CN215352010U

CN215352010U - Novel mechanical compression type heat pump evaporation salt making system

Info

Publication number: CN215352010U
Application number: CN202121594076.3U
Authority: CN
Inventors: 赖小平; 杨立树; 朱凯; 李威烨
Original assignee: Jiangxi 92 Salt Industry Co ltd
Current assignee: Jiangxi 92 Salt Industry Co ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-12-31
Anticipated expiration: 2031-07-14

Abstract

The utility model discloses a novel mechanical compression type heat pump evaporation salt production system, which comprises an evaporator, a gas washing tower, a condensate water balance barrel, a compressor, a brine circulating pipeline, a circulating pump, a preheater, a secondary steam conveying pipe, a steam balance pipe and a secondary steam return pipe, and is characterized in that: and a condensed water inlet is formed below the wire mesh module of the gas washing tower, a water outlet of the condensed water balance barrel is connected with the condensed water inlet through a condensed water pipe, and a condensed water pump is arranged on the condensed water pipe. The utility model directly connects the condensed water balance barrel to the gas washing tower, saves the condensed water flash barrel, simplifies the evaporation process flow, reduces the occupied area of system equipment, and saves the equipment investment and the production running cost.

Description

Novel mechanical compression type heat pump evaporation salt making system

Technical Field

The utility model belongs to the technical field of salt making equipment, and particularly relates to a novel mechanical compression type heat pump evaporation salt making system.

Background

The prior salt-making process in China mainly comprises two modes, namely multi-effect vacuum evaporation (ME) and mechanical compression type heat pump evaporation (MVR). The mechanical compression heat pump absorbs heat from low temperature and releases heat from high temperature by using heat-carrying working medium, and is a heat supply system which saves primary energy in the world at present. During multi-effect evaporation, secondary steam generated in the last effect contains a large amount of heat, but cannot be utilized due to low temperature, so that a large amount of cooling water is consumed for condensation, and the improvement of the heat efficiency is limited. The heat pump boosts and heats low-temperature secondary steam through mechanical compression and recycles the low-temperature secondary steam, so that the defect that a large amount of heat energy of final-effect secondary steam cannot be utilized is overcome, the comprehensive energy consumption is extremely low, and the primary energy utilization rate of the optimized mechanical compression type heat pump is higher than that of eight-effect evaporation. Therefore, the MVR method salt making is an energy-saving and clean salt making technology, the steam type compressor is used for converting electric energy into internal energy of secondary steam generated in the evaporation process, and the internal energy of the secondary steam is used as a heat source for evaporation heat exchange after enthalpy of the secondary steam is improved. Compared with multiple-effect vacuum salt production, MVR salt production has the advantages of high steam utilization rate, less matched equipment, small occupied area, large capacity of single equipment, simple process operation, small discharge amount of three wastes and the like, and is widely applied to the industries of evaporative concentration, evaporative crystallization and the like.

As shown in fig. 1, in the prior art, the MVR mainly comprises an evaporator, a compressor, a scrubber, a condensate water balance bucket, a condensate water flash bucket, and the like, and the working process thereof is as follows: after secondary steam generated by the evaporator is washed by the gas washing tower, the pressure and the saturation temperature of the secondary steam are improved through adiabatic compression of the compressor, the secondary steam is used as a heat source of the heating chamber to exchange heat for feed liquid in the evaporator and raise the temperature, the evaporated secondary steam enters the gas washing tower again, and a circulation process is formed; after the phase change heat exchange and condensation of the steam, the steam flows into a condensate water balance barrel to flash out steam, and the steam is merged into the compressed secondary steam; on one hand, steam (the pressure ratio is less than or equal to 1.95, and the temperature difference is 8-20 ℃) is flashed from the condensed water flash barrel and enters a compressor along with secondary steam, so that the enthalpy of the steam is improved, and the steam participates in heat exchange of a heating chamber of an evaporator; on the other hand, the flashed water participates in the circulation of the water washing water, or is directly pumped to the preheater through a condensate pump to preheat the brine entering the evaporator, and the heat energy is recovered.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model provides a novel mechanical compression type heat pump evaporation salt production system, which directly connects a condensed water balance barrel to a gas washing tower, saves a condensed water flash barrel, simplifies the evaporation process flow, reduces the occupied area of system equipment, and saves the equipment investment and the production operation cost.

The utility model is realized by the following technical scheme.

Novel mechanical compression heat pump evaporation salt manufacturing system, which comprises an evaporator, the scrubbing tower, the balanced bucket of comdenstion water, set up in the compressor of secondary steam conveyer pipe front end, the brine circulating line of being connected with the evaporimeter, set up the circulating pump on the brine circulating line, set up the pre-heater on the brine circulating line, connect the secondary steam conveyer pipe between pre-heater air inlet and scrubbing tower gas outlet, connect in the steam balance pipe at condensation water balance bucket gas outlet and secondary steam conveyer pipe end, connect the secondary steam back flow between evaporimeter gas outlet and scrubbing tower air inlet, its characterized in that:

and a condensed water inlet is formed below the wire mesh module of the gas washing tower, a water outlet of the condensed water balance barrel is connected with the condensed water inlet through a condensed water pipe, and a condensed water pump is arranged on the condensed water pipe.

As a specific technical scheme, a scrubbing circulating water outlet is formed in the bottom of the scrubbing tower; and the gas washing circulating water outlet is connected with a spraying water port arranged at the upper part of the gas washing tower through a gas washing circulating water pipe.

As a specific technical scheme, a washing gas circulating water pump is arranged on the washing gas circulating water pipe.

As a specific technical scheme, a washing steam water waste heat recycling pipe is connected between the washing steam circulating water pipe and the preheater.

The utility model has the following beneficial effects:

according to the utility model, the condensed water inlet is additionally arranged below the silk screen module, and the water outlet of the condensed water balance barrel is directly connected with the condensed water inlet through the condensed water pipe, so that the condensed water can be directly pumped into the gas washing tower from the condensed water balance barrel, and the condensed water flash barrel in a conventional system is omitted, so that the occupied space of the whole set of equipment of the system is reduced, the evaporation process flow is simplified, and the equipment investment and the production running cost are saved; in addition, after entering the gas washing tower, the high-temperature condensed water in the condensed water balance barrel flashes a part of steam, and the part of steam enters the compressor along with secondary steam generated by the evaporator to increase pressure and temperature, so that the enthalpy of the steam is increased, and the steam participates in heat exchange of a heating chamber of the evaporator; on the other hand, the flashed water participates in the circulation of the washing steam water and is pumped to the preheater through the washing steam water waste heat recycling pipe to preheat the raw material liquid entering the evaporator, so that the heat of the washing steam water is recycled, and the energy and the production water are reasonably recycled.

Drawings

FIG. 1 is a schematic structural diagram of a mechanical compression type heat pump evaporation salt-making system in the prior art;

FIG. 2 is a schematic structural diagram of the mechanical compression type heat pump evaporation salt-making system of the utility model;

the meanings of the marks in the above figures are as follows: 1-evaporator, 2-gas washing tower, 201-wire mesh module, 202-condensate water inlet, 203-gas washing circulating water outlet, 204-spray water port, 205-gas washing circulating water pipe, 206-gas washing circulating water pump, 207-gas washing water waste heat recycling pipe, 3-condensate water balancing barrel, 301-condensate water pipe, 302-condensate water pump, 4-compressor, 5-brine circulating pipeline, 6-brine circulating pump, 7-preheater, 8-secondary steam conveying pipe, 9-steam balancing pipe, 10-secondary steam return pipe and 11-condensate water flash evaporation barrel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

A novel mechanical compression type heat pump evaporation salt production system, please refer to fig. 2, which comprises an evaporator 1, a gas washing tower 2, a condensed water balance barrel 3, a compressor 4 arranged at the front end of a secondary steam conveying pipe 8, a brine circulating pipe 5 connected with the evaporator 1, a brine circulating pump 6 arranged on the brine circulating pipe 5, a preheater 7 arranged on the brine circulating pipe 5, a secondary steam conveying pipe 8 connected between the air inlet of the preheater 7 and the air outlet of the gas washing tower 2, a steam balance pipe 9 connected between the air outlet of the condensed water balance barrel 3 and the tail end of the secondary steam conveying pipe 8, and a secondary steam return pipe 10 connected between the air outlet of the evaporator 1 and the air inlet of the gas washing tower 2; a condensed water inlet 202 is arranged below the wire mesh module 201 of the gas washing tower 2, a water outlet of the condensed water balance barrel 3 is connected with the condensed water inlet 202 through a condensed water pipe 301, and a condensed water pump 302 is arranged on the condensed water pipe 301;

in the embodiment, secondary steam generated in the evaporation process of the evaporator 1 still carries a small amount of liquid drops (5-10 microns) after passing through the baffle plate mist eliminator, and if the steam mixed with the liquid drops directly enters the compressor 4, huge impact and point corrosion are generated on an impeller (with the linear velocity of about 350 m/s) rotating at a high speed of the compressor 4, and the service life of the compressor is seriously influenced; therefore, in MVR evaporation concentration and evaporation crystallization engineering, the secondary steam washing is very important, a spraying water port 204 and a wire mesh module 201 are arranged in the gas washing tower 2, the washing water sprayed by the spraying water port 204 can wash out foams carried in the steam, the wire mesh module 201 can remove liquid drops of 3-5 microns, the impact on a high-speed rotating impeller of a compressor is reduced, the stable operation of the compressor is ensured, and the service life of the compressor is prolonged; the condensed water balance barrel 3 has the functions of draining water and blocking steam, so that water is prevented from being stored in the preheater 7, and the steam is prevented from being discharged without being condensed so as to waste heat; according to the utility model, the condensed water inlet 202 is additionally arranged below the silk screen module 201, and the water outlet of the condensed water balance barrel 3 is directly connected with the condensed water inlet 202 through the condensed water pipe 301, so that the condensed water can be directly pumped into the gas washing tower from the condensed water balance barrel, and a condensed water flash barrel in a conventional system is omitted; and, the temperature, pressure in the condensate water balance bucket 3 are higher than the scrubbing tower 2, after the high-temperature condensate water in the condensate water balance bucket 3 enters the scrubbing tower, because the pressure reduces instantaneously, make partial condensate water flash, the steam that the vaporization produces mixes with the secondary steam and enters the vapor compressor, also can regard as the heat source of preheater 7 after raising the temperature to promote the pressure.

Further, in a preferred embodiment, referring to fig. 2, the bottom of the scrubber tower 2 is provided with a scrubber circulating water outlet 203; the washing gas circulating water outlet 203 is connected with a spraying water port 204 arranged at the upper part of the washing gas tower 2 through a washing gas circulating water pipe 205; in the embodiment, the condensed water generated by the preheater 7 flows into the condensed water balance barrel 3 through the condensed water recycling pipe 303, then is pumped into the gas washing tower through the pump to flash steam and fill up the consumption of the washing steam, because the pressure difference (the pressure ratio is less than or equal to 1.95) and the temperature difference (8-20 ℃) exist at the inlet and the outlet of the compressor, part of steam can be flashed after the high-temperature condensed water enters the gas washing tower, the part of steam enters the compressor along with the secondary steam generated by the evaporator to be subjected to pressure increase and temperature rise, the heat enthalpy of the steam is increased, the steam participates in the heat exchange of the heating chamber of the evaporator, and the flashed water can participate in the circulation of the washing steam.

Further, in a preferred embodiment, referring to fig. 2, a washing water circulating pump 206 is disposed on the washing water circulating pipe 205.

Further, in a preferred embodiment, referring to fig. 2, a washing steam water waste heat recycling pipe 207 is connected between the washing gas circulating water pipe 205 and the preheater 7; in this embodiment, the condensed water in the condensed water balance barrel 3 is pumped into the scrubber tower for flash evaporation, and then is pumped into the preheater 7 together with the washing water through the washing water waste heat recycling pipe 207 to preheat the raw material liquid entering the evaporator, thereby recycling the heat of the washing water.

Claims

1. Novel mechanical compression type heat pump evaporation salt production system, which comprises an evaporator (1), a gas washing tower (2), a condensate water balance barrel (3), a compressor (4) arranged at the front end of a secondary steam conveying pipe (8), a brine circulating pipeline (5) connected with the evaporator (1), a brine circulating pump (6) arranged on the brine circulating pipeline (5), a preheater (7) arranged on the brine circulating pipeline (5), the secondary steam conveying pipe (8) connected between an air inlet of the preheater (7) and an air outlet of the gas washing tower (2), a steam balance pipe (9) connected between the air outlet of the condensate water balance barrel (3) and the tail end of the secondary steam conveying pipe (8), a secondary steam backflow pipe (10) connected between the air outlet of the evaporator (1) and the air inlet of the gas washing tower (2), and a condensate water recycling pipe (303) connected between the water outlet of the preheater (7) and the water inlet of the condensate water balance barrel (3), the method is characterized in that:

the utility model discloses a solar water heater, including gas washing tower (2), wire mesh module (201) below of gas washing tower (2) is provided with comdenstion water import (202), the delivery port of comdenstion water balance bucket (3) passes through condenser pipe (301) and is connected with comdenstion water import (202), be provided with condensate pump (302) on condenser pipe (301).

2. A novel mechanical compression type heat pump evaporation salt making system according to claim 1, wherein the bottom of the scrubber tower (2) is provided with a scrubber circulating water outlet (203); the washing gas circulating water outlet (203) is connected with a spraying water gap (204) arranged at the upper part of the washing gas tower (2) through a washing gas circulating water pipe (205).

3. A novel mechanical compression type heat pump evaporation salt making system according to claim 2, wherein a washing gas circulating water pump (206) is arranged on the washing gas circulating water pipe (205).

4. The novel mechanical compression type heat pump evaporation salt production system according to claim 2, wherein a washing steam water waste heat recycling pipe (207) is connected between the washing gas circulating water pipe (205) and the preheater (7).