CN209415826U - A kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature water cooler - Google Patents

Abstract

A single-effect lithium bromide absorption low-temperature chiller with online density detection steam, the unit includes an evaporation temperature sensor (10), the driving heat source of the unit is steam with a pressure of 0.1MPa.G, the steam generator (1) is submerged, and the steam After condensing in the heat transfer tube of the steam generator (1), it flows out after being cooled by the condensate heat exchanger (9). The unit is equipped with an online detection device for refrigerant water density. The inner cylinder of agent water (14), the bottoms of the two cylinders are flush, and the upper part leaves a space for the vapor phase. The refrigerant water at the bottom of the outer cylinder enters the outer cylinder tube (11) with flow-restricting holes. The pipe (11) is connected, the top of the outer cylinder is connected to the refrigerant water balance pipe (16), and the lower part of the outer cylinder is provided with a refrigerant water pressure sensor (13). The device can automatically detect the refrigerant water density on-line, and then control the refrigerant water density within a safe range to improve the reliability of the unit.

Description

A single-effect lithium bromide absorption low-temperature chiller for on-line detection of density steam

technical field

The utility model relates to the technical field of air-conditioning equipment, in particular to a single-effect lithium bromide absorption low-temperature chiller for on-line detection of density steam.

Background technique

Ordinary steam single-effect lithium bromide absorption chillers, as shown in Figure 1, produce cold water above 7°C for air-conditioning users or production processes. The safe value of the refrigerant water temperature in the internal circulation of this type of unit is generally controlled above 3°C. And when the cooling capacity is found to be insufficient during the first commissioning or operation of the unit, it is necessary to detect the refrigerant water density. The detection of refrigerant water density usually adopts the method of manual sampling. Use a densitometer to measure the scale and read the data. Once the refrigerant water density is found to be greater than 1.04g/ml, it is regarded as refrigerant water pollution, that is, lithium bromide is mixed in the refrigerant water. solution, the refrigerant water needs to be regenerated by bypass, until the density of the refrigerant water is less than 1.002g/ml, the refrigerant water meets the requirements of the unit.

However, for the steam single-effect lithium bromide absorption low-temperature chiller that produces cold water at around 0°C, antifreeze is the key. Antifreeze can be added to the cold water of the external system to lower the freezing point of the water, and the temperature of the refrigerant water circulating inside the unit will be lower than that of the cold water. The cold water temperature of the external system is lower. In order to lower the freezing point of the refrigerant water, the method of adding lithium bromide solution to the refrigerant water is often used, and the content of the lithium bromide solution in the refrigerant water needs to be controlled within a certain range according to the temperature of the refrigerant water. If the refrigerant water Too much density will affect the cooling capacity, and if the refrigerant water density is too small, there will be a risk of freezing. Therefore, the steam single-effect lithium bromide absorption low-temperature chiller needs to automatically detect the refrigerant water density online in real time during operation. How to automatically detect the refrigerant water density on-line in real time, improve safety and reliability, keep the unit in the best operating state, and save unit cost has become one of the important topics in the research of steam single-effect lithium bromide absorption low-temperature chillers.

Utility model content

The purpose of this utility model is to solve the problems raised in the above-mentioned background problems, and provide a low-cost on-line detection density steam single-effect lithium bromide absorption low-temperature chiller that can keep the unit in the best operating state.

The purpose of this utility model is achieved in the following way: a single-effect lithium bromide absorption low-temperature water chiller for online detection of density steam, including a steam generator, a condenser, an evaporator, an absorber, a solution heat exchanger, a condensate heat exchanger, Dilute solution bypass valve and evaporation temperature sensor, etc., the driving heat source of the unit is steam with a pressure of 0.1MPa.G, the steam generator is submerged, and the steam flows out after being condensed in the heat transfer tube of the steam generator after being cooled by the condensate heat exchanger , the unit is equipped with an on-line detection device for refrigerant water density, and the on-line detection device for refrigerant water density includes a refrigerant water return capsule tube, a refrigerant water inlet outer cylinder tube, a refrigerant water pressure sensor, and a refrigerant water inner cylinder , Refrigerant water outer cylinder, refrigerant water balance pipe and control system, etc. There is a refrigerant water inner cylinder inside the refrigerant water outer cylinder, the bottom part of the refrigerant water outer cylinder and the refrigerant water inner cylinder are flush, and there is a vapor phase space in the upper part, and the refrigerant water enters from the bottom of the refrigerant water outer cylinder The outer cylinder tube is provided with flow limiting holes, the bottom of the refrigerant water inner cylinder is connected to the refrigerant water return bladder tube, the top of the refrigerant water outer cylinder is connected to the refrigerant water balance pipe, and the refrigerant water pressure is set at the lower part of the refrigerant water outer cylinder sensor. The evaporation temperature measured by the evaporation temperature sensor corresponds to the evaporation pressure.

The device also includes an evaporation pressure sensor, and the evaporation pressure sensor is arranged on the top of the refrigerant water outer cylinder or in the vapor phase area of the evaporator cylinder. The evaporation pressure is measured directly.

The lithium bromide absorption low-temperature chiller is a cascade type.

The cooling water is connected in series.

The cooling water is connected in parallel.

This device leads a path of refrigerant water from the outlet pipe of the refrigerant pump to the bottom of the outer cylinder of refrigerant water through the inlet pipe of the refrigerant water, and the refrigerant water in the outer cylinder overflows into the inner cylinder of refrigerant water, and then the liquid level The refrigerant water returns to the liquid bag pipe and flows into the evaporator liquid bag, and the cycle continues according to this process. The liquid level height of the coolant water in the outer cylinder is a fixed value, the change of the density of the coolant water causes the pressure measured by the pressure sensor to change accordingly, and the change of the outlet temperature of the cold water causes the evaporating pressure measured by the evaporating pressure sensor to change accordingly (or the evaporating temperature sensor The measured evaporating temperature corresponds to the change of the evaporating pressure), the measured refrigerant water pressure minus the evaporating pressure is equal to the online detection of the refrigerant water pressure difference, and the refrigerant water pressure difference corresponds to the refrigerant water density. The calculation formula and The corresponding relationship is entered into the control program, and the unit's own touch screen directly displays the refrigerant water density, and the dilute solution bypass valve is adjusted according to the refrigerant water density to control the refrigerant water density within a safe range.

The beneficial effects of the utility model are:

The utility model realizes automatic online detection of refrigerant water density through the above-mentioned refrigerant water density on-line detection device, and adjusts the solution bypass valve according to the refrigerant water density to control the refrigerant water density within a safe range, so that the unit is in the best operating state, Moreover, the cost of the on-line detection device for refrigerant water density is far lower than that of "on-line density meters" sold in the market, and has high measurement accuracy and good vacuum tightness. The on-line detection device for refrigerant water density can reduce the overall cost of steam single-effect lithium bromide absorption low-temperature chillers, improve safety and reliability, solve the key problem of antifreeze, extend the product line of lithium bromide absorption chillers, and expand the application field .

Description of drawings

Figure 1 is a schematic structural view of a common steam single-effect lithium bromide absorption low-temperature chiller.

Fig. 2 is a schematic structural diagram of a single-effect lithium bromide absorption low-temperature water chiller of the utility model for on-line detection of density steam in another embodiment.

Fig. 3 is a structural schematic diagram of a single-effect lithium bromide absorption low-temperature water chiller for on-line detection of density steam in another embodiment of the present invention.

Fig. 4 is a structural schematic diagram of a single-effect lithium bromide absorption low-temperature chiller of the utility model with on-line detection of density steam.

In the picture:

Steam generator 1, condenser 2, evaporator 3, absorber 4, solution heat exchanger 5, condensation water heat exchanger 9, solution pump 6, refrigerant pump 7, dilute solution bypass valve 8, evaporation temperature sensor 10 , refrigerant water return bladder tube 11, refrigerant water inlet outer cylinder tube 12, refrigerant water pressure sensor 13, refrigerant water inner cylinder 14, refrigerant water outer cylinder 15, refrigerant water balance pipe 16, evaporation pressure sensor 17. Cooling water inlet A, cooling water outlet B, steam inlet C, steam condensate outlet D, low-temperature cold water inlet E, and low-temperature cold water outlet F.

Detailed ways

The utility model is described below in conjunction with accompanying drawing and specific embodiment:

Example 1:

As shown in Figure 2, a single-effect lithium bromide absorption low-temperature water chiller with on-line density detection steam includes a steam generator 1, a condenser 2, an evaporator 3, an absorber 4, a solution heat exchanger 5, and a condensate exchanger. Heater 9, solution pump 6, refrigerant pump 7, dilute solution bypass valve 8 and evaporation temperature sensor 10, characterized in that: the driving heat source of the unit is steam with a pressure of 0.1MPa.G, and the steam generator 1 is submerged, After the steam condenses in the heat transfer tube of the steam generator 1, it flows out after being cooled by the condensate heat exchanger 9. The unit is equipped with an on-line detection device for refrigerant water density. 11. Coolant water inlet outer tube 12, coolant water pressure sensor 13, coolant water inner tube 14, coolant water outer tube 15, coolant water balance tube 16, evaporation pressure sensor 17 and control system. A refrigerant water inner cylinder 14 is arranged in the refrigerant water outer cylinder 15. The bottoms of the two cylinders are flush and there is a vapor phase space at the upper part. A flow-limiting hole is provided at the bottom of the outer cylinder where the refrigerant water enters the outer cylinder tube 12. The bottom of the inner cylinder is in contact with The refrigerant water return bladder pipe 11 is connected, the top of the outer cylinder is connected with the refrigerant water balance pipe 16, the refrigerant water pressure sensor 13 is arranged at the lower part of the outer cylinder, and the evaporation pressure sensor 17 is arranged at the top of the outer cylinder.

In the above scheme, the steam single-effect lithium bromide absorption low-temperature chiller is a cascade type.

In the above scheme, the cooling water is connected in series or in parallel.

Example 2:

As shown in FIG. 3 , in another embodiment, the evaporation pressure sensor 17 is arranged in the vapor phase area of the evaporator cylinder.

Example 3:

As shown in FIG. 4 , in another embodiment, the evaporation pressure sensor 17 is not provided, and the evaporation temperature measured by the evaporation temperature sensor 10 corresponds to the evaporation pressure.

The device leads a path of refrigerant water from the outlet pipe of the refrigerant pump 7 to enter the bottom of the refrigerant water outer cylinder through the refrigerant water inlet outer cylinder pipe 12, and the refrigerant water in the outer cylinder overflows into the refrigerant water inner cylinder 14, and then The liquid level difference flows into the liquid bag of the evaporator through the refrigerant water return liquid bag pipe 11, and circulates continuously. The liquid level height of the coolant water in the outer cylinder is a fixed value, the density change of the coolant water causes the pressure of the coolant water measured by the coolant water pressure sensor 13 to change accordingly, and the change of the outlet temperature of the cold water causes the pressure of the coolant water measured by the evaporation pressure sensor 17 to evaporate. The pressure changes accordingly (or the evaporation temperature measured by the evaporation temperature sensor 10 corresponds to the corresponding change of the evaporation pressure), the measured refrigerant water pressure minus the evaporation pressure is equal to the online detection of the refrigerant water pressure difference, and the refrigerant water pressure difference corresponds to Refrigerant water density, input the calculation formula (and the corresponding relationship between evaporating temperature and evaporating pressure) and the corresponding relationship between refrigerant water pressure difference and refrigerant water density into the control program, and the touch screen of the unit itself will directly display the refrigerant water density. The dilute solution bypass valve 8 for adjusting the density of refrigerant water controls the density of refrigerant water within a safe range.

In addition to the above-mentioned embodiments, the utility model also includes other implementation modes, and any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the utility model.

Claims (5)

1. a kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature water cooler, including it is steam generator (1), cold Condenser (2), evaporator (3), absorber (4), solution heat exchanger (5), condensate heat exchanger (9), solution pump (6), cryogenic fluid pump (7), weak solution by-passing valve (8) and evaporating temperature sensor (10), it is characterised in that: the unit driving heat source is pressure 0.1MPa.G steam, the steam generator (1) are immersion, and steam is in steam generator (1) heat-transfer pipe through solidifying after condensation Unit is flowed out after water- to-water heat exchanger (9) cooling, which is also additionally arranged water as refrigerant denseness on-line detection device, the cryogen water density On-line measuring device includes that water as refrigerant returns liquid capsule pipe (11), water as refrigerant into outer bobbin (12), cryogen water pressure sensor (13), cold Agent water inner cylinder (14), water as refrigerant outer cylinder (15), water as refrigerant balance pipe (16) and control system, the water as refrigerant outer cylinder (15) is interior to be set Be equipped with water as refrigerant inner cylinder (14), the cylinder bottom flush with portions of the water as refrigerant outer cylinder (15) and water as refrigerant inner cylinder (14), top there are Vapor phase space, water as refrigerant outer cylinder (15) bottom water as refrigerant, which enters, is equipped with metering hole at outer bobbin (12), in the water as refrigerant Cylinder (14) bottom is gone back to liquid capsule pipe (11) with water as refrigerant and is connect, at the top of the water as refrigerant outer cylinder (15) even with water as refrigerant balance pipe (16) It connects, cryogen water pressure sensor (13) are arranged in water as refrigerant outer cylinder (15) lower part.

2. a kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature water cooler according to claim 1, It is characterized by: described device further includes evaporating pressure sensor (17), the evaporating pressure sensor (17) is arranged in cryogen At the top of water outer cylinder (15) or evaporator tube vapour phase area.

3. a kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature cooling-water machine according to claim 1 or 2 Group, it is characterised in that: the steam single-effect lithiumbromide absorption type low-temperature water cooler is overlapping type suction-type lithium bromide low temperature Water cooler.

4. a kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature cooling-water machine according to claim 1 or 2 Group, it is characterised in that: the cooling water of steam single-effect lithiumbromide absorption type low-temperature water cooler is series connection.

5. a kind of on-line checking density steam single-effect lithiumbromide absorption type low-temperature cooling-water machine according to claim 1 or 2 Group, it is characterised in that: the cooling water of steam single-effect lithiumbromide absorption type low-temperature water cooler is in parallel.