CN219199545U - High-pressure steam driven composite heat pump - Google Patents

Abstract

The utility model relates to the technical field of waste heat utilization, in particular to a high-pressure steam driven composite heat pump which comprises a high-pressure generator, a low-pressure generator, a condenser, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, an absorber, an evaporator and a steam ejector, wherein the high-pressure generator, the low-pressure generator, the condenser, the high-temperature solution heat exchanger, the low-temperature solution heat exchanger, the absorber and the evaporator form a classical double-effect first-type absorption heat pump, the steam ejector is arranged between the high-pressure generator and the low-pressure generator, a high-pressure steam pipeline and the high-pressure generator are communicated with an injection inlet of the steam ejector, and an outlet of the steam ejector is communicated with the low-pressure generator. By combining the two devices, the utility model respectively plays own advantages, realizes higher efficiency, and avoids the situations of low water outlet temperature of the double-effect heat pump, low efficiency of the single-effect heat pump and poor variable working condition capability of the injection heat pump.

Description

High-pressure steam driven composite heat pump

Technical Field

The utility model relates to the technical field of waste heat utilization, in particular to a high-pressure steam driven composite heat pump.

Background

In the field of heating by taking steam as a heat source, a huge heat exchange temperature difference exists between the steam and heat supply network water, and particularly, a project of heating by adopting high-pressure steam is adopted. The large heat exchange temperature difference can be used as a driving force for improving the temperature of waste heat. Therefore, in this case, an electrically driven compression heat pump is not suitable, and a vapor driven absorption heat pump can be used, and in terms of a relatively high heating vapor pressure, the single use of the absorption heat pump cannot fully utilize the driving capability of high pressure vapor.

The absorption heat pump comprises a single-effect heat pump and a double-effect heat pump, the double-effect heat pump is driven by high-pressure steam, the waste heat recovery efficiency is high, but the water outlet temperature of the heat supply network cannot be too high; the single-effect heat pump has low efficiency and high outlet water temperature, is more suitable for heat supply projects, but does not need very high-pressure steam, and the steam pressure is enough. Therefore, in a heating scene with high-pressure steam, the advantages of the high-pressure steam are not fully reflected.

Disclosure of Invention

The utility model aims to provide a high-pressure steam driven composite heat pump which can realize the function of efficiently recovering exhaust steam waste heat by utilizing high-pressure steam.

The utility model provides a high-pressure steam driven composite heat pump which comprises a high-pressure generator, a low-pressure generator, a condenser, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, an absorber, an evaporator and a steam ejector, wherein the high-pressure generator, the low-pressure generator, the condenser, the high-temperature solution heat exchanger, the low-temperature solution heat exchanger, the absorber and the evaporator form a classical double-effect first-class absorption heat pump, the steam ejector is arranged between the high-pressure generator and the low-pressure generator, a high-pressure steam pipeline and the high-pressure generator are communicated with an ejection inlet of the steam ejector, and an outlet of the steam ejector is communicated with the low-pressure generator.

Further, a water outlet pipe is arranged on the refrigerant water return pipeline of the evaporator, and a condensate pump is arranged on the water outlet pipe.

Further, a steam-water heat exchanger is further arranged, a steam discharge bypass is arranged on a pipeline between the steam ejector and the low-pressure generator, the steam-water heat exchanger is arranged on the steam discharge bypass, and heat supply network water is heated again after being discharged from the condenser and passes through the steam-water heat exchanger.

The beneficial effects are that:

by combining the two devices, the utility model respectively plays own advantages, realizes higher efficiency, and avoids the situations of low water outlet temperature of the double-effect heat pump, low efficiency of the single-effect heat pump and poor variable working condition capability of the injection heat pump.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the device connection of embodiment 1 of the present utility model;

FIG. 2 is a schematic diagram of the device connection according to embodiment 2 of the present utility model;

fig. 3 is a schematic diagram of the present utility model with respect to a double-effect first-type absorption heat pump.

Reference numerals illustrate: 1-high pressure generator, 2-low pressure generator, 3-condenser, 4-high temperature solution heat exchanger, 5-low temperature solution heat exchanger, 6-absorber, 7-evaporator, 8-steam ejector, 9-condensate pump and 10-steam-water heat exchanger.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model combines the injection type heat pump (namely the steam injector) and the absorption type heat pump, takes the respective advantages to carry out optimization combination, and realizes the function of efficiently recovering the exhaust steam waste heat by utilizing high-pressure steam. The injection heat pump has the advantages of simple structure, low manufacturing cost and poor variable working condition capability; the absorption heat pump has the advantages of strong variable working condition capability, low water outlet temperature of the double-effect absorption heat pump and low efficiency of the single-effect absorption heat pump. For the injection type heat pump, the higher the driving steam pressure is, the higher the efficiency of the injection type heat pump is, and the lower the consumed steam amount is. However, in the heat supply field, the water outlet temperature of the heat supply network is high, and if the water outlet temperature of the injection heat pump is increased, the efficiency is rapidly reduced; meanwhile, the variable working condition capability of the injection heat pump is poor, and the injection heat pump is not suitable for large-scale adjustment. Therefore, the injection heat pump is suitable for bearing stable base load, and meanwhile, a large amount of high-temperature load needs to be directly heated by steam to recover waste heat, so that the overall efficiency is not high.

The utility model takes a classical double-effect first-class absorption heat pump structure as a main part. The structure of the double-effect first-type absorption heat pump is shown in figure 1. The high-pressure steam enters a high-pressure generator to generate a concentrated solution with higher temperature and saturated steam with higher pressure, the saturated steam enters a low-pressure generator again, the lithium bromide solution is continuously heated, and the saturated steam enters a condenser after being condensed; the low-pressure steam generated by the low-pressure generator enters a condenser heating heat supply network to be condensed, and the condensed water and the steam condensed water of the high-pressure generator are mixed together and then enter an evaporator to be evaporated through a throttling device; the evaporator is low in pressure, water evaporates at low temperature, absorbs heat of external waste heat to generate water vapor, the water vapor enters the condenser and is absorbed by concentrated solution generated by the two generators, and the absorption process releases heat to heat water of a heat supply network; in the absorber, the concentrated solution absorbs vapor to form a dilute solution, and then the dilute solution enters the high-pressure generator and the low-pressure generator after passing through the waste heat of the solution heat exchanger to be heated and concentrated into the concentrated solution. Because the double-effect absorption heat pump is provided with two generators, the solution flow has a plurality of forms of parallel connection, serial-parallel connection and the like, and the solution flow belongs to the conventional flow and is not described in detail in the utility model.

The double-effect absorption type utilizes the high-grade energy of high-pressure steam, and realizes the effect of two-stage generation, so that the efficiency is higher. However, the corrosiveness of lithium bromide solution can be increased rapidly after the temperature exceeds 165 ℃, no matter how high the steam pressure is, the highest solution temperature of the high-pressure generator cannot exceed 165 ℃, and crystallization cannot be carried out at the same time, so that the saturated steam pressure generated by the high-pressure generator cannot be too high, the steam pressure generated by the low-pressure generator is too low, the condenser cannot heat the heat supply network water to a higher temperature, and the condenser is not applicable to the field of centralized heat supply of high-temperature water supply. The composite heat pump of the utility model adds the steam ejector in the flow of the conventional double-effect absorption heat pump, thereby improving the water outlet temperature of the heat supply network, realizing the effect of combined heat supply of the single-effect heat pump and the double-effect heat pump, having simpler structure and greatly reducing the manufacturing cost.

Example 1

The high-pressure steam enters the composite heat pump and is divided into two paths, one path enters the high-pressure generator 1 to heat the lithium bromide dilute solution, and condensate water is generated and returns to the condensate water system; the other path of the refrigerant steam enters a steam ejector 2 to eject the refrigerant steam generated by the high-pressure generator 1, and the refrigerant steam enters the low-pressure generator 2 to heat the dilute solution after the pressure is increased; the refrigerant steam generated by the low-pressure generator 2 enters a condenser 3 to be condensed into refrigerant water; the refrigerant water enters the evaporator 7 for internal circulation after passing through the throttling device, the heat is recovered by evaporation and heat absorption, the refrigerant steam is formed, and the redundant condensate is discharged by the condensate pump 9; the concentrated solution generated by the two generators enters an absorber 6 to absorb the refrigerant steam generated by an evaporator 7 to form a dilute solution, and then enters a high-pressure generator 1 and a low-pressure generator 2 to be regenerated through a high-temperature solution heat exchanger 4 and a low-temperature solution heat exchanger 5 to form a cycle.

Example 2

The difference from embodiment 1 is that the redundant steam generated by the steam ejector 8 does not enter the heat pump system any more, but is directly led out from the steam ejector 8, enters the steam-water heat exchanger 10, heats the hot water flowing out from the condenser 3, and further increases the water outlet temperature of the unit heat supply network. Therefore, the condensate pump 9 of the evaporator 7 is omitted, and the outlet branch of the steam ejector 8 and the steam-water heat exchanger 10 are added.

It should be noted that, in practical application, the absorption heat pump part has a multi-stage structure and other changes, so that the solution and the refrigerant loop may have various flows, which are all of a normal double-effect absorption heat pump structure.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (3)

1. The utility model provides a high-pressure steam driven composite heat pump which is characterized in that, includes high-pressure generator, low pressure generator, condenser, high temperature solution heat exchanger, low temperature solution heat exchanger, absorber, evaporimeter and steam ejector, wherein high pressure generator, low pressure generator, condenser, high temperature solution heat exchanger, low temperature solution heat exchanger, absorber, evaporimeter constitute classical double-effect first class absorption heat pump, the steam ejector is established high pressure generator with between the low pressure generator, high pressure steam pipeline with the high pressure generator with the injection entry of steam ejector communicates with each other, the export of steam ejector with the low pressure generator communicates with each other.

2. The high pressure steam driven composite heat pump of claim 1 wherein the evaporator has a water outlet pipe on the refrigerant water return line, and a condensate pump is provided on the water outlet pipe.

3. The high pressure steam driven composite heat pump of claim 1 further comprising a steam-water heat exchanger, wherein a steam exhaust bypass is provided on a line between the steam ejector and the low pressure generator, the steam-water heat exchanger is provided on the steam exhaust bypass, and the heat supply water is heated again after the condenser is exhausted through the steam-water heat exchanger.

Images