Heat pump external heating double effect concentrator

Three innovations in the standard of heat pump external heating double effect concentrator 1 Overall technical scheme 1 Technical principle of the project Double effect concentration is to heat and evaporate the extract of traditional Chinese medicine by steam under the vacuum condition in a closed container, and to heat and condense the second effect of traditional Chinese medicine by the second steam produced by the first effect, so that the steam can be used for the second time, so as to achieve the purpose of energy saving The self-developed thermal compressor thermal compressor is used to pump a part of the secondary steam produced in the first effect into the thermal compressor and mix it with the saturated steam through the reduced pressure and temperature boiler of the Laval nozzle of the thermal compressor After the thermal compressor pump body raises the temperature and pressure, it is used as the first effect heat source, further improving the energy-saving effect of the project products The self-developed constant pressure drainage cascade self evaporation device reduces the temperature of saturated condensate from 90 ℃ to 75 ℃ under the next effect of pressure reduction The self evaporating steam is used as the heat source of this effect, further achieving the purpose of steam saving, and can generate flash steam accounting for 3% of the condensed water as the second effect heat source Due to the adoption of these two energy-saving measures, the energy-saving and water-saving of the products of this project are respectively over 30% compared with the common Chinese medicine double effect concentrator used in the traditional Chinese medicine factory under the same evaporation capacity The developed thermal compressor adopts the double-layer compound expansion chamber type silencing technology, which effectively eliminates the high frequency and medium frequency waves, and has a silencing hole on the cylinder wall, so that the noise can be reduced to 75db (a), which is at the first level of Ling at home and abroad 2 Main technical and performance indexes 1 Steam pressure of thermal compressor, MPA 0.5-0.6 Working noise, dB (A) ≤ 782 theoretical evaporation capacity kg/h 500 1000 1500 2000 2500 3000 3 steam consumption kg / h 175 350 525 700 875 1050 4 Cooling water consumption (inlet water temperature 25 ℃ outlet water temperature 35 ℃) t / h 12 24 36 48 60 72 5 * effective shell side vacuum degree MPa 0.04 ~ 0.03 6 Heating steam temperature ℃ 85 ~ 90 7 vacuum degree of evaporation chamber MPa 0.068 ~ 0.060 8 boiling point ℃ 70 ~ 759 vacuum degree of the second effect shell side MPA 0.068 ~ 0.060 10 heating steam temperature ℃ 70 ~ 75 11 vacuum degree of evaporation chamber MPa 0.089 ~ 0.082 12 boiling point ℃ 52-57.3 Type and name of quality standard for project implementation The standard is modified according to the enterprise standard Q / z02-2004 "double effect Chinese medicine series concentration device with thermal compressor" Suffer Entrusted by China Pharmaceutical Equipment Industry Association, our company is the drafting unit of national pharmaceutical machinery industry standard "heat pump external heating double effect concentrator" The national development and Reform Commission has announced the implementation of "heat pump external heating double effect concentrator" on December 1, 2006 From December 1, 2006, the project products shall comply with the standard Through the implementation of the project, the newly obtained relevant certificates of the enterprise quality certification system certificate of det Norske Veritas ISO9001:2000 standard national relevant industry license Manufacturing license of class I and class II pressure vessel: one external circulation multi effect concentration system, one thermal compressor technology, product identification certificate Zhejiang high tech products, Zhejiang high tech enterprises, project innovation content, innovation point 1: in the double effect evaporation and concentration process of traditional Chinese medicine extract, the self-developed low-noise high-pressure extraction steam thermal compressor is adopted, which significantly saves energy and water The product of the project is a double effect evaporation production equipment with a thermal compressor for extracting liquid of traditional Chinese medicine (see Fig 1 and Fig 2) Refer to Fig 3 and Fig 4 for the traditional double effect evaporation and concentration production equipment and process The product of the project adopts the self-developed low-noise thermal compressor (also known as hot pressure pump), which is the key component to obtain steam saving, and its structure is shown in Figure 5 Its working principle is that after passing the high-pressure steam (usually 0.55-0.7mpa) through the Laval nozzle, it flows out at supersonic speed, forming a low pressure at the nozzle; at the same time, because the steam flows absolutely in the nozzle, the temperature of the high-pressure steam is also reduced, from the original high-temperature and high-pressure steam through the nozzle to low-temperature and low-pressure (or negative pressure) steam The nozzle of the thermal compressor is negative pressure, which is the same as the pressure of the first effect evaporation chamber Therefore, the secondary steam of the first effect part is sucked into the nozzle negative pressure and mixed with the negative pressure low-temperature steam here, which is collectively referred to as mixed steam The mixed steam enters the mixing section of the pump body The supersonic steam from the Laval nozzle is mixed with the first effect part of the subsonic steam in this section for speed equalization When the mixed steam passes through the throat of the pump body, the speed equalization is completed, and it changes into subsonic Zui is used as an effective heat source after being boosted and heated through the expansion section of the pump body It can be seen that in addition to the original steam, a large number of secondary steam from the primary evaporation chamber is introduced into the thermal compressor as the heat source, which greatly reduces the amount of steam used for heating and achieves the effect of steam saving As the key part of the double effect concentration device, the thermal compressor has the advantages of simple structure, no moving parts, low manufacturing cost, but its disadvantage is that it is noisy at work The thermal compressor of the project product adopts the double-layer compound expansion chamber type silencing structure, which can eliminate the high-frequency wave and medium frequency wave of the supersonic air flow from the Laval nozzle and the high-frequency wave and medium frequency wave in the mixed steam According to the principle of expansion muffler, the mixing section, throat and expansion section of the pump body of the thermal compressor are designed as double-layer sleeve structure, and the sound absorption hole is arranged on the cylinder wall, so that the steam body passing through this section of the pipeline passes through the sleeve structure and then collides with the outer cylinder wall and returns to make the noise enter Step down The noise of the thermal compressor with this structure is 75.1db (a) measured by the environmental monitoring station of Heilongjiang Agricultural Reclamation Bureau when the pressure of high-pressure steam is 0.58mpa The noise level of imported thermal compressors is 84.5db (a) and that of domestic thermal compressors is above 90dB (a) The thermal compressor of the project product is at the leading level in noise reduction Figure 1 new double effect concentration device figure click here to view all news pictures Figure 2 new double effect process flow chart Figure 3 original double effect concentration device Figure 4 original double effect process flow chart 5 low noise thermal energy compressor diagram three effects of innovation point 1: 1 The evaporation capacity of each effect changes: the project product is double effect evaporation process with thermal energy compressor As a result of the use of a thermal compressor, according to the working steam pressure of the thermal compressor, the suction coefficient of the thermal compressor and the amount of secondary steam pumped into the effective heating steam are calculated According to this, the effective evaporation of the project product is 65% of the total evaporation, and the second effect evaporation is 35% of the total evaporation The evaporation capacity of the double effect concentrator is the same as that of the second effect concentrator, which is 50% of the total evaporation capacity As the evaporation process with thermal compressor is adopted for the project product, the evaporation capacity of the second effect is reduced to 30% compared with that of the ordinary double effect concentrator, and the cooling water used for cooling the final effect steam is reduced by 30% under the same inlet temperature and outlet temperature of the cooling water 2 The double effect evaporation process with thermal compressor is used in the project product, which greatly reduces the heating steam temperature Because only the steam supplied by the boiler is used, the heating temperature Zui of the ordinary double effect concentrator for traditional Chinese medicine is only as low as 105 ℃, because the heating steam is related to the shell side pressure of the heating chamber The temperature of the mixture of the boiler steam generated by the thermal energy compressor and the secondary steam of the efficiency part of the project product can be determined by the calculation of the structural dimension of the thermal energy compressor The temperature of the mixture of the project product is about 90 ℃, which is achieved