and the working capacity of the steam is reduced. Meanwhile, steam users or other users in the garden have compressed air demands, a small screw air compressor is generally built by themselves, the compressed air conversion efficiency is low, oil-containing wastewater is difficult to discharge and treat, and the maintenance cost of the air compressor is high.
At present, a medium-large back pressure turbine is generally adopted to recover steam pressure energy, the utilization of steam pressure difference of a large-flow and medium-high grade section can only be solved, and various conditions such as steam supply stability, installed capacity, site space, economic scale and the like are required to meet higher requirements at the same time. And many enterprises in general garden demand steam pressure each different, and steam pressure is difficult to unify, and each enterprise's quantity is generally only 1 ~ 20t/h, can realize theoretically that steam pressure difference power scale is smaller, and most all are less than about 1 MW. The existing axial flow steam turbine is adopted to recover steam pressure energy, the power is generally more than 2MW, the axial flow steam turbine is limited by the structure of the axial flow steam turbine, the miniaturization development is not mature, the installed power capable of running maturely and stably is generally not less than 2MW, meanwhile, the space occupied by the axial flow steam turbine is large, almost all the axial flow steam turbine adopts a common temperature and pressure reducing device to throttle and spray water for internal cooling on steam, and the work capacity lost in steam grade degradation is wasted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a retrieve steam pressure ability, solve the steam and supply and demand the parameter and mismatch the energy loss problem of bringing, realize that the steam step synthesizes high-efficient utilization, provide one kind based on steam excess pressure sled dress formula compressed air supply system.
This kind is based on steam excess pressure sled dress formula compressed air supply system includes: based on the steam residual pressure skid-mounted compressed air supply device, a steam inlet pressure regulating valve, a steam flow regulating valve and a steam outlet pressure regulating valve; the skid-mounted compressed air supply device based on steam residual pressure comprises: steam turbines and centrifugal air compressors; the steam turbine and the centrifugal air compressor are assembled and integrated; the steam turbine and the centrifugal air compressor share a bearing;
the inlet of the steam inlet pressure regulating valve is connected with the high-pressure steam inlet, and the outlet of the steam inlet pressure regulating valve is connected with the inlet of the steam flow regulating valve; the outlet of the steam flow regulating valve is connected with the inlet of a steam turbine in the skid-mounted compressed air supply device based on the residual steam pressure; the outlet of a steam turbine in the steam excess pressure skid-mounted compressed air supply device is connected with the inlet of a steam outlet pressure regulating valve, and the outlet of the steam outlet pressure regulating valve is connected with a low-pressure steam outlet;
an inlet of a centrifugal air compressor in the prying type compressed air supply device based on the residual steam pressure is connected with a fresh air inlet; an outlet of a centrifugal air compressor in the skid-mounted compressed air supply device is connected with a compressed air outlet based on the residual steam pressure;
in the steam turbine: the turbine wheel is placed in the turbine volute; the turbine wheel is a turbine steam inlet channel in the radial direction; the turbine steam inlet channel is connected with a turbine steam inlet; the turbine wheel is axially provided with a steam exhaust channel; the steam exhaust channel is connected with a steam outlet of the turbine; the turbine impeller is arranged on the bearing, and a steam sealing ring is arranged on the bearing at one end of the steam turbine; a turbine positioning snap ring is arranged at one end, close to the steam turbine, of the joint of the bearing by taking the joint of the steam turbine and the centrifugal air compressor as a boundary;
the centrifugal air compressor comprises a rotor and a stator, the rotor comprises a compressor impeller and a bearing, and blades are arranged on the compressor impeller; the main body of the stator is a compressor volute, and the stator is also provided with a compressor air inlet channel, a compressor exhaust channel, a compressor rear end cover and a compressor air inlet; and a compressor positioning snap ring is arranged at one end of the centrifugal air compressor on the bearing.
Preferably, the skid-mounted compressed air supply system based on steam residual pressure is integrally designed in a skid mode.
The utility model has the advantages that:
(1) the centripetal steam turbine has the advantages of small flow, small power, simple system and the like, and is particularly suitable for the steam pressure energy recovery occasion facing to the end user.
(2) The steam pressure energy is directly converted into compressed air on site without being converted into electric power, secondary conversion is reduced, and the method has the advantages of high steam pressure energy recycling efficiency, no need of grid-connected equipment and the like.
(3) The steam and compressed air pressure has wide application range, and the device and the system have prying design and have the advantage of being capable of being transferred to different occasions for repeated use.
Drawings
FIG. 1 is a flow diagram of a skid-mounted compressed air supply system based on excess steam pressure;
fig. 2 is a block diagram of a skid-mounted compressed air supply system based on steam overpressure.
Description of reference numerals: the turbine steam inlet 1, the turbine steam inlet passage 2, the turbine volute 3, the turbine steam outlet 4, the turbine impeller 5, the steam sealing ring 6, the bearing 7, the turbine positioning clamping ring 8, the compressor volute 9, the compressor rear end cover 10, the compressor exhaust passage 11, the compressor impeller 12, the compressor inlet passage 13, the compressor air inlet 14 and the compressor positioning clamping ring 15; the device comprises a skid-mounted compressed air supply device 16 based on steam residual pressure, a steam inlet pressure regulating valve 17, a steam flow regulating valve 18, a steam outlet pressure regulating valve 19, a high-pressure steam inlet 20, a low-pressure steam outlet 21, a fresh air inlet 22 and a compressed air outlet 23.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
This kind of sled dress formula compressed air supply system based on steam residual pressure, as shown in fig. 2, includes: based on the steam residual pressure skid-mounted compressed air supply device 16, a steam inlet pressure regulating valve 17, a steam flow regulating valve 18 and a steam outlet pressure regulating valve 19; the steam residual pressure based skid-mounted compressed air supply device 16 includes: steam turbines and centrifugal air compressors; the steam turbine and the centrifugal air compressor are assembled and integrated; the former is power, the latter is driven, the steam turbine and the centrifugal air compressor share a bearing 7;
the inlet of the steam inlet pressure regulating valve 17 is connected with a high-pressure steam inlet 20, and the outlet of the steam inlet pressure regulating valve 17 is connected with the inlet of a steam flow regulating valve 18; the outlet of the steam flow regulating valve 18 is connected with the inlet of a steam turbine in the skid-mounted compressed air supply device 16 based on the residual steam pressure; the outlet of the steam turbine in the steam excess pressure skid-mounted compressed air supply device 16 is connected with the inlet of a steam outlet pressure regulating valve 19, and the outlet of the steam outlet pressure regulating valve 19 is connected with a low-pressure steam outlet 21;
the inlet of the centrifugal air compressor in the skid-mounted compressed air supply device 16 based on the residual steam pressure is connected with the fresh air inlet 22; the outlet of a centrifugal air compressor in the skid-mounted compressed air supply device 16 is connected with a compressed air outlet 23 based on the residual steam pressure;
in the steam turbine: the turbine wheel 5 is placed inside the turbine volute 3; the turbine wheel 5 is a turbine steam inlet passage 2 in the radial direction; the turbine steam inlet passage 2 is connected with a turbine steam inlet 1; the turbine wheel 5 is axially provided with a steam exhaust channel; the steam exhaust channel is connected with a steam outlet 4 of the turbine; the turbine wheel 5 is arranged on a bearing 7, and a steam sealing ring 6 is arranged at one end of the steam turbine on the bearing 7 and used for preventing steam leakage; a turbine positioning snap ring 8 is arranged at one end, close to the steam turbine, of the joint of the bearing 7 by taking the joint of the steam turbine and the centrifugal air compressor as a boundary;
the centrifugal air compressor comprises a rotor and a stator, the rotor comprises a compressor impeller 12 and a bearing 7, and the compressor impeller 12 is provided with blades; the main body of the stator is a compressor volute 9, and the stator is also provided with a compressor air inlet 13, a compressor exhaust 11, a compressor rear end cover 10 and a compressor air inlet 14; and a compressor positioning snap ring 15 is arranged at one end of the centrifugal air compressor on the bearing 7.
The skid-mounted compressed air supply system based on the steam residual pressure is integrally designed in a skid mode.
As shown in fig. 1, the working method of the skid-mounted compressed air supply system based on the steam residual pressure comprises the following steps:
step 1, high-pressure steam enters from a high-pressure steam inlet 20, and the steam pressure of the high-pressure steam is set in the adaptive range of a steam turbine through a steam inlet pressure regulating valve 17; then passes through a steam flow regulating valve 18;
step 2, high-pressure steam enters the annular nozzle ring through a turbine steam inlet passage 2 of the steam turbine along the radial direction, and the high-pressure steam expands and accelerates in the annular nozzle ring to obtain high-speed steam flow;
step 4, converting the steam from the radial direction to the axial direction along the outlet direction of the turbine wheel 5 and discharging the steam; then the pressure of the steam is set to the pressure of the steam by a steam outlet pressure regulating valve 19 of the steam turbine; steam is supplied to a hot user or a steam consuming point;
and 5, driving a centrifugal air compressor by mechanical work generated by the steam turbine, and compressing the air to 0.5-0.9 Mpa by two-stage or three-stage compression to supply the air to an air-using enterprise or an air-using point.
Step 1, the steam turbine is used for recovering steam pressure energy; step 5, the centrifugal air compressor is used for converting steam pressure energy into compressed air; the steam turbine is connected with a centrifugal air compressor through a coupler or a speed reducer. The problem of steam energy loss caused by mismatching of the heating steam parameters and the user parameters is solved.
The steam turbine in the step 1 adopts a centripetal single-stage turbine, and the steam turbine performs radial steam admission and axial steam exhaust.
Step 1, pressure reducing valves are arranged at a turbine steam inlet 1 and a turbine steam outlet 4 of the steam turbine, and the pressure reducing valves are used for setting the steam pressure of the turbine steam inlet 1 and the turbine steam outlet 4.
The control modes of the steam inlet pressure regulating valve 17, the steam flow regulating valve 18 and the steam outlet pressure regulating valve 19 in the steps 1 and 4 comprise: electric control or pneumatic control; the steam inlet pressure regulating valve 17 is used for regulating steam parameters of the steam turbine within a design range; the steam flow regulating valve 18 is used for regulating the rotating speed of the steam turbine and the centrifugal air compressor within a design range; the steam outlet pressure regulating valve 19 is used for regulating the outlet pressure of the steam turbine to meet the production requirements of users.
Example (b):
a thermal power plant adopts DN550 heat supply pipelines to centrally supply heat to surrounding industrial users, the steam parameters of the first section of the heat supply pipeline are 1.5MPa and 260 ℃, the steam parameters of the last section of the heat supply pipeline are 1.1MPa and 205 ℃, the heat supply flow is 120t/h, the number of the heat supply users is about 30, the number of the larger steam users is 8, the steam parameters of a steam point pipe network used by a company A is 1.2MPa and 210 ℃, and the steam parameters of a steam point pipe network used by a company B is 1.3MPa and 230 ℃. The company A mainly manages the pharmaceutical manufacturing, and the production needs 0.6MPa, 160 ℃ and about 10t/h, and additionally needs 0.8MPa compressed air about 80Nm 3/min.
By adopting the patent, a set of steam excess pressure skid-mounted compressed air supply device and system is designed for company A, the design flow of a steam turbine is 10t/h, the thermal efficiency is 80%, the parameters of a steam inlet and a steam outlet are (1.2MPa, 210 ℃)/(0.6MPa, 160 ℃) and the power is 210kW, the outlet pressure of an air compressor is 0.8MPa, the designed gas production is 23Nm3/min, the original steam temperature and pressure reducer is replaced, and the rest of compressed air of company A is provided by original equipment. The process production of company A is about 7000 hours all the year, the compressed air is about 0.12 yuan/Nm 3 according to the industrial electricity price, 116 ten thousand of electricity charges can be saved due to the compressed air every year, but the steam consumption can be increased due to the reduction of the steam quality, the heat reduced by the work of a steam turbine is reduced, the steam cost per ton is about 6 yuan, the steam cost of company A is increased by 42 ten thousand yuan every year, the market price of the device and the system is 300 ten thousand yuan, 74 ten thousand yuan is gained every year after the production, and the investment is recovered in about 4 years.
Claims (2)
1. A skid-mounted compressed air supply system based on steam overpressure is characterized by comprising: based on the steam residual pressure skid-mounted compressed air supply device (16), a steam inlet pressure regulating valve (17), a steam flow regulating valve (18) and a steam outlet pressure regulating valve (19); the skid-mounted compressed air supply device (16) based on steam residual pressure comprises: steam turbines and centrifugal air compressors; the steam turbine and the centrifugal air compressor are assembled and integrated; the steam turbine and the centrifugal air compressor share a bearing (7);
the inlet of the steam inlet pressure regulating valve (17) is connected with a high-pressure steam inlet (20), and the outlet of the steam inlet pressure regulating valve (17) is connected with the inlet of a steam flow regulating valve (18); the outlet of the steam flow regulating valve (18) is connected with the inlet of a steam turbine in the skid-mounted compressed air supply device (16) based on the residual steam pressure; an outlet of a steam turbine in the steam excess pressure skid-mounted compressed air supply device (16) is connected with an inlet of a steam outlet pressure regulating valve (19), and an outlet of the steam outlet pressure regulating valve (19) is connected with a low-pressure steam outlet (21);
the inlet of a centrifugal air compressor in the skid-mounted compressed air supply device (16) based on the residual steam pressure is connected with a fresh air inlet (22); the outlet of a centrifugal air compressor in the skid-mounted compressed air supply device (16) is connected with a compressed air outlet (23) based on the residual steam pressure;
in the steam turbine: the turbine wheel (5) is placed in the turbine volute (3); the turbine wheel (5) is a turbine steam inlet channel (2) in the radial direction; the turbine steam inlet channel (2) is connected with a turbine steam inlet (1); the turbine impeller (5) is axially provided with a steam exhaust channel; the steam exhaust channel is connected with a steam outlet (4) of the turbine; the turbine impeller (5) is arranged on a bearing (7), and a steam sealing ring (6) is arranged on one end of the steam turbine on the bearing (7); a turbine positioning snap ring (8) is arranged at one end, close to the steam turbine, of the joint of the bearing (7) and the centrifugal air compressor by taking the joint of the steam turbine and the centrifugal air compressor as a boundary;
the centrifugal air compressor comprises a rotor and a stator, the rotor comprises a compressor impeller (12) and a bearing (7), and blades are arranged on the compressor impeller (12); the main body of the stator is a compressor volute (9), and the stator is also provided with a compressor air inlet (13), a compressor exhaust passage (11), a compressor rear end cover (10) and a compressor air inlet (14); and a compressor positioning snap ring (15) is arranged at one end of the centrifugal air compressor on the bearing (7).
2. The steam overpressure based skid-mounted compressed air supply system of claim 1, wherein: the skid-mounted compressed air supply system based on the steam residual pressure is designed to be integrally skid-mounted.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255708A (en) * | 2020-03-16 | 2020-06-09 | 浙江浙能技术研究院有限公司 | Skid-mounted compressed air supply system and method based on steam residual pressure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255708A (en) * | 2020-03-16 | 2020-06-09 | 浙江浙能技术研究院有限公司 | Skid-mounted compressed air supply system and method based on steam residual pressure |
| CN111255708B (en) * | 2020-03-16 | 2024-05-24 | 浙江浙能技术研究院有限公司 | Skid-mounted compressed air supply system and method based on residual steam pressure |
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