CN100434853C - Two-stage water-inlet supersonic vapor-liquid two-phase flow booster heating device - Google Patents

Abstract

Two-stage supersonic vapor-liquid two-phase flow boost heating device with water inlet, including a steam nozzle and an annular water nozzle connected to the inlet of the mixing chamber that first tapers and then gradually expands, and the annular water nozzle connected with the cold water pipe is set in the steam On the periphery of the nozzle, a secondary water nozzle communicating with the secondary cooling water pipe is arranged on the periphery of the throat of the mixing chamber. The present invention adds a water nozzle for secondary water inlet at the throat of the mixing chamber of the existing device or at the outlet of the device. According to the needs of the actual application system, the ratio of the mass flow rate of cold water and steam entering the device is determined to obtain the required temperature rise of the device. , and effectively increase the mass flow ratio of cold water and steam entering the device, thereby reducing the temperature rise of the device.

Description

Two-stage water-inlet supersonic vapor-liquid two-phase flow booster heating device

technical field

The invention belongs to the technical field of heat exchange equipment (F28C) which does not react with each other by directly contacting pumping fluid (F04F) and heat exchange medium with other fluids, and specifically relates to a two-stage process for converting heat energy to mechanical energy Water supersonic vapor-liquid two-phase flow booster heating device.

Background technique

The supersonic vapor-liquid two-phase flow booster heating device uses the kinetic energy of the high-speed steam flow to mix with supercooled water to form a supersonic vapor-liquid two-phase mixed flow, and then generates condensation shock waves after passing through the channel with variable cross-section, and the pressure rises to become hot water. The supersonic vapor-liquid two-phase flow booster heating device has the advantages of simple structure, reliable operation, strong boosting capacity, and high heat exchange efficiency, and has broad application prospects. However, in practical applications, due to the small mass flow rate ratio of the cold water entering the device and the steam, the existing supersonic vapor-liquid two-phase flow booster heating device has an excessively large temperature difference between the outlet hot water and the inlet cold water, that is, the temperature rise is too high. high question. If the temperature rise of the device is too high, it will seriously affect the operation stability of the device and the thermal economy of the application system, and reduce the application range of the device.

Contents of the invention

The purpose of the present invention is to provide a two-stage supersonic gas-liquid two-phase water inlet that can effectively increase the mass flow ratio of cold water and steam entering the device, reduce the temperature rise of the device, and ensure the original boosting capacity. Flow booster heating device.

In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is to include a steam nozzle and an annular water nozzle connected to the inlet of the mixing chamber that first tapers and then gradually expands, and the annular water nozzle connected with the cold water pipe is arranged on the periphery of the steam nozzle , which is characterized in that the periphery of the throat of the mixing chamber is provided with a secondary water nozzle connected to the secondary cold water pipe.

Another feature of the present invention is: the inner surface of the mixing chamber adopts a streamlined axisymmetric rotating structure; The periphery of the throat of the pipe; the inner surface of the secondary water nozzle adopts a streamlined axisymmetric rotating body structure; the inner surface of the reducer adopts a streamlined axisymmetric rotating body structure.

Since the present invention adds a water nozzle for secondary water inlet at the throat of the mixing chamber of the existing device or at the outlet of the device, according to the needs of the actual application system, the ratio of the mass flow rate of cold water and steam entering the device is determined to obtain the required temperature of the device. liter, and effectively increase the mass flow ratio of cold water and steam entering the device, thereby reducing the temperature rise of the device.

Description of drawings

Fig. 1 is the overall structural representation of the present invention, wherein Fig. 1 (a) is the structural representation of embodiment 1, and Fig. 1 (b) is the structural representation of embodiment 2;

Fig. 2 is a working principle diagram of the present invention, wherein Fig. 2(a) is a working principle diagram of Embodiment 1, and Fig. 2(b) is a working principle diagram of Embodiment 2.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment 1: referring to Fig. 1 (a), the present invention comprises the steam nozzle 1 and the annular water nozzle 3 that are communicated with the inlet of the mixing chamber 4 that tapers first and then diverges gradually, and the annular water nozzle 3 that links to each other with the cold water pipe 2 is provided with On the periphery of the steam nozzle 1 , on the periphery of the throat of the mixing chamber 4 , a secondary water nozzle 6 communicating with the secondary cooling water pipe 5 is arranged. The inner surface of the mixing chamber 4 and the secondary water nozzle 6 adopts a streamlined axisymmetric rotating body structure, which can reduce the loss caused by wall resistance and make the outlet hot water have a high pressure. Type installation, easy to install and disassemble and replace parts.

Embodiment 2: Referring to Fig. 1 (b), the present invention comprises a steam nozzle 1 and an annular water nozzle 3 communicated with the inlet of the mixing chamber 4 that tapers first and then expands gradually, and the annular water nozzle 3 that is connected with the cold water pipe 2 is set On the periphery of the steam nozzle 1 , the outlet of the mixing chamber 4 is sequentially provided with a straight pipe section 7 and a reducer 8 which communicate with each other, and the secondary water nozzle 6 is arranged on the periphery of the throat of the reducer 8 .

The working principle of the present invention is as follows: referring to Fig. 2 (a), (b), the present invention utilizes the supersonic airflow formed after the expansion of high-pressure steam through the supersonic steam nozzle 1 as a power source, in the variable section mixing chamber 4 and the low-pressure water The water flow of the nozzle 3 forms a supersonic vapor-liquid two-phase flow after direct contact, and mixes into a uniform supersonic vapor-liquid two-phase flow before reaching the throat of the mixing chamber 4. After the condensation shock wave is formed at the throat of the mixing chamber 4, the pressure increases And become single-phase hot water, when the flow is blocked, a condensation shock wave is generated to realize a sudden pressure change, and a high-pressure water flow far exceeding the inlet steam pressure is obtained at the outlet of the variable cross-section mixing chamber 4, thereby achieving the purpose of greatly increasing the water pressure . In the present invention, a secondary water nozzle 6 is added at the throat of the mixing chamber 4 or at the outlet of the mixing chamber 4 to introduce secondary water, thereby effectively increasing the mass flow ratio of cold water and steam entering the device to reduce the temperature rise of the device the goal of.

Claims (4)

1, the two-stage water inlet supersonic speed stream-liquid two-phase flow heater that boosts, comprise and the first convergent steam jet [1] and the annular (operating) water nozzle [3] that are connected of the inlet of the hybrid chamber of flaring [4] again, the annular (operating) water nozzle [3] that links to each other with cold water pipe [2] is arranged on the periphery of steam jet [1], it is characterized in that: the throat's outer periphery at hybrid chamber [4] is equipped with the secondary (operating) water nozzle [6] that is connected with secondary cold water pipe [5]; The outlet of hybrid chamber [4] also can be disposed with straight length [7] and the reducing pipe [8] that is interconnected, and secondary (operating) water nozzle [6] can be arranged on the throat periphery of reducing pipe [8].

2, the two-stage according to claim 1 water inlet supersonic speed stream-liquid two-phase flow heater that boosts, it is characterized in that: said hybrid chamber [4] is fairshaped axial symmetry rotation body structure for inner surface adopts.

3, the two-stage according to claim 1 water inlet supersonic speed vapour-liquid two-phase heater that boosts, it is characterized in that: said secondary (operating) water nozzle [6] is fairshaped axial symmetry rotation body structure for inner surface adopts.

4, the two-stage according to claim 1 water inlet supersonic speed stream-liquid two-phase flow heater that boosts, it is characterized in that: said reducing pipe [8] is fairshaped axial symmetry rotation body structure for inner surface adopts.

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