阅读说明：本技术 一种混合式蒸汽发生系统和流量分配方法 (Hybrid steam generation system and flow distribution method ) 是由 张建元 许朋江 居文平 常东锋 吕凯 王妍 邓佳 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种混合式蒸汽发生系统和流量分配方法,该系统由混合器一、混合器二、分流板、液位监测装置、用户、温度测点、压力测点和流量测点组成；本发明还公开了混合后蒸汽的流量分配方法；本发明提出了一种具备工程可操作性的混合式蒸发换热系统以及对应的流量分配控制方法,通过对间接信号的测量和转化,完成混合后蒸汽流量的准确分配,混合式蒸发器可节省大量的金属材料,在联合循环中具有广阔的应用前景。(The invention discloses a mixed steam generation system and a flow distribution method, wherein the system consists of a mixer I, a mixer II, a flow distribution plate, a liquid level monitoring device, a user, a temperature measuring point, a pressure measuring point and a flow measuring point; the invention also discloses a flow distribution method of the mixed steam; the invention provides a hybrid evaporation heat exchange system with engineering operability and a corresponding flow distribution control method, which can be used for accurately distributing the flow of mixed steam by measuring and converting indirect signals, and the hybrid evaporator can save a large amount of metal materials and has wide application prospect in combined circulation.)

1. A hybrid steam generation system, characterized by: the device comprises a liquid temperature measuring point (1), a liquid pressure measuring point (2), a liquid flow measuring point I (3), a first valve (4), a liquid flow measuring point II (5), a mixer I (6), a mixer II (7), a flow distribution plate (8), a user I (9), a vapor temperature measuring point (10), a vapor pressure measuring point (11), a second valve (12), a third valve (13), a liquid level monitoring device (14), a user II (15), a fourth valve (16), a mixed vapor temperature measuring point I (17), a mixed vapor pressure measuring point I (18), a mixed vapor temperature measuring point II (19) and a mixed vapor pressure measuring point II (20);

the phase state of the working medium at the outlet of the first user (9) is liquid, the liquid working medium is divided into two paths, one path is connected with the liquid inlet of the first mixer (6) through a first valve (4), and the other path is connected with the liquid inlet of the second mixer (7) through a fourth valve (16); the phase state of the working medium at the outlet of the second user (15) is a steam state, the steam working medium is divided into two paths, one path is connected with the steam state inlet of the second mixer (7) through a second valve (12), and the other path is connected with the steam state inlet of the first mixer (6) through a third valve (13); a flow distribution plate (8) is arranged at the upper parts in the first mixer (6) and the second mixer (7) close to the liquid inlet, liquid level monitoring devices (14) are arranged at the lower parts in the first mixer (6) and the second mixer (7), a steam outlet of the first mixer (6) is connected with an inlet of a first user (9), and a steam outlet of the second mixer (7) is connected with an inlet of a second user (15); the liquid temperature measuring point (1), the liquid pressure measuring point (2) and the liquid flow measuring point I (3) are arranged on an outlet main pipeline of the user I (9), the liquid flow measuring point II (5) is arranged between the first valve (4) and the mixer I (6), the vapor temperature measuring point (10) and the vapor pressure measuring point (11) are arranged on an outlet main pipeline of the user II (15), the mixed vapor temperature measuring point I (17) and the mixed vapor pressure measuring point I (18) are arranged on an outlet steam pipeline of the mixer I (6), and the mixed vapor temperature measuring point II (19) and the mixed vapor pressure measuring point II (20) are arranged on an outlet steam pipeline of the mixer II (7).

2. A hybrid steam generation system as recited in claim 1, further comprising: the data obtained from the temperature, pressure and flow measurements are used to calculate the mass flow ratio to mixer one (6) and mixer two (7).

3. A hybrid steam generation system as recited in claim 1, further comprising: the liquid level monitoring device (14) is used for indirectly reflecting the heat exchange state in the first mixer (6) and the second mixer (7).

4. A flow distribution method for a hybrid steam generation system according to any one of claims 1 to 3, wherein: the method comprises the following specific steps:

the liquid working medium at the outlet of the first user (9) is divided into two parts, wherein one part enters the first mixer (6) under the control of the first valve (4), and the other part enters the second mixer (7) under the control of the fourth valve (16); meanwhile, the steam working medium at the outlet of the second user (15) is also divided into two parts, wherein one part enters the first mixer (6) under the control of the third valve (13), and the other part enters the second mixer (7) under the control of the second valve (12); mixing and heat exchanging the liquid working medium and the vapor working medium in the mixer I (6) to form steam, then, enabling the steam to completely enter a user I (9), mixing and heat exchanging the liquid working medium and the vapor working medium in the mixer II (7) to form steam, and then, enabling the steam to completely enter a user II (15); the flow distribution plate (8) is used for strengthening heat exchange between the liquid working medium and the vapor working medium, and the valve opening degrees of the second valve (12) and the third valve (13) are adjusted according to the indication number of the liquid level monitoring device (14);

in order to realize the mass flow equality of the inlet vaporous working medium and the outlet liquid working medium of the user I (9) and the mass flow equality of the inlet vaporous working medium and the outlet liquid working medium of the user II (15), the system operation needs to use the following flow distribution method:

the device comprises a liquid temperature measuring point (1), a liquid pressure measuring point (2), a liquid flow measuring point I (3), a liquid flow measuring point II (5), a vapor temperature measuring point (10), a vapor pressure measuring point (11), a mixed vapor temperature measuring point I (17), a mixed vapor pressure measuring point I (18), and a mixed vapor temperatureThe data measured by the measuring point II (19) and the mixed steam pressure measuring point II (20) are respectively used as t_L、p_L、m_L、m_L,1、t_V、p_V、t₁、p₁、t₂And p₂Indicating that the mass flow of the vaporous working medium at the outlet of the second user 15 is unknown and is m_VExpressing that the thermodynamic specific enthalpy of the working medium is expressed by using a function h (t, p), and keeping t in the system operation process₁And t₂Equal, p₁And p₂If the liquid level monitored by the liquid level monitoring device (14) is stable, the flow ratio of the liquid working medium to the mixer I (6) is as follows,

h(t_L,p_L)·m_L+h(t_V,p_V)·m_V＝(m_L+m_V)·h(t₁,p₁)

a first liquid flow measuring point (3) is arranged at the outlet of the first user (9), a second liquid flow measuring point (5) is arranged between the first valve (4) and the first mixer (6), and the opening degree of the first valve (4) and the opening degree of the fourth valve (16) are monitored and adjusted through flow to ensure that m is equal to m_L,1And m_LThe ratio of the mass flow rate of the inlet and the outlet of the first user (9) and the mass flow rate of the inlet and the outlet of the second user (15) can be equal by conforming to the calculation formula.

Technical Field

The invention belongs to the technical field of evaporation heat exchange, and particularly relates to a hybrid steam generation system and a flow distribution method, which are suitable for the design of a thermodynamic system with a hybrid heat exchanger, can obviously reduce the cost of the heat exchanger, and can realize accurate distribution of mixed flow.

Background

The heat exchanger is a heat engineering basic device, has important position in chemical industry, power and other industrial production, and the evaporator is an important one, and transfers the heat of high-temperature fluid to low-temperature fluid, and finally the low-temperature fluid is evaporated to complete phase change to form steam. The mixed steam generator is a special evaporator, two different phase states of the same working medium are mixed and heat exchanged in the generator to finally form steam with the same state parameters, the two phase states are generally in a vapor state and a liquid state, the pressure is basically equal, the vapor working medium is in an overheat state, the two working media are mixed and then pass through a heat and mass transfer process, and the vapor working medium directly transfers heat to the liquid working medium to cause phase change. The mixed steam generator has the advantages that the metal material amount for the heat exchanger is greatly reduced, because the common heat exchanger is a dividing wall type heat exchanger, two heat exchange fluids are not contacted with each other, a heat transfer wall surface is formed by using the metal material in order to execute the heat transfer process, the liquid evaporation must overcome a large amount of latent heat, the area of the common evaporator is very large, and the consumed metal material amount is also very large. The hybrid steam generator can be used for a combined cycle power generation system to improve the power generation efficiency of the whole cycle, and because steam is easily compressed, the flow can not be accurately measured, so that the problem of flow distribution after mixing and heat exchange of two fluids must be solved by applying the hybrid steam generator on a large scale, otherwise, the whole stability and the economy of the system can be directly influenced by large flow deviation.

Disclosure of Invention

In order to solve the problem of flow ratio of a hybrid evaporator, the invention provides a hybrid steam generation system and a flow distribution method.

In order to achieve the purpose, the invention adopts the following technical scheme.

A mixed steam generation system is composed of a liquid temperature measuring point 1, a liquid pressure measuring point 2, a liquid flow measuring point I3, a first valve 4, a liquid flow measuring point II 5, a mixer I6, a mixer II 7, a flow distribution plate 8, a user I9, a vapor temperature measuring point 10, a vapor pressure measuring point 11, a second valve 12, a third valve 13, a liquid level monitoring device 14, a user II 15, a fourth valve 16, a mixed vapor temperature measuring point I17, a mixed vapor pressure measuring point I18, a mixed vapor temperature measuring point II 19 and a mixed vapor pressure measuring point II 20;

the phase state of the working medium at the outlet of the first user 9 is liquid, the liquid working medium is divided into two paths, one path is connected with the liquid inlet of the first mixer 6 through the first valve 4, and the other path is connected with the liquid inlet of the second mixer 7 through the fourth valve 16; the phase state of the working medium at the outlet of the second user 15 is a vapor state, the vapor working medium is divided into two paths, one path is connected with the vapor inlet of the second mixer 7 through a second valve 12, and the other path is connected with the vapor inlet of the first mixer 6 through a third valve 13; a flow distribution plate 8 is arranged at the upper parts in the first mixer 6 and the second mixer 7 close to the liquid inlet, liquid level monitoring devices 14 are arranged at the lower parts in the first mixer 6 and the second mixer 7, a steam outlet of the first mixer 6 is connected with an inlet 9 of a first user, and a steam outlet of the second mixer 7 is connected with an inlet 15 of a second user; the liquid temperature measuring point 1, the liquid pressure measuring point 2 and the liquid flow measuring point 3 are arranged on a first user 9 outlet main pipeline, the liquid flow measuring point two 5 is arranged between the first valve 4 and the mixer one 6, the vapor temperature measuring point 10 and the vapor pressure measuring point 11 are arranged on a second user 15 outlet main pipeline, the mixed vapor temperature measuring point one 17 and the mixed vapor pressure measuring point one 18 are arranged on a first mixer 6 outlet steam pipeline, and the mixed vapor temperature measuring point two 19 and the mixed vapor pressure measuring point two 20 are arranged on a second mixer 7 outlet steam pipeline.

The data obtained from the temperature, pressure and flow measurements are used to calculate the mass flow ratio to mixer one 6 and mixer two 7.

The liquid level monitoring device 14 is used for indirectly reflecting the heat exchange state in the first mixer 6 and the second mixer 7.

The system divides the hybrid evaporator into two parts, and realizes the control distribution of the flow of the mixed steam by measuring and processing the indirect signals, so that the mass flow of the two separated streams of steam is respectively equal to the mass flow of the liquid working medium and the vapor working medium before mixing.

The hybrid steam generation system is carried out according to the following method:

the liquid working medium at the outlet of the first user 9 is divided into two parts, one part enters the first mixer 6 under the control of the first valve 4, and the other part enters the second mixer 7 under the control of the fourth valve 16; meanwhile, the steam working medium at the outlet of the second user 15 is also divided into two parts, wherein one part enters the first mixer 6 under the control of the third valve 13, and the other part enters the second mixer 7 under the control of the second valve 12; the liquid working medium and the vapor working medium in the mixer I6 are mixed and heat-exchanged to form steam, then the steam completely enters the user I9, the liquid working medium and the vapor working medium in the mixer II 7 are mixed and heat-exchanged to form steam, and then the steam completely enters the user II 15; the flow distribution plate 8 is used for strengthening heat exchange between the liquid working medium and the vapor working medium, and the valve opening degrees of the second valve 12 and the third valve 13 are adjusted according to the indication of the liquid level monitoring device 14.

In order to realize that the mass flow rates of the inlet vaporous working medium and the outlet liquid working medium of the first user 9 are equal, and the mass flow rates of the inlet vaporous working medium and the outlet liquid working medium of the second user 15 are equal, the system operation also needs to use the following flow distribution method:

the data measured by the liquid temperature measuring point 1, the liquid pressure measuring point 2, the liquid flow measuring point I3, the liquid flow measuring point II 5, the vapor temperature measuring point 10, the vapor pressure measuring point 11, the mixed vapor temperature measuring point I17, the mixed vapor pressure measuring point I18, the mixed vapor temperature measuring point II 19 and the mixed vapor pressure measuring point II 20 are respectively measured by t_L、p_L、m_L、m_L,1、t_V、p_V、t₁、p₁、t₂And p₂Indicating that the mass flow of the vaporous working medium at the outlet of the second user 15 is unknown and is m_VExpressing that the thermodynamic specific enthalpy of the working medium is expressed by using a function h (t, p), and keeping t in the system operation process₁And t₂Equal, p₁And p₂If the liquid level detected by the liquid level monitoring device 14 is stable, the flow rate ratio of the working medium to the mixer I6 is,

h(t_L,p_L)·m_L+h(t_V,p_V)·m_V＝(m_L+m_V)·h(t₁,p₁)

a first liquid flow measuring point 3 is arranged at an outlet of a first user 9, a second liquid flow measuring point 5 is arranged between the first valve 4 and the first mixer 6, and m is ensured by monitoring the flow and adjusting the opening degree of the first valve 4 and the fourth valve 16_L,1And m_LThe ratio of the mass flow rate of the inlet and the outlet of the first user 9 and the mass flow rate of the inlet and the outlet of the second user 15 are equal to each other by conforming to the calculation formula.

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

the invention discloses a hybrid steam generation system and a flow distribution method, and provides a hybrid evaporation heat exchange system with engineering operability and a corresponding flow distribution control method.

Drawings

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

In the figure: 1-liquid temperature measuring point 2-liquid pressure measuring point 3-liquid flow measuring point one 4-first valve 5-liquid flow measuring point two 6-mixer one 7-mixer two 8-flow divider 9-user one 10-vapor temperature measuring point 11-vapor pressure measuring point 12-second valve 13-third valve 14-liquid level monitoring device 15-user two 16-fourth valve mixed vapor temperature measuring point one 17-mixed vapor pressure measuring point one 18-mixed vapor temperature measuring point two 19-mixed vapor pressure measuring point two 20.

Detailed Description

The invention will be described in further detail with reference to the following drawings and specific embodiments, which are described herein for purposes of illustration only and are not intended to be limiting.

As shown in figure 1, the hybrid steam generating system comprises a liquid temperature measuring point 1, a liquid pressure measuring point 2, a liquid flow measuring point I3, a first valve 4, a liquid flow measuring point II 5, a mixer I6, a mixer II 7, a flow distribution plate 8, a user I9, a steam temperature measuring point 10, a steam pressure measuring point 11, a second valve 12, a third valve 13, a liquid level monitoring device 14, a user II 15, a fourth valve 16, a mixed steam temperature measuring point I17, a mixed steam pressure measuring point I18, a mixed steam temperature measuring point II 19 and a mixed steam pressure measuring point II 20.

The phase state of the working medium at the outlet of the first user 9 is liquid, the liquid working medium is divided into two paths, one path is connected with the liquid inlet of the first mixer 6 through the first valve 4, and the other path is connected with the liquid inlet of the second mixer 7 through the fourth valve 16; the phase state of the working medium at the outlet of the second user 15 is a vapor state, the vapor working medium is divided into two paths, one path is connected with the vapor inlet of the second mixer 7 through a second valve 12, and the other path is connected with the vapor inlet of the first mixer 6 through a third valve 13; a flow distribution plate 8 is arranged at the upper parts in the first mixer 6 and the second mixer 7 close to the liquid inlet, liquid level monitoring devices 14 are arranged at the lower parts in the first mixer 6 and the second mixer 7, a steam outlet of the first mixer 6 is connected with an inlet 9 of a first user, and a steam outlet of the second mixer 7 is connected with an inlet 15 of a second user; the liquid temperature measuring point 1, the liquid pressure measuring point 2 and the liquid flow measuring point 3 are arranged on a first user 9 outlet main pipeline, the liquid flow measuring point two 5 is arranged between the first valve 4 and the mixer one 6, the vapor temperature measuring point 10 and the vapor pressure measuring point 11 are arranged on a second user 15 outlet main pipeline, the mixed vapor temperature measuring point one 17 and the mixed vapor pressure measuring point one 18 are arranged on a first mixer 6 outlet steam pipeline, and the mixed vapor temperature measuring point two 19 and the mixed vapor pressure measuring point two 20 are arranged on a second mixer 7 outlet steam pipeline.

The hybrid steam generation system performs flow distribution according to the following method:

the liquid working medium at the outlet of the first user 9 is divided into two parts, one part enters the first mixer 6 under the control of the first valve 4, and the other part enters the second mixer 7 under the control of the fourth valve 16; meanwhile, the steam working medium at the outlet of the second user 15 is also divided into two parts, wherein one part enters the first mixer 6 under the control of the third valve 13, and the other part enters the second mixer 7 under the control of the second valve 12; the liquid working medium and the vapor working medium in the mixer I6 are mixed and heat-exchanged to form steam, then the steam completely enters the user I9, the liquid working medium and the vapor working medium in the mixer II 7 are mixed and heat-exchanged to form steam, and then the steam completely enters the user II 15; the flow distribution plate 8 is used for strengthening heat exchange between the liquid working medium and the vapor working medium, and the valve opening degrees of the second valve 12 and the third valve 13 are adjusted according to the indication of the liquid level monitoring device 14.

The first user 9 represents the thermodynamic process of the working medium converted from the steam state at the outlet of the first mixer 6 into the liquid state, the second user 15 represents the thermodynamic process of the working medium converted from the steam state at the outlet of the second mixer 7 into the other steam state, and the mass flow of the inlet and the outlet of the first user 9 and the second user 15 can maintain the stability of the whole system only when the mass flow is in the balance state, which is also a design difficulty of the hybrid steam generator. Although the steam flow is not easy to be accurately measured, the flow of the liquid working medium can be accurately measured according to the level of the current instrument, the invention converts the measurement of the steam flow into the measurement of the temperature, the pressure and the flow of the liquid working medium, and accurately controls the flow of the working medium returning to the first user 9 and the second user 15 by utilizing the heat balance principle.

While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the invention may be made by those skilled in the art within the spirit and scope of the invention. Any insubstantial modification of the invention using this concept is intended to be covered by the act of infringing the scope of the invention.